聚酰胺基树脂型沥青路面浅槽快速修补材料的制备与性能研究

Preparation and Properties of Polyamide-based Resin Type Rapid Repair Material for Asphalt Pavement Shallow Groove

坑槽是沥青路面常见的早期病害,该病害若得不到及时维修和处置,将影响交通安全和道路服役寿命。为了解决传统冷补料在初期强度低、界面黏结力弱、耐久性差等问题,本研究研发了一种以聚酰胺6(PA6)为基体树脂,将其与聚丙烯(PP)、乙烯-乙酸乙烯酯共聚物(EVA)和马来酸酐接枝乙烯-辛烯共聚物(POE-g-MAH)等按比例复配,并通过挤出造粒制备的新型聚酰胺基树脂型沥青路面浅槽快速修补材料。采用抗弯强度试验研究了修补材料的弹性模量、屈服强度与抗弯强度;利用低温抗冲击试验与低温拉伸试验研究了修补材料的低温韧性;通过熔融指数试验分析了修补材料在使用状态下修补效果的优劣;应用浸水试验分析了修补材料的吸水能力;借助扫描电镜(SEM)观测了修补材料低温断裂面的微观结构,以及利用红外光谱(FTIR)试验推断了修补材料中发生的主要化学反应。研究结果表明,随着PP掺量的增加,其对修补材料的弹性模量、屈服强度、抗弯强度与低温韧性产生的负面影响逐渐显著;随着PP掺量从0%增至30%,修补材料熔融指数从15.6 g/10min降至3 g/10min,严重影响施工质量;PP对修补材料吸水性有良好的改善作用,当PP掺量从10%增加到20%时,修补材料的饱和含水率从5.6%降低到3.9%;PA6内部存在的氨基和POE-g-MAH中的马来酸酐发生增容反应,改善了PA6与PP之间的界面张力,从而提高了它们的相容性。基于以上试验得到了PP最佳含量为10%~20%。

Potholes are common early asphalt pavement disease,if not timely repair and disposal,which will result in traffic safety and road service life.In order to solve the problems of low initial strength,weak interfacial adhesion and poor durability of traditional Cold Mix Patching Materials(CMPMs),this study has developed a new polyamide-based resin type rapid repair material for asphalt pavement shallow groove.Polyamide 6(PA6)used as the base resin was compounded with polypropylene(PP),ethylene-vinyl acetate copolymer(EVA)and maleic anhydride grafted ethylene-octene copolymer(POE-g-MAH)in proportion to the repair material,and the shallow groove fast repair material is made by extrusion granulation.The elastic modulus,yield strength and bending strength of the repair material were investigated using flexural strength tests.The low-temperature impact resistance and low-temperature tensile tests were used to explore the low-temperature toughness of the repair material.The melt index test was conducted to expose the advantages and disadvantages in practice use of repairing materials.The water immersion test was employed to analyze the water absorption capacity of the repair material,and the scanning electron microscope was used to observe the microstructure of low temperature fracture surface of the repair material.Then the key chemical reaction of repair material was explored by an infrared spectroscopy test.The results showed that the negative effects on the elastic modulus,yield strength,bending strength and low-temperature toughness of the repair material gradually strengthened as the increasing content.The PP content increased from 0%to 30%,the melt index of repair material decreased from 15.6 g/10 min to 3 g/10 min,which seriously affected the construction quality at this time.The PP exhibited a good improvement on the water absorption of the repair material,when the PP content increased from 10%to 20%,the saturated water content reduced from 5.6%to 3.9%;the presence of amino groups inside PA6 and the compatibilization reaction of maleic anhydride in POE-g-MAH improved the PA6/PP interfacial tension,and thus improved compatibility between them.Based on the experimental study,the optimal PP content is considered to be 10%to 20%.