摘要
采用平板状试件和快速氯离子迁移试验研究了聚丙烯纤维对粉煤灰混凝土早期抗裂性及抗渗性的影响.试验结果表明,随着粉煤灰的掺量增加,混凝土裂缝的最大宽度和裂缝的最大长度均降低,混凝土表面裂缝的面积变小;聚丙烯纤维掺入粉煤灰混凝土后,可以分担部分应力,细化裂缝,减少开裂总面积,有效的改善混凝土的抗裂性.同时聚丙烯纤维降低了氯离子渗透系数,提高粉煤灰混凝土的抗渗性能,混凝土的耐久性增加.
In this paper, the influences of fly ash and polypropylene fiber on crack-resistance of concrete were investigated using plate specimen and RCM. The results indicated that the maximum width and length of crack were decreased with the increase of content of fly ash. The total area of cracks on the surface of concrete was decreased at the same time. When polypropylenes fibers were added in concrete, it could sustain part of tensile stress, to make the cracks becoming thin. The total area of cracks was decreased too. The resistance to early shrinkage performance and the resistance of the chloride ion permeability were improved effectively for polypropylenes fibers, the durability of concrete was changed better at the same time. Polypropylenes fibers enhance the durability of contrete contaning fly ash.
出处
《湖南城市学院学报（自然科学版）》
CAS
2014年第1期6-9,共4页
Journal of Hunan City University:Natural Science
基金
江苏省建筑安全与减灾工程技术研究开发中心科研项目(SAQZX2011-8)
关键词
聚丙烯纤维
粉煤灰
抗裂性
抗渗性
fly ash
polypropylene fiber
crack-resistance
impermeability
