李彦军
盐碱-冻融环境下桥梁用混凝土耐久性分析
Analysis on Durability of Concrete Used in Bridge under Saline-alkali Freeze-thaw Environment
2019年第5期
盐碱环境;冻融循环;粉煤灰混凝土;质量损失;动弹性模量
Saline environment; Freeze-thaw cycles; Fly ash concrete; Mass loss; Dynamic modulus
2019年第5期
10.19761/j.1000-4637.2019.05.022.04
国家自然科学基金项目(51178455)。
李彦军
西南交通大学地球科学与环境工程学院,成都 611756
李彦军.盐碱-冻融环境下桥梁用混凝土耐久性分析[J].混凝土与水泥制品,2019(5):22-25.
LI Y J.Analysis on Durability of Concrete Used in Bridge under Saline-alkali Freeze-thaw Environment[J].China Concrete and Cement Products,2019(5):22-25.
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盐碱-冻融环境下桥梁用混凝土耐久性分析
英文名 :
Analysis on Durability of Concrete Used in Bridge under Saline-alkali Freeze-thaw Environment
刊期 :
2019年第5期
关键词 :
盐碱环境;冻融循环;粉煤灰混凝土;质量损失;动弹性模量
Key words :
Saline environment; Freeze-thaw cycles; Fly ash concrete; Mass loss; Dynamic modulus
刊期 :
2019年第5期
DOI :
10.19761/j.1000-4637.2019.05.022.04
文章编号 :
基金项目 :
国家自然科学基金项目(51178455)。
作者 :
李彦军
单位 :
西南交通大学地球科学与环境工程学院,成都 611756
李彦军
李彦军.盐碱-冻融环境下桥梁用混凝土耐久性分析[J].混凝土与水泥制品,2019(5):22-25.
LI Y J.Analysis on Durability of Concrete Used in Bridge under Saline-alkali Freeze-thaw Environment[J].China Concrete and Cement Products,2019(5):22-25.
摘要
参数
结论
参考文献
引用本文
摘 要:我国“三北地区”桥墩基础长期处于盐碱冻融环境,严重影响了桥墩基础混凝土的耐久性。以1%、2%、4%和6%的Na2SO4、NaCl和Na2SO4+NaCl作为腐蚀溶液,进行了最大冻融循环120次的不同配比粉煤灰混凝土长期性能室内试验,分析了腐蚀溶液、腐蚀溶液浓度、冻融循环次数、水灰比和粉煤灰掺量等因素对粉煤灰混凝土质量损失率和动弹性模量变化率的影响规律。研究结果表明:①相同条件下,溶液对粉煤灰混凝土的质量损失率和动弹模变化率的腐蚀作用:Na2SO4+NaCl>NaCl>Na2SO4;②粉煤灰混凝土的质量会在硫酸钠溶液中出现冻融前期增加而后期损失加剧的现象;③粉煤灰混凝土盐碱冻融循环过程中的质量损失和弹性模量减小随水胶比的增大而增大;④粉煤灰混凝土的质量损失率和动弹模变化率均随粉煤灰掺量呈现出减小的趋势。
Abstract: Saline land is widely distributed in“Three-North Area” of China. Saline corrosion and freeze-thaw cycles seriously affect the durability of concrete. Based on 1%, 2%, 4% and 6% Corrosion solution of Na2SO4, NaCl and Na2SO4+NaCl, the long-term performance indoor tests of fly ash concrete with maximum freeze-thaw cycle 120 times were conducted. The influence laws of different corrosion solutions, concentration of corrosion solution, freeze-thaw cycle times, W/C and fly ash content on the mass loss rate and dynamic elastic modulus change rate of fly ash concrete were analyzed. The results show that: ① under the same conditions, the effect order of the solution on the mass loss rate and the dynamic modulus change rate of fly ash concrete: Na2SO4+NaCl >NaCl>Na2SO4; ②the quality of fly ash concrete increases in the early freezing-thawing period and decreases in the late freezing-thawing period; ③the mass loss and elastic modulus decrease of fly ash concrete with the increase of W/B in the process of saline-alkali freeze-thaw cycle; ④the mass loss rate and the dynamic modulus change rate of fly ash concrete show an exponential decreasing trend with the increase of the fly ash content.
关键词:
盐碱环境;冻融循环;粉煤灰混凝土;质量损失;动弹性模量
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