CONCRETE

1. Scales for weighing aggregates and cement shall be accurate within ____ % throughout the range of use. Scales shall be inspected and sealed as often as the Engineer may deem necessary to assure their continued accuracy.

a) 1.0 % c) 0.5 % b) 1.5 % d) 2.0 %

2. When cement is placed in contact with the aggregate, batches may be rejected unless mixed within _____ hours of such contact. a) 1.5 hours c) 0.5 hours b) 2.0 hours d) 2.5 hours

3. When mixed at the site or in a central mixing plant, the mixing time shall not be less than ______ nor more than ____ unless mixer performance test prove adequate mixing of concrete in a shorter time period. a) 30 seconds nor more than 90 seconds b) 50 seconds nor more than 90 seconds c) 60 seconds nor more than 120 seconds d) 90 seconds nor more than 120 seconds

4. The flow of water shall be uniform and all water should be in the drum by the end of the first ____ seconds of the mixing period. a) 45 seconds c) 15 seconds b) 30 seconds d) 20 seconds

5. Concrete not place within ____ minutes from the time the ingredients were charged into the mixing drum shall be used. a) 120 minutes c) 60 minutes b) 150 minutes d) 90 minutes

6. When concrete is delivered in truck mixers, additional water may be added to the batch and additional mixing performed to increase the slump to meet the specified requirement if permitted by the Engineer, provided all these operation are performed within ____ after the initial mixing operation and the water and cement ratio is not exceeded. a) 30 minutes c) 45 minutes b) 15 minutes d) 60 minutes

7. The concrete samples should be stored in a moist conditioned temperature within the range of ____ until the time of test. a) 18* C to 24* C c) 14* C to 24* C b) 15* C to 18* C d) 18* C to 28* C

8. Cast in place concrete shall not be post – tensioned until at least ____ and until the compressive strength has reached the strength specified. a) 7 days c) 14 days b) 10 days d) 20 days

9. The specific gravity of Sodium Sulfate used in soundness test for aggregate should be with in the range of ____. a) 1.510 to 1.174 c) 1.051 to 1.154 b) 1.250 to 1.178 d) 1.058 to 1.184

10. The specific gravity magnesium sulfate solution used in soundness test for aggregate should be within the range of ____ . a) 1.280 to 1.408 c) 1.295 to 1.174 b) 1.180 to 1.308 d) 1.195 to 1.318

11. The solution used in the soundness test of aggregate shall be cooled to a temperature of 21 +or – 1* C and maintain at that temperature for at least _____. a) 24 hours c) 48 hours b) 36 hours d) 18 hours

12. A concrete core sample having a maximum height of less than _____ of its diameter before capping or height less than its diameter after capping shall not be tested. a) 93 % c) 95 % b) 94 % d) 96 %

13. In concrete acceptance, core will be considered adequate if the average strength of the cores is equal to what? a) 80% of specified strength & if no single core is less than 75% of specified strength b) 90% of specified strength & if no single core is less than 80% of specified strength c) 85% of specified strength & if no single core is less than 75% of specified strength

14. Batching tolerance for Sand and Aggregate is ____. a) 1 % c) 3 % b) 2 % d) 4 %

15. Between stage of curing, concrete shall not be exposed for more than how many hours? a) 24 hours c) ½ hour b) 3 hours d) 72 hours

16. As a Materials Engineer, what will you do with major honeycombed area that is considered as defective work? a) Plaster b) Payment of the concrete will be made an adjustment c) Removed and replaced at the expensed of the contractor

17. If the strength of control specimen does not meet the requirement and not feasible to obtain cores due to structural consideration, as a Materials Engineer what will be your decision?

a) Removed and replaced b) Area will not be paid c) Payment will be made at an adjusted price

18. After concrete has been placed, it is advisable to maintain fully welted and in position for how many hours? a) 14 hours c) 72 hours b) 24 hours d) 15 – 18 hours

19. The depth of the weakened joints must not be less than ____ and a width of ___. a) 40 mm & 6 mm c) 40 mm & 5 mm b) 50 mm & 5 mm d) 50 mm & 6 mm

20. Submission of sample for testing for cement is _____. a) 10 kg c) 15 kg b) 20 kg d) 40 kg

21. _______ is the rate of loading for concrete cylinder sample subject to compression test a) 20 - 40 psi/sec c) 15 – 40 psi/sec b) 20 - 50 psi/sec d) 15 – 40 psi/sec

22. What is the rate of loading for concrete beam tested for flexural stress? a) 110 – 150 psi/sec c) 125 – 175 psi/sec b) 115 – 150 psi/sec d) 130 - 175 psi/sec

23. In concrete sampling paste shall be of normal consistency of _____ when the rod settles to a point below the original surface in 30 secs. a) 10 +/- 1 mm c) 15 +/- 1mm b) 11 +/- 1 mm d) 20 +/- 1 mm

24. What is the temperature of a concrete sample? a) 10 – 15 * C c) 15 – 18* C b) 18 – 24 * C

25. What is the wash loss of fine aggregates in the no. 200 sieve? a) 1 % c) 3 % b) 2 % d) 4 %

26. In the absence of beam mold in site, cylinder mold is allowed by specification. What is the required strength? a) 2,500 psi c) 3,500 psi b) 3,000 psi d) 4,000 psi

