This work shall consist of the construction of all or portions of structures of Portland cement concrete, of the required grade or grades, with or without reinforcement, and with or without admixture, constructed in accordance with these Specifications and the lines, levels, grades, and dimensions shown on the Drawings, and as required by the Employer's Representative.
Portland cement concrete shall consist of a mixture of Portland cement, water, and coarse and fine aggregate with or without admixture.
1.2 Concrete Mix Design
1.2.1 Grade of Concrete
The grade of concrete to be used in each part of the structure shall be as described on the Drawings.
1.2.2 Constituents of the Concrete Mix
The Contractor shall design the concrete mixes and submit his proposal for the approval of the Employer's Representative. The concrete shall conform to the requirements for the particular grade as set out in table below. The cement in any mix shall be within the limits contained in Table 4.1-1.
1.2.3 Grading of Aggregates
The grading of the aggregates shall be within the limits as specified in Sub-Clause 2.1.2 of this Specification. Once the appropriate gradings have been determined and approved. They shall not be varied without the permission of the Employer's Representative.
1.2.4 Water/Cement Ratio