Abstract
Concrete aggregate have become scarce and costly, due to sudden increase in the need for new infrastructures. The use of waste materials in construction appears to be an alternative due to their low cost, environmental considerations and depleting source of quality aggregate. One of such attempts is made in this study. This research work presents the results of an experimental investigation carried out to evaluate the properties of new concrete pavement incorporating recycled concrete aggregate (RCA). Natural coarse aggregate (crushed granites) was replaced with six percentages (0, 20, 40, 60, 80 and 100%) of RCA. The slump, compressive strength, splitting tensile strength of the concrete containing different percentage of recycle concrete aggregate were determined. Test results showed that up to 100% replacement of coarse natural aggregate with RCA had no significant effect on any of the hardened concrete properties tested. These indicate that the use of quality RCAs in new concrete pavement production helps in solving a vital environmental issue apart from being a solution to the problem of inadequate concrete aggregates. The compressive strength results of concrete incorporating RCA at 0 to 100% replacement met the minimum 28 days strength specifications of relevant standards and manuals.
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