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

The fine aggregate for cement mortar for masonry and first coat of plaster should
generally satisfy the following grading:
I.S. Sieve Percent by wt. Passing sieve
4.75mm 100
2.36mm 80-95
1.18mm 70-90
600microns 40-85
300microns 5-50
150microns 0-10
The fineness modules shall not exceed 3.00.
The fine aggregate for cement mortar for fine joints of ashlars masonry, pointing
and second coat of plaster may have the following grading:
I.S. Sieve Percent by wt. Passing sieve
4.75mm 100
2.36mm 100
1.18mm 75-100
600microns 40-85
300microns 5-50
150microns 0-10
The fineness modulus shall not exceed 1.6.
IS:2116-1980 shall generally apply for sand for plaster. The fine aggregate should
be stacked carefully on a clean, hard surface so that it will not get mixed up with
deleterious foreign materials.
Proportion:
Cement and sand shall be mixed in specified proportions, sand being measured in
measuring boxes. The proportions will be by volume. The mortar may be hand
mixed or machine mixed.
Preparation:
In hand mixed mortar, cement and sand in the specified proportions shall be
thoroughly mixed dry on a clean impervious platform. Fresh and clean water as
specified above shall be added gradually and thoroughly mixed to form a stiff
plastic mass of uniform colour so that each particle of sand shall be completely
covered with a firm of wet cement.
GTS : General Technical Specification. Page 79