摘要
为研究外掺石灰石粉对水泥基材料抗碳硫硅钙石侵蚀性能的影响,本文采用电场加速侵蚀技术,对不同石灰石粉掺量水泥净浆试件进行低温硫酸盐侵蚀试验,并利用形貌变化、XRD及FTIR测试等手段分析其侵蚀过程。结果表明:外掺石灰石粉掺量越大,水泥基材料发生硫酸盐侵蚀的时间越早、侵蚀进程越快且侵蚀等级越高;外掺石灰石粉掺量不大于15%时,低温硫酸盐侵蚀条件下水泥基材料的侵蚀类型以钙矾石型与石膏型为主;当掺量不小于20%时,将同时发生钙矾石型、石膏型及碳硫硅钙石型硫酸盐侵蚀;为避免水泥基材料在低温硫酸盐侵蚀环境下发生TSA侵蚀,建议外掺石灰石粉量控制在5%以内为宜。
The effect of exogenous limestone powder on the resistance of cement-based materials to thaumasite sulfate attack is investigated.An electric field is used to accelerate sulfate attack,and low-temperature sulfate attack test is performed on cement paste test samples with different limestone powder contents.The corrosion process is analyzed based on appearance damage,XRD and FTIR.Results show that with increasing amount of exogenous limestone powder,the earlier sulfate attack occurs in cement-based materials,the greater the degree of corrosion and the faster the rate.When the amount of limestone powder is 15%or lower,the corrosion forms of cement-based materials subjected to low-temperature sulfate attack are mainly ettringite and gypsum forms.When the amount is 20%or higher,ettringite,gypsum,and thaumasite forms were found simultaneously after sulfate attack.In order to avoid thaumasite attack on cement-based materials under low temperature sulfate erosion environment.It is suggested that the amount of exogenous limestone powder should be controlled within 5%.
作者
杨鹏宇
李雪峰
苏跃宏
张开顺
YANG Pengyu;LI Xuefeng;SU Yuehong;ZHANG Kaishun(Research Institute of Highway Ministry Transport,Beijing 100088,China;School of Civil Engineering,Inner Mongolia University of Technology,Hohhot 010051,China;National Engineering Laboratory for Bridge Structure Safety Technology,Beijing 100088,China;The 5th Engineering Ltd of the 11th Engineering Bureau of China Railway,Chongqing 400037,China)
出处
《土木工程与管理学报》
2021年第3期173-179,共7页
Journal of Civil Engineering and Management
基金
中央级公益性科研院所基本科研业务费(2021-9047a)
山西省交通科技项目(2017-1-6)。
关键词
外源性
石灰石粉
水泥基材料
碳硫硅钙石
电场
exogenous
limestone powder
cement-based material
thaumasite
electrical field
