Specifications for Thatta Sulphate Resistant Cement

Thatta Cement Company Limited produces sulphate resistant cement (SRC) meeting the requirements of Pakistan Standard PS 612-1989(R) as follows:

 
Mechanical & Physical Properties
Unit
Thatta SRC
Limits as per PS 612-1989(R)
Compressive Strength (Mpa)
 3 Days
Mpa
> 25
 > 20
 7 Days
Mpa
> 35
 > 29.5
 28 Days
Mpa
> 49
 > 39
Setting Time - Minutes
 Initial
Minutes
>100
 > 45
 Final
Minutes
< 200
< 600
 Le-Chatelier (mm)
mm
< 1.00
 < 10
Fineness
 Fineness
m2/kg
> 290
 > 250
 
Chemical Requirements
 Loss of Ignition (LOI)
%
< 2.5
< 3.0
Insoluble Residue (IR)
%
< 0.50
< 2.0
Magnesium Oxide (MgO)
%
< 2.00
< 4.0
 Sulphur Trioxide ( SO3)
%
< 2.50
 < 2.5%
LSF
 
0.9 
0.66-1.02
C3A
 
< 3.00
< 3.5
Typical Chemical Composition of Thatta SRC is given below:
Chemical Compound
SiO2
Al2O3
Fe2O3
CaO
MgO
K2O
Na2O
SO3
Cl
Percentage by Mass
> 20
> 4.0
> 4.5
> 62.00
< 1.50
< 0.40
< 0.30
< 02.50
0.005
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