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covcrcd under 2.1 to 2.3. definitions shall apply. cnvcring
of terms rclatir)S co aggreThe standard
will include Aggregate most of which passes 4.75-mm
2.1 Fine Aggregatcand contains only so much coarser material as permitted
in 4.3. IS Sieve 2.1.1 JVuttrral Sand - Fine aggregate resulting from the natural disintegration
of rock and which has been deposited
2.1.2 Crushed Stone Sand - Fine aggregate
2.1.3 Crushed Grace1 Sand - line
natural gravel. . 2.2 Coarse Aggregate
-- Aggregate most of which is retained on 4*75-mm
IS Sieve and containing
only so much finer material
as is permitted
the various types described
in this standard.
NOTE -Coarse aggregate a) uncrushcd
rock, may gravel b) crushed
stone, and or stone c) partially
uf (a) and (b). All-in-Aggregate
aggregate. 2.3 3. QUALITY - be described or stone gravel l\Iaterial which when as:
results it results or stone when composed from
crushing it is a product disintegration
of the of fine aggregate of or hard
blending and coarse- OF AGGREGATES 3.1 General - r1ggrcgntc shall consist of naturally
( crushed or
) stones, gravel and sand or combination
be harcl, strong, ~CIISC, dural)lc, clear and free from veins and adherent
coating; and tiee from irrjurious amounts
matter and otlicr deleterious
As far as possible, .
and clongatccl pieces should be avoided.
5 : :I.. TS : 383 - 1970
shall not contain any harmful
:li;lt~.l~iai, such as pyrites, coal, lignite, mica, shale or similar laminated
material, clay, alkali, soft fragments,
sea shells and organic impurities in
as to affect
of the concrete.
to. be used for reinforced
shall not contain any
mater:aI liable to attack the steel reinforcement.
reactive with alkalies of cement are harmful as cracking
concrete may take place.
SITE - Aggregates petrographically similar to known reactive types or aggrecates
wllich, on the basis of service history or laboratory exprriments, are suspected to haxve
reactive tendency sholdd be avoided or used only with cements of low alkalies [not
morr than 0.6 percent as sodillm oxide ( iKa,O )]. after detailed lnboracrwy stllclies.
uw of pozzolanic cement and certain pozzolanic admixtures may be helpful in controlling alkali aggregate reaction.
deleterious materials shall not rxce,cd the limits specified in Table 1 when
tested in accordance
with IS : 2386-1963.
However, the erqineer-in-charge
at his discretion, may relax some of the limits as a result of-some fLtrrher
tests and evidence of satisfactory performance
of the aggregates. 3.3 Aggregate
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- Fall '13