Abstract
The spent fluid catalytic cracking (SFCC), waste from the petroleum industry, is nonstop increasing and causing environmental pollution in Vietnam. This study is an attempt to recycle SFCC in pavement construction. The study investigated the effect of SFCC, as a filler material in the hot-mix asphalt (HMA), on the essential characteristics of the asphalt concrete mix. First, the optimum percentages of bitumen and SFCC rate were investigated based on the Marshall design method. The HMA with SFCC showed more enhanced stability, flow, and other Marshall properties than the asphalt concrete mixture with the optimum limestone filler of 5%. Besides, the effects of SFCC rates on Marshall characteristics were explored. Second, performance tests were conducted to compare the mix with the different optimum content fillers of SFCC, limestone, and Portland cement. The tests include wheel tracking, indirect tensile, fatigue, and dynamic modulus tests to evaluate the performance of HMA with SFCC. It was found that the asphalt mixture with the optimum SFCC filler content can enhance pavement performance and improve the rutting and cracking resistance of the asphalt pavement.
Highlights
Materials exploited from natural sources used in construction are increasing dramatically
Vietnam has two working oil refineries. e Dung-Quoc oil refinery is located in the Quang-Ngai province, and the Nghi-Son oil refinery is located in the anh-Hoa province
Besides the asphalt concrete mixture with limestone (LS), the asphalt concrete mix with Portland cement (PC) was compared to the asphalt concrete mix with the spent fluid catalytic cracking (SFCC) filler in performance testing. e asphalt concrete mix with Portland cement replaced with the LS powder was the compared mixture because Portland cement was reported to improve hot-mix asphalt (HMA) performance
Summary
Materials exploited from natural sources used in construction are increasing dramatically. Too much mineral powder causing a more hardened binder leads to asphalt concrete cracking under the high-pressure value of axle loading. It reduces the film thickness of the asphalt binder surrounding large aggregates, reducing the mixture stability and making the aggregates quickly dislodge from the pavement surface. E demand for mineral powder is very high because of the enormous asphalt concrete required in Vietnam construction. Is study is an effort to use SFCC as filler replacing completely mineral powder in asphalt concrete in Vietnam. E main objective of this paper is to study the use of spent catalysts collected from refineries in Vietnam as a filler of asphalt concretes. Besides the asphalt concrete mixture with limestone (LS), the asphalt concrete mix with Portland cement (PC) was compared to the asphalt concrete mix with the SFCC filler in performance testing. e asphalt concrete mix with Portland cement replaced with the LS powder was the compared mixture because Portland cement was reported to improve HMA performance
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