Name of Work Na - e-Tendering

86 Dy. E. E.
ANNEXURE I
SPECIFICATION
Item: Providing and casting in situ M-20 grade (controlled) cement concrete trap metal of approved quality for RCC slab at desired places
as per detailed designs and drawings or as directed including Centring, form work, compaction, finishing the formed surfaces with cement
mortar of sufficient minimum thickness to give a smooth and even surface including niroo finish wherever necessary or roughening them if
special finish is to be provided (excluding reinforcement) and curing etc. complete.
The item refers to controlled cement concrete required for RCC terrace slab and such other slabs in building construction and is to be
executed as per detailed specification enclosed.
The salient and specific points in the specifications are as follows:
i) Water cement content shall not exceed 0.42.
ii) Minimum cement content shall not be less than 350 Kg. per cubic meter.
iii) Admixture such as water reducing admixtures / Air entraining admixtures and super plasticizer of proprietary product like melamine
based supercon - 100 etc. to improve workability, durability and to reduce permeability, considering the restrain in W/C ratio.
iv)Maximum size of aggregate shall not be exceed 20 mm.
v) Provision of cover blocks of the same strength of the concrete and manufactured to the specified dimension of the other approved
construction material such as plastic at 30 cm. centre to centre.
vi) Compaction shall necessarily be done by Mechanical Vibrators such as screwed vibrators.
vii) Placement of Plastic paper or polythene sheet on Centring before placing concrete mix.
Contractor No. of correction Executive Engineer