摘要
为提高水泥基增强复合材料(ECC)经济效益并控制修复周期,以较低成本的聚丙烯纤维和快硬早强硫铝酸盐水泥为关键组材,设计聚丙烯纤维硫铝酸盐水泥基(PP-SACC)修复材料,并探究水胶比、纤维掺量及骨料粒径对修复材料弯曲性能的影响规律,联用灰色关联模型对PP-SACC各工况进行综合评价.研究结果表明:纤维掺量是影响强度、韧性及裂缝特性最重要的因素,纤维掺量对初裂强度、韧性指标及平均裂缝宽度的影响因子分别为−0.68、0.79和−0.98;骨料粒径对裂缝特性同样有明显的影响,石英砂尺寸对平均裂缝宽度的影响因子为−0.86;水胶比对强度和韧性也有着显著的影响,合理的水胶比更有利于充分发挥纤维的桥连效应;PP-SACC修复材料在具备优异韧性的同时具有挠曲硬化特性.
To improve the economic benefits of engineered cementitious composite(ECC)and control the repair cycle,the polypropylene fiber-sulfoaluminate cement-based(PP-SACC)repair materials were designed with polypropylene fiber featuring low cost and sulfoaluminate cement featuring fast hardening and early strength employed as the key components.The influence of water-binder ratio,fiber content,and aggregate size on the bending properties of the repair materials was explored.In addition,the grey relation model was used to comprehensively evaluate PP-SACC under all working conditions.The results indicate that the fiber content is the most important factor that affects the strength,toughness,and crack characteristics.The influence factors of fiber content on initial crack strength,toughness index,and average crack width are−0.68,0.79,and−0.98,respectively.The aggregate size can significantly affect the crack characteristics.The influence factor of quartz sand size on the average crack width is−0.86.The water-binder ratio also greatly affects the strength and toughness,and a reasonable water-binder ratio is beneficial to leverage the bridging effect of the fiber.The PPSACC repair material has excellent toughness and flexural hardening properties.
作者
崔圣爱
夏葳
徐李麟
张书豪
李固华
CUI Sheng’ai;XIA Wei;XU Lilin;ZHANG Shuhao;LI Guhua(School of Civil Engineering,Southwest Jiaotong University,Chengdu 610031,China)
出处
《西南交通大学学报》
EI
CSCD
北大核心
2024年第6期1497-1504,共8页
Journal of Southwest Jiaotong University
基金
国家自然科学基金项目(52278277)
四川省国际科技创新合作项目(2023YFH0061)
四川省中央引导地方科技发展专项项目(2021ZYD0045)
成都市科技计划(2021-YF05-00138-SN)
中央高校基本科研业务费专项资金(2682021GF020)。
关键词
PP纤维-硫铝酸盐水泥基修复材料
弯曲延性
挠曲硬化
改进灰色关联分析
polypropylene fiber-sulfoaluminate cement-based repair materials
bend ductility
flexural hardening
improved grey relation analysis
作者简介
第一作者:崔圣爱(1981-),女,教授,博士,研究方向为桥梁结构动力学性能及土木工程新材料,E-mail:shengai_cui@126.com;通信作者:李固华(1963-),男,教授,博士,研究方向为土木工程材料性能,E-mail:lgh-100@vip.163.com。
