侵蚀环境耦合作用下衬砌混凝土的制备与耐久性能研究  

Study on the preparation and durability of lining concrete under the coupling action of erosion environment

作　　者：武春燕 杨晶[2] WU Chunyan;YANG Jing(Shanxi Vocational University of Engineering and Technology,Jinzhong 030619,China;Shanxi University,Taiyuan 030006,China)

机构地区：[1]山西工程科技职业大学,山西晋中030619 [2]山西大学,山西太原030006

出　　处：《混凝土》2024年第11期34-37,共4页Concrete

基　　金：山西省应用基础研究计划项目(201701D121068)。

摘　　要：探讨了自然侵蚀、冻融-硫酸盐侵蚀、干湿-硫酸盐侵蚀以及冻融-干-湿-硫酸盐侵蚀等对粉煤灰混凝土质量损耗影响。并分析侵蚀环境耦合作用下衬砌混凝土的侵蚀作用机理。结果表明:粉煤灰掺量为0和20%时,粉煤灰混凝土在冻融循环中的质量损失率随冻融循环次数的增大而增大,而20%的粉煤灰在冻融循环中的质量损失率则相对低。4种侵蚀环境耦合作用下,随着侵蚀时间的延长,衬砌粉煤灰混凝土的质量先增后减;不同侵蚀环境中,冻融-干湿-硫酸盐侵蚀对衬砌粉煤灰混凝土质量损失最为严重,其次为干湿-硫酸盐侵蚀,而硫酸盐侵蚀对质量损失的影响最小。粉煤灰的掺入会提高混凝土致密度以及降低硫酸根离子迁移速度等,复杂环境耦合作用下形成的侵蚀产物会相对较少,能提高衬砌粉煤灰混凝土抵抗硫酸盐侵蚀效果。Discusses the influence of natural erosion,freeze-thaw-sulfate erosion,dry-wet-sulfate erosion and freeze-thaw-dry-wet-sulfate erosion on the loss of fly ash concrete.The erosion mechanism of lining concrete under the coupling action of erosion environment is analyzed.The results show that when the content of fly ash is 0 and 20%,the mass loss rate of fly ash concrete in the freeze-thaw cycle increases with the number of freeze-thaw cycles,while the mass loss rate of 20%fly ash in the freeze-thaw cycle is relatively low.Under the coupling action of four kinds of erosion environments,with the extension of erosion time,the quality of lining fly ash concrete increases first and then decreases.In different erosion environments,freeze-thaw-dry-wet-sulfate erosion has the most serious impact on the quality loss of lining fly ash concrete,followed by dry-wet-sulfate erosion,and sulfate erosion has the least impact on the quality loss.The addition of fly ash will increase the density of concrete and reduce the migration rate of sulfate ions,etc.The corrosion products formed under the coupling of complex environment will be relatively small,which can improve the sulfate corrosion resistance of lining fly ash concrete.

关 键 词：粉煤灰 混凝土 侵蚀时间 干湿循环次数 冻融循环 

分 类 号：TU528.01[建筑科学—建筑技术科学]