基于响应面法和Weibull分布的不锈钢纤维再生混凝土抗冻性能研究

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中文摘要：[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R2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。

外文标题：Study on frost resistance of stainless steel fiber recycled concrete based on Response Surface Method and Weibull distribution

外文摘要：[Objective]In the severe cold region of China,freeze-thaw damage can cause recycled concrete(RAC)structures to reach the durability limit earlier or even lead to component failure,to prolong the service life of recycled concrete(RAC)struc-tures in severe cold region,[Methods]freeze-thaw cycling tests were conducted on recycled concrete(RAC),natural concrete(NC),plain steel fiber recycled concrete(PFRAC)and stainless steel fiber recycled concrete(SFRAC)were subjected to freeze-thaw cycle tests.After freeze-thaw cycles,the mass loss and relative dynamic elastic modulus of RAC,NC,PFRAC,and SFRAC were measured to analyze the internal damage mechanism and deterioration law of concrete during freeze-thaw cycles.The relative dynamic elastic modulus was used as the damage variable,and a freeze-thaw damage model for steel fiber recycled con-crete was established based on the Response Surface Model(RSM)and the Weibull distribution to study the effects of the num-ber of freeze-thaw cycles and the admixture of PF and SF on the frost resistance of recycled concrete.[Results]The result show that SF incorporation can effectively delay the loss of mass and the decrease of the relative dynamic elastic modulus of RAC.At 150 freeze-thaw cycles,the mass loss and relative dynamic elastic modulus of SFRAC with 2％dosage decreased by 3.01％and 19.57％,respectively.The mass loss rate of SFRAC was reduced by 0.4％and the relative dynamic elastic modulus increased by 14.17％compared with that of RAC.[Conclusion]The prediction result of Weibull distribution and Response Surface Modeling(RSM)are basically the same,but the relative error of the predicted value of RSM is lower than that of Weibull distribution.The correlation coefficients R2 of the two models are above 0.94,and the prediction result are more accurate,which can provide theo-retical references for the use of steel fiber recycled concrete in cold regions.

外文关键词：

recycled concretestainless steel fibersrelative dynamic modulus of elasticityWeibull distributionfreeze-thaw cycleResponse Surface Method(RSM)mechanical propertiesinfluence factor

作者：

钟楚珩、范祖伟、周金枝、施佳楠

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作者单位：

湖北工业大学土木建筑与环境学院,湖北武汉 430068

桥梁结构健康与安全国家重点实验室,湖北武汉 430034

关键词：

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

基金：

国家自然科学基金湖北省高等学校优秀中青年科技创新团队项目湖北工业大学博士启动基金

项目编号：

52208340T2022010BSQD2020051

出版年：

2024

DOI：

10.13928/j.cnki.wrahe.2024.02.005

水利水电技术(中英文)

水利部发展研究中心

水利水电技术(中英文)

CSTPCD北大核心

影响因子：0.456

ISSN：1000-0860

年,卷(期)：2024.55(2)

参考文献量31