27. ________ is the slump of workable concrete if vibrated. a) 10 – 20 mm c) 40 – 50 mm b) 10 – 40 mm d) 40 – 75 mm

28. A burnt product which is combined with gypsum and pulverized to form Portland Cement. a) Hydraulic cement c) Fly Ash b) Clinker d) Volcanic Ash

29. Percent passing loose for coarse aggregates when tested for clay lump is _____. a) 0.1 mass percent c) 0.8 mass percent b) 0.25 mass percent d) 1.0 mass percent

30. The allowable mass percent passing loose for PCCP coarse aggregates soft fragment is ____. a) 0.10 c) 3.5 b) 0.25 d) 1.00

31. Mass percent loose for fine aggregates when tested in Clay lumps is _____. a) 0.10 c) 0.80 b) 0.25 d) 1.0

32. _________ is a type of cement which shall be transferred to an elevated, air tight and weather proof bins storage. a) Portland Cement c) Bulk Cement b) Pozzolan Cemenr d) None of the above

33. Scales for weighing aggregates and cement shall be accurate within _____. a) 0.1% c) 0.5% b) 0.25% d) 1.9%

34. _____________ is an instrument used for rapid in – site measurement of the structural properties of existing road pavement. a) Pundit Ultra Sonic Concrete Tester b) Dynamic Core Penetrometer c) Falling Weight Deflectometer d) Core Test

35. When mixed at the site or a in central mixing plant, the mixing time shall not be less than ___ seconds nor more than ____ seconds unless mixer performance test prove adequate mixing of the concrete in a shorter time period.a) 50 sec and 90 sec c) 40 sec and 100 secb) 60 sec and 90 sec d) 50 sec and 100 sec

36. The batches shall be so charged into the drum that a portion of the mixing water shall enter in advance of the cement and aggregate. The flow of water shall be uniform and all water should be in the drum by the end of the ____ seconds of the mixing perioda) 12 seconds c) 15 secondsb) 16 seconds d) 20 seconds

37. The time elapsed from the time water is added to the mix until the concrete is deposited at the site shall not exceed ____ minutes when concrete is hauled in the truck.

a) 90 c) 100b) 120 d) 60

38. When concrete is delivered in truck mixers, additional water may be added to the batch and additional mixing performed to increase the slump to meet the specified requirement if permitted by the Engineer, provided all these operation are performed within ____ minutes after the initial mixing operation and the water and cement ratio is not exceededa) 50 c) 45b) 60 d) 120

39. Concrete not placed within ____ minutes from the time the ingredients were charge into the mixing drum should not be use.a) 120 c) 100b) 90 d) 30

40. The completed pavement shall be accepted on a lot basis. A lot shall be considered as ____ linear meter double lanea) 1000 c) 1500b) 100 d) 500

41. Each PCCP lot shall be divided into _5_ equal segment and one core will be obtained from each segment in accordance with AASHTO T24.a) 4 c) 5b) 6 d) 7

42. Cast in place concrete shall not be post-tensioned until at least _10_ days and until the compressive strength has reached the strength specifieda) 10 c) 14b) 7 d) 28

43. This is the characteristic generally used for calculation of the volume occupied by the aggregate in various mixture containing aggregates including Portland Cement concrete, bituminous concrete, and other mixtures that are proportioned or analyzed on an absolute volume basis: a) Bulk Specific Gravity c) Apparent Specific Gravityb) Dry Specific Gravity d) Wet Specific Gravity

44. It pertains to the relative density of the soil material making up the constituents particle not including the pore space within the particles that is accessible to water.a) Bulk Specific Gravity c) Apparent Specific Gravityb) Dry Specific Gravity d) Wet Specific Gravity

45. The pour point of concrete joint sealer shall be at least 11*C (20*F) lower than the safe heating temperature, which is the maximum temperature to which the material may be heated without exceeding the permitted flow.

a) 11 ºC c) 15 ºCb) 2 ºC d) 10 ºC

46. The penetration of concrete joint sealer, Hot Poured Elastic Type shall not exceed_90_a) 100 c) 80b) 45 d) 90

47. The bearing blocks of the compression machine should be at least _____ greater than the diameter of the specimen. a) 5% c) 3%b) 6% d) 2%

48. The bottom bearing block shall be at least _____ thick when new a) 2” c) 1”b) 4” d) 3”

49. The bottom bearing block shall be at least _______ thick after any resurfacing operations.a) 0.9” c) 1.0”b) 1.2” d) 0.8”

50. The concrete shall not be left exposed for more than ____ between stages of curing or during the curing period. a) 30 minutes c) 60 minutesb) 45 minutes d) 15 minutes

51. The number of specimen samples in testing concrete hollow block is _____. a) 6 pcs./20,000 units (3 for absorption test and 3 for strength test ) b) 4 pcs./20,000 units c) 8 pcs./20,000 units

52. Is it really necessary to cure concrete specimen? a) Yes c) No b) None of the two

53. The kind of test that determines the consistency of concrete is _____. a) Slump test c) Abrasion test b) Specific Gravity

