摘要
为了研究混掺纤维橡胶混凝土在硫酸盐干湿循环环境下的抗冻性,以玄武岩与聚丙烯纤维掺量、冻融干湿循环周期为试验参数,将六种不同纤维掺量的混掺纤维橡胶混凝土试件放入5%硫酸钠溶液中干湿循环后再进行抗冻性研究,从外观形貌变化、立方体抗压强度变化、质量损失、相对动弹性模量以及混凝土损伤角度分析了混掺纤维橡胶混凝土的抗冻性随纤维掺量、冻融干湿循环周期的变化规律。结果表明:随着冻融干湿循环周期延长,混掺纤维橡胶混凝土的质量损失逐渐增加,相对动弹性模量逐渐降低;纤维掺量过大时,纤维对混凝土的抗冻性起到“负效应”;纤维和橡胶粉的加入会提高混凝土的密实性,从而阻断部分侵蚀产物产生。当混凝土损伤度相同时,冻融-干湿循环损伤速率更快,是单一冻融循环的1.17倍,采用相对动弹性模量来评价混凝土损失程度切实可行。
In order to analyze the frost resistance of the mixed fiber rubber concrete in the sulfate dry-wet cycle environment,the content of basalt and polypropylene fibers and the freeze-thaw dry-wet cycle period were used as test parameters.The six mixed fiber rubber concrete specimen were placed in 5%sodium sulfate solution for drying and wetting cycles,and then the frost resistance was analyzed.From the perspectives of appearance change,cubic compressive strength change,mass loss,relative dynamic elastic modulus and concrete damage,the variation law of frost resistance of the mixed fiber rubber concrete with fiber content and freeze-thaw-dry-wet cycle period was also analyzed.The results are as follows.With the extension of freeze-thaw-dry-wet cycle period,the mass loss of the mixed fiber rubber concrete increases gradually,and the relative dynamic elastic modulus decreases gradually;when the fiber content is too large,the fiber plays a negative role in the frost resistance of concrete;the addition of rubber powder and fiber will increase the compactness of the concrete,thereby blocking the production of some erosion products.When the damage degree of concrete is the same,the damage rate of freeze-thaw-dry-wet cycle is faster,which is 1.17 times that of a single freeze-thaw cycle.It is practical to use relative dynamic elastic modulus to evaluate the degree of concrete loss.
作者
孙杰
吴爽
马稳
孙明星
冯川
张尧
SUN Jie;WU Shuang;MA Wen;SUN Mingxing;FENG Chuan;ZHANG Yao(School of Urban Construction,Wuhan University of Science and Technology,Wuhan,Hubei 430065,China;Hubei Communications Investment Production City Suizhou Development Co.,Ltd.,Suizhou,Hubei 441300,China)
出处
《水利与建筑工程学报》
2022年第3期21-27,153,共8页
Journal of Water Resources and Architectural Engineering
基金
湖北省建设科技计划项目(202144)。
