Abstract
Present study deals with the laboratory investigations for fabrication of M-35 grade concrete paving blocks using recycled coarse and fine aggregates as a replacement of natural aggregates from 25 to 100 % level by weight and results were compared with control. It was observed that properties of recycled aggregates were inferior to natural aggregates. However, the properties of recycled aggregates enhanced after washing. The test results of blocks showed that the replacement of natural aggregates by recycled aggregates at the level of 25 % had little effect on the compressive strength and it decreased beyond these levels. As compare to natural aggregates, the flexural strength of paving blocks was higher using recycled aggregates. Durability performance of blocks like water absorption, density and abrasion resistance was also improved using washed recycled coarse aggregates. Petrographic image analysis showed improvement in the interface of washed recycled coarse aggregates and surrounding matrix.
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