Er Vidya sagar

The cement used shall he any of the following and the type selected should be appropriate for the intended use: a) 33 Grade ordinary Portland cement conforming to IS 269 b) 43 Grade ordinary Portland cement conforming to IS 8112 c) S3 Grade ordinary Portland cement conforming to IS 12269 d) Rapid hardening Portland cement conforming to IS 8041 e) Portland slag cement conforming to IS 4;5 f) Portland pozzolana cement (fly ash based) conforming to IS 1489 (Part 1) g) Portland pozzolana cement (calcined clay based) conforming to IS 1489 (Part 2) h) Hydrophobic cement conforming to IS 8043 j) Low heat Portland cement conforming to IS 12600 k) Sulphate resisting Portland cement conforming to IS 12330 Other combinations of Portland cement with mineral admixtures (see $.2) of quality conforming with relevant Indian Standards laid down may also be used in the manufacture of concrete provided that there are satisfactory dati on their suitability, such as performance test ~ concrete containing t...

Rice husk ash giving required performance and uniformity characteristics may be used with the approval ofthe deciding authority. NOTE-Rice husk esh is produced by burning rice husk and contain largeproportion of silica.To achieve amorphous state, ricehuskahay beburntat controlledtemperature, Itis necessary toevoluat8 the productfroma particularsourcefor performance and unirofmity since it con ran,e from beinl as deleteriousas silt when.~ncorporated in concrete. Waterdemand and dryinl shrinkage ',should be studiedbefore using rice husk.