54. What is the dimension of concrete cylindrical sample? a) 6” dia. And 12” high c) 8” dia. And 14 high b) 4” dia and 8” high

55. In the absence of concrete beam mold at the project site, are concrete cylindrical molds allowed by the specification to be used in sampler for item 311 – PCCP? a) Yes b) may be c) No

56. The minimum compressive strength for class A concrete is ________. a) 3,000 psi. ( 20.7 MN/sq. m ) b) 2,400 psi. ( 16.7 MN/sq. m. ) c) 5,000 psi. ( 37.7 MN/sq. m. )

57. A tie bar should be ______ a) deformed bar b) round bar c) flat bar

58. A dowel bar should be ____________. a) deformed bar b) round bar c) flat bar

59. The mortar for masonry shall consist of ________. a) one part Portland Cement and 2 parts of sand b) one part Portland Cement and 3 parts of sand c) one part Portland Cement and 4 parts of sand

60. Joint filler in concrete pavement is a __________. a) Blown Asphalt b) Hot asphalt c) Liquid asphalt

61. __________ is the type of cement to be used in the DPWH infrastructure project as indicated in the Blue Book. a) Portland Cement Type I b) Pozzolan Cement Portland Cement Type II

62. If the fine aggregates are subjected to five cycles of sodium sulfate soundness test, the weighted loss shall not exceed ___________ a) 10 mass percent b) 5 mass percent c) 3 mass percent

63. If the coarse aggregate are subjected to five cycles of sodium sulfate soundness test, the weighted loss shall not exceed____________. a) 12 mass percent b) 15 mass percent 10 mass percent

64. The design of concrete mix specified by the blue book is based on ________________. a) Absolute Volume Method b) Area Method c) American Method

65. The minimum flexural strength requirement of beam sample when tested by third point loading method is ____________. a) 3.5 Mpa b) 3.8 Mpa c) 4.0 Mpa

66. The minimum flexural strength requirement of beam sample when tested by midpoint method is ____________. a) 4.5 Mpa b) 3.5 Mpa c) 5.0 Mpa

67. ____________ are additives used in mixing concrete. a) sodium chloride b) admixtures c) curing agent

68. ____________ determines the consistency of concrete. a) Slump Test b) consolidation test c) viscosity

69. Equipment used in the consolidation of fresh concrete. a) jack hammer b) vibrator c) drilling machine

70. The prescribed forms to be used in concrete paving is called ____________ a) steel forms b) wooden c) combination of steel and wood

71. The initial setting time of Portland cement is not less than _________________. a) 30 min. b) 60 min. c) 90 min d) 45 min.

72. The standard sand used in testing the mortar strength of Portland cement is called __________. a) Ottawa Sand b) Beach Sand c) River Sand

73. The apparatus used in determining the fineness of Portland cement by air permeability is __________ . a) Blaine Air Permeability Apparatus b) Sieve No. 200 c) Gillmored) Vicat Apparatus

74. A mixture of cement and water is called ____________. a) cement paste b) mortar paste c) concrete paste

75. The apparatus used to determine the initial and final setting of cement in the laboratory is _________. a) Gillmore needles b) Bailey needle c) Vicat apparatus

76. What is the appearance of the molded cement paste which fails to meet the autoclave expansion.______________. a) crumble b) shiny c) changes color

77. The dimension of beam sample for paving concrete is ___________. a) 6” x 6” x 21” b) 6” x 6” x 24” c) 4” x 4” x218”

78. The critical number of days of curing concrete is ____________. a) first seven days b) first 10 days c) 28 days

79. The standard dimension of concrete cylindrical sample is ___________. a) 6” dia. and 12” tall b) 6” dia. and 6” tall c) 6” dia. and 8” tall

80. There are two layers in performing sampling of beam samples. How many number of blows are required per layer? a) 63 blows b) 75 blows c) 50 blows

81. The formula which determines the proportion of the mix which can meet the desired strength requirement of concrete is called____________. a) design of concrete mix b) Boyle’s Formula c) Bernouli’s Formula

82. The minimum testing requirement for every project is indicated in a duly approved________. a) Quality Control Program b) Program of Work c) Work Schedule

83. It is prescribed in each project based on estimated quantities and specifies the kind and number of test for each item of work. a) Minimum number of work b) Minimum Testing Requirement c) Work Schedule

84. There is 1 – Q of cement required for every _________________. a) 4,000 bags or fraction thereof b) 2,000 bags or fraction thereof c) 10,000 bags

85. How many set of beam samples taken for every 75 cu. m. of concrete poured per day? a) one ( 1 ) set b) two ( 2 ) sets c) three ( 3 ) sets

86. In a completed pavement, what is the minimum core samples required before payment is effected? (Assuming that the thickness is 23 cm. ) a) Five holes per km per lane b) One hole per 500m c) P.E. Certificate

87. For pipe culverts and storm drains, the minimum test is 1 – Pipe for every 50 pipes. What is the alternative requirement? a) 1 – set consisting of 3 concrete cylinder samples for not more than 25 pipes cast in the field and 1 – inspection report for each size for not more than 25 pipes cast in the field. b) inspection report is enough c) Mill Certificate

88. The minimum test requirement for water used in concrete for a questionable source is ______. a) P.E. Certificate b) 1 – Quality Test c) Inspection Report

