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(10×10×10 cm) which curing in water for 7 and 28 days included bulk density, water absorption, rebound
hardness, and compressive strength. Furthermore, mineralogical crystallization and microstructure of RSSA
concrete was analysed by mean of X-ray Diffraction and observed by Scanning Electron Microscope, respectively.
The test results indicated that all RSSA concrete specimens cured at 28-day displayed physical and mechanical
properties can be met level of structural lightweight concrete specification. It is take advantage of low cost and
friendly environmental of Thailand
Keywords: Lightweight concrete, Para rubber seed shell, Metakaolin, Coarse aggregate, Compressive strength
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