摘要
设计了10组ECC试件,并进行了哑铃型单轴拉伸和薄板四点弯曲试验,研究了粉煤灰掺量、水胶比和PVA纤维体积率对ECC拉伸性能与弯曲性能的影响。结果表明,增加粉煤灰掺量,ECC试件抗拉强度和抗弯强度均先增大后减小,当粉煤灰掺量为1.2时,ECC的受拉应变-硬化特性最明显,极限拉应变可稳定达到4.7%以上;增大水胶比,ECC的抗拉强度和抗弯强度降低,但极限拉应变增大且受拉应变-硬化特性明显;增大PVA体积率可明显提高ECC的抗拉强度、极限拉应变和抗弯强度。
The uniaxial tension and four-point bending tests of 10 groups of ECC specimens were carried out to study the effects of fly ash content,water-binder ratio and PVA fiber volume ratio on tensile properties and bending properties of ECC.The results show that the tensile strength and bending strength of ECC specimens increase first and then decrease with the increase of fly ash content,and when fly ash content is 1.2,the tensile strain-hardening characteristics of ECC are obvious,and the most obvious ultimate tensile strain could be more than 4.7%.With the increase of water-binder ratio,the tensile strength and bending strength of ECC decrease,but the ultimate tensile strain increases and the tensile strain-hardening characteristics are obvious.The tensile strength,ultimate tensile strain and bending strength of ECC could be improved obviously with the increase of PVA volume ratio.
作者
孔燕
邵永健
杜亮
傅少华
李国建
KONG Yan;SHAO Yong-jian;DU Liang;FU Shao-hua;LI Guo-jian
出处
《混凝土与水泥制品》
北大核心
2019年第12期61-65,共5页
China Concrete and Cement Products
基金
2018年江苏省研究生科研创新计划项目(KYCX18_2558)