89. Per our present Specification for Highways and Bridges including amendments, it is mandatory to open PCCP to traffic not later than ___________. a) 7 days after pouring b) 21 days after pouring c) 14 days after pouring d) 28 days after pouring

90. In casting reinforced concrete railings, the concrete used is _____________. a) Class A1 c) Class C1 b) Class A2 d) any of the preceding classes

91. The slump test on concrete is a measure ______________ a) strength c) consistency b) unit weight d) durability

92. The fineness modulus is highest of _________________. a) fine sand c) very coarse sand b) very fine sand d) coarse sand

93. If concrete is continuously moist cured, it will gain strength beyond 180 days. a) True c) it depends on curing temperature b) False

94. The quality of paying concrete is usually measured by its _____________. a) compressive c) flexural b) tensile d) bond strength

95. Generally speaking, batching of concrete aggregates by volume is preferable than weight. a) True c) False b) they are the same

96. If angular coarse aggregate is used in a concrete mix, it will require more ________________ a) water c) water and fine aggregates b) fine aggregates d) neither a and b

97. The most favorable period for curing concrete is ______________. a) during the first few days or week b) after 3 days c) after one week d) before 28 days

98. Lower water content ratio in concrete mixes improves ________________. a) strength c) water tightness b) durability d) all of the preceding

99. When concrete must be placed in a sloping surface, placing should start at the __________. a) bottom c) can be top or bottom b) top

100. The maximum percent abrasion loss allowed for concrete coarse aggregate is __________. a) 30% c) 45% b) 40% d) 50%

101. In casting of reinforced concrete pile, the concrete used is ____________. a) A1 c) C1 b) D d) C2

102. Rate of application for curing compound is _______________. a) 0.29 li/sq. m. c) 0.15 li/sq. m. b) 0.20 li/sq. m. d) 0.10 li/sq. m.

103. During coring of completed pavement, how many cores /km/lane is required as per specification? a) 4 c) 6 b) 5 d) 7

104. What is the correct proportion for concrete masonry work? a) 1: 2 c) 1: 4 b) 1: 3 d) 1 : 5

105. The opening of No. 4 sieve is bigger than the opening of a ¼ sieve. a) true b) false c) they are the same

106. The corrugation produce by brooming is _____________. a) 1.5 mm. c) 2.5 mm. b) 2.0 mm. d) 1.0 mm.

107. The required thickness of the thermoplastic paint in PCCP is ____0.33L/sq.m______. a) 3.2 to 4.8 mm. c) 3.3 to 3.8 mm. b) 3.0 to 4.5 mm. d) 3.2 to 4.0 mm

108. Quality of factor – produced reinforced concrete pipes may be best established through what? a) compressive strength test b) flexural strength test c) core test d) crushing strength test

109. As Materials Engineer, when is the right time to start sampling and testing of materials to be incorporated into the work? a) before final payment b) before start of work items c) before first partial payment

110. What is the basis for rejection or acceptance of any construction materials? a) Certificate of Billing c) Statement of work accomplished b) Materials Test Report d) none of the abcve

111. Problems regarding quality of construction materials shall be reported directly by the Contractor’s Materials Engineer to the ____________. a) DPWH Materials Engineer c) Contractor’s Project Engineer b) Contractor d) none of the above

112. How many concrete cylinder samples are required for 3,500 pcs. of reinforced concrete pipes? a) 14 sets of 3 c) 75 sets of 3 b) 140 sets of 3 d) none of the above

113. What method is used in determining the strength of concrete pipes? a) third point loading method b) center point loading method c) three edge bearing method

114. For 250 gallons of Reflectorized Traffic Paint, how many samples are required to be submitted for Quality Testing? a) 3 samples b) 2 samples c) 4 samples

115. Traffic paint shall be applied to the pavement at the rate of 0.33 li/sq. m. and shall dry sufficiently to be free it from cracking from ___________. a) 25 to 30 mins c) 20 to 25 minsb) 10 to 15 mins d) 15 to 30 mins

116. This is the only class of riprap that may consist of round natural stones. a) Class C Riprap c) Class D Riprapb) Class A Riprap d) Class E Riprap

117. The surface of riprap shall not vary from the theoretical surface by more than ______ mm at any point. a) 150 mm c) 200 mmb) 300 mm d) 100 mm

118. Fine aggregates of masonry shall all passes the ______ mm. sieve. a) 2.36 c) 19b) 0.595 d) 12.7

119. Mortar that is not used within ______ minutes after the water has been added shall be discarded. a) 60 minutes c) 30 minutesb) 100 minutes d) 90 minutes

120. Maximum projection of rock faces beyond the pitch lines shall not be more than _____. a) 50 mm. b) 60 mmb) 70 mm d) 100 mm

121. In hot or dry weather, the masonry shall be satisfactory protected from the sun and shall be kept wet for a period at least _________ after completion. a) 14 days c) 4 daysb) 7 days d) 3 days

