再生保温混凝土受拉应力应变全曲线的研究

关键字：再生保温混凝土；单轴拉伸；应力应变全曲线；

（1.太原理工大学 力学学院，山西 太原  030024；2.太原理工大学 建筑与土木工程学院，山西 太原  030024）

    摘要：利用刚性框架法得出完整的再生保温混凝土（RATIC）受拉应力应变全曲线，对再生粗骨料取代率分别为0、30%、50%、70%、100%的RATIC抗拉性能进行了系统的研究，确定了RATIC的受拉性能特征值，得到了RATIC的受拉应力应变全曲线。结果表明，RATIC受拉应力应变全曲线与普通混凝土相似，抗压强度相同时，未掺加再生粗骨料的RATIC的变形能力比普通混凝土提升25.8%，弹性模量降低34.4%。RATIC的变形能力随着再生粗骨料取代率的增大而逐渐减小，弹性模量的变化较小，受拉应力应变全曲线的下降段越来越陡。结合试验数据拟合出RATIC受拉应力应变全曲线方程。

    关键词：再生保温混凝土；单轴拉伸；应力应变全曲线；拉伸性能

    中图分类号：TU528        文献标识码：A        文章编号：1001-702X（2018）07-0028-05

 

Experimental research on stress-strain full curve of recycled

aggregate thermal insulation concrete in tension

MA Gang1，DU Sizhe1，GAO Yuxuan2，ZHANG Yu2

（1.College of Mechanics，Taiyuan University of Technology，Taiyuan 030024，China；

2.College of Architecture and Civil Engineering，Taiyuan University of Technology，Taiyuan 030024，China）

   Abstract：This study draws a complete stress-strain full curves of RATIC in tensile by using the rigid frame method，studies the tensile properties of RATIC with 0，30%，50%，70% and 100% replacement ratio，determines the tensile characteristic value，and obtained the full tensile stress and strain curve of RATIC. The test results show that shapes of stress-strain full curves of RATIC and normal concrete in tensile are similar，the deformation ability of RATIC with 0 recycled coarse aggregate replacement ratio increase 25.8% than the normal concrete with same strength，while elastic modulus decrease by 34.4%. The deformation capacity of RATIC decreases with the increase of recycled coarse aggregate replacement rate，while the elastic modulus changes less，and the decrease of stress-strain full curve in tensile becomes steeper. This paper has fit out stress-strain full curve equation of RATIC in tensile by using the test data.

    Key words：recycled aggregate thermal insulation concrete，uniaxial tensile，stress-strain full curve，tensile property