supply of building material , provn of building material for nagrota ( quantity may vary at the time placing supply order ) . , cement of 43 grade opc conforming to is 8112/1989 in sealed bags each weighing 50 kg . the date of manufacture of cement should not be more than one month prior to the date of delivery . make: ambuja /acc/ birla/jk lakshmi/ultra tech/shree ultra , fine aggregate ( sand ) conforming to is : 383-1970 . , crushed stone aggregate 20 mm graded conforming to is 383-1970 . , crushed stone aggregate 40 mm graded conforming to is 383-1970 . , cement concrete solid bricks of size 9x4 . 5x3 , grade a , conforming to is : 2185 , hardcore 40 mm to 63 mm broken boulder stone confirm to is 383-170 . , brick bats