122. For pavement markings, the composition of white paint shall be _______ pigment and ______% of vehicle a) 40 – 50 % pigment; 50 – 60% vehicle c) 45 – 55 % pigment; 55 – 60% vehicle

b) 42 – 45 % pigment; 53 – 55% vehicle d) 40 – 45 % pigment; 50 – 55% vehicle

123. The composition of yellow paint shall be _______ pigment and ______ vehicle. a) 40% pigment and 77% vehicle c) 23% pigment and 77% vehicle b) 29% pigment and 77% vehicle d) 26% pigment and 77% vehicle

124. The __________ material shall be of such quality that it will not darken or become yellow when a thin section is exposed to sunlight. a) non-volatile c) deleteriousb) coarse d) solvent

125. ___________ is a reflector which shall be the short base type having a maximum base area of 180 mm x 140 mm. a) Flash surface reflective stud c) Brinnellb) Traffic Cone d) Vicat

126. Expansion joint filler having a nominal thickness of less than ________ mm. shall not be subject to a requirement for water absorption. a) 10 mm c) 18 mmb) 15 mm d) 9.5 mm

127. Expansion joint filler having a nominal thickness of less than ________ mm. shall not be subject to a requirement for compaction. a) 15 mm c) 13 mmb) 20 mm d) 12 mm

128. Strip of the joint filler that do not conform to the specified dimension within the permissible variation of ______ mm. thickness ________ in depth shall be reflected. a) +/- 1.6 to – 0 thickness ; +/- 3mm. in depthb) +/- 1.9 to – 0 thickness ; +/- 3mm. in depthc) +/- 2.6 to – 0 thickness ; +/- 3mm. in depthd) +/- 3.6 to – 0 thickness ; +/- 3mm. in depth

129. These are finely divided residue that result from the combustion of ground or powdered coal. a) Silica Fume c) Flyashb) Carbon d) Ground Granulated Blast Furnace Slag

130. The glass beads shall have a minimum refractive index of ______ . a) 1.80-1.85 c) 1.50-1.55b) 1.60-1.65 d) 1.40-1.45

131. The white thermoplastic material shall not exceed a yellowish index of ______. a) 0.17 c) 0.16b) 0.15 d) 0.12

132. The thermoplastic material shall have a maximum percent residue of _____ after heating at 8 +/- 0.5 hours at 218 +/- 2*C a) 28% c) 30%b) 35% d) 65%

133. The softening point of thermoplastic paint should be _______. a) 106.5+/-9.5*C b) 120.5+/-9.5*Cb) 102.5+/-9.5*C d) 100.5+/-9.5*C

134. As construction progresses, you noticed that the materials delivered at the project site are different from the one tested and passed the requirement, as Materials Engineer what would you do? a) Authorize the use of the materials b) Conduct immediate retesting of the materials for verification purposes c) Reject materials d) Replace the materials

135. What is the test criteria for RCPC test with three ( 3 ) Edge Bearing Test? a) 0.3 mm. c) 0.5 mm. b) 0.4 mm. d) 0.6 mm.

136. Who should take samples of materials and bring them to the laboratory for acceptance purposes? a) DPWH Materials Engineer c) Contractor’s Project Engineer b) Contractor’s Materials Engineer d) DPWH Project Engineer

137. Cement which has been in storage for so long period that there is already doubt as to its quality should be _____________. a) retested prior to use c) authorized to use b) not to used

138. In abrasion test, a sample of 5,000 grams was subjected to abrasion, a 2,000 grams sample was retained in no. 12 sieve after washing, what is the abrasion loss? a) 50 c) 60 b) 40 d) 30

139. Different brand of cement should not be allowed because _____________. a) different in texture c) varies in strength b) different in color when dried

140. PH value of water used in concrete is ___________. a) 4 to 6 c) 6 to 10 b) 6 to 8 d) 3 to 5

141. The request for recoring shall be made by the contractor within _________ weeks after the official result of the coring test has been released if the structure failed to meet strength requirement. a) one ( 1 ) c) three ( 3 ) b) two ( 2 ) d) four ( 4 )

142. The use of Fly Ash concrete mix as mineral admixture in PCCP and as ______ % replaces the Portland cement in concrete mix. a) 15 c) 25 b) 20 d)10

143. This is an instrument used to measure pavement deflections resulting from vehicle wheel loading. The results of the elastic deformation test are used to evaluate the structural condition of roads, and to help in the design of road strengthening measure and road capacity improvement a) Dynamic Cone Penetrator b) Falling Weight Deflectometer c) Three ( 3 ) Meter Straight Edge d) Benkelman Beam

144. This an equipment which is used to measure differential deflection between joints of a concrete pavement to determine the modulus of the existing slabs for use in the design of an overlay. a) Dynamic Cone Penetrometer b) Falling Weight Deflectometer c) Benkelman Beam d) Merlin Road Roughness Measuring Device

145. Vibrator shall not be operated longer than ______ seconds in any one location. a) 10 c) 20 b) 15 d) 25

146. When placing concrete, what is the required temperature of concrete? a) less than 29*C c) less than 30*C b) less than 28*C d) less than 31*C

147. In PCCP coring, what is the specified thickness of an individual measurement that shall not be included in the average? a) less than 20 mm. c) less than 25 mm. b) more than 20 mm. d) more than 25 mm.

