Geotechnical Properties of Makurdi Shale Treated with Bamboo Leaf Ash

Authors

  • Amos Yala Iorliam Department of Civil Engineering, University of Agriculture P.M.B. 2373, Makurdi, Benue State, Nigeria
  • Peter Okwu Department of Civil Engineering, University of Agriculture P.M.B. 2373, Makurdi, Benue State, Nigeria
  • Terhide Jeremiah Ukya Department of Civil Engineering, University of Agriculture P.M.B. 2373, Makurdi, Benue State, Nigeria

Keywords:

Soil improvement, compaction, unconfined compressive strength, Atterberg limits, California bearing ratio, durability tests

Abstract

The study investigated the geotechnical properties of Makurdi shale treated with bamboo leaf ash (BLA). Different percentages of BLA in incremental order of 4% up to 20% by dry weight of soil were added to shale sample. Particle size distribution, Atterberg limits, compaction, unconfined compressive strength (UCS), California bearing ratio (CBR) and durability tests were performed on each combination. X-ray diffraction test was conducted on the natural shale and BLA. The results showed improvement in the plasticity index (PI), UCS and CBR values of the treated soil. The PI decreased from 39.4% to 24%, while 7 day UCS and CBR values increased from 53.52 kN/m2 and 6% to 154.6 kN/m2 and 18%, respectively. Improvements observed in the strength properties of BLA treated shale were below the minimum values specified for road building materials. Hence, it is recommended for use as a modifier, in the stabilization of shale with either cement, lime or other additives for road work.

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Issue

Vol. 16 No. 3 (2013): January 2013

Section

Articles