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.
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Conclusion
The compressive strength of bloc 1, 2 and 3 were determined to
be 32('.1, %&7'.&, 2(').& psi respectively.
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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,.