Abstract
This paper describes the effects of geomaterials on unconfined compressive characteristics of foamed mixture lightweight soils, utilizing clay (kaolin clay), silt and coal ash as geomaterials. The effects of geomaterials and curing time on stress-strain behavior of foamed mixture lightweight soils are shown quantitatively. The unconfined compressive strength of foam mixture lightweight soils can be represented as a hyperbolic relationship between unconfined compressive strength and curing time. Several empirical relationships have been also developed. These properties show that coal ash is more effective than clay and silt when used in foamed mixture lightweight soils as a construction material.
