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Specifications for cement, Specifications for physical properties of Portland cements

Er. Parbhakar Dwivedi
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Specifications for cement:

Portland cement is manufactured in controlled conditions. For engineers, physical properties of cement are relevant as acceptance criteria. These are, therefore summarized in table 1.1

Specifications for physical properties of Portland cements

Table 1.1 Specifications for physical properties of Portland cements
S. No. Properties 33 Grade OPC (IS 269) 43 Grade OPC (IS 8112) 53 Grade OPC (IS 12269) Rapid Hardening Portland Cement (IS 8041) Low Heat Portland Cement (IS 8041) Super Sulphate cement (IS 6909) Portland Pozzolana cement (IS 1489 )
1 Fineness
a) Residue by wt. on IS sieve 90 micron not to exceed percent 10 - - - - - -
b) Specific surface (cm2/g) by air permeability method not less than 2250 2250 2250 3250 3200 4000 3000
2 Setting time (in min.)
a) Initial setting time not less than 30 30 30 30 60 30 30
600 600 600 600 600 600 600 600 600
3 Compressive Strength (Kg/cm2) of 1:3 cement mortar cube:
At 1 days (24 h +30 min) not less than 160
At 3 days (72 h +1h) not less than 160 230 270 275 100 150
At 7 days (168 h +2h) not less than 220 330 370 160 220 220
At 28 days (672 h +4h) not less than 430 530 350 300 310
Note: For compressive strength test, standard sand specified in IS: 650 (revised) should be used.
4 Soundness
By Le Chatelier method specimen shall not have an expansion of more than (mm) 10 10 10 10 10 5 10
By Autoclave method specimen shall not have expansion of more than (percent) 0.8 0.8 0.8 0.8 0.8 - 0.8
5 Maximum Heat of hydration
At 7 days not more than - - - - 65 - -
At 28 days not more than - - - - 75 - -
6 Drying Shrinkage
Max. percentage - - - - - - 0.15

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