Abstract: Industrial by-product resource is an effective way to solve the environmental pollution of industrial by-product. Clay is stabilized by fly ash mixed with lime or blast furnace slag mixed with lime, respectively. The effects of binder content, curing period on the unconfined compressive strength, pH value, and degree of saturation of treated soils are investigated by a series of laboratory tests. Test results show that the unconfined compressive strength of stabilized soils increases with the increasing of binder content and curing time. A unique negative exponential function well adapts unconfined compressive strength of stabilized soils with a synthetical parameter, which represent the effect of binder content, curing period and degree of compaction. Fly ash mixed with lime or blast furnace slag mixed with lime can effectively enhance soil unconfined compressive strength properties. Lime is an effective alkaline activating agent, and the highly alkaline environment resulted from the lime can provide pozzolanic reaction conditions for industrial by-product. These results can provide a test basis for the design of stabilized soils by industrial by-product binders.

Key words: stabilized soils, industrial by-product, unconfined compressive strength, synthetical parameter, pH value