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This paper reports test results to be used as a basis for the preparation of a Federal specification for high-early-strength cement. Samples of 28 commercial cements were investigated. The cements represented a wide spread in compound composition, fineness, and physical properties. Four plastic mortars were studied. Both the tensile and compressive strength (2-inch cubes) of each of these mortars varied with the different cements over a considerable range. The rate of setting of these cements was measured by the penctration of 300-g needles, one 1 mm in diameter and one 2 mm in diameter, into the mortars contained in a Vicat ring. Measurements of length changes were made on 6-inch prisms 1 inch square cured under four different conditions. The requirements for a specification for high-eady-strength cement are discussed and recommendations made for tests to be incorporated into such a specification.

A study for the preparation of a specification for high-early-strength Portland cement