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This study used crushed pieces of hollow pavement masonry block as an alternative coarse aggregate for concrete mix by examining the related engineering and mechanical properties of the concrete to study the feasibility of future application not only to reduce the quantity but also to create additional value of the recycled material as beneficial rather than costly construction waste.
The results from this study indicate the 28-day strength of recycled concrete with water ratio of 0.5 1.0 and 1.5 were up to 309.18 kg/cm2, 104.17 kg/cm2, and 41.1 kg/cm2, respectively, which are about 70% ~ 75% of the standard concrete without using recycled aggregate. Overally speaking, the difference in compression strength between the recycled concrete and standard concrete were no more than 30%, however when recycled aggregate used less than 40%, the difference is less than 10%. In general, the experiment results show that the abrasion of the concrete specimens increases with increasing recycled aggregate percentage used, which is in the range of 130 ~ 260%. It should be noticed that the increase of abrasion can be up to more than 300% for recycled concrete with water cement ratio of 0.5.
The study conclude that the recycled concrete can be used for the construction of secondary structures such as minor river levee, pipeline excavation, CLSM (controlled low strength material), pedestrian walkway, bicycle lanes and paved farmland passage.
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