摘要
将聚乙烯醇PVA以不同聚胶比（P/B）掺入水泥基灌浆材料中,研究PVA掺量对水泥基灌浆材料抗折强度、抗压强度以及弯曲应变的影响,并进一步确定最佳的PVA掺量;其次对比分析最佳掺量、未掺PVA两种灌浆材料对半柔性路面材料低温性能的影响;最后通过红外光谱试验分析PVA对水泥基灌浆材料的改性机理。结果表明：与PVA-1988相比,PVA-2099可显著提高水泥基灌浆材料抗折、抗压强度,但两种PVA均可改善水泥基灌浆材料的弯曲变形能力,掺量宜为0.1%~0.5%;与未改性水泥基灌浆材料相比,0.1%掺量的PVA-2099可显著提高半柔性路面材料的低温弯拉应力、最大弯曲应变,增幅分别为46.33%、11.92%;PVA改性水泥基复合材料水化主要经历水化交联、填充密实、固结硬化3个阶段,且PVA在自身形成网状结构的同时,又与水泥水化产物发生化学键合形成醋酸钙,提高材料整体强度及变形能力。
In order to investigate the effect of PVA on the low temperature performance of semi flexible pavement material, cement grouting materials with different P/B were mixed. The effects of PVA content on flexural strength, compressive strength and bending strain of cement based grouting materials were studied to determine the optimum mix amount of PVA. The influences of low temperature performance of semi flexible pavement material with or without optimum mix amount of PVA were comparative analyzed. Finally, modification mechanisms of PVA cement grouting material were studied through infrared spectrum experiment. The experimental results show that： PVA-2099 can significantly improve the flexural and compressive strength of cement grouting material, but two kinds of cement grouting materials with the amount of PVA 0. 1 %-0. 5 % can improve the bending deformation capacity. Compared without PAV-2099, 0. 1% PVA-2099 can significantly improve the low temperature bending stress and maximum bending strain of semi flexible pavement materials, increasing of 46.33% and 11.92% respectively. Cement based composite materials with PVA were mainly experienced in 3 stages of hydration crosslinking, filling role and consolidation hardening. PVA formed a mesh structure itself, reacting calcium acetate with the cement hydration products chemically, and enhanced the overall strength and deformation ability.
出处
《武汉理工大学学报》
CAS
北大核心
2016年第2期44-49,共6页
Journal of Wuhan University of Technology
基金
山西省交通厅科技项目(2013-1-1)
关键词
道路工程
半柔性路面
低温开裂
聚乙烯醇
红外光谱
改性机理
road engineering
semi flexible pavement
low temperature cracking
polyvinyl alcohol
infrared spectrum
modification mechanism
