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. 354
TABLE - 2
Sr.
No.
Area of Concrete work Slump mm
1a Structure with exposed inclined surface requiring low slump 25
concrete to allow proper compaction
1b Plain C.C. 25
2 R.C.C. structure with widely spaced reinforcements i.e. solid
columns, piers, abutments, footings, well-steinings
3 R.C.C. structures with fair degree of congestion of
reinforcement. Viz. pier and abutment caps, box culvers, weil
curbs, well caps, wall with thickness greater than 300mm
4 R.C.C. and PSC structures, with highly congested
reinforcement viz deck slab, girders box girders, wall with
thickness less than 300mm.
5 Under water concreting through tremie, bottom plug, cast in
situ piling
40 to 50
50 to 75
75 to 125
100 to 200
6 Cast in situ piling work using tremie pipe 100 to 180
Note:
1. The slump of structure concrete with water will be 25mm (Max). Any
slump in excess of 25mm, shall be obtained by adding suitable dose of
approved super plasticizer.
2. In case of pumped concrete the slump requirement may be kept as per
RMC mix design. Excess slump (above 25mm) shall be obtained by
adding suitable dose of approved admixture/plasticiser.
The mixes are designed to yield mean strengths (f’ cm) greater than the
corresponding specified characteristic strengths (f’ ck) as indicated in
Table 1. The difference between f’ cm and f’ ck is called the ‘Current
Margin’. The concrete mixes shall be designed on the basis of required