particular specifications (road works) - CIDCO Maharashtra Ltd.

CIDCO OF MAHARASHTRA LTD
C.A.No.01/CIDCO/SE(KHR)/EE(KHR-I)/2010–11 Pg. No. 360
ii) After 28 days of curing, test specimen will be fitted in a machine
such that the specimen can be placed in water under pressure
upto 7 bars. The typical machine shall be similar to one shown
in Appendix 1700/II of MORT&H 4th revision, 2001 reprint.
iii) At first a pressure of one bar is applied for 48 hours, followed by
3 bars for 24 hours and 7 bars for next 24 hours.
iv) After the passage of the above period, the specimen is taken out
and split in the middle by compression applied on two round
bars on opposite sides above and below.
v) The water penetration in the broken core is measured with scale
and the depth of penetration assessed in mm (max permissible
limit 25mm)
5.9.0 ACCEPTABILITY CRITERIA
5.9.1 Concrete Cubes
5.9.1.1 The strength requirement of any particular grade of concrete will be
considered satisfactory if the 28 day’s compressive strengths of
individual sets (each set consists of 3 cubes) and of individual cubes
satisfy the requirements as per IS: 456-2000, Clause No.16:
Acceptance Criteria.
5.9.1.2 Whenever a mix is redesigned due to a change in the quality of
aggregates or cement or plasticiser or for any other reason, it shall be
considered as a new mix and initially subject to the acceptability
criteria.
5.9.1.3 If the concrete produced at site does not satisfy the above strength
requirements, the Engineer will reserve the right to require the
Contractor to improve the methods of batching, the quality of the
ingredients and redesign the mix with increased cement content if
necessary. The Contractor shall not be entitled to claim any extra cost