摘要
Abstract
In order to meet the comprehensive performance requirements of building materials for foundation pit support engineering construction,a new type of fiber-reinforced composite material suitable for foundation pit support engineering was prepared using epoxy resin and curing agent as base materials,mixed fibers(glass fiber and carbon fiber)and nano silica as reinforcement materials,and its mechanical properties and aging resistance were investigated.The experimental results show that as the mass fraction of nano silica gradually increases,the tensile strength,compressive strength,and bending strength of the new fiber-reinforced composite material show a trend of first increasing and then decreasing.When the amount of nano silica added is 0.3％,the comprehensive mechanical properties of the new fiber-reinforced composite material reach the best.The aging resistance of the new fiber-reinforced composite material is strong.When the aging temperature is 90 ℃ and aged in salt water with a mineralization degree of 35600 mg/L for 16 days,the weight loss rate is only 0.47％.The reduction rates of tensile strength,compressive strength,and bending strength are all less than 5％,and the mechanical properties are relatively stable.The research results indicate that the new fiber-reinforced composite material has excellent mechanical properties and aging resistance,which can meet the comprehensive performance requirements of building materials for foundation pit support engineering construction.关键词
纤维增强复合材料/基坑支护/建筑材料/力学性能/耐老化性能Key words
fiber reinforced composite materials/excavation support/building material/mechanical properties/aging resistance分类
化学化工
