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r <br />t <br />t <br />I <br />r <br />determined by tests made with representative samples of the materials <br />to be used on the work. Tests will be made by an accredited testing <br />laboratory, and approved by the Engineer. <br />B. Cement may be subject to n to Methods of testing shall onfohm <br />requirements of this Speci ficatio <br />to the appropriate specification, but the place, time, frequency and <br />method of sampling will be determined by the Engineer in accordance <br />with the particular need. <br />the <br />C. Water content of the concrete <br />ccontent shall a d based sandn 28 day compressive <br />reation between water <br />strengths of concrete made using the proposed materials. The curves <br />shall be determined by four or more points, each representing an <br />average value of at least three test specimens at each age, and shall <br />have a range of values sufficient to yield the desired data, including all <br />the compressive strengths called for on the Drawings, without <br />extrapolation. The water content of the concrete to be used, as <br />determined from the curve, shall correspond to the test strengths of <br />the laboratory trial mixtures as shown on Table D. <br />TABLE "D" <br />Design Min. Lab. Strength <br />Strength 7 Days* 28 Days* <br />3000 2500 3500 <br />3500 3000 4100 <br />4000 3500 4600 <br />* May be employed by preliminary design. <br />* * To be used for final designs. <br />E. In no case, however, shall the resulting mix conflict with the limiting <br />values for maximum water - cement ratios and minimum cement <br />contents as specified in Table A. <br />PART 2 - PRODUCTS <br />2.01 MATERIALS <br />A. Materials shall conform to these Specifications and any state or local <br />specification requirements. <br />B. Cement for all cast in place concrete shall be a domestic portland <br />cement (ASTM C -150, Type ll) or high early strength portland cement <br />09/03 <br />03300 -5 03- 3148.A -R <br />