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This paper presents data on the strength and load-supporting properties of two substandard granular materials when treated with various quantities of cement and subsequently subjected to freezing-and-thawing action.
Tests were made both in the laboratory and in the field. Laboratory test results are presented in terms of bearing values and soniscope velocities on continuously moist-cured specimens and on companion specimens subjected to freezing-and-thawing cycles. Compressive strength and soniscope data are given on continuously moist-cured specimens. Field test results are given in terms of load-supporting values of the untreated and cement-treated materials. These values were obtained from load tests performed with a 12-in. diameter plate on 36 test panels 4 ft square. The panels were 4, 7 and 10 in. thick and the cement factor varied from 1.5 to 10 per cent. Tests were made over a 5-yr period.
The results show that an increase in cement content is accompanied by an increase in the durability and strength of the materials. There was little or no effect due to frost action on mixtures containing sufficient cement to be classified as hardened soil-cement. Freezing-and-thawing action had a detrimental effect upon mixtures which contained less cement than required to meet criteria based upon results from ASTM freezing-and-thawing and wetting-and-drying tests for hardened soil-cement. However, in all cases the capacity to support load of the cement-treated materials was greater than that of the untreated materials.
Abrams, Melvin S.
Engineer, Research and Development Laboratories, Portland Cement Assn., Skokie, Ill.