INVESTIGATION OF PARTIALLY COMPACTED WEIGHT OF CONCRETE AS A MEASURE OF WORKABILITY. REPORT 1. PRELIMINARY TESTS.
ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MISS
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Apparatus for performing the compacting-factor test as described in British Standard 18811952 was constructed, and two series of tests were made to determine the degree to which variation in partially compacted weight of concrete specimens can be used as a measure of workability. In the first series of tests a number of batches of each of two concrete mixtures having 1-12- and 2-12-in. slumps, respectively, were tested. In the second series the water content of a nominal 2-in.-slump mixture was varied to give seven mixtures with slumps ranging from 0 to 8 in. It is concluded that the net, struck, partially compacted weight of concrete in a suitable mold, filled by discharge to overflowing in a standard manner, could form the basis of control of workability in the laboratory or in the field, provided the concrete has a slump that does not normally exceed 3 in. Author
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