148. __________ is the wearing away of the pavement surface caused by the dislodging of aggregate particles. a) Rutting c) Shoving b) Raveling d) Corrugation

149. What is the meaning of ASTM? a) American Standard for Testing Materials b) American Standard for Testing and Materials c) American Society for Testing Materials d) American Society for Testing and Materials

150. A tremie shall consist of a tube having a diameter of not less than ______ mm. constructed in section s having flanged couplings fitted with gasket with a hopper at the top. a) 200 c) 250 b) 300 d) 150

151. The fine aggregate used in stone masonry mortar shall all pass No.____ sieve. a) 40 c) 30 b) 8 d) 3/8

152. For small projects where the quantity of steel bars is less than 10,000 kgs. What may be required as a basis of acceptance. a) P.E. Certificate c) Inspection Report b) Mill Certificate d) All of the above

153. The set of cylinders for each project shall be numbered consecutively beginning with 1 and three specimens should be identified as A, B, and C. At the early stage of pouring, the laboratory should be requested to break the “A” cylinders at 7 days to check what? a) If the structure should be put in service at early stage b) to check the mix design c) To check if there is unusual development when admixture is used d) All of the above

154. The field specimen should be cured from 4 to 7 days at the project under moist conditions obtained by __________. a) covering with wet sand b) covering with saw-dust c) covering with palay-straw d) all of the above

155. The cured cylindrical samples shall be transported to the Regional Laboratory or any testing laboratory accredited by the DPWH in ________________. a) on top of sand b) carefully packed and crated surrounded with damp sawdust or palay straw c) on boxes with sand surrounding the cylinders d) all of the above

156. What is the allowable smooth riding quality of PCCP? a) 5.00 mm. c) 3.00 mm. b) 8.00 mm. d) 6.00 mm.

157. What is the weight boulders required for class A grouted riprap? a) 10 to 25 kgs c) 15 to 30 kgs. b) 15 to 25 kgs. d) 20 to 30 kgs.

158. For a rich mixture of cement in concrete, what determines the flexural strength of the concrete? a) Mortar strength c) both a & b b) the strength of aggregate d) the water/cement ratio

159. As per guidelines on submission of samples, laboratory trial mixes should be made on aggregates which are proposed tube used for the first time, in this case what is the weight of fine aggregates to be submitted for testing? a) 100 kgs. c) 50 kgs. b) 70 kgs. d) 80 kgs

160. A type of cement that sets and hardens by chemical interaction with water and is capable of doing so underwater. a) Portland Cement c) Hydraulic Cement b) Air-Retaining Portland Cement d) All of the above

161. The spacing center to center of circumferential reinforcement of all pipes shall not exceed its wall thickness and shall in no case exceed _______________. a) 150 mm. c) 200 mm. b) 100 mm. d) 250 mm.

162. Oversanded and undersanded concrete mixtures require more water in order to be workable but will only result to ______________. a) good surface texture c) water tightens d) weak strength d) all of the above

163. For every lean mixes or low cement content of the mixture, What determines the flexural strength of the concrete. a) The strength of aggregate c) The mortar strength b) The water cement ratio d) All of the above

164. How many hours does a fine aggregates tested for specific gravity and absorption be soaked in water? a) 15 to 19 hrs c) 35 to 20 hrsb) 20 to 24 hrs d) 18 to 24 hrs

165. What is the maximum mass % of wear by Los Angeles Abrasion Test? a) 40% maximum c) 30% maximumb) 20% maximum d) 10% maximum

166. What is the required speed of Los Angeles Abrasion Machine per minute? a) 30 to 33 rpm c) 20 to 25 rpmb) 40 to 60 rpm d) 100 to 120 rpm

167. What is the size or diameter and weight of cast-iron spheres use in abrasion? a) Approximately 43.8 mm dia. and weighing between 390-455 gramsb) Approximately 68.8 mm dia. and weighing between 390-455 gramsc) Approximately 46.8 mm dia. and weighing between 390-455 gramsd) Approximately 50.8 mm dia. and weighing between 390-455 grams

168. What is the required total wt. of sample for abrasion test of coarse aggregate grading A with 12 number of sphere? a) 9,000 grams +/- 25 grams c) 7,000 grams +/- 25 gramsb) 6,000 grams +/- 25 grams d) 5,000 grams +/- 25 grams

169. What is the significance of abrasion test? a) It evaluate the structural strength of coarse aggregates b) gives an indication of quality as determined by resistance to impact and wear c) it determines whether the aggregate will have degradation during traffic or rollingd) All of the above

170. Quality test for cement is represented by how many bags of cement? a) 3,000 bags or fraction thereof c) 4,000 bags or fraction thereofb) 2,000 bags or fraction thereof d) 1,000 bags or fraction thereof

171. What is the sieve use in sieving materials from Abrasion Machine? a) Sieve # 12 (1.70 mm.) c) Sieve # 200 (0.074 mm.)b) Sieve # 10 (2.10 mm.) d) Sieve # 50 (0.297 mm.)

