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Properties of laterite aggregate concrete

Abstract

The paper presents the results of tests conducted on fresh and hardened concrete using laterite as aggregate. Several mixes of laterite aggregate concrete were made with varying watercement and aggregate-cement ratios to study the properties like workability, compressive, flexural, tensile strength and Modulus of elasticity. The tests indicate that the workability decreases with increasing aggregate-water ratio. The compressive strength of laterite aggregate concrete is considerably lower than that of gravel or crushed granite aggregate concrete, while the average ratio of cylinder to cube strength compared favourably with that for normal aggregate concrete, for the range of aggregate and water-cement ratios covered in this investigation.

Résumé

On rend compte des études expérimentales sur le béton frais et le béton durci confectionnés avec des granulats de latérite qui sont abondants sur la côte sud-ouest de l'Inde. On a constaté que la proportion de 5/1 de latérite par rapport au sable de rivière donnait un béton d'ouvrabilité et de compactibilité satisfaisantes. On a confectionné plusieurs mélanges dont les rapports eau/ciment allaient de0,40 à0,60 et les rapports granulat/ciment de4 à6. On a étudié diverses propriétés, telles que l'ouvrabilité du béton jeune, les résistances en compression, flexion et traction, ainsi que le module d'élasticité du béton durci, sur cubes, cylindres et prismes.

Les essais ont montré que l'ouvrabilité du béton à granulat de latérite, exprimée en résultats d'essais d'affaissement ou d'essais “vébé”, diminue avec l'augmentation du rapport granulat/eau. La résistance à la compression, qui va de 5 à 10 N/mm2 s'est révélée beaucoup plus faible que celle du béton à granulat de gravier ou de granit concassé, pour les proportions de granulat et les rapports eau/ciment considérés dans cette étude. La résistance en flexion du béton à granulat de latérite était de 20% de la résistance en compression, tandis que le rapport moyen de résistance en traction par fendage aux résistances en flexion et en compression était respectivement de 0,10 et de 0,47.

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Raju, N.K., Ramakrishnan, R. Properties of laterite aggregate concrete. Mat. Constr. 5, 307–314 (1972). https://doi.org/10.1007/BF02474873

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