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Effect Of Varying Temperatures On Chemical And Mechanical Properties Of Expansive Clay

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Author: 
Charles K. Kabubo, Sylvester O. Abuodha, Zachary A. Gariy and Sixtus K. Mwea
Abstract: 

Due to their physical and chemical structure, expansive soils undergo alternate swelling and shrinkage when the soil moisture changes. This causes all types of structures and pavements built on them to undergo severe distress, resulting in damage to them and high rehabilitation costs. There are many methods of improving such soils. This research studied the effect of thermal stabilization on the chemical and mechanical characteristics of a naturally occurring black cotton spoil, an expansive clay. The thermal treatment involved heating the soil in temperatures ranging from 200 to 12000C for 2 hours in a closed kiln, and then carrying out the tests on the neat and heated samples so as to obtain the effect of varying temperatures on the soil. The oxides content changed upon heating but remained fairly constant irrespective of temperature, while the organic matter content remained below the upper limit of 5%. The compaction properties, the CBR and CBR swell improved with increased temperature, giving acceptable results for 6000C and 7000C, with the best results at 7000C. Beyond 7000C, the soil collapsed and cannot be used as fill material.

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