硅粉对道路混凝土抗盐冻性能的影响  

Influence of Silica Fume on Salt Frost Resistance of Road Concrete

作　　者：谢国栋[1] 韩超[2] 

机构地区：[1]天津市市政工程设计研究院,天津300051 [2]江苏省交通科学研究院股份有限公司,江苏南京211112

出　　处：《公路工程》2012年第6期214-217,共4页Highway Engineering

摘　　要：以盐溶液为冻融介质,并在冻融循环后对不同硅粉掺量的混凝土试件进行相对动弹模量、抗压强度、劈裂强度、抗折强度等测试,比较分析了不同硅粉掺量的混凝土试件的抗盐冻性能,进而给出合适的硅粉掺量建议值。通过试验,认为当质量损失率不足5%时,各强度指标均有大幅下降;当相对动弹模量未下降至60%以下时,抗折强度仍有较大幅度的下降,因此建议评价混凝土抗冻性时应考虑强度指标特别是抗折强度的下降。Relative dynamic elastic modulus,compressive strength,cleavage strength and flexural strength of concrete with different admixture amounts of silica fume were tested after freeze-thaw cycles in salt solution,and through the comparison and analysis,the salt frost resistant property of concrete with different admixture amounts of silica fume were obtained,and suggested values of admixture amounts were given.Through tests,when the loss rate of mass was lower than 5% or relative dynamic elastic modulus was higher than 60%,the strength index,especially the flexural strength were dropt greatly,so flexural strength should be consider when frost resistance were evaluated.

关 键 词：硅粉 盐冻 质量损失率 抗折强度 评价指标 

分 类 号：U414.1[交通运输工程—道路与铁道工程]