2017•International Journal of Engineering and TechnologyOpen access
Suitability of Medium-K Basaltic Andesite Pumice and Scoria as Coarse Aggregates on Structural Lightweight Concrete
Hendro Suseno, Agoes Soehardjono M D, I.N.G. Wardana, Arief Rachmansyah
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Abstract
This study presented an optimization of the suitability of medium-K basaltic andesite pumice and scoria as coarse aggregates on structural lightweight concrete.The testing results indicated that these pumice and scoria had a typical characteristic so that they were completely different from those existed previously.Both typical vesicular rocks also fulfilled the requirements of coarse lightweight aggregate.The mix designs of structural lightweight concrete for the specified compressive strengths yielded Portland-Pozzolan Cement (PPC) contents were relatively lower than the previous studies conducted.The property of fresh concrete tests showed that for the specified slump values, the lightweight concrete mixtures can achieved satisfactory workabilities.While the properties of hardened concrete tests showed that almost all equilbrium densities fulfilled the requirements, but three equilibrium densities of scoria lightweight concrete were slightly greater than the requirements so that they were classified as structural semi-lightweight concretes.In addition, the use of typical pumice and scoria as coarse aggregates on that concrete yielded a significant density reduction, ie.approximately 20 %.The compressive strength obtained in the tests conducted can achieved those specified in the mix designs however two pumice structural lightweight concretes did not achieve them.The ultimate strains and modulus of elasticities also remained in proportional values, while the splitting tensile strengths and modulus of ruptures were relatively low when compared with previous studies. Keywords-pumice,
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