EFFECT OF PARTIAL REPLACEMENT OF SHARP SAND WITH LATERITE IN INTERLOCKING PAVEMENT
Abstract
 The need to reduce the high cost of concrete production resulting from increasingcost of fine aggregate formed the basis for the study. The study was undertaken toeffect of partial replacement of sand with laterite on strength properties ofconcrete. Laterite sample was added to sand in an increasing order of 5%, 10%,15%, 20% and 25% by weight of sand. Experimental testing was conducted so asto evaluate the effect of partial replacement of sand with laterite on strengthproperties of concrete. These tests are: sieve analysis test, specific gravity test, bulkdensity test, slump test and compressive strength test. Results obtained from sieveanalysis test revealed that granite, sand and laterite were classified as A-1-b, A-2-4and A-2-6 according to AASHTO Soil Classification System, GC, SM and SCaccording to Unified Soil Classification System, the specific gravity of granite,sand and laterite were 2.61, 2.55 and 2.66 respectively, the liquid limit, plasticlimit and plasticity index of the laterite sample was 42.4%, 25.9% and 16.5%. Theslump of the concrete increased from 0% addition of laterite to 15% addition oflaterite to sand, the hardened density and compressive strength of the concreteincreased from 0% addition of laterite to sand to 5% addition of laterite to sandbeyond 5% laterite content, the hardened density and compressive strength wasfound to decrease. This study therefore discourage the use of laterite as partialsubstitute for sand in concrete beyond 5% addition of laterite to sand as thecompressive strength of the concrete were found to decrease.6
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