qa and q c - 04.06.09
TRANSCRIPT
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HEARTY
WELCOMEAPUFIDC.
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Quality Control/Quality Assurance InConstruction
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3rd PQA UIDSSMT Agencies
Selected through Tendering Process.
Agencies appointed
M/s NCPE Hyderabad
Aarvee Associates.
M/s DHV Consultants.
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APPROVALS
G.O 487 MA dated23.10.2003 ---CCF
G.O.Rt No.512 dated1.4.08---- UIDSSMT
G.O.Rt. No.639 dated 25.4.09- UIDSSMT.
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Quality Control wings
Departmental QC
one division for two circles.
Conducting the specified tests in
accordance with the sampling criteriaat all stages of process to ensure therequired quality parameters.
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Quality Assurance (QA)
Managerial methods designed to plan,monitor and control to assure the Qualityof all the processes such that the end
product satisfies the desired properties.
carry out random tests duringpreconstruction, construction and postconstruction stages.
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Quality Assurance (QA)
Eliminates poor services and inducesgreater professionalism in the process,instills public confidence and acceptance.
Avoids inefficiency and litigation.
Eliminates the interferiences.
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Quality Managementbenifits
Quality of the design process
Quality of the construction process
Quality of the products
Quality of maintenance.
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Frequency of Reporting
QA Reports to
1.Executive Engineer.
2.Supertending Engineer. 3.SLNA.
At Twice in a month Satisfactory.
Immediate reporting Adverse reports. Action taken reports monitored by SLNA
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Quality Standards -Roads
IRC: 58 Guidelines for the Design of Plain JointedRigid Pavements for Highways
IRC 15:2002 Code of practice for construction ofrigid pavements
IRC SP: 62 Guidelines for the Design andConstruction of CC Pavements for Rural Roads
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Frequency of sampling- Concrete
Test results shall comply with IS: 456-2000
1-5 cum 1 sample 6-15 cum 2 samples 16-30 cum 3 samples 31-50 cum 4 samples 51 and above 4 +1 addl. sample for addl. 50 m3 or part
At least one sample shall be taken from each shift
Core tests to be conducted as per IS: 456 for the purpose of detailedinformation.
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Sampling -continue
SWG..I S 651-2007
PSCI S 784.2001
BWRC I S 15155-2002 PVC.I S 4985-2000
GRP.I S 12709-1994
Di..I S 8329-2000 HDPEI S4984-1995
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Tests-Building Materials
Bricks---- IS 1077-1992.
Cement bricks..IS 2185-1979.
Aggregates---------I S 2386- Part 1to7
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Test Frequency
(i) Aggregate Impact Value 1 test per 250 cum or per day
(ii) Grading of aggregate andscreenings
2 tests per 250 cum or per day
(iii) Flakiness Index 1 test per 250 cum or per day
(iv) Atterberg limits of bindingmaterial, if required
1 test per 50 cum or per day
(v) Water absorption 1 test per source (threerepresentative specimens foreach source)
(vi) Thickness Regularly
Quality Control Tests
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Test Frequency
(i) Quality of Binder 1 test per lot of 10 tonnes
(ii) Aggregate Impact Value (or LosAngeles Abrasion Value)
1 test per 250 cum
(iii) Flakiness and Elongation Index 1 test per 250 cum or per day
(iv) Stripping value 1 test per source (three representativespecimens for each source)
(v) Water absorption 1 test per source (three representativespecimens for each source)
(vi) Grading 1 test per 100 cum or per day
(vii) Soundess (Magnesium and SodiumSulphate)
1 test per source
(viii) Temperature of binder atapplication
Regular close intervals
(ix) Rate of spread of materials (binder
and stone chips)
1 test per 1000 sq m or per day
Quality Control Tests and their frequency
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Test Frequency(i) Quality of Binder 1 test per lot of 10 tonnes
(ii) Aggregate Impact Value (or LosAngeles Abrasion Value)
1 test per 250 cum or per day
(iii) Flakiness and Elongation Index 1 test per 250 cum
(iv) Stripping value 1 test per source (three representativespecimens for each source)
(v) Water absorption 1 test per source (three representativespecimens for each source)
(vi) Grading 1 test per 100 cum or per day
(vii) Soundess (Magnesium and SodiumSulphate)
1 test per source
(viii) Temperature of binder at application Regular close intervals
(ix) Binder content 2 tests per day
(x) Thickness of BM Layer Regularly
(xi) Density of compacted layer 1 test per 1000 sq.m. area or per day
Quality Control Tests and their frequency
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Frequency of visits-concrete
Based on the type and importance of thework.
