EXPERIMENTAL STUDY OF STABILIZED EXPANSIVE SOIL USING PUMICE MIXED WITH LIME FOR SUBGRADE ROAD CONSTRUCTION

Robel Tewelde Mesfun; Emer Tucay Quezon; Anteneh Geremew

doi:10.29121/granthaalayah.v7.i7.2019.736

Authors

Robel Tewelde Mesfun Civil Engineering Department, Dire Dawa Institute of Technology, Dire Dawa, Ethiopia
Prof. Emer Tucay Quezon Civil & Construction Engineering and Management Streams, Institute of Technology, Ambo University, P.O Box. 019, Ambo, Oromia Region, Ethiopia
Anteneh Geremew Highway Engineering Stream, Jimma Institute of Technology, Jimma University, Ethiopia

DOI:

https://doi.org/10.29121/granthaalayah.v7.i7.2019.736

Keywords:

Expansive Soil, Lime, Plastic Clay Soil, Pumice, Stabilization Methods

Abstract [English]

Unsuitable soil materials along the alignment of road projects have a significant influence on planning, design, construction, and maintenance. Expansive soils are susceptible to considerable volume changes due to seasonal variations and moisture content. Most soils found in Jimma and Ambo Zones composed of plastic clay soil, causing severe damage at the intermittent of pavement sections. This research study conducted laboratory investigation considering combinations of materials blended to stabilize the expansive soil for subgrade construction. An experimental type of study performed which started by collecting specimens. Two clayey soil specimens considered to test the free swell index obtained from a depth of 1.5m to remove the organic impurities. Results indicated the chemical analysis of pumice contained 82.68%, while its physical properties of the test of fineness specific surface and residue on 45 microns showed 3770 cm²/gm and 30%, respectively. As the lime content increased, the CBR strength also increased. But, if the percent content of lime decreased with an increasing pumice content, the CBR value did not show any significant increase. Both the chemical and physical properties satisfied the requirements according to ASTM C-618. Hence, this experiment obtained 7% lime + 3% pumice as an optimum mix ratio to stabilize expansive soils.

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