Sustainable materials in the field of road pavement have become a research direction in recent years. In this study, the rice husk ash with small dosage of styrene-butadiene-styrene (SBS) was added as a bioadditive into the base asphalt to modify its properties. Different contents (0, 2, 5, 10, and 15%) of rice husk ash (RHA) and 1% of SBS were selected to prepare the modified asphalt. Penetration, softening point, ductility, rotational viscosity test, and temperature sweep test were conducted to investigate the properties of SBS/RHA-modified asphalt binder. Rutting test, moisture susceptibility, and low-temperature cracking were utilized to evaluate the performances of SBS/RHA-modified asphalt mixture. The results showed that the penetration decreased and the softening point and rotational viscosity enhanced while the ductility slightly decreased with the incorporation of rice husk ash. The SBS/RHA-modified asphalt mixture had better high-temperature performance than that of the virgin asphalt mixture but slightly lower moisture stability and low temperature performance. The tensile strength ratio of the virgin and modified asphalt mixture met the requirement of specification. The tensile strain of mixture SR15 was lower than the requirement for the asphalt mixtures on the basis of the specification. For the SBS/RHA-modified asphalt binder based on the comprehensive properties, the content of rice husk ash should not be higher than 15%.

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SBS /稻壳灰改性沥青结合料和混合料的性能研究

近年来，道路路面中的可持续材料已成为研究方向。在这项研究中，将具有少量苯乙烯-丁二烯-苯乙烯（SBS）的稻壳灰作为生物添加剂添加到基础沥青中，以改变其性能。选择不同含量（0、2、5、10和15％）的稻壳灰（RHA）和1％的SBS，以制备改性沥青。进行了渗透，软化点，延展性，旋转粘度测试和温度扫描测试，以研究SBS / RHA改性沥青粘合剂的性能。通过车辙试验，湿气敏感性和低温开裂来评估SBS / RHA改性沥青混合料的性能。结果表明，随着稻壳灰的掺入，渗透率降低，软化点和旋转粘度提高，而延展性略有下降。SBS / RHA改性沥青混合料比原始沥青混合料具有更好的高温性能，但湿稳定性和低温性能略低。原始沥青和改性沥青混合料的抗拉强度比符合规范要求。SR15混合物的拉伸应变低于规范规定的沥青混合物要求。对于具有综合性能的SBS / RHA改性沥青粘结剂，稻壳灰分含量不应高于15％。SBS / RHA改性沥青混合料比原始沥青混合料具有更好的高温性能，但湿稳定性和低温性能略低。原始沥青和改性沥青混合料的抗拉强度比符合规范要求。SR15混合物的拉伸应变低于规范规定的沥青混合物要求。对于具有综合性能的SBS / RHA改性沥青粘结剂，稻壳灰分含量不应高于15％。SBS / RHA改性沥青混合料比原始沥青混合料具有更好的高温性能，但湿稳定性和低温性能略低。原始沥青和改性沥青混合料的抗拉强度比符合规范要求。SR15混合物的拉伸应变低于规范规定的沥青混合物要求。对于具有综合性能的SBS / RHA改性沥青粘结剂，稻壳灰分含量不应高于15％。SR15混合物的拉伸应变低于规范规定的沥青混合物要求。对于具有综合性能的SBS / RHA改性沥青粘结剂，稻壳灰分含量不应高于15％。SR15混合物的拉伸应变低于规范规定的沥青混合物要求。对于具有综合性能的SBS / RHA改性沥青粘结剂，稻壳灰分含量不应高于15％。