再生混凝土单轴受拉性能试验研究

Investigation on the Tensile Behavior of Recycled Aggregate Concrete

通过5组再生混凝土棱柱体试件的单轴直接拉伸试验,探讨了相同有效水灰比之下,再生粗骨料取代率对再生混凝土抗拉强度与变形的影响规律.结果表明,随着再生粗骨料取代率从0增加到100%,再生混凝土的抗拉强度与受拉原点切线模量逐渐下降,而峰值拉应变呈略微增加趋势.在对试验数据进行统计回归的基础上,最后提出了包括受拉本构关系在内的再生混凝土受拉性能计算公式,该公式可在再生混凝土结构和构件的非线性分析中参考使用.

This paper deals with the experimental investigation on the uniaxial tensile behavior of recycled aggregate concrete （RAC） with the same effective water/cement ratio but different recycled coarse aggregate （RCA） contents. 5-Groups of test results show that with an increase of the recycled coarse aggregate replacement percentage the peak tensile strain of the RAC is slightly increased whereas the tensile strength and the tangent modulus of the RAC are decreased. At the end of this paper, several equations related to the axial tensile properties as well as the tensile stress-strain relationship are proposed and recommended based on the regress analysis.