172. Testing machine should be calibrated once every six (6) months if possible but if it not possible what is the required time should the machine be calibrated? a) Once a year c) Every two yearsb) Every three years d) Every three years

173. What is the percent tolerance of error in calibrating the machine? a) +/- 1.5% c) +/- 2%b) +/- 1% d) +/- 0.5%

174. What do you call a sample for concrete pavement? a) Concrete bar sample c) Concrete cylinder sampleb) Concrete bar sample d) Concrete beam sample

175. How many sample should be taken for every 75 cu, m. of fresh concrete? a) 3 pcs. sample per set c) 2 pcs. sample per setb) 4 pcs. sample per set d) 4 pcs. Sample per set

176. What is the test use to determine the consistency of concrete? a) J- ring test c) Flow testb) Viscosity test d) Slump test

177. How to compute for the slump of concrete? a) Slump = ht. of slump cone – ht. of fresh concrete before subsidence

b) Slump = ht. of tamping rod – ht. of fresh concrete after subsidence c) Slump = ht. of tamping rod – ht. of slump cone d) Slump = ht. of slump cone – ht. of fresh concrete after subsidence

178. At what age should a concrete beam sample be tested for flexural test? a) 4 days c) 3 daysb) 5 days d) 7 days

179. How to compute the flexural strength for third point loading test? a) PL³ / BD² c) PL / BD²b) PL² / BD² d) 3PL / BD²

180. What is the minimum flexural strength for third point loading test? a) 3.8 Mpa (550 psi) c) 4.5 Mpa (650 psi)b) 28 Mpa (4000 psi) d) 24.14 Mpa (3500Psi)

181. What is the minimum flexural strength for center point loading test? a) 3.8 Mpa (550 psi) c) 4.5 Mpa (650 psi)b) 28 Mpa (4000 psi) d) 24.14 Mpa (3500Psi)

182. How to compute for flexural strength at center point loading? a) R = PL / bd² c) R = 3PL / bd² b) R = 4PL / bd² d) R = 2PL / bd²

183. Which part of the batch for fresh concrete should the sample be taken from a stationary mixers, revolving drum truck mixers or agitators? a) two or more regular intervals during discharge of the beginning portion of the batchb) two or more regular intervals during discharge of middle portion of the batchc) two or more regular intervals during discharge of upper portion of the batchd) two or more regular intervals during discharge of later portion of the batch

184. What is the size of tamping rod use in sampling concrete?

a) 16 mm. (5/8 inches) diameter and 610 mm. (24 inches) longb) 610 mm. (24 inches) diameter and 610 mm. (24 inches) long

c) 30 mm. (12 inches) diameter and 610 mm. (24 inches) long d) 16 mm. (5/8 inches) diameter and 610 mm. (24 inches) long

185. Concrete Masonry (hollow blocks) if subject to test, how many sample is required? a) 6 pcs./10,000 units b) 4 pcs./10,000 units b) 12 pcs./10,000 units d) 3 pcs./10,000 units

186. What kind of paint had reflectance in the form of beads? a) Reflectorized Traffic Paint c) Red Oxide Primerb) Epoxy Paint d) Quick Drying Enamel

187. What is the other term for blown asphalt?a) Hard asphalt c) Medium curing asphaltb) Tube asphalt d) Emulsified asphalt

188. If concrete cylinder sample for RCP is not available for compression test one (1) whole piece RCP for every 50 pcs. RCP will be submitted for quality test. a) False b) True

189. One set (3 pcs ) concrete cylinder sample shall be taken for every how many pieces of RCP? a) 15 pcs. c) 50 pcs.b) 75 pcs. d) 25 pcs.

190. In submitting samples for testing, what particular form is being accomplished? a) calibration report c) mill certificateb) time card d) sample card

191. As a Materials Engineer of the project what is the report accomplished every week? a) Quality Control Assurance Reportb) Work Methodologyc) Mill Certificationd) Calibration Report

192. What do you call the report to be submitted by Materials Engineer at end of the month? a) Certificate of Completionb) Monthly Materials Reportc) Accomplishment Reportd) Material Summary Report

193. How to determine the thickness of pavement? a) by visual inspectionb) by dynamic cone penetrometer

c) by concrete coring d) by spectrometer

194. All records regarding quality control such as accomplishment, daily activities, weather etc. are recorded in a ________. a) Materials Log Bookb) Materials Field Bookc) Quality Control Recordd) Quality Control Log Book

195. The main quality problem associated with wrong practice of conveying concrete is_____. a) Segregation c) Ravellingb) Deformation d) Honeycomb

196. The specification call for 1:2:3 concrete mix. In one bagger mixer, which of the following amount of water is most likely required for the mix? a) 10 liters c) 50 litersb) 30 liters d) 20 liters

197. Where do we take additional cores when the measurement of any core taken from the pavement is deficient in thickness by more than 25 mm? a) At no less than 4 meters intervals parallel to the centerline in each direction from the affected locationb) At no less than 15 meters intervals parallel to the centerline in each direction from the affected locationc) At no less than 10 meters intervals parallel to the centerline in each direction from the affected locationd) At no less than 5 meters intervals parallel to the centerline in each direction from the affected location

198. Quality Control testing in a DPWH project is the responsibility of the ___________. a) DPWH and Contractor’s Materials Engineersb) QC Headc) Project Managerd) Project Engineer

199. As Material Engineer, when is the right time to start sampling and testing aggregates of the coarse materials? a) at the completion of the projectb) after the course materials be incorporated in the projectc) before the course materials be incorporated in the projectd) during the course materials be incorporated in the project

