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<br />I <br />I B. <br />I <br />I c. <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I D. <br />I <br /> E. <br />I <br />I <br />I F. <br />I <br />I <br />I 04/08 <br /> <br />The Concrete Supplier shall submit through the Contractor to the <br />Engineer for approval the concrete mix he intends to use, designed within <br />the limits of these specifications, listing the brand of cement, source and <br />results of tests of aggregates and admixtures not later than 14 days prior <br />t,.., tho boginning I"'\f plac'lng f"onf"reto <br />LV Lt'''''' '"' 1111111 VI V I _I """. <br /> <br />The limiting strengths, water-cement ratios and cement factors as shown <br />on Table A shall apply. Maximum water-cement (#1#) for structures shall <br />be 0.53 by weight. <br /> <br />TABLE A <br /> <br />Minimum <br />Compo Str. <br />psi at 28 days <br /> <br />Maximum Net <br />Water Content <br />gals/100 Ibs* <br /> <br />Minimum <br />Cement Factor <br />100 Ibslcu yd** <br /> <br />2500 <br />3000 <br />3500 <br />4000 <br /> <br />7.4 <br />7.0 <br />6.4 <br />5.85 <br /> <br />4.3 <br />4.8 <br />5.64 <br />5.64 <br /> <br />*Maximum; decrease if possible. This represents total water in mix at <br />time of mixing, including free water on aggregates, and water in admixture <br />solution. <br /> <br />**Minimum; increase as necessary to meet other requirements. These <br />cement factors apply to "controlled" concrete subject to specific <br />inspection. <br /> <br />When high-early-strength portland cement is permitted, the same strength <br />requirements shall apply except that the indicated strengths shall be <br />attained at seven (7) days instead of twenty-eight (28) days. <br /> <br />If, during the progress of the work, it is impossible to secure concrete of <br />the required workability and strength with the materials being furnished, <br />the Engineer may order such changes in proportions or materials, or both, <br />as may be necessary to secure the desired properties. All changes so <br />ordered shall be made at the Contractor's expense. <br /> <br />If, during the progress of the work, the Contractor desires to use materials <br />other than those originally approved, or if the materials from the sources <br />originally approved change in characteristics, the Contractor shall, at his <br />own expense, have made new acceptance tests of aggregates and <br />establishment of new basic mixtures and submit them to the Engineer for <br />approval. <br /> <br />03300-3 <br /> <br />06-5723 <br />