纤维再生微粉水泥基复合材料断裂性能分析  

Fracture properties of fiber recycled powder cementitious composites

作　　者：范思琦 李秀领[1,2] 郭强[3] FAN Siqi;LI Xiuling;GUO Qiang(School of Civil Engineering,Shandong Jianzhu University,Jinan,Shandong 250101,China;Key Laboratory of Building Structural Retrofitting and Underground Space Engineering,Ministry of Education,Shandong Jianzhu University,Jinan,Shandong 250101,China;The Second Construction Limited Company of China Construction Eighth Engineering Division,Jinan,Shandong 250101,China)

机构地区：[1]山东建筑大学土木工程学院,山东济南250101 [2]山东建筑大学建筑结构加固改造与地下空间工程教育部重点实验室,山东济南250101 [3]中建八局第二建设有限公司,山东济南250101

出　　处：《福州大学学报（自然科学版）》2023年第2期279-285,共7页Journal of Fuzhou University(Natural Science Edition)

基　　金：国家自然科学基金(面上)资助项目(52278507);山东省自然科学基金资助项目(ZR2020ME245);山东省重点研发计划(重大科技创新工程)资助项目(2021CXGC011204)。

摘　　要：基于三点弯曲试验,研究水胶比、再生微粉取代率、纤维种类对纤维再生微粉水泥基复合材料(FRPCC)断裂性能的影响.根据双K断裂参数分析各因素对FRPCC的增韧效果,并结合微观形貌分析各因素对FRPCC韧性的改善机制.结果表明:水胶比增大使纤维再生微粉水泥基复合材料失稳韧度先升高后降低;断裂韧度随着再生微粉取代率提升呈现先增后减的趋势;单掺玄武岩纤维(BF)会使FRPCC脆性增加,聚乙烯醇纤维(PVA纤维)占比增大能够明显提升FRPCC的断裂韧度;当水胶比为0.28、再生微粉取代率为45%、复掺0.2%玄武岩纤维和1.7%PVA纤维时,微观结构紧密,断裂韧度最优.Based on the three-point bending test,the influence of water-binder ratio,recycled powder content,fiber type on the fracture performance of the fiber recycled powder cementitious composites(FRPCC)was studied.According to the double K fracture parameters,the toughening effect of each factor on the fiber recycled powder cementitious composites was analyzed,and the improving mecha­nism of each factor on the cementitious composites toughness was illustrated combined with the micro­scopic morphology.The results show that:with the increase of the water-binder ratio,the instability toughness of the fiber recycled powder cementitious composites increases first and then decreases.The fracture toughness shows a trend of increasing first and then decreasing with the improvement of recy­cled powder content.The single basalt fiber will increase the brittleness of the cementitious compos-ites,and the increase in proportion of PVA fibers can significantly improve the fracture toughness of the cementitious composites.When the water-binder ratio is 0.28,the replacement rate of recycled powder is 45%,and mixed with 0.2%basalt fiber and 1.7%PVA fiber,the fracture toughness is optimal,and the microstructure is compact.

关 键 词：纤维再生微粉水泥基复合材料 BF-PVA混杂纤维 三点弯曲试验 断裂性能 双K断裂参数 

分 类 号：TU528.57[建筑科学—建筑技术科学]