水胶比及骨料粒径对大坝混凝土断裂性能影响的研究
Study on Effect of Water-binder Ratio and Aggregate Size on Fracture Performance of Dam Concrete
王华丽1
作者信息
- 1. 河南信禹监理有限公司,河南 南阳 473000
- 折叠
摘要
文中结合某大坝工程所用混凝土配合比,分别制作5 组共20 个混凝土试件进行三点弯曲梁断裂试验,分析了混凝土断裂参数在不同水胶比、不同骨料粒径条件下的差异.结果表明,大坝混凝土失稳韧度随所掺加粗骨料粒径的提升而增加,同时其特征长度、断裂能、起裂韧度等性能均表现出前期增长、后期降低的发展趋势;断裂能、失稳韧度和起裂韧度等参数随水胶比增加而降低,混凝土抵抗失稳破坏、开裂、裂缝生成及发展的能力随水胶比增加而降低.
Abstract
In this paper,based on the concrete mix ratio used in a dam engineering practice,5 groups of 20 concrete specimens were made re-spectively for three-point bending beam fracture experiment,and the differences of concrete fracture parameters under different water-binder ratio and different aggregate size were analyzed.The results show that the instability toughness of dam concrete increases with the increase of coarse aggregate particle size,and its characteristic length,fracture energy and crack initiation toughness all increase in the early stage and de-crease in the later stage.The parameters of fracture energy,instability toughness and crack initiation toughness decrease with the increase of water-binder ratio.The ability of concrete to resist instability failure,cracking,crack formation and development decreases with the increase of water-binder ratio.
关键词
三点弯曲梁实验/断裂参数/水胶比/粗骨料/骨料粒径Key words
Three-point bending beam experiment/Fracture parameters/Water-binder ratio/Coarse aggregate/Aggregate size引用本文复制引用
出版年
2024
国家科技期刊平台
NSTL
万方数据