Abstract
The effect of British Standard Light (BSL), West African Standard (WAS) and British standard Heavy (BSH) compactive efforts on the strength indices oflaterite treated with 2, 4, 6 and 8 % calcium carbide waste (CCW) was studied. Atterberg’s limits test, compaction test, California bearing ratio (CBR) and unconfined compressive strength (UCS) tests were performed on laterite treated with CCW. Unconfined compressive strength and California bearing ratio values of Ikpayongo laterite used as strength indices increased with higher compactive effort and CCW content. CBR value of the natural laterite increased from 10 %, 17 % and 18 % to peak values of 23.0 % 47 % and 50 % respectively, when treated with8 % CCW, using BSL, WAS and BSH compactive effort respectively. 7 day UCS values of the natural laterite using BSL, WAS and BSH compactive efforts increased from 397, 620 and 640 kN/m 2 to peak values of 1450, 1456 and 1457kN/m 2 , respectively, when treated with 8 % CCW. Results of tests showed that compactive effort have effect on strength indices of laterite treated with CCW. The WAS compactive effort was recommended for use as the most economic compactive effort in the treatment of laterite with CCW for use in road work. Outcome of the study will provide a useful guide in the use of CCW for road work.
Highlights
Laterite, a sedimentary rock deposit arising from the weathering of rocks, is one of the most common and readily available road building materials that can be sourced locally in Nigerian
The liquid limit of Ikpayongo laterite decreased with calcium carbide waste (CCW) content while the plastic limit increased with CCW content resulting in decrease in plasticity index, as the plasticity index of Ikpayongo laterite decreased from 14 % to 5 %, when treated with 8 %CCW
Maximum dry density of Ikpayongo laterite decreased with CCW content while it increased with higher compactive effort
Summary
A sedimentary rock deposit arising from the weathering of rocks, is one of the most common and readily available road building materials that can be sourced locally in Nigerian. Ikpayongo laterite deposit is located in the Benue trough The Benue trough is conventionally divided into three sections; the lower, Middle and the Upper. The lower section where Ikpayongo laterite deposit is situated is dominated by the Abakaliki anticlinorium. (Ford, 1989) describe laterite found in the Benue trough as a residual weathering product on partially or wholly decomposed basalts and other basic to intermediate igneous rocks Maximum thickness in the lower section estimated by (Cratchley and Jones, 1965) from gravity study probably does not exceed 4300 meters. (Ford, 1989) describe laterite found in the Benue trough as a residual weathering product on partially or wholly decomposed basalts and other basic to intermediate igneous rocks
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