基于正交试验的废弃纤维再生混凝土劈裂抗拉强度影响分析  

Experimental study on splitting tensile strength of waste fiber recycled concrete based on orthogonal design

作　　者：康天蓓[1] 李松旭 金立伟 周静海[1] 戚玥 KANG Tianbei;LI Songxu;JIN Liwei;ZHOU Jinghai;QI Yue(School of Civil Engineering,Shenyang Jianzhu University,Shenyang 110168,China;School of Civil Engineering,Shenyang Urban Construction University,Shenyang 110168,China)

机构地区：[1]沈阳建筑大学土木工程学院,辽宁沈阳110168 [2]沈阳城市建设学院土木工程学院,辽宁沈阳110168

出　　处：《混凝土》2022年第8期78-81,共4页Concrete

基　　金：国家自然科学基金(51678374);辽宁省教育厅科学研究项目(lnqn202003);辽宁省高等学校创新团队(LT2019011)。

摘　　要：采用再生粗骨料全部或部分替代天然骨料,并加入废弃地毯纤维作为增强纤维制备废弃纤维再生混凝土。设计正交试验,通过极差和方差分析法研究水灰比、再生骨料取代率、废弃纤维体积掺入量三个因素三个水平对劈裂抗拉强度的影响。试验结果表明,水灰比对劈裂抗拉强度影响显著,其次为废弃纤维体积掺入量。随着再生骨料取代率的增加劈裂抗拉强度减小,加入废弃纤维可以有效提高再生混凝土劈裂抗拉强度。废弃纤维再生混凝土制备的较优组合为水灰比0.45,再生骨料取代率50%,废弃纤维体积掺入量0.12%。建立了废弃纤维再生混凝土劈裂抗拉强度多因素线性回归模型,验证了模型的适用性和准确性,并通过权重评价各因素的影响规律。The research object is waste fiber recycled concrete.Waste fiber recycled concrete is prepared by replacing all or part of natural aggregates with recycled coarse aggregates and adding waste carpet fibers as reinforcement fibers.Based on the design of orthogonal experiment,the range analysis and variance analysis were used.The influence of water-cement ratio,replacement ratio of recycled aggregates and waste fiber volume on splitting tensile strength was studied.The results show that the water-cement ratio has a significant effect on the splitting tensile strength,followed by the waste fiber volume.With the increase of replacement rate of recycled aggregates,the splitting tensile strength of recycled concrete decreases,and the addition of waste fibers can effectively improve the splitting tensile strength of recycled concrete.The optimal combination of recycled concrete with waste fiber is 0.45 water cement ratio,50% recycled aggregate replacement rate and 0.12% waste fiber volume.The multi factor linear regression model of splitting tensile strength of waste fiber recycled concrete was established to verify the applicability and accuracy of the model,and the influence law of factors is evaluated by weight.

关 键 词：再生粗骨料 废弃纤维 正交设计 劈裂抗拉强度 极差分析 方差分析 多元线性回归模型 

分 类 号：TU528.572[建筑科学—建筑技术科学]