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An investigation conducted to find long term concrete strength and durability properties of concrete blends incorporating three different agro wastes in cement, namely rice husk ash (RHA); de-oiled earth (DOE); and spent bleach earth (SBE) as a cement substitute. These materials blended as binary ternary and quaternary concrete by replacing agro waste. Ten different mixes were prepared, including controlled concrete and assessed for compressive strength, nondestructive test, chloride penetration test, and accelerated corrosion test. Results demonstrates that 7.5% RHA and DOE as cement substitute improves compressive strength compared with control at early and later ages. From the nondestructive test, the agro-waste mixtures proved as good quality. The utilization of agro-waste as a cement substitute in all replacement levels presented an excellent performance on reducing chloride ions. In corrosion test, crack initiation duration retards with the incorporation of SBE and DOE with high replacement in binary blend and combination of SBE-RHA at 2.5% at ternary and at quaternary combinations of SBE-DOE-RHA at 2.5%. Accordingly good correlation was established between actual and faradays mass loss. |
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