THE EVALUATION OF CERAMIC WASTE AS PARTIAL REPLACEMENT OF COARSE AGGREGATE IN HOT MIX ASPHALT
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ABSTRACT The study investigates the suitability of ceramic waste aggregate (CWA) as partial replacement for coarse aggregate in asphalt concrete. In order to achieve the aim of the study, consistency tests such as sieve analysis, aggregate crushing and impact value, water absorption, particle shape (flakiness and elongation) and specific gravity were conducted for coarse aggregate and ceramic waste aggregate. Asphalt briquettes, using 100% conventional coarse aggregate (control) and variations of ceramic waste aggregate from 10%, 20%, 30% 40% and 50% were prepared. The mechanical property (Marshall Tests) was conducted for all prepared briquettes. From the test results, it was observed that the stability value of conventional coarse aggregate (control) gave 4kN and that of CWA 20% and 50% gave 4.0kN and 3.59kN respectively as against 3.5kN as minimum value specified in Nigerian General Specification for Roads and Bridges (1990). The corresponding results for flow, voids in total mix and voids filled with bitumen for sample containing 0% CWA are: 2.88mm, 4.20% and 71.93% respectively. Samples containing 20% CWA had flow, voids in total mix and voids filled with bitumen values as 2.77mm, 4.8%, and 73.93% respectively and samples containing 50% CWA had flow, voids in total mix as 2.58mm and 10.80% respectively. This shows that the 0% to 20% falls under specification of VIM 3% - 5%. The optimum bitumen content of 6.0% and higher stability of 4kN was recorded at a variation of 20% CWA and 80% conventional coarse aggregate. From this study, it can be concluded that up to 20% ceramic waste aggregate can be utilized as coarse aggregate in asphalt concrete for lightly trafficked roads.
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