摘要
采用快冻法试验研究高韧性纤维增强水泥基复合材料(ECC)的抗冻融耐久性能,并与混凝土和砂浆抗冻融性能进行对比,分析国产与进口聚乙烯醇(PVA)纤维对ECC抗冻融性能的影响规律,探讨砂灰比对ECC抗冻性的影响.结果表明:300次冻融循环后,掺入国产和进口PVA纤维的ECC质量损失率分别控制在2.5%和1.5%以内;ECC的纵向相对动弹性模量比混凝土和砂浆提高1.62～1.87倍;ECC的横向相对动弹性模量比混凝土和砂浆提高1.61～1.79倍.随着砂灰比的增加,ECC质量损失率逐渐增加;ECC纵向与横向相对动弹性模量稍有增加.ECC抗冻等级高于F300,完全可用于寒冷地区混凝土结构的加固与维护.
The durability properties of high toughness fiber reinforced cementitious composites （ECC） under freezing and thawing cy- cles are researched by quick frozen method and compared with concrete and mortar. The influences of ECC blending domestic and im- ported PVA fibers with different sand-cement ratios on durability properties are analyzed. The results show that after 300 freezing and thawing cycles, the mass loss rates of ECC blending domestic and imported PVA fibers are separately 2.5% and 1.5% ; longitudinal relative dynamic modulus of elasticity of ECC improves 1.62 - 1.87 times than concrete and mortar; transversal relative dynamic modu- lus of elasticity of ECC is 1.61 - 1.79 times than concrete and mortar; the mass loss rates, longitudinal and transversal relative dynamic modulus of elasticity of ECC are raising with the increase of sand-cement radios; the frost resistance grade of ECC is higher than F300, and ECC could repair and strengthen concrete structures in cold regions.
出处
《华北水利水电学院学报》
2013年第1期16-19,共4页
North China Institute of Water Conservancy and Hydroelectric Power
关键词
高韧性纤维增强水泥基复合材料(ECC)
冻融循环
动弹性模量
high toughness fiber reinforced cementitious composites （ECC）
freezing and thawing cycle
dynamic modulus of elasticity
