东南大学学报（英文版）2018，Vol.34Issue(2)：229-236,8.DOI:10.3969/j.issn.1003-7985.2018.02.013
PVA纤维增强碱激发矿渣砂浆板弯曲性能和破坏过程
Damage process and performance of PVA fiber-reinforced alkali-activated slag mortar plate under bending
摘要
Abstract
The effects of unoiled polyvinyl alcohol ( PVA ) fiber with four different volume fractions of 0%, 1. 0%, 1. 5% and 2. 0% on the bending properties of alkali-activated slag ( AAS ) mortar plates were studied. Meanwhile, the acoustic emission ( AE) technique and a high-speed camera were utilized to detect the crack development over the complete damage process, and the scanning electronic microscopy ( SEM ) was used to observe the fiber-matrix interface. Test results show that PVA fibers play a significant role in the toughness improvement of AAS plates. However, the enhancing effect of PVA fibers on the bending behaviour of AAS plates at 120 d is not as remarkable as at early ages. It is observed that the failure process of the PVA fiber-reinforced alkali-activated slag plate can be divided into three stages:elastic stage, main crack formation stage and post-peak load stage. Observations on the fracture surface of specimens indicate that the deterioration process of specimens under bending changed from fiber pull-out at 3 and 28 d to fiber fracture at 120 d.关键词
碱激发矿渣/PVA纤维/弯曲/声发射/破坏过程Key words
alkali-activated slag/polyvinyl alcohol fiber/bend/acoustic emission/damage process分类
建筑与水利引用本文复制引用
董承浩,李涛,张亚梅,刘加平..PVA纤维增强碱激发矿渣砂浆板弯曲性能和破坏过程[J].东南大学学报（英文版）,2018,34(2):229-236,8.基金项目
The National Basic Research Program of China (973 Program) ( No. 2015CB655100) , the National Natural Science Founda-tion of China ( No. 51378115) . （973 Program）
