基于灰色关联理论的PP-SACC修复材料弯曲性能
Bending Properties of Polypropylene Fiber-Sulfoaluminate Cement-Based Repair Material Using Grey Relation Theory
崔圣爱 1夏葳 1徐李麟 1张书豪 1李固华1
作者信息
- 1. 西南交通大学土木工程学院,四川 成都 610031
- 折叠
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.
Abstract
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 PP-SACC repair material has excellent toughness and flexural hardening properties.
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Key words
polypropylene fiber-sulfoaluminate cement-based repair materials/bend ductility/flexural hardening/improved grey relation analysis引用本文复制引用
出版年
2024
国家科技期刊平台
NSTL
万方数据