1 No---materialpre construction
1no- Reinforcement for each component
1no-For concreting of each component.
1no- Columns at each staging. 2nospost construction.
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Frequency of visits-pipelines
Material testing ------Factory
Laying &Joiting.
1no---- 1km upto 200 mm dia 1no----.50Km upto 500 mm dia
1no----.25 Km beyond 500mm dia.
Hydraulic test; 1no on Average 5 kms
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Testing - Cores
In case of doubt regarding thecomp.strength tests on cores
and/or load test shall be carried
out. Core tests: the ave. equivalent cube
strength of the cores is equal to at least
85% of the cube strength of the grade ofconcrete specified for the correspondingage and no individual core has strengthless than 75%
t it i
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cceptance criteria-Roads
The Test results of the sample variation is morethan + 15% of the average,the test results of thesample are invalid.
The mean strength results complies with the
appropriate limits in col.2 of table 11 of IS:456-2000
Any individual test result complies with theappropriate limits in col.3 of Table 11 of IS:456-
2000
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Payment in case of deficiency in
thickness CC roads
Up to 5mm
6-10mm
11-15mm
More than 15mm
100% of rate
87% of rate
81% of rate
Rejection
A days work is considered for
thickness.
If average deficiency is morethan 15mm identified by cores,such slabs shall be Removed bycontractor.
Penalties can belevied as per
agreementconditions fordefective works
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Acceptance/Recovery-CC slab
Mastic pads not used/defective material used- Deductionof twice/equal to cost of mastic pads .
Joint sealing not done.Deduction of twice/equal to cost ofjoint sealant.
Failure of CC cubes- payment based on core tests at thecost of contractor @2 cores/150cum of
Progressive surface damage-Withholding payment untildefects liability period.
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Recovery criteria-CC pavements
Metal exposed- Affected area of CC road tobe rejected
Water stagnation- Payment to be made after
rectification.
Improper curing- deduction of cost of
pavement for the affected area and paymentbased on core tests at the cost of contractor.
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Acceptance criteria-CC (1:4:8)
Deficient thickness up to 10% of ave. -Proportionate recovery of affected area
Deficient thickness above 10%-Proportionate
recovery of twice the cost of affected area
Improper curing- Deduction of twice the curingcharges and payment based on core tests at the
cost of contractor.
Improper compaction-Payment based on cube tests
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Acceptance criteria-CC lean concrete
Oversize metal upto 10%- No recovery
Oversize metal 10% to 20%- recovery at25% of difference in basic rate of metal andnext higher size metal
Oversize above 20%- Rejection
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Acceptance criteria-WBM roads
Verify for over size
Verify density of metal in an area of 0.50 m x0.50 m for each layer
In respect of thickness and less quantity ingravel and WBM layers, a maximum tolerance of20% may be allowed
In respect of recoveries upto 10%, estimate cost
is to be recovered From 11 to 20%, 1 times estimate cost is to
be recovered
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Acceptance criteria-WBM roads-Contd.
Over size metal upto 10% - no reecovery
Over size metal 10%to20% - recovery at 25% ofdifference in basic cost of metal and the next
higher size metal Over size of metal between 30% to 40% - Rate
of next higher size metal shall be allowed
Over size metal above 40% - Rejection of metal
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Acceptance criteria-Bituminous layers
A maximum of 10% variation may be allowed inrespect of less thickness and less quantity
Deficient thickness upto 10%-Estimate cost is to berecovered
Deficient thickness above 10%- Rejection of thelayer
Bitumen content deficient upto 0.30%by weight ofthe total mix- Recovery of cost of bitumen for
reduced quantity Bitumen content deficient by more than 0.30%-
Rejection of the work.
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Thanking YouProject Manager
APUFIDC.