钟楚珩,范祖伟,周金枝,施佳楠

• 1:湖北工业大学土木建筑与环境学院
• 2:桥梁结构健康与安全国家重点实验室

摘要(Abstract)：

【目的】在我国严寒地区，冻融损伤会使再生混凝土(RAC)结构提前达到耐久性极限甚至导致构件失效，为了延长再生混凝土(RAC)结构在严寒地区的使用寿命，【方法】对再生混凝土(RAC)、天然混凝土(NC)、普通钢纤维再生混凝土(PFRAC)和不锈钢纤维再生混凝土(SFRAC)进行冻融循环试验。经过冻融循环后，测得RAC、NC、PFRAC、SFRAC的质量损失及相对动弹性模量，分析冻融循环过程中混凝土内部的损伤机理及劣化规律。以相对动弹性模量为损伤变量，基于响应面模型(RSM)和Weibull分布建立了钢纤维再生混凝土冻融损伤模型，研究冻融循环次数、PF和SF的掺量对再生混凝土抗冻性的影响。【结果】结果表明，SF的掺入能有效延缓RAC质量的损失和相对动弹性模量的降低。冻融循环150次时，掺量为2%的SFRAC质量损失和相对动弹性模量分别下降3.01%和19.57%。SFRAC与RAC相比，质量损失率降低了0.4%,相对动弹性模量提高了14.17%。【结论】Weibull分布和响应面模型(RSM)的预测结果 基本一致，但RSM预测值的相对误差要低于Weibull分布的预测值。两种模型的相关系数R~2均在0.94以上，预测结果较为准确，可为钢纤维再生混凝土在寒冷地区的使用提供理论参考。

关键词(KeyWords)： 再生混凝土;不锈钢纤维;相对动弹性模量;冻融循环;Weibull分布;响应曲面(RSM);力学性能;影响因素

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金项目(52208340);; 湖北省高等学校优秀中青年科技创新团队项目(T2022010);; 湖北工业大学博士启动基金(BSQD2020051)

作者(Author): 钟楚珩,范祖伟,周金枝,施佳楠

DOI: 10.13928/j.cnki.wrahe.2024.02.005

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