PACKAGE : I Bid Document VOLUME : II - Public Health Engineering
PACKAGE : I Bid Document VOLUME : II - Public Health Engineering
PACKAGE : I Bid Document VOLUME : II - Public Health Engineering
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e) Aggregates shall, except as noted above, consist of natural sands, crushed stone<br />
from a source known to produce satisfactory aggregate for concrete and shall be<br />
chemically inert, strong, hand, durable against weathering of limited porosity<br />
and free from deleterious materials that may cause corrosion of the<br />
reinforcement or may impair the strength and or durability of concrete. The<br />
grading of aggregates shall be such as to produce a dense concrete of specified<br />
strength and consistency that will work readily into position without<br />
segregation and shall be based on the “mix design” and preliminary tests on<br />
concrete specified later.<br />
f) Aggregates having a specific gravity below 2.6 (saturated surface dry basis)<br />
shall not be used without the special permission of the Engineer.<br />
ii. Fine Aggregate:<br />
a) General:<br />
Fine aggregate shall consist of natural or crushed sand conforming to<br />
IS: 383. The sand shall be clean, sharp, hard, strong and durable and<br />
shall be free from dust, vegetable substances, adherent coating, clay,<br />
alkali, organic matter, mica, salt or other deleterious substances, which<br />
can be injurious to the setting qualities/strength/durability of concrete.<br />
(i) Machine-made Sand: Machine-made sand will be acceptable, provided the<br />
constituent rock-gravel composition shall be sound, hard, dense, non-organic,<br />
uncoated and durable against weathering.<br />
(ii) Screening and Washing: Sand shall be prepared for use by such screening<br />
or washing, or both, as necessary, to remove all objectionable foreign matter<br />
while separating the sand grains to the required size fraction.<br />
(iii) Foreign material limitations: The percentage of deleterious substances in<br />
sand delivered to the mixer shall not exceed the following:<br />
Percent by weight:<br />
Uncrushed Crushed<br />
(A) Material finer than 75 micron I.S. Sieve 3.00 15.00<br />
(B) Shale 1.00 --<br />
(C) Coal and lignite 1.00 1.00<br />
(D) Clay lumps -- --<br />
(E) Total of all above substances including items<br />
(A) to (D) for uncrushed sand and items (C) and<br />
(D) for crushed sand<br />
5.00 1.00<br />
GTS : General Technical Specification. Page 50
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