摘要
采用纳米增强骨料裹浆技术制备了纳米SiO2增强骨料裹浆混凝土,并测试了其浆体流变性、抗压强度、质量损失和动弹性模量.采用扫描电子显微镜(SEM)和压汞仪(MIP)研究了纳米SiO2增强骨料裹浆混凝土界面过渡区的微观结构和浆体孔结构.结果表明:纳米SiO2显著增加了浆体黏度,增强了骨料裹浆能力;纳米SiO2增强骨料裹浆混凝土的力学和抗冻性能得以提升,强度损失和质量损失均低于普通纳米改性混凝土;纳米SiO2增强骨料裹浆混凝土界面过渡区更加致密,有害孔比普通纳米改性混凝土减少了10.1%,无害孔增加了14.7%.
The nano-modified concrete was prepared based on coating aggregate with nano-SiO2 enhanced technology.The rheological properties of paste,the compressive strength,the mass loss and the relative dynamic modulus of concrete were tested.The microstructure of the interface transition zone and the pore structures were studied by scanning electron microscope(SEM)and mercury porosimeter(MIP).The results show that the viscosity of the paste is significantly increased and the coated aggregate with nano-SiO2 is strengthened.The mechanical and frost resistance of the concrete with aggregate coated by nano-SiO2 are enhanced,because the strength loss and the quality loss are lower than that of the ordinary nano-modified concrete.The interface transition zone becomes denser and the harmful pores are reduced by 10.1%while the harmless pores are increased by 14.7%,compared with the ordinary nano-modified concrete.
作者
高国华
黄卫东
李传海
GAO Guohua;HUANG Weidong;LI Chuanhai(Key Laboratory of Road and Traffic Engineering of the Ministry of Education, Tongji University, Shanghai 201804, China;Key Laboratory of Highway Technology and Safety Assessment of Shandong Province, Ji'nan 250002, China)
出处
《建筑材料学报》
EI
CAS
CSCD
北大核