Soil-Water Charateristics of Tropical Clay Soil under High and Low Suction Conditions

Abstract

Tropical clay soil was compacted at different moisture conditions (dry, wet and optimum) and compactive efforts (Reduced proctor, Standard proctor, West African standard and Modified proctor). Experimental Soil-Water Characteristics (SWC) of the soil was derived using the pressure plate extractor equipment and SWC Curves (SWCC) plotted as gravimetric water content versus logarithm of matric suction. The Air Entry Values (A.E.V) obtained from experimental work ranged from 21 kPa to 59 kPa and compared favourably well with those estimated from predictive models with values of 23 kPa to 52 kPa. Specimens compacted with greater compactive effort (Modified proctor) and at optimum moisture content produced the largest air entry value of 59 kPa and reduced air voids. Changes observed in the shape of the SWCC were consistent with changes in pore size which occurred by varying compaction conditions. The shape of the soil-water characteristics curve was found to depend on the soil structure, compactive water content and compactive effort and not solely on the percentage of fine particles.

Effect of Stabilization on Failure Susceptibility of Oshogbo-Iwo Road in South-Western Nigeria

“…A number of researchers (Ola et al, 2009;Oluyemiayibiowu et al, 2016;Owolabi and Ola, 2014;Quadri et al, 2018, Ola et al, 2019Oluyemi-ayibiowu et al, 2020;Ola et al, 2020) have investigated the road in order to investigate the cause but also provide a solution to the road's incessant failure. Oyelami and Alimi (2015) also investigated the possible causes of the persistent failure along the road samples were taken along different failed sections of the road following a geological mapping of the area.…”