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' 1.07 ACCEPTANCE TESTS <br />A. Conformity of aggregates to these Specification, and the actual <br />proportions of cement, aggregates, and water necessary to produce <br />concrete conforming to the requirements set forth in Table A, shall be <br />determined by tests made with representative samples of the materials to <br />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 testing to determine that it conforms to the <br />requirements of this Specification. Methods of testing shall conform to the <br />appropriate specification, but the place, time, frequency and method of <br />' sampling will be determined by the Engineer in accordance with the <br />particular need. <br />C. Water content of the concrete shall be based on a curve showing the <br />relation between water content and 7 and 28 -day compressive strengths <br />of concrete made using the proposed materials. The curves shall be <br />determined by four or more points, each representing an average value of <br />at least three test specimens at each age, and shall have a range of <br />values sufficient to yield the desired data, including all the compressive <br />strengths called for on the Drawings, without extrapolation. The water <br />content of the concrete to be used, as determined from the curve, shall <br />correspond to the test strengths of the laboratory trial mixtures as shown <br />on Table D. <br />TABLE "D" <br />Design Min. Lab. <br />Strength <br />Strength 7 Days* <br />28 Days ** <br />3000 2500 <br />3500 <br />3500 3000 <br />4100 <br />4000 3500 <br />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 values <br />for maximum water - cement ratios and minimum cement contents as <br />specified in Table A. <br />December 2006 03300 -5 06 -5723 <br />