200. Sampling of the freshly mixed concrete should be taken on the _______ batch discharge of the transit mixer. a) lower c) first

b) middle d) end

201. How many times per layer should a concrete specimen molded in a 6”x6”x21” beam mold be rodded? a) 63 times c) 25 timesb) 30 times d) 12 times

202. What is the basis for acceptance or rejection of any construction materials? a) Materials Test Report c) Calibration Reportb) Mill Certificate d) Sample Card

203. In testing concrete cylinder sample the load applied should be continuous without shock at a constant rate within the range of _______ per second. a) 0.54 to 0.34 Mpa per second or 20 to 50 psi per second

b) 0.34 to 0.44 Mpa per second or 20 to 50 psi per secondc) 0.25 to 0.35 Mpa per second or 20 to 50 psi per secondd) 0.14 to 0.34 Mpa per second or 20 to 50 psi per second

204. During the application of the first half of the anticipated load a _______ rate of loading shall be permitted. a) same c) lowerb) higher d) both a & b

205. Which is not the duty or responsibility of Materials Engineer? a) quantity of construction materialsb) quality of construction materialsc) testing of construction materialsd) both b & c

206. Problem regarding quality of construction materials shall be reported directly by the contractor’s Materials Engineer to the __________. a) DPWH Materials Engineer c) Project Engineerb) Project Manager d) DPWH Secretary

207. How many concrete cylinder is required for a 3,000 pcs. reinforced concrete pipe culvert? a) 120 sets (consisting of 2 pcs. concrete cylinder per set) b) 120 sets (consisting of 3 pcs. concrete cylinder per set)c) 60 sets (consisting of 3 pcs. concrete cylinder per set)d) 60 sets ((consisting of 2 pcs. concrete cylinder per set)

208. If the concrete cylinder is not available for a 3,000 pcs. culvert pipes, how many pipes shall be subjected to crushing test? a) 30 pcs. culvert pipes c) 60 pcs. culvert pipes b) 40 pcs. culvert pipes d) 50 pcs. culvert pipes

209. How is the sample taken from the finished pavement? a) by means of impulse breakerb) by means of grinderc) by means of core drill or sawd) by means of jack hammer

210. What is the slump of a workable concrete if not vibrated? a) 40 – 75 mm, when vibrated the slump is 10 to 40 mmb) 50 – 85 mm, when vibrated the slump is 20 to 50 mmc) 60 – 85 mm, when vibrated the slump is 50 to 70 mmd) 30 – 85 mm, when vibrated the slump is 20 to 50 mm

211. How long shall the forms remain undisturbed after concrete pouring? a) 24 hrs. c) 18 hrs.b) 36 hrs. d) 12 hrs.

212. Retempering of concrete or mortar, which has partially hardened, will be permitted with the addition of cement, aggregate or water. a) yes b) no c) it depends on the condition of concrete d) check the slump

213. What is the minimum number of representative cores that shall be taken from each member area of concrete in place that is considered deficient? a) 3 cores

b) 4 cores c) 5 cores d) core must be taken at 5 meter interval backward & forward of the designed sta.

214. the strength level of concrete will be considered satisfactory if the average of all sets of three consecutive strength test result equal or exceed the specified strength and no individual strength test result is deficient by more than how many percent? a) 25% c) 20% b) 15% d) 10%

215. For major interchanges and busy intersection, PCCP will be allowed to open on the ----------- to minimize occurrence of road congestion. a) 14th day c) 10th day b) 12th day d) 7th day

216. The width of the weaken plane joint is __________. a) not more than 6 mm. b) not more than 7 mm.b) not more than 4 mm d) not more than 5 mm

217. When is the right time to saw the weaken plane joint? a) within 24 hrs. as soon as concrete has hardened sufficientlyb) within 3 hrs. while concrete is still in plastic statec) within 2 hrs. as soon as concrete has hardened sufficiently d) within 24 hrs. while concrete is still in plastic state

218. Tie bars shall not be coated or painted with asphalt or other materialsa) True b) False

219. What are the metal device that is used as a load transfer device held in a position parallel to the surface and centerline of the slab of pavement? a) tie wires b) tie barsc) clips d) dowels

220. To protect dowel from corrosion and to facilitate sliding in concrete, it shall be coated with _________. a) epoxy paint c) form oilb) thin film of bitumen d) plastic

221. The surface of the pavement shall be roughened by means of ____________. a) brooming c) sawing

b) chipping d) patching

222. What is the depth of corrugation produce by brooming in the surface of the pavement? a) 2mm c) 1.5 mm.b) 3 mm d) 4 mm

223. The surface of the newly placed concrete when it is sufficiently set shall be cured for a period of _________. a) 24 hrs. c) 72 hrs.b) 36 hrs d) 48 hrs

224. The curing of the pavement are done on the following: Ans. a) by covering the concrete with mats saturated with water b) by ponding c) by applying curing compound after finishing of the surfaced) all of the above

225. When is the right time the joint be sealed? a) during the curing period or before it is opened to trafficb) after 12 hoursc) after the curing period or before it is opened to trafficd) before the curing period