氯盐环境下纤维编织网增强混凝土拉伸性能

摘要

通过拉伸试验研究了氯盐干湿、氯盐冻融循环和常规环境下纤维编织网层数、种类以及氯盐浓度和循环次数等因素对纤维编织网增强混凝土(纤维/混凝土)拉伸性能的影响.结果表明:三种环境下,增加纤维编织网层数均可提高纤维/混凝土的拉伸性能,且碳纤维编织网较玄武岩纤维编织网的增强作用更明显;氯盐浓度、干湿或冻融循环次数对纤维/混凝土拉伸极限荷载影响不明显;常规环境和氯盐干湿循环下,掺入短切聚乙烯醇(PVA)纤维和耐碱玻璃(AR-glass)纤维均可以提高纤维/混凝土的拉伸极限荷载;氯盐冻融循环下,掺入短切PVA纤维的纤维/混凝土的拉伸极限荷载未有提高,而掺入短切AR-glass纤维的纤维/混凝土的拉伸极限荷载增大.%The tensile properties of the textile reinforced concrete fiber/concrete were investigated by the tensile test under different environments.The effects of the number of textile layers,the type of the textile,the concentration of the chloride salt and the number of cycles on the fiber/concrete were investigated under the chloride salt drywet cycle,freezing-thawing cycle and the conventional environment.The results show that the tensile properties of fiber/concrete can be improved by increasing the number of textile layers in the three kinds of environmental types,and the reinforcing effect of carbon fiber is more obvious than basalt fiber.The concentration of chloride and the number of dry-wet cycle or freezing-thawing cycle have no significant effect on fiber/concrete's tensile ultimate load.The tensile ultimate load of fiber/concrete can be increased by adding short-cut PVA (poly(vinyl alcohol)) fiber and AR(alkali-resistant)-glass fiber under the conventional environment and chlorine salt dry-wet cycle.Under the chloride salt freezing-thawing cycle,the tensile ultimate load of the fiber/concrete is not increased by the addition of PVA short-cut fiber,but increased by the addition of AR-glass short-cut fiber.