compressive strength of mortar cubes assignment

8/19/2019 Compressive Strength of Mortar Cubes assignment

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Lab Report: NO. 3

REG #: 13/0905/0276

Course Name: Materials Technology (C! 1101"

Title: Co#$ressi%e strength o& Mortar c'es

Aim: To )eter#ine the co#$ressi%e strength o& #ortar c'es


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Introduction

The $'r$ose o& carrying o't this la re$ort is to otain the co#$ressi%e strengths o&

#ortar c'es* +hich +as )one y #a,ing #ortar c'es o& san)* ce#ent an) +ater.

These +ere #i-e) accor)ingly an) allo+e) to set* then* $lace) in +ater to c're

&or 7 )ays* re#o%e) &ro# the +ater an) cr'she) 'sing the co#$ression testing

#achine.

The co#$ressi%e strength o& $artic'lar 'il)ing #aterials s'ch as #ortar c'es are

nee)e) y researchers to )eter#ine +hether the #aterial or #etho) o& 'sing the

#aterial is s'itale &or the $roect that is eing con)'cte).

ccor)ing to re&erence an) ac,gro'n) in&or#ation* the res'lts otaine) &or the

co#$ressi%e strengths otaine) &or the 7 )ay #ortar c'e +as &o'n) to e

consistent. On the other han)* the 1 )ay #ortar c'e +as &o'n) to e inconsistent

this #ay ha%e een )'e to %ario's conta#inations an) other circ'#stances

a&&ecting the c'e.


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Theoretical Information

hen a &orce concentrate) on the area oect or sa#$le eco#es too large that it

ca'ses the oect to start rea,ing )o+n this is calle) co#$ressi%e

strength. trength o& ce#ent )e$en)s '$on the correct #i-t're an) $ro$ortioning

o& aggregates. The Co#$ressi%e strength o& a #ortar c'e is &ail're loa) (4s"

)i%i)e) y its area (inches2" or 'sing the +eight in Ne+tons an) )i%i)e) this y

area in #eters s'are) (#2". The 'nit there&ore &or the co#$ressi%e strength is

$o'n)s $er s'are inch ($si" or Ne+ton #eters (N/#2". Co#$ressi%e testing is

)one to ens're that the #aterials to e 'se) in a researchers $roect are s'itale. n

the &iel) a s$eci&ie) strength &8 #ay e gi%en to the researcher an) to s'it this

co#$ressi%e test #'st e )one on the #aterials to e 'se) the co#$ressi%e

strength o& the researchers #aterials sho'l) not &all 500$si elo+ the re'ire)

strength* nor sho'l) it e #ore than 5000$si &or that s$eci&ie) strength.


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Materials

ortlan) ty$e 1 ce#ent

ater: so'rce ta$

an)

;'rnit're Oil to l'ricate #o'l)s

Equipment

ta#$ing er,el* #o)el no. 605* #a- 30,g* #in 100g* error

5/log (%al'e"

Mo'l)s

Meas'ring cylin)er ?ay Tec* 1000#l* > 60* 20@ C

Mi-ing an

Tro+el

Co#$ression A testing #achine

Eperimental !rocedure


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1. sa#$le o& san) an) ce#ent o& &i-e) $ro$ortions +as #i-e) (1B5 ce#ent*

555 san) an) 7g +ater".

2. Three #o'l)s +ere $re$are) y cleaning an) l'ricating the inner s'r&ace

+ith oil.

3. The ce#ent +as $lace) in #o'l)s o& 3 layers the layers +ere co#$acte) y

ta#$ing 25 ti#es each to ens're co#$atiility.

. The c'es +ere re#o%e) &ro# the #o'l)s a&ter 2 ho'rs. The #o'l)s +ere

then s'#erge) &or se%en (7" )ays5. The #o'l)s +ere +eighe).

6. The )i#ensions o& the #o'l) +ere recor)e) an) the %ol'#es calc'late).

7. The &ail're loa)s o& the c'es +ere estalishe) y the 'se o& co#$action

testing #achine.

B. ;or each c'e the )ensity an) co#$ressi%e strength +as calc'late) an)

recor)e).


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Eperimental results

Table 1: showing results obtained from compression tester.

>loc, ge()ays"

Di#ensions(inches"

eight ;ail'reloa)

(ls"

1 7 2.75 0.7B5

,g/1.7ls

25000

2 7 2.75 0.B05

,g/1.Bls

31000

3 7 2.75 0.790

,g/1.7ls

22000


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Anal"sis of results

Co#$ressi%e strength (C." E &ail're loa) (ls" / cross sectional area o& c'e

(inches"

!ol'#e o& c'e E length - +i)th - reath (inches3"

rea o& c'e E length - +i)th (inches2"

Density E #ass/%ol'#e

Tale 2: sho+ing the res'lts &or #ortar c'e calc'lations

>loc, Co#$ressi%e

strength o& #ortar

c'es ($si"

)ensity

(ls/&t3"

rea (inches2" !ol'#e

(&t3"

1 32B9.1 1.00 7.6 1.75

2 079.0 1.03 7.6 1.75

3 2B95.0 1.00 7.6 1.75


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Discussion

Each mould was given a day to harden and 7 days to cure. The

compressive strengths for cubes 1, 2 and 3 had varying results as

no two blocs will be alie due to varying air pocets, human error

and pacing of mould. The density of each bloc varied but a

correlative feature was observed , in that the higher the density

the greater the cube!s resistance to force e"erted by the

compression tester machine and this due to the greater

compaction of the mortar cube #tighter bonding$ . The highest

recorded compressive strength was from bloc 2, being %&7'

which also has the highest density.


9/11

Conclusion

The compressive strength of bloc 1, 2 and 3 were determined to

be 32('.1, %&7'.&, 2(').& psi respectively.


10/11

References:

Mortar co#$ressi%e strength*

htt$://+++.ce#ent.org/#asonry/co#$ressi%eFstrength.as$ otaine): 20131107

http://www.cement.org/masonry/compressive_strength.asphttp://www.cement.org/masonry/compressive_strength.asp


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Appendi

;ig're 1: sho+ing co#$ressing o& a ce#ent loc,.

compressive strength of mortar cubes assignment

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