CIVIL WORKS MIXED IN UNDERGROUND CALE LINE

Normal Reinforced Concrete-Class-A

Concrete for normal reinforced concrete work shall comply with requirements of the British Standard Code of practice for the structural use of normal reinforced concrete in buildings CP 8110a minimum cement content of 360 kg/m3

Batching of Concrete

The means of batching and control of quality of concrete shall be approved by the Engineer.

Mortar and Grout

Mortar and grout shall comply with BS 5625.


Strength of Mixes

The cement aggregate and water for concrete work shall be mixed in such proportions as to comply with the following table in which the expression ‘Works Test’ and ‘Preliminary Test’ shall have the meanings ascribed to them in BS 1881 ‘Methods of Testing Concrete.’

Nominal Mix
Minimum Cube Strength Requirements in N/mm2

Works Tests at 7 days
Preliminary Tests at 28 days
Works Test at 28 days
Class-A
14.0
(2000 lbs sq.in)
28.0
(4000lbs sq.in)
21.0
(3000lbs sq.in)
 
Water Cement Ratio
The quantity of water is to be the minimum necessary to ensure a workable and compact mass. Due allowance shall be made for the moisture content of the available aggregates and the Contractor must ensure that the water/cement ratio is not excessive and produces concrete to the strength requirements. The Water/cement ratio shall not exceed 0.55inc any case.

Minimum Quantity of Cement
Class A- Any reinforced concrete to be used in the Works shall contain not less than 360kg of cement in each cubic meter of concrete.


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