Abstract
The study utilized two locally abundant materials; Cassava Peels Ash (CPA) and Laterite as
constituents for rural projects. The availability of these materials in West-Africa permitted the
study. Partly blending Ordinary Portland Cement (OPC) and Sand with an agricultural waste-CPA
and Laterite respectively against the effect of short term hydration on the products compressive
strength was investigated. 192 cubic specimens of 100 mm dimensions were cast and cured in
water for 7, 14, 21, and 28 days, adopting a control of 28 day-25 N/mm2 targeted strength. The
OPC/CPA and sand/laterite substitute ratios were 0-30% with views to determine the best
substitute matrix. Density and compressive strength decreased with increased CPA and laterite
content. However, strength development increased over hydration ages. 28 days density and
compressive strength of the normal concrete was 2385 kg/m3 and 27.05 N/mm2 while the best
matrix (10% CPA+10% laterite) had 2322 kg/m3 and 25.57 N/mm2 respectively. The strength of
the green concrete was higher than the adopted strength at 28 days, which makes it suitable for
use. It can be used without compromising standards in simple foundations and masonry units as a
prime cost reduction in rural housing and development.