大掺量矿物掺合料混凝土耐久性研究  

The Research on Durability of Concrete with Large Volume of Mineral Blends

作　　者：高伟[1] 马志才[1] 苏磊 田亮 GAO Wei;MA Zhicai;SU Lei;TIAN Liang(College of Road and Bridge,Beijing Vocational College of Transport,Beijing 101121)

机构地区：[1]北京交通运输职业学院道路桥梁学院,北京101121

出　　处：《济源职业技术学院学报》2023年第4期54-58,共5页Journal of Jiyuan Vocational and Technical College

基　　金：交通运输职业教育教学指导委员会路桥工程专业委员会教研课题(LQZWH202303)。

摘　　要：对9种不同掺量矿物掺合料条件下的不同配合比混凝土的耐久性能进行了研究。研究发现:随着矿物掺合料的掺入比例不断增加,由于混凝土内部孔结构和级配得到较为有效改善,混凝土的氯离子扩散系数不断减小,混凝土抵抗氯离子渗透能力逐渐增强,抗碳化能力不断降低,在混凝土的水胶比较大时效果明显。当水胶比为0.26,粉煤灰掺量为50%时,C70混凝土的氯离子扩散系数最小,达到0.403/(10-8 cm 2/s);粉煤灰掺量为40%时,C70混凝土的抗碳化性能最强,达到1.0 mm。The durability of concrete with different mixtures of 9 different mineral admixtures was studied.The results show that with the increase of the proportion of mineral admixture,the chloride ion diffusion coefficient of concrete decreases and the resistance to chloride ion penetration increases gradually due to the effective improvement of the pore structure and gradation of concrete.The carbonization resistance decreases continuously,and the effect is more obvious when the water-binder ratio of concrete is large than when the water-binder ratio is small.When the water-binder ratio is 0.26 and the fly ash content is 50%,the chloride diffusion coefficient of C70 concrete is the smallest,reaching 0.403(10-8 cm^(2)/s).When the content of fly ash is 40%,the carbonization resistance of C70 concrete reaches the strongest,reaching 1.0 mm.

关 键 词：矿物掺合料 耐久性 抗碳化性能 混凝土 

分 类 号：TU528.041[建筑科学—建筑技术科学]