摘要
对5个不同水胶比的ECC圆柱体试件进行了常规三轴受压试验,测得了不同水胶比与不同围压下ECC试件的轴向应力-应变全曲线,主要分析了围压和水胶比对ECC受压性能的影响,研究结果表明:侧向围压约束了ECC的横向变形,在提高其极限抗压强度的同时,纵向变形能力有很大提高;水胶比较大的试件其横向变形较大,当处于高围压约束作用下,试件的应力-应变曲线未出现下降段。水胶比相同时,随着围压的增加,ECC的极限抗压强度与峰值应变均明显提高;围压相同时,水胶比增大,ECC极限抗压强度降低,但水胶比对峰值应变的影响则不太明显。根据试验结果得出了ECC的极限抗压强度、轴向峰值应变与侧向围压之间的关系,研究结果可为今后建立适合ECC的多轴本构模型提供基础依据。
The conventional triaxial compression behaviors of ECC were tested through cylindrical specimens with 5 different water - binder ratio and the axial stress - strain curves with different water - binder ratio and different confining pressure were obtained. It mainly analysed the influences of confining pressure and water - binder ratio on compression performance of ECC. Study results indicate that lateral confining pressure constraints the lateral deformation of ECC, so deformation ability is greatly improved with its ultimate compressive strength improved. The specimens with bigger water - binder ratio have bigger lateral deformation, so the stress - strain curves don＇t decline under high confining pressure. With the same water - binder ratio, ultimate strength and peak strain of ECC are significantly improved as the confining pressure increases.With the same confining pressure ,ultimate strength is reduced as the water -binder ratiQ increases, but the water - binder ratio has no obvious effect on peak strain. According to test results, the paper establishes formula of confining pressure with ultimate strength and peak strain, which can provides the basis for the development of multiaxial constitutive models for ECC.
出处
《混凝土》
CAS
北大核心
2016年第1期59-63,共5页
Concrete
基金
国家自然科学基金资助项目(51208183)
河南省科技攻关项目(132102310312)
河南省自然科学研究计划项目(12B560006)
河南理工大学博士基金资助项目(B2012-032)
关键词
聚乙烯醇纤维
工程纤维增强水泥基复合材料
侧向围压
极限抗压强度
峰值应变
PVA fiber
engineered fiber reinforced cementitious composite
lateral confining pressure
ultimate compressive strength
peak strain
