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

10.3 Preparation of Mortar for Plastering.
Materials:
Cement Mortar:
Cement mortar shall have the proportion of cement to sand as mentioned in the item
or in the special provisions and shall comply with following:
Cement:
Cement shall conform to IS:12269-1987 Ordinary Portland Cement shall be used.
The weight of ordinary Portland cement shall be taken as 50 kg. per bag. The
Contractor shall ensure that the cement is of sound and required quality before
using it. Any cement, which has deteriorated, caked or which has been damaged
shall not be used. The Specifications covered under the section brickwork and
concrete work shall be applicable in addition.
Water:
Water shall be clean, clear and free from injurious quantities of salt, traces of oil,
acids, alkalis, organic matter and other deleterious materials. The sources of water
shall be approved by the Engineer and the containers for conveyance; storage and
handling shall be clean. If necessary, standard cement tests shall be conducted
using the water intended to be used, in comparison with those adding distilled water
to check quality of water.
Water shall meet the requirement of 4.3 of IS:456-2000. Generally potable water is
fit for mixing and curing.
Fine Aggregate:
All fine aggregate shall conform to IS:38-1970 and relevant portion of
IS:515-1959.
Sand shall be clean, well graded, hard, strong, durable and of gritty particles free
from injurious amounts of dust, clay, kankar nodules, soft or flaky particles, shale,
alkali, salts, organic matter loam mica or other deleterious substances and shall be
approved by the Engineer. The maximum size of particles shall be limited to 5mm.
If the fine aggregate contains more than 4 percent of clay, dust or silt, it shall be
washed.
GTS : General Technical Specification. Page 78