PACKAGE : I Bid Document VOLUME : II - Public Health Engineering

After absorbing water the bricks shall not exceed 16% of their dry weight as per
IS:No. 1077-19970. According to IS:No. 1077-1970 crushing load shall not be less
than 50 Kg./Sqcm.
The brick to be used for the entire work shall be approved by the Engineer-in-
Charge (EIC).
Sand.
The source from which sand is to be obtained shall be subject to the approval of
Engineer-in-charge. The sand shall be clean, sharp and gritty to touch and be freed
from earth and other impurities by washing
The sand shall be washed to such a degree that when a handful is mixed with clean
water in a glass and allowed to stand for an hour the precipitate of mud over the
sand shall not exceed 5%.
Coarse sand : It is to be screened through a sieve of 64 meshes to the square inch so
as to exclude large particles form the work. The fineness modulus shall not be less
than 1.0. The size of Coarse Sand shall be within 4.75 mm to 2.00 mm.
Fine sand : It is to be screened through a sieve of 64 meshes to the square inch so as
to exclude large particles from the work. The fineness modulus shall not be less
than 2.5. The size of the fine sand shall be within 425 micron to 75 micron. The
sand should conform to IS 382-1982 for fine and course aggregates from natural
sources.
Stone chips.
It shall be obtained from crushing trap quartzite or hand stones and from quarries
approved by Engineer-in-charge. It shall be of approved quality and proper grade. It
shall pass through 20mm mesh and retained on 6mm mesh. It shall be free from
dirt, leaves, clay and any organic matter. The material conforming generally to
IS:383-1983 for course and fine aggregate from natural sources or IS:515-1959 for
natural and manufactured aggregates for use in mass concrete with latest revisions.
Cement.
For all type of cement related to work. 43 grade Ordinary Portland Cement (OPC)
conforming to relevant IS Codes is to be used depending upon the type of the
structures.
GTS : General Technical Specification. Page 6