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Current methods of determining the specific gravity, moisture content, and absorption of concrete aggregates (ASTM Test Method for Specific Gravity and Absorption of Coarse Aggregate [C 127], ASTM Test Method for Specific Gravity and Absorption of Fine Aggregate [C 128], and ASTM Test Method for Total Moisture Content of Aggregate by Drying [C 566]) are slow and dependent upon subjective “end-point” determinations as well as requiring elaborate and cumbersome equipment. Presented here is a method using simple equipment, the siphon can, to accomplish all three tests. This technique has an objective “end-point” and statistical error of measurement one-quarter that of ASTM C 127 or C 128. Derivation of formulae and method of application are discussed. The use of this technique in routine concrete production can result in large savings to concrete producers.
Materials scientist, The CONPRO Co., Spanway, WA
Stock #: CCA10053J