高韧性植物纤维增强水泥基材料单轴拉伸试验研究  

Research on Direct Tensile Experiments of High Ductile Vegetable Fiber Reinforced Cementitious Composites

作　　者：尚君[1] 赵铁军[1] 王兰芹[1,2] 郭思瑶[1] 王鹏刚[1] SHANG Jun;ZHAO Tie-jun;WANG Lan-qin;GUO Si-yao;WANG Peng-gang(School of Civil Engineering,Qingdao University of Technology,Qingdao 266033,China;School of Civil Engineering,Shandong Jianzhu University,Jinan 250101,China)

机构地区：[1]青岛理工大学土木工程学院,青岛266033 [2]山东建筑大学土木工程学院,济南250101

出　　处：《硅酸盐通报》2019年第1期218-223,230,共7页Bulletin of the Chinese Ceramic Society

基　　金：国家自然科学基金重点国际(地区)合作研究项目(51420105015);国家自然科学基金青年基金(51508293);国家重点基础研究发展计划"973"项目(2015CB655100);山东省自然科学基金(ZR2016EEP01)

摘　　要：从绿色经济角度出发,以获得较高韧性为目的,采用短切内掺及长纤维分层平铺两种制备工艺,通过单轴拉伸试验获得四种植物纤维增强水泥基材料的拉伸特性,并对材料成本进行分析。试验结果表明:内掺短切苎麻纤维与剑麻纤维试件虽表现出应变软化特征但在开裂后具有较好的应力水平保留率。竹原、大麻、剑麻及苎麻纤维分层平铺试件均表现出明显应变硬化特征且极限拉应变均达到2%以上,而剑麻纤维分层平铺试件拉伸性能优越且成本较低有利于进一步的研究与推广应用。From the point of view of developing green and low cost materials,four kinds of vegetable fibers,including bamboo fiber,sisal fiber,hemp fiber and ramie fiber,were used to reinforce cementitious composites to get higher ductility.Specimens were casted with random short fiber and aligned long fiber.Direct tensile performance of specimens was tested and analyzed.Also the cost of materials was analyzed.The results show that specimens with short ramie and sisal fiber perform strain softening but better stress retention rate after cracking.Furthemore,all specimens with aligned long fiber perform strain hardening characteristics and the ultimate tensile strain can reach above 2%.In particular aligned long sisal fiber reinforced specimens show excellent tensile property and low cost,which would be more favorable to further development and application.

关 键 词：植物纤维 水泥基材料 单轴拉伸试验 应变硬化 

分 类 号：TU528.572[建筑科学—建筑技术科学]