摘要
研究目的:基于现阶段纤维超韧性水泥基工程材料的原材料选择随意、优化繁琐等问题,本文通过对8组复合材料进行力学、工作等性能测试,并结合经济性能,构建综合型多指标灰色关联决策模型,优化出最佳材料组合,最后通过单轴拉伸试验验证分析最佳组的优良韧性及应变硬化特性,为其工程推广应用提供一定的理论参考。研究结论:(1)养护龄期对各组复合材料的力学性能有显著影响,其中28 d龄期的性能更优越;(2)由12 mm聚乙烯醇纤维(简称PVA)、40~70目石英砂组成的复合材料抗压、抗折强度均为最佳,抗裂性能较好;(3)由6 mm PVA纤维、20~40目石英砂组成的复合材料抗拉强度最高,拉伸性能最显著;(4)由6 mm PP纤维、40~70目石英砂组成的复合材料工作性能最佳,方便于施工与科研试验的搅拌等工作;(5)由12 mm PP纤维、40~70目石英砂组成的复合材料的灰色关联决策综合性能最好,其极限拉应变大约是普通混凝土的300~400倍,有显著的拉伸韧性,推荐其作为提高结构使用寿命的工程韧性材料。
Research purposes:Based on the problems of random selection and optimization of raw materials for fiber-to-toughness cement-based engineering materials at present,this paper conducts mechanical and working performance tests on 8 composite materials,and combines economic performance to construct a comprehensive multi-index gray correlation decision model,which is used to optimize the optimal material combination.Finally,the uniaxial tensile test is used to verify the excellent toughness and strain hardening characteristics of the best group,which provides a theoretical reference for its engineering application.Research conclusions:(1) The curing age has a significant effect on the mechanical properties of each group of composite materials,of which 28 d age performance is superior.(2) The composite materials composed of 12 mm polyvinyl alcohol fiber (referred to as PVA) and 40-70 mesh quartz sand are the best in compression and flexural strength,and have good crack resistance.(3) The composite materials composed of 6 mm PVA fiber and 20-40 mesh quartz sand have the highest tensile strength and the most remarkable tensile properties.(4) The composite materials consisting of 6 mm PP fiber and 40-70 mesh quartz sand have the best working performance,which is convenient for mixing in the construction and scientific research test.(5) The composite materials composed of 12 mm PP fiber and 40-70 mesh quartz sand have the best comprehensive performance of gray correlation decision.The ultimate tensile strain is about 300-400 times of that of ordinary concrete,and it has significant tensile toughness.It is recommended as an engineering tough material to improve the service life of the structure.
作者
李福海
靳贺松
王江山
李瑞
何肖云峰
胡丁涵
周双
LI Fuhai;JIN Hesong;WANG Jiangshan;LI Rui;HE Xiaoyunfeng;HU Dinghan;ZHOU Shuang(Southwest Jiaotong University,Chengdu,Sichuan 610031,China;Shenzhen BYD Company Limited,Shenzhen,Guangdong 518118 ,China)
出处
《铁道工程学报》
EI
北大核心
2019年第5期90-96,101共8页
Journal of Railway Engineering Society
基金
国家自然科学基金项目(51308471)
国家重点研发计划(2017YFB1201204)
中央高校基本科研业务费专项资金资助项目(2682015ZD13).
关键词
纤维水泥基复合材料
原材料选择与优化
力学性能
经济指标
灰色关联
fiber cement-based composites
raw material selection and optimization
mechanical properties
economic indicators
grey correlation
作者简介
李福海,1979年出生,男,高级工程师。