Measuring Materials for Concrete

The paper deals with those variations in workability, strength, and solidity of concrete from batch to batch, which result from unavoidable variations in the water content and gradations of the aggregates as received for use. It considers especially how the different methods of measuring the ingredients tend to increase or to r educe the difficulties of securing uniform results. The bulking of samples of sand from twenty-two localities when measured by different methods was determined experimentally in order to ascertain the best method of measuring. Briquettes were made with all these sands, using different proportions of cement and water, in order to ascertain how the method of measurement affected the uniformity of the results. Both the strength and the solidity of these briquettes were determined.