再生卵石骨料混凝土力学性能及其应力-应变本构关系

发布时间：2018-06-18 14:37

本文选题：再生混凝土 + 卵石骨料　；参考：《应用基础与工程科学学报》2014年04期

【摘要】：采用以卵石为粗骨料的原生混凝土作为再生混凝土来源,通过破碎、筛分获取再生卵石粗骨料,配制再生卵石骨料混凝土.以取代率为变化参数,设计99个试件.通过试验,获取其立方体抗压强度、棱柱体抗压强度、抗折强度、弹性模量、泊松比等力学性能指标及应力-应变全过程曲线.分析了再生卵石骨料混凝土损伤演化、变形和能量耗散等力学性能.采用分段式本构关系模型和损伤本构关系模型对再生混凝土的应力-应变本构关系进行研究,并提出相应的本构方程.结果表明,与天然混凝土相比,再生卵石骨料混凝土的抗压、抗折强度略为增大,而弹性模量、变形系数与耗能系数则有不同程度的降低;不同取代率下,再生混凝土应力-应变曲线与天然混凝土相似,但下降段变得陡峭;再生混凝土损伤发展较为迅速,尤其在ε=(3~5)×10-3之间;分段式本构方程和损伤本构方程的计算结果均与实测值吻合较好.
[Abstract]:The primary concrete with pebble as coarse aggregate was used as the source of recycled concrete. The recycled gravel aggregate was obtained by crushing and sieving, and the recycled aggregate concrete was prepared. 99 specimens were designed with substitution rate as variable parameters. The mechanical properties such as cube compressive strength, prism compressive strength, flexural strength, elastic modulus, Poisson's ratio and stress-strain curves were obtained. The damage evolution, deformation and energy dissipation of recycled pebble aggregate concrete were analyzed. The stress-strain constitutive relation of recycled concrete is studied by means of segmental constitutive model and damage constitutive relation model, and the corresponding constitutive equation is proposed. The results show that, compared with natural concrete, the compressive strength of recycled pebble aggregate concrete increases slightly, while the elastic modulus, deformation coefficient and energy dissipation coefficient decrease to some extent. The stress-strain curve of recycled concrete is similar to that of natural concrete, but the descending section becomes steep, and the damage of recycled concrete develops rapidly, especially in the range of 蔚 ~ (3 ~ (-3) 脳 10 ~ (-3). The calculated results of segmented constitutive equation and damage constitutive equation are in good agreement with the measured values.
【作者单位】：广西大学土木建筑工程学院;广西大学工程防灾与结构安全教育部重点实验室;
【基金】：国家自然科学基金资助项目(50908057,51268004) “八桂学者”建设工程专项经费资助广西科技攻关资助项目(桂科攻12118023-3) 广西自然科学基金项目(2012GXNSFAA053203) 广西理工科学实验中心重点项目(LGZX201102)
【分类号】：TU528

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