Mineralogy of Compacted Clay-Lime Mixtures
1981
Sabry, M. A. | Reed, Lester W. | Parcher, J. V.
The objective of this study was to determine whether differences in sample preparation and curing conditions of soil-lime mixtures lead to distinguishable mineralogical differences in the reaction products. Two Oklahoma soils of different mineralogical compositions were used in the study. Lime content, water content, curing time, and curing environment were the controlled variables. The X-ray diffractometer and scanning electron microscope were used to examine intact compacted specimens and determine the nature of the reaction products (cementing minerals) formed under various conditions. Both calcium silicates and calcium aluminates were formed by the reaction between calcium hydroxide and clay. The aluminates prevailed in the samples tested. High water contents act to diffuse the lime more uniformly in the soil, leading to more nearly homogeneous properties of the stabilized mass. In one of the soils, the formation of a mineral-like ettringite may have had an adverse effect on the development of soil strength.
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