SYMPOSIA PAPER Published: 01 January 1957

Strength and Elastic Properties of Compacted Soil-Cement Mixtures


Representative data are presented in this report on modulus of rupture, modulus of elasticity, Poisson's ratio, and compressive strength of several soil-cement mixtures. The modulus of elasticity was obtained by the sonic method and by static methods in bending and in compression. The effect of size and shape of specimen on compressive strength was explored. Methods are described for molding uniformly densified 3 by 3 by 11 1/4-in. beams for flexure tests, and 2.8-in. diameter by 5.6-in. high cylinders for compression tests; methods are also described for measuring deflections in beams when loaded in flexure, and for measuring axial and transverse deformations in cylinders when loaded in unconfined compression. The effects of type of soil, cement content, and length and type of curing on the structural properties are shown. Four soils of different gradation were included. Cement additions ranged from 3 to 18 per cent by weight of soil (4 to 19 per cent by volume). The strength and modulus of elasticity of all soil-cement mixtures increased with an increase in cement content and with an increase in moist curing time. Compressive strengths of moist-cured, and moist-tested specimens ranged from less than 200 to more than 2500 psi; the modulus of rupture, which averaged 20 per cent of the compressive strength, ranged from 50 to 480 psi; the static modulus of elasticity in flexure, which was approximately equal to the dynamic modulus, ranged from 800,000 to more than 4,000,000 psi; and the static modulus of elasticity in compression, which was equal to 60 to 75 per cent of the modulus in flexure, ranged from less than 500,000 to about 3,000,000 psi.

Author Information

Felt, Earl
Portland Cement Assn., Chicago, Ill.
Abrams, Melvin
Portland Cement Assn., Chicago, Ill.
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Developed by Committee: D18
Pages: 152–178
DOI: 10.1520/STP45850S
ISBN-EB: 978-0-8031-6745-2
ISBN-13: 978-0-8031-6551-9