Volume-IF - JantERmantER

DCPL-K4A02
Newly placed concrete shall be protected by approved means from rain,
sun and wind. Concrete placed below the ground level shall be protected
against contamination from falling earth during and after placing.
Concrete placed in ground containing deleterious substances, shall be
protected from contact with such ground, or with water draining from
such ground, during placing of concrete and for a period of at least three
days or as otherwise instructed by the Engineer. The ground water around
newly poured concrete shall be kept to an approved level by pumping out or
other adequate means of drainage to prevent floatation or flooding. Steps, as
approved by the Engineer, shall be taken to protect immature concrete from
damage by debris, excessive loadings, vibration, abrasion, mixing with earth
or other deleterious materials, etc. that may impair the strength and
durability of the concrete.
As soon as the concrete has hardened sufficiently, it shall be covered either
with sand, polythene sheet, hessian, canvas or similar materials and kept
continuously wet for at least 14 (fourteen) days after final setting. Curing by
continuous sprinkling of water will be allowed if the Engineer is satisfied
with the adequacy of the arrangements made by the Contractor.
If permitted by the Engineer, curing compound like "ANTISOLE (WP)"
may be used for prevention of premature water loss in concrete and
thereby effecting curing of concrete . This type of curing compound shall
be sprayed on newly laid concrete surfaces to form thin film barrier against
premature water loss without disturbances to normal setting action. The
curing compound shall comply with ASTM requirements for acceptance.
The curing compound shall be applied following the final finishing operation
and immediately after disappearance of water sheen from concrete
surface.
It is important not to apply the curing compound when standing water is still
present on concrete.
The contractor shall arrange for the manufacturer's supervision.
The Contractor shall remain extremely vigilant and employ proper equipment
and workmen under able supervision for curing. The Engineer's
decision regarding the adequacy of curing is final. In case any lapse on
the part of the Contractor is noticed by the Engineer, he will inform the
Contractor or his supervisor verbally or in writing to correct the
deficiency in curing. If no satisfactory action is taken by the Contractor
within 3 (three) hours of issuance of such instruction, the Engineer will be
at liberty either to employ sufficient means through any agency to make
good the deficiency and entirely at the discretion of the Engineer.
3.16 Reinforcement
Mild steel round bars, cold twisted and deformed bars as medium tensile
or high yield strength steel, plain hard drawn steel wire fabric etc., will be
(PCA.774.S034sca2) V.II-D2/S-III : 25