Specifications for Thatta Ordinary Portland Cement

Thatta Cement Company Limited produces ordinary portland cement (OPC) Grade 43 meeting the requirements of Pakistan Standard PS 232-2008(R) as follows:

 
Mechanical & Physical Properties
Unit
TCCL Typical Values
Limits as per PS 232-2008(R)
Compressive Strength (MPa)
 3 Days
Mpa
> 26
> 23
 7 Days
Mpa
> 36
> 33
 28 Days
Mpa
> 50
 > 43
Setting Time - Minutes
 Initial
Min
>100
 > 30
 Final
Min
<200
< 600
 Le-Chatelier
mm
< 2.00
 < 10
Fineness
 Fineness
m2/kg
> 290
 > 250
 
Chemical Requirements
Loss of Ignition (LOI)
%
<2.50
<3.0
Insoluble Residue (IR)
%
<0.5
 <1.5
Magnesium Oxide (MgO)
%
<1.5
 <6.0
Sulphur Trioxide ( SO3)
%
< 2.50
 <3.0
LSF
 
0.90
 0.66-1.02
AM
 
>0.80
 >0.66
Typical Chemical Composition of Thatta OPC is given below:
Chemical Compound
SiO2
Al2O3
Fe2O3
CaO
MgO
K2O
Na2O
SO3
Cl
Percentage by Mass
> 20.00
> 4.00
> 4.00
> 62.00
< 1.50
< 0.40
< 0.30
< 02.50
0.005
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