Laserfiche WebLink
C. The limiting strengths, water - cement ratios and cement factors as <br />shown on Table A shall apply. Maximum water - cement ( # / #) for <br />structures shall be 0.53 by weight. <br />aTABLE A <br />' <br />Minimum Maximum Net Minimum <br />Comp. Str. Water Content Cement Factor <br />' <br />psi at 28 days gals /100 Ibs* 100 lbs /cu yd ** <br />2500 7.4 4.3 <br />3000 7.0 4.8 <br />3500 6.4 5.64 <br />4000 5.85 5.64 <br />I*Maximum; <br />decrease if possible. This represents total water in mix at <br />time of mixing, including free water on aggregates, and water in <br />' <br />admixture solution. <br />* *Minimum; increase as necessary to meet other requirements. These <br />' <br />cement factors apply to "controlled" concrete subject to specific <br />inspection. <br />' <br />D. When high - early- strength portland cement is permitted, the same <br />strength requirements shall apply except that the indicated strengths <br />shall be attained at seven (7) days instead of twenty -eight (28) days. <br />E. If, during the progress of the work, it is impossible to secure concrete <br />of the required workability and strength with the materials being <br />furnished, the Engineer may order such changes in proportions or <br />materials, or both, as may be necessary to secure the desired <br />' <br />properties. All changes so ordered shall be made at the Contractor's <br />expense. <br />iF. If, during the progress of the work, the Contractor desires to use <br />materials other than those originally approved, or if the materials from <br />the sources originally approved change in characteristics, the <br />Contractor shall, at his own expense, have made new acceptance <br />tests of aggregates and establishment of new basic mixtures and <br />submit them to the Engineer for approval. <br />G. Consistency of the concrete as measured by the ASTM Designation <br />C143 shall be as shown in Table B. <br />07/03 03300 -3 03- 3148.A <br />