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Knowledge or record of performance of material actual practice. The result of test made to supply data on performance
Two Sources in Selection of Materials
Igneous Rocks. Sedimentary Rocks. Metamorphic Rocks
Classification of Rocks
Proportion of water used. Degree of Mixing. Methods of Testing and the Age at which tests are carried out. Grading of Sand Aggregate. Curing Condition
Principal Factors That Affect the Strength of Concrete
Considerations of economy. Interrelationships of cement content, Water Cement Ratio, and Gradation of Aggregate. Requirements as to placing. Required Strength. Quality of Concrete necessary to satisfy the conditions of exposure
The Principal Factors that Must be Considered in Proportioning Concrete