(d) High strength ordinary Portland cement conforming to IS8112.
Prestress concrete requires concrete, which has a high compressive strength reasonably
early age with comparatively higher tensile strength than ordinary concrete. The concrete
for the members shall be air-entrained concrete composed of Portland cement, fine and
coarse aggregates, admixtures and water. The air-entraining feature may be obtained by
the use of either air-entraining Portland cement or an approved air-entraining admixture.
The entrained air content shall be not less than 4 percent or more than 6 percent.
Minimum cement content of 300 to 360 kg/m is prescribed for the durability requirement.
The water content should be as low as possible.
High tensile steel , tendons , strands or cables
The steel used in prestress shall be any one of the following:(a) Plain hard-drawn steel wire conforming to IS1785 (Part-I & Part-III)
(b) Cold drawn indented wire conforming to IS6003
(c) High tensile steel wire bar conforming to IS2090
(d) Uncoated stress relived strand conforming to IS6006
High strength steel contains:
0.7 to 0.8% carbons,
Durability, Fire Resistance & Cover Requirements For P.S.C Members:According to IS: 1343-1980