为改善废旧聚乙烯(PE)改性沥青的储存稳定性和低温性能,采用双螺杆挤出机对废旧PE进行预处理,将其与生物油复合制备了生物油/预处理废旧PE复合改性沥青。通过正交试验优选出生物油/预处理废旧PE复合改性沥青的最佳制备工艺;通过离析试验和流变性能试验研究复合改性沥青的路用性能;通过车辙试验、低温弯曲梁试验、浸水马歇尔试验和冻融劈裂试验研究了复合改性沥青混合料的路用性能。结果表明:与未处理废旧PE改性沥青相比,预处理废旧PE改性沥青具有更好的储存稳定性且加入生物油后,复合改性沥青的储存稳定性得到进一步改善;添加预处理废旧PE和生物油会降低复合改性沥青的高温性能,但能显著提高其低温性能;预处理废旧PE能够提高沥青混合料的高温稳定性和水稳定性,但会降低其低温抗裂性能,与生物油复合后沥青混合料的高温性能与水稳定性均会出现不同程度的降低,而低温抗裂性能提升明显且均优于基质沥青混合料。
In order to improve the storage stability and low temperature performance of waste PE modified asphalt,this study used a twin-screw extruder to pretreat waste PE to prepare bio-oil/pretreated waste PE composite modified asphalt by combing it with bio-oil.The optimum preparation process of bio-oil/pretreated waste PE composite modified asphalt was determined through orthogonal test.Then,the road performance of the bio-oil/pretreated waste PE composite modified asphalt was studied by segregation test and rheological performance test.Additionally,the road performance of the composite modified asphalt mixture was studied through rutting test,low-temperature bending beam test,immersion Marshall test and freeze-thaw splitting test.The results showed that the storage stability of the pretreated waste PE modified asphalt was better than that of untreated waste PE modified asphalt,and the storage stability of the composite modified asphalt was further improved after adding bio-oil.The addition of pretreatment PE and bio-oil could reduce the high-temperature performance of the composite modified asphalt,but could significantly improve the low-temperature performance.Pretreatment of waste PE could improve the high-temperature stability and water stability of asphalt mixture,but reduced its low-temperature cracking resistance.After combining with bio-oil,the high-temperature performance and water stability were reduced to varying degrees,while the low-temperature cracking resistance was significantly improved,and both were better than that of matrix asphalt mixtures.
[1] Chen Y D,Cui Z J,Cui X W,et al.Life cycle assessment of end-of-life treatments of waste plastics in China[J].Resources,Conservation & Recycling,2019,146:348-357.
[2] Ingrassia L P,Lu X H,Ferrotti G,et al.Renewable materials in bituminous binders and mixtures:speculative pretext or reliable opportunity[J].Resources,Conservation & Recycling,2019,144:209-222.
[3] Punith V S,Veeraragavan A.Behavior of asphalt concrete mixtures with reclaimed polyethylene as additive[J].Journal of Materials in Civil Engineering,2007,19(6):500-507.
[4] Attaelmanan M,Feng C P,Ai A H.Laboratory evaluation of HMA with high density polyethylene as a modifier[J].Construction and Building Materials,2010,25(5):2764-2770.
[5] Cuadri A A,Roman C,García-Morales M,et al.Formulation and processing of recycled-low-density-polyethylene-modified bitumen emulsions for reduced-temperature asphalt technologies[J].Chemical Engineering Science,2016,156:197-205.
[6] Zhang F,Hu C B.The research for crumb rubber/waste plastic compound modified asphalt[J].Journal of Thermal Analysis and Calorimetry,2016,124(2):729-741.
[7] 杜镇宇,袁捷,肖飞鹏.低密度聚乙烯改性沥青低温性能评价方法改进[J].建筑材料学报,2021,24(5):1032-1038.
[8] 马嘉森,薛永兵,郭旗,等.废旧塑料改性剂改性沥青的研究进展[J].中国塑料,2022,36(2):131-138.
[9] Abo Shanab Z L,Ragab A A,Naguib Hamdy M.Improved dynamic mechanical properties of sustainable bio-modified asphalt using agriculture waste[J].International Journal of Pavement Engineering,2019,22(7):1-7.
[10] Dimter S,Šimun M,Zagvozda M,et al.Laboratory evaluation of the properties of asphalt mixture with wood ash filler[J].Materials,2021,14(3):575.
[11] 廖晓锋,雷茂锦,陈忠达,等.生物结合料共混沥青的路用性能试验研究[J].材料导报,2014,28(2):144-149.
[12] Yang X,You Z P.High temperature performance evaluation of bio-oil modified asphalt binders using the DSR and MSCR tests[J].Construction and Building Materials,2015,76:380-387.
[13] 严超,魏显权,方杨.沥青混合料水稳定性能评价方法研究[J].公路,2019,64(10):29-33.
基金资助
湖南省自然科学基金(2021JJ30709);长沙市自然科学基金(kq2007029);长沙理工大学研究生科研创新资助项目(CX2021SS05)
PDF
