9Laboratory Exercise #1Tests on Aggregates Used in Portland Cement ConcreteIntroduction:Aggregates typically make up 70-80% of the volume of Portland cement concretes and over 90% ofasphalt concretes. Thus, their properties (such as gradation, size, shape, pore characteristics, surfacetraits, and strength) play important roles in determining the properties of the composite materials inwhich they are to be used. Knowledge of relative density/specific gravity, absorption, unit weight andvoids content are necessary for the proper design of both Portland cement and bituminous concretes.Purpose:The purpose of this laboratory exercise is to introduce the student to some of the geometrical andphysical properties of aggregates, and to the standard test procedures for these properties. Theproperties to be examined include:Fine AggregateSieve Analysis - ASTM C 136Bulk Specific Gravity (Dry) - ASTM C 128Bulk Specific Gravity (SSD) - ASTM C 128Apparent Specific Gravity - ASTM C 128Absorption - ASTM C 128Moisture Content - ASTM C 566Coarse AggregateSieve Analysis - ASTM C 136Bulk Specific Gravity (Dry) - ASTM C 127Bulk Specific Gravity (SSD) - ASTM C 127Apparent Specific Gravity - ASTM C 127Absorption - ASTM C 127Moisture Content - ASTM C 566Dry Rodded Unit Weight - ASTM C 29
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