摘要
采用三点弯曲试验研究了玄武岩纤维编织网增强混凝土(BTRC)抗弯性能.试验考虑了编织网层数、编织网上预拉力水平和钢纤维掺量3个影响因素.试验结果表明:随着编织网层数的增加,BTRC板的抗弯强度和韧性增大.随编织网上预拉力水平的提高,BTRC板的开裂应力和开裂后抗弯刚度均增大,极限挠度减小,而抗弯强度变化不明显.钢纤维有助于提升BTRC板的开裂应力、抗弯强度和韧性;对编织网施加预拉力使钢纤维掺量对BTRC板的抗弯强度影响更显著.编织网层数和钢纤维的增加使BTRC板上的裂缝形态更均匀细密,但对编织网施加预拉力使板上裂缝数目减少且裂缝间距增大.
The three-point bending tests were conducted to investigate the effects of various textile layers,steel fibers volume contents and prestress levels on the flexural behavior of Basalt Textile Reinforced Concrete(BTRC)plates.With the increase of textile layers,the flexural strength and toughness of BTRC plate are improved.Prestress on the textiles improves the first crack stress and the post-cracking flexural stiffness,but decreases the ultimate deflection of BTRC plate,while no obvious change occurs for the flexural strength.Adding steel fibers in matrix is revealed to positively affect the first crack stress,flexural strength and toughness of BTRC plate,and the effect of steel fibers on the flexural strength is more prominent after applying prestress on the textiles.Moreover,the increase of textile layers and the presence of steel fibers contribute to the crack pattern characterized by more and finer cracks;however,prestress on the textile reduces the crack number and increases the crack spacing.
作者
杜运兴
张忻颖
周芬
张蒙蒙
DU Yunxing;ZHANG Xinying;ZHOU Fen;ZHANG Mengmeng(Key Laboratory for Green&Advanced Civil Engineering Materials and Application Technology of Hunan Province,Hunan University,Changsha 410082,China;College of Civil Engineering,Hunan University,Changsha 410082,China)
出处
《湖南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2020年第5期116-123,共8页
Journal of Hunan University:Natural Sciences
基金
湖南省自然科学基金资助项目(2018JJ2043)
长沙市科技计划重大专项资助项目(kq1703002,kq1804002,kq1902043)
长沙市科技计划资助项目(kq1907101)。
