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F <br />J. The entrained air, as measured by the Pressure Method, ASTM C231, shall <br />be as shown in (Table C). <br />TABLE C <br />Nominal Maximum Size <br />of Coarse Aggregate(in) <br />2'f <br />1" <br />3/4" <br />1.07 ACCEPTANCE TESTS <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />a,os <br />Total Air Measured at <br />Discharge from truck ( %) <br />2.5-5.5 <br />6.5 <br />4.0-8.0 <br />A. Conformity of aggregates to these Specification, and the actual proportions <br />of cement, aggregates, and water necessary to produce concrete <br />conforming to the requirements set forth in Table A, shall be determined by <br />tests made with representative samples of the materials to be used on the <br />work. Tests will be made by an accredited testing laboratory, and approved <br />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 of <br />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 values <br />sufficient to yield the desired data, including all the compressive strengths <br />called for on the Drawings, without extrapolation. The water content of the <br />concrete to be used, as determined from the curve, shall correspond to the <br />test strengths of the laboratory trial mixtures as shown on (Table D) below. <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 />03300 -4 <br />03- 4138.0 <br />TABLE D <br />Design <br />Min. Lab. <br />Strength <br />Strength <br />7 Days* <br />28 Days ** <br />3000 <br />2500 <br />3500 <br />3500 <br />3000 <br />4100 <br />4000 <br />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 />03300 -4 <br />03- 4138.0 <br />