bids are invited for ordinary portland cement of 43 grade in 50 kg bag conforming to is 1489 make ambuja or acc or ultratech , fine sand conforming to is 383 of 1970 as approved , crushed stone aggregate 20mm grade conforming to is 383 of 1970 as approved , crushed stone aggregate 40mm grade conforming to is 383 of 1970 as approved , hardcore 63mm conforming to is 383 of 1970 as approved , brick sub class b of size 23x11point 5cm conforming to is 1077 of 1986 avg compressive str not less than 75kg per cm2 , 75mm dia swr pipe 6 kg per cm3 conforming to is specifications and as per sample approved