HIGH GRADE CONCRETE. (1) It shall be controlled concrete. (2) The mix of tI){: ingredients shall be decided at the time of execution of the work to arrive at the densest concrete. (3) The minimum strength of the concrete as specified shall be obtained. (4) Preliminary tests shall be made prior to the commencement of the work. (5) Daily and whenever the materials or the mix, is changed, at least two cylinders shall be tested. and in addition at least one consistency test carried out. (6) The minimum cement content shall be as per the mix adopted. (7) The concrete shall be mixed for a period of not less than two minutes in the mixer. This should be read along with Clause 10-16.
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