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Unformatted text preview: one and near the border of another does not
Mince withdrawn 3 remain consistently
in one zone but fluctuates between the two.
therefore, desirable to choose a suitable ratio of fine to coarse aggregate
proportions of the concrete to allow some fluctuations
in the grading zone
of the Ane aggregate.
0.31 The four grading zones indicated in this standard are meant to
cover the use of the natural sands available in the country.
It is, however,
necessary to appreciate the limitations in either using a very coarse sand
or a very fine sand and the need to make suitable changes in the mix
have shown that the bulk density is affected by the size
of the container used to determine it.
Secondly there is an increasing
tendency to batch concrete by weight rather than by volume.
in 1963 version of the standard, the provisions regarding bulk density have
not been included.
0.5 Whilst the requirements specified in this standard generally meet the
for most of the concrete works, there might be special
cases where certain requirements other than those specified in the standard might have to be specified; in such case, such special requirements,
the test required and the limits for such tests may be specified by the
of test for aggregates
to IS: 2386 (Part VIII)-19631
adjuncts to this standard.
For sampling of aggregates, reference may be
made to IS : 2430-1969.
0.7 This standard contains clauses 3.2.1, 3.4, 3.5, 6.2, 6.3 and 6.4 which
call for agreement
and supplier and requires
supplier to furnish technical information as given in Appendix A.
0.8 Titles of standards referred
are given in Appendix B. to in the various clauses of this standard 0.9 For the purpose of deciding whether a particular requirement of this
with, the final value,
shall be rounded
expressing the result of a test or analysis,
accordance with IS : Z-1960.
The number of significant places retained in
the rounded off value should be the same LU that of the specified value in
1.1 This standard
covers the requirements
uncrushed, derived from natural sources, such as river terraces and riverbeds, glacial deposits, rocks, boulders and gravels, for use in the Production
of concrete for normal structural purposes including mass concrete works.
4 rS : 383 - 1910
1.1 ‘Tltis slnndard
derived I’rom natural sources, such as river terraces and riverbeds, glacial
l~oulders and gravels, for use in the production c,l’ concrete
2.0 For the purpose o> this standard,
KIWI.:- A comprchcnsi~v2 ‘s:antlard the following g~1tc.s fur concrctc
is under preparation.
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This document was uploaded on 10/01/2013.
- Fall '13