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大掺量橡胶粉对沥青玛蹄脂碎石混合料低温性能的影响

Effect of Large Amount of Rubber Powder on Low Temperature Performance of Stone Mastic Asphalt
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摘要 为提高废旧轮胎的回收利用率,将轮胎粉碎加工成橡胶粉,采用等体积法替换石灰石集料,优化橡胶粉级配设计,制备聚酯纤维掺量0.4%和不同橡胶粉替代率(0、1.5%、2.0%、2.5%、3.0%、3.5%、4.0%)的沥青玛蹄脂碎石混合料(stone mastic asphalt, SMA)。基于马歇尔稳定度试验和半圆弯曲(semi-circular bending, SCB)试验,采用SCB试件的极限拉应力、断裂能、断裂韧性和断裂劲度综合分析了不同低温环境下橡胶粉对SMA-13沥青混合料抗裂性能的影响。结果表明:SMA-13沥青混合料的最佳沥青用量与橡胶粉掺量成正比,橡胶粉掺量的增加会提高混合料的弹性性能。与石灰岩沥青混合料相比,橡胶粉沥青混合料抗裂能力更加稳定和优异。当橡胶粉替换率为3%时,SMA-13沥青混合料抵抗变形能力最强,可显著提升其低温性能,为沥青路面材料组成设计提供了理论依据。 In order to improve the recycling rate of waste tires,the tires were crushed and processed into rubber powder,limestone aggregates were replaced by the iso-volumetric method,and the grading design of the rubber powder was optimized,and the stone mastic asphalt(SMA)were prepared with a polyester fiber dosing of 0.4%and different replacement rates of the rubber powder(0,1.5%,2.0%,2.5%,3.0%,3.5%,and 4.0%).Based on the Marshall stability test and semi-circular bending test(SCB),the effects of rubber powder on the cracking resistance of SMA-13 asphalt mixtures at different low temperatures were comprehensively analyzed using the ultimate tensile stress,fracture energy,fracture toughness,and fracture stiffness of SCB specimens.The results show that the optimum asphalt dosage of SMA-13 asphalt mixture is directly proportional to the dosage of rubber powder,and the increase in the dosage of rubber powder improves the elastic properties of the mixture.Compared with limestone asphalt mixtures,rubber powder asphalt mixtures have more stable and excellent crack resistance.When the replacement rate of rubber powder is 3%,SMA-13 asphalt mixture has the strongest resistance to deformation,which can significantly improve its low-temperature performance,providing a theoretical basis for the design of asphalt pavement material composition.
作者 吴金荣 吕国强 牛兆旭 WU Jin-rong;LÜGuo-qiang;NIU Zhao-xu(School of Civil Engineering and Architecture,Anhui University of Science and Technology,Huainan 232001,China;Engineering Research Center of Underground Mine Construction,Ministry of Education,Anhui University of Science and Technology,Huainan 232001,China)
出处 《科学技术与工程》 北大核心 2024年第24期10484-10490,共7页 Science Technology and Engineering
基金 安徽理工大学研究生创新基金(2023cx2049)。
关键词 橡胶粉 半圆弯曲试验 最佳沥青用量 低温性能 rubber powder semi-circular bending test optimum amount of asphalt low temperature performance
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