粉煤灰和表面防护剂对混凝土抗氯离子渗透性能的影响  

Effect of fly ash and surface protectant on the anti-chloride ion penetration performance of concrete

作　　者：郭自利[1] 康迎杰 祝小靓 张明 GUO Zili;KANG Yingjie;ZHU Xiaoliang;ZHANG Ming(Department of Civil Engineering,Tsinghua University,Beijing 100084,China;State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures,Shijiazhuang Tiedao University,Shijiazhuang 050043,China;China Western Construction Academy of Building Materials Co.,Ltd.,Chengdu 610221,China)

机构地区：[1]清华大学土木工程系,北京100084 [2]石家庄铁道大学省部共建交通工程结构力学行为与系统安全国家重点实验室,河北石家庄050043 [3]中建西部建设建材科学研究院有限公司,四川成都610221

出　　处：《混凝土》2024年第7期1-3,10,共4页Concrete

基　　金：国家重点研发计划(2019YFC1907204);四川省科技厅应用技术研究自由探索型项目(2021YJ0530);江西省水利厅重大科技项目(202124ZDKT28)。

摘　　要：提升混凝土耐久性能的关键在于提高其抗渗性能,涂抹表面防护材料和掺加粉煤灰是两种常用的技术手段,为研究两种技术对混凝土抗氯离子渗透性能的协同提升效果,设计了不同掺量粉煤灰混凝土,对部分试件进行了无机表面防护材料喷涂,研究其对立方体抗压强度和抗氯离子渗透性的影响。试验结果表明:混凝土的抗压强度受粉煤灰掺量的显著影响,而受表面防护剂的影响不大;涂抹防护剂对无掺加粉煤灰或掺加少量(9.5%)粉煤灰混凝土的抗氯离子渗透性能提升效果更为明显;对掺量较大(19%)的粉煤灰混凝土,测试其抗氯离子渗透性能时,建议以长龄期的结果为主为宜。The key to improve the durability performance of concrete is to improve its impermeability.Applying surface protectant and adding fly ash are two common technical solutions.In order to study the synergistic effect of the two solutions on the anti-chloride ion penetration performance of concrete,different amounts of fly ash concrete were designed.Some of the specimens were coated with surface protectant.The cubic compressive strength tests and chloride ion permeability resistance test were conducted.The test results show that the compressive strength of concrete is significantly affected by the amount of fly ash admixture,but not much by the surface protectant.The surface protectant has a more obvious effect on the improvement of chloride ion permeation resistance of concrete without or with a small amount(9.5%)of fly ash;For the fly ash concrete with a larger admixture(19%),it is recommended to test its chloride ion permeation resistance with the results of long age is appropriate.

关 键 词：抗氯离子渗透性能 粉煤灰 表面防护剂 耐久性 

分 类 号：TU528.01[建筑科学—建筑技术科学]