聚乙烯醇纤维对碱矿渣泡沫混凝土性能的影响

Effect of PVA Fiber on the Properties of Alkali Activated Slag Foam Concrete

以水玻璃为激发剂,制备干密度为350kg/m^3的碱矿渣泡沫混凝土,为提高碱矿渣泡沫混凝土的韧性,降低干燥收缩,本工作研究了聚乙烯醇(PVA)纤维对碱矿渣泡沫混凝土干密度、强度、折压比、吸水率和干燥收缩性能的影响。结果表明:PVA纤维对碱矿渣泡沫混凝土干密度无明显影响;PVA纤维掺量为0.6~1.2kg/m^3时,碱矿渣泡沫混凝土的抗折强度和折压比明显增加,韧性得到明显改善;碱矿渣泡沫混凝土吸水率也低于未掺纤维的泡沫混凝土;PVA纤维掺量大于0.6kg/m^3时,碱矿渣泡沫混凝土的干燥收缩显著降低;综合碱矿渣泡沫混凝土性能及经济性等因素,碱矿渣泡沫混凝土中PVA纤维最优掺量为0.6kg/m^3。

Alkali activated slag（AAS）foam concrete with dry density of 350 kg/m^3 was prepared with water glass activated slag cement.To increase the toughness and decrease the drying shrinkage of AAS foam concrete,the effect of polyvinyl alcohol（PVA）fiber content on the dry density,strength,water absorption and drying shrinkage of AAS foam concrete were tested in this paper.The results indicated that PVA fiber had little influence on the dry density of AAS foam concrete.When the PVA fiber content ranged between 0.6—1.2 kg/m^3,it increased the flexural strength and flexural-compressive ratio of AAS foam concrete,which mean the toughness of AAS foam concrete increased.Adding PVA fiber decreased the water absorption rate of AAS foam concrete.When the PVA fiber content was higher than 0.6 kg/m^3,the drying shrinkage of AAS foam concrete decreased with the increase of fiber content.Considering the properties of AAS foam concrete and economic efficiency in this research condition,the optimal content of PVA fiber in AAS foam concrete was 0.6 kg/m^3.