Volume-IF - JantERmantER

2.5.5 Admixture
DCPL-K4A02
In case of doubt regarding development of strength , the suitability of
water for making concrete shall be ascertained by compressive strength and
initial setting time tests as per method of tests in accordance with the
requirements of IS-516 & IS- 4031 respectively. The PH value of water
shall generally be not less than 6.
Only admixture of approved quality will be used when directed or permitted
by the Engineer . The different types of admixtures which may be
necessary to satisfy the concrete mix and the design requirement shall be as
per the following I.S. Standards :
IS : 2645 - Integral cement water proofing compound
IS : 9103 - Indian standard specification for Admixtures for
Concrete or equivalent American Codes (ASTM C494
and ASTM C260 ) or British Codes ( BS 5075 , Part
1 to 3 ) and may be one of the following :
a) Accelerating admixtures :
- Set accelerating admixtures like "Sigunit Powder" or
"Sigunit LN10" .
b) Retarding admixtures :
- Modified ligno sulphonate based set retarding concrete
admixture like , "Plastiment R".
c) Water reducing admixtures :
- Modified sulphonated melamine formaldehyde based water
reducing concrete admixture like, "Sikament" .
d) Air entraining admixtures :
- Modified ligno sulphonate based air entraining concrete
admixture like "FLOMO AEP " or surface - active agents
like "Sika AER".
(PCA.774.S034sca2) V.II-D2/S-III : 7