自愈合路面基层材料使用性能研究

发布时间：2019-03-31 12:42

【摘要】：为了提高沥青路面半刚性基层的抗裂能力，同时使基层具备自愈合性能，将制备PVA纤维增强水泥基复合材料(PVA-ECC)的主要原材料(包括水泥、粉煤灰、石英砂及聚乙烯醇纤维)，按一定比例掺入普通路面基层材料中，寻求一种新型的具有自愈合能力的路面基层材料—PVA-ECC稳定碎石基层材料。本文对PVA-ECC稳定碎石基层材料和普通水泥稳定碎石基层材料的使用性能进行了对比试验研究；研究了级配对PVA-ECC稳定碎石基层材料使用性能的影响；研究了级配、不同环境条件、巴氏芽孢杆菌和水泥基渗透结晶型防水材料对PVA-ECC稳定碎石基层材料自愈合性能的影响。结果表明：PVA-ECC稳定碎石基层材料的强度性能、刚度性能、抗冻性能均优于水泥稳定碎石基层材料，但收缩性能和抗冲刷性能比水泥稳定碎石基层材料差；普通路面基层材料没有明显的自愈合性能，而PVA-ECC稳定碎石基层材料有良好的自愈合性能，自愈合后抗压强度提高57.3%，用其铺筑的路面基层可称为自愈合路面基层。骨架密实级配下限PVA-ECC稳定碎石基层材料抗压强度、劈裂强度、刚度性能、收缩性能、抗冻性能最好，在标养室养护、干湿循环环境条件下自愈合效果最好，，菌液浸泡后自愈合强度最高，自愈合后抗压强度提高85%，且可以实现裂缝全部愈合；骨架密实级配上限PVA-ECC稳定碎石基层材料弯拉强度最高，在置于户外环境条件下自愈合效果最好；骨架密实级配中值PVA-ECC稳定碎石基层材料的抗冲刷性能最佳。添加水泥基渗透结晶型防水材料后，PVA-ECC稳定碎石基层材料的自愈合强度提高3%左右，骨架密实级配下限PVA-ECC稳定碎石基层材料自愈合强度提高幅度最大。
[Abstract]:In order to improve the crack resistance of semi-rigid base of asphalt pavement and self-healing property of base, the main raw materials (including cement, fly ash) of PVA fiber reinforced cement-based composite (PVA-ECC) were prepared. Quartz sand and polyvinyl alcohol fiber (PVA) are mixed into common pavement base materials in a certain proportion to seek a new kind of self-healing base material-PVA-ECC stabilized macadam base material. In this paper, the performance of PVA-ECC stabilized macadam base material and ordinary cement stabilized macadam base material were studied, and the influence of gradation on the service performance of PVA-ECC stabilized macadam base material was studied. The effects of grading, different environmental conditions, Bacillus pasteurium and cement-based permeable crystalline waterproof materials on the self-healing properties of PVA-ECC stabilized macadam base materials were studied. The results show that the strength, stiffness and frost resistance of PVA-ECC stabilized macadam base material are better than that of cement stabilized macadam base material, but its shrinkage and scour resistance are worse than that of cement stabilized macadam base material. The common pavement base material has no obvious self-healing performance, but the PVA-ECC stabilized crushed stone base material has good self-healing performance, and the compressive strength after self-healing increases by 57.3%. The pavement base with it can be called self-healing pavement base. PVA-ECC stabilized macadam base material has the best compressive strength, splitting strength, stiffness, shrinkage and freezing resistance, and the self-healing effect is the best under the condition of standard curing room and dry and wet circulation environment, and the base material has the best compressive strength, splitting strength, stiffness, shrinkage and freezing resistance. The self-healing strength was the highest after soaking in bacterial solution, and the compressive strength was increased by 85% after self-healing, and all the cracks could be healed. The bending and tensile strength of the PVA-ECC stabilized macadam base material with the upper limit of skeleton dense gradation is the highest and the self-healing effect is the best in outdoor environment, and the erosion resistance of the skeleton dense gradation median PVA-ECC stabilized macadam base material is the best. With the addition of cement-based permeable crystalline waterproof material, the self-healing strength of PVA-ECC stabilized macadam base material is increased by about 3%, and the self-healing strength of PVA-ECC stabilized macadam base material with the lower gradation limit of skeleton density is the largest.
【学位授予单位】：湖南大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U414

【参考文献】