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C. The limiting strengths, water - cement ratios and cement factors as shown on Table A shall apply. Maximum water - cement ( # / #) for ' structures shall be 0.53 by weight. TABLE A 1 Minimum Maximum Net Minimum * *Minimum; increase as necessary to meet other requirements. These cement factors apply to "controlled" concrete subject to specific inspection. tD. When high - early- strength portland cement is permitted, the same strength requirements shall apply except that the indicated strengths ' shall be attained at seven (7) days instead of twenty -eight (28) days. E. If, during the progress of the work, it is impossible to secure concrete of the required workability and strength with the materials being furnished, the Engineer may order such changes in proportions or materials, or both, as may be necessary to secure the desired properties. All changes so ordered shall be made at the Contractor's expense. ' F. If, during the progress of the work, the Contractor desires to use materials other than those originally approved, or if the materials from the sources originally approved change in characteristics, the Contractor shall, at his own expense, have made new acceptance tests of aggregates and establishment of new basic mixtures and submit them to the Engineer for approval. G. Consistency of the concrete as measured by the ASTM Designation 1 C143 shall be as shown in Table B. 1 07/03 03300 -3 03- 3148.A Comp. Str. Water Content Cement Factor psi at 28 days gals /100 Ibs* 100 lbs /cu yd 2500 7.4 4.3 3000 7.0 4.8 3500 6.4 5.64 4000 5.85 5.64 *Maximum; decrease if possible. This represents total water in mix at time of mixing, including free water on aggregates, and water in admixture solution. * *Minimum; increase as necessary to meet other requirements. These cement factors apply to "controlled" concrete subject to specific inspection. tD. When high - early- strength portland cement is permitted, the same strength requirements shall apply except that the indicated strengths ' shall be attained at seven (7) days instead of twenty -eight (28) days. E. If, during the progress of the work, it is impossible to secure concrete of the required workability and strength with the materials being furnished, the Engineer may order such changes in proportions or materials, or both, as may be necessary to secure the desired properties. All changes so ordered shall be made at the Contractor's expense. ' F. If, during the progress of the work, the Contractor desires to use materials other than those originally approved, or if the materials from the sources originally approved change in characteristics, the Contractor shall, at his own expense, have made new acceptance tests of aggregates and establishment of new basic mixtures and submit them to the Engineer for approval. G. Consistency of the concrete as measured by the ASTM Designation 1 C143 shall be as shown in Table B. 1 07/03 03300 -3 03- 3148.A