Specifications for Thatta Portland Blast Furnace Slag Cement

Thatta Cement Company Limited produces portland blast furnace slag cement (PBFS) meeting the requirements of Pakistan Standard PS 1631-1984(R) as follows:

 
Mechanical & Physical Properties
Unit
Thatta PBFS
Limits as per PS 1631-1984(R)
Compressive Strength (Mpa)
 3 Days
Mpa
> 20
 > 15
 7 Days
Mpa
> 26
> 23
 28 Days
Mpa
> 38
> 34
Setting Time - Minutes
 Initial
Minutes
>120
 > 45
 Final
Minutes
< 230
 < 600
 Le-Chatelier
mm
< 10
Fineness
 Fineness
m2/kg
> 300
 > 250
 
Chemical Requirements
 Loss of Ignition (LOI)
%
< 2.80
< 3.0
Insoluble Residue (IR) %
< 0.80
< 1.5
Magnesium Oxide (MgO)
%
< 2.50
 < 7.0
 Sulphur Trioxide SO3
%
< 2.80
 < 3.0
LSF
 
0.7
0.66-1.02
AM
 
< 1.3
> 0.66
Typical Chemical Composition of Thatta PBFS is given below:
Chemical Compound
SiO2
Al2O3
Fe2O3
CaO
MgO
K2O
Na2O
SO3
Cl
Percentage by Mass
> 21.00
> 05.00
> 3.50
> 58.00
< 2.50
< 0.40
< 0.30
< 02.80
00.01
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