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This study applies recycled concrete as a replacement of coarse aggregate to produce concrete paving blocks. The experiment is conducted to observe concrete strength of the specimen samples. The Thai Industrial Standard for concrete paving blocks (TIS 8272531) has specified concrete samples at 28 days to have compressive strength surplus 350ksc. This study, recycled concrete has been used at various proportions, 50%, 70%, and 100% replacement of coarse aggregate. The mix concrete uses watercement ratio 0.47 with design slump 10±2.5cm. Average concrete strengths at 28days are 665 ksc, 456 ksc and 350 ksc. Thus, this work shows possibility that dumped concrete can be recycled with full 100% replacement of coarse aggregate in making concrete paving blocks.
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