摘要
目前,纳米材料因其优异的性能已经在水泥基材料中得到了广泛应用。利用两种类型的纳米颗粒,即纳米二氧化硅(NS)和纳米碳化硅(NC)掺入粉煤灰水泥砂浆制备水工混凝土试样,在强度测试的基础上,研究了纳米颗粒含量对不同试样耐冲磨性的影响,并对其作用机理进行理论分析。结果表明,纳米颗粒在提高粉煤灰混凝土抗压和抗弯强度得同时也改善了抗冲磨性能;单掺NS和NC最佳添加量分别为2%和为3%,而双掺2%NS和2%NC的水工混凝土具有最优抗冲磨性能,磨损量仅为0.64 kg/m2,比参照组的磨损量降低了75%;从SEM扫描图像中得到改性机理为纳米颗粒的表面效应、火山灰反应和微观骨料填充效应,增大了骨料得表面能,改变了界面过渡区的结构,同时也填充了微结构孔隙,从而提高了粉煤灰混凝土的耐冲磨性。研究结果对设计高强度和抗冲磨性的水工混凝土具有一定指导意义。
The nanomaterials have been widely used in cement-based materials because of the excellent properties.In this study,two types of nano-particles,nano-silica(NS)and nano-silicon carbide(NC),were used to prepare hydraulic concrete specimens.On the basis of strength tests,the effect of nano-particle content on the abrasion resistance of different specimens was studied,and the mechanism was analyzed theoretically.The results show that nano-particles can improve both the compressive and bending strength of fly ash concrete,so as the abrasion resistance of samples.The optimum addition of NS and NC is 2%and 3%,respectively,while that of hydraulic concrete with 2%NS and 2%NC is 0.64 kg/m2,which is 75%lower than that of the reference group.The surface effect of nano-particles,pozzolanic reaction and micro-aggregate filling effect were found in the SEM images.The surface energy of aggregate was increased,the structure of interface transition zone was changed,and the micro-structure pore was filled,so the abrasion resistance of fly ash concrete was improved.The research results have certain guiding significance for designing high strength and abrasion resistant hydraulic concrete.
作者
韩俊强
HAN Junqiang(The Engineering and Technical College,Chengdu University of Technology,Leshan 614007,China)
出处
《混凝土》
CAS
北大核心
2020年第3期97-100,共4页
Concrete
基金
国家自然科学基金项目(51308465)
四川省教育厅(17ZB0060)
成都理工大学工程技术学院(C122016026)。
