纤维编织网增强SHCC高温力学性能  

Mechanical properties of basalt textile reinforcement SHCC exposed to elevated temperature

作　　者：李泽虎 周健 徐名凤 李辉 LI Zehu;ZHOU Jian;XU Mingfeng;LI Hui(School of Civil Engineering and Transportation,Hebei University of Technology,Tianjin 300401,China)

机构地区：[1]河北工业大学土木与交通学院,天津300401

出　　处：《河北工业大学学报》2025年第2期70-77,共8页Journal of Hebei University of Technology

基　　金：国家自然科学基金资助项目(51878238)。

摘　　要：为改善玄武岩纤维增强高延性水泥基复合材料(BF-SHCC)的延性和耐高温性能,本文采用玄武岩纤维编织网(BT)增韧BF-SHCC,制备出玄武岩纤维编织网增强BF-SHCC (BTR/BF-SHCC),并研究BFSHCC和BTR/BF-SHCC在常温(20℃)、100、200、400、600、800℃这6种温度工况下的拉伸性能。试验结果表明:BT增韧效果显著,各个温度下,BTR/BF-SHCC的极限拉伸应变、极限拉伸强度和能量吸收能力均明显高于BF-SHCC。常温下,BF-SHCC和BTR/BF-SHCC均表现出应变硬化和多缝开裂特性;与BFSHCC相比,BTR/BF-SHCC的极限拉伸应变、极限拉伸强度和能量吸收能力分别提高了91%、64%和169%。高温作用对BF-SHCC和BTR/BF-SHCC拉伸性能影响明显,100℃高温作用后,BF-SHCC保持着应变硬化和多缝开裂特性;200℃高温作用后,其应变硬化和多缝开裂特性丧失。100、200、400℃高温作用后,BTR/BF-SHCC均表现出应变硬化和多缝开裂特性,且随着温度升高其极限拉伸应变逐渐增大;600℃高温作用后,其应变硬化和多缝开裂特性丧失。In order to improve the ductility and high temperature resistance of basalt fiber reinforced strain-hardening cementitious composites(BF-SHCC),we use basalt textile(BT)to toughen BF-SHCC to prepare BTR/BF-SHCC.Tensile properties of BF-SHCC and BTR/BF-SHCC have been studied at room temperature(20℃),and after exposure to 100,200,400,600,800℃.The results show that basalt textile toughening effect is remarkable.At each temperature,the ultimate tensile strength,ultimate tensile strain and energy absorption capacity of BTR/BF-SHCC were higher than those of BF-SHCC.Both BF-SHCC and BTR/BF-SHCC exhibit strain hardening and multi-crack cracking properties at room temperature.Compared with BF-SHCC,the ultimate tensile strength,ultimate tensile strain and energy absorption capacity of BTR/BF-SHCC were increased by 64%,91%and 169%,respectively.The effect of high temperature on the tensile properties of BF-SHCC and BTR/BF-SHCC is obvious.After exposure to 100℃,BF-SHCC showed strain-hardening and multiple-cracking characteristics.After exposure to 200℃,BF-SHCC lost strain-hardening and multiple-cracking characteristics.BTR/BF-SHCC exhibited strain hardening and multi-crack cracking properties after exposure to high temperatures of 100,200 and 400℃,and the ultimate tensile strain increased gradually with the increase of temperature.After exposure to 600℃,BTR/BF-SHCC lost strain-hardening and multiple-cracking characteristics.

关 键 词：玄武岩纤维 纤维编织网增韧 SHCC 高温 拉伸性能 

分 类 号：TU528.58[建筑科学—建筑技术科学]