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Structural Design Specifications for Concrete Made with Laterite Rock as Coarse Aggregates

Abstract


The suitability of Laterite rock aggregate from various geological locations has been investigated in several works as possible alternative to crushed rock granite and gravels. However, there are no unified specifications of laterite rock aggregate for application in design and constructions. This work is therefore intended to provide basic parameters used in the design of laterite rock concrete for beams and other structural works. The experimental procedure conforms with the BS and ASTM standards for testing of materials. Parameters investigated on in this work includes but not limited to physical properties such as PSD, specific gravity, density etc. chemical properties; the flow-ability of laterite rock concrete in its wet state, the compressive, splitting tensile strengths and rate of absorption of water and the stress/ strain relationship were determined in its hardened state. Results showed that an average compressive strength of 15 N/mm2is adequate for use in minor structural works. It was also computed that the splitting tensile strength approximate to about 10% of the compressive strength. However, the water absorption rate is least in the highest grade of LRC of 1:1:2 and the designed mix of 1:1.35:3.15 possesses high propensity of water absorption. A maximum of 10.92%, 12.02%, 11.12% and 10.24% for the four mixes were computed respectively for the four mixes investigated on. And the splitting tensile relationship with compressive strength of LRC for the mixes at 28 days of curing showed progressive increase with respect to the strength of the LRC. Hence concrete made with 1:1:2 has higher resilience to abrasive forces/ action.


Keywords

Laterite rock aggregate (LRA), Laterite rock concrete (LRC),compressive strength, age, water/cement ratio (w/c), slump, specific gravity, density, workability, splitting tensile strength, durability, water absorption rate, and stress-strain of LRC.

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