工程科学学报2016，Vol.38Issue(11)：1603-1609,7.DOI:10.13374/j.issn2095-9389.2016.11.014
改性聚酯纤维在混凝土中的分散性及对耐久性的影响
Dispersivity of modified polyester fibers in concrete and its influence on the durability of concrete
陈建强 1纪洪广 2刘娟红 1杨芳1
作者信息
- 1. 北京科技大学土木与环境工程学院，北京100083
- 2. 青岛理工大学土木工程学院，青岛266033
- 折叠
摘要
Abstract
Modified polyester fiber reinforced concrete with different additions was prepared. The dispersivity of modified polyes-ter fibers in concrete by five different mixing methods was studied by an image processing method. With a series of durability tests, the carbonation resistance, chloride penetration resistance and frost resistance of the fiber reinforced concrete were also investigated. The results indicate that the image processing method can evaluate the dispersivity of the fiber reinforced concrete well. The mixing method of “aggregate and binding materials for 60 s+water for 60 s+fiber for 60 s” makes the best dispersivity of modified polyester fibers. It is in accord with direct observations by naked eyes. The compressive strength is increased by the addition of modified polyester fibers. After adding 1. 1 kg·m-3 modified polyester fibers, the compressive strength of concrete increases by 14%; but with more modified polyester fibers, the compressive strength no longer increases. The existence of modified polyester fibers in concrete can slow down the diffusion of CO2 , the carbonation rate of concrete decreases by 12. 6% to 18. 9%, and with more modified polyester fibers, the carbonation resistance became better. After the addition of modified polyester fibers, the chloride diffusion coefficient of concrete also decreases. The modified polyester fibers can reduce the surface spalling of concrete during freeze-thaw cycles, which improves the frost resistance of concrete significantly.关键词
纤维性混凝土/聚酯纤维/分散性/耐久性Key words
fiber reinforced concrete/polyester fibers/dispersivity/durability分类
建筑与水利引用本文复制引用
陈建强,纪洪广,刘娟红,杨芳..改性聚酯纤维在混凝土中的分散性及对耐久性的影响[J].工程科学学报,2016,38(11):1603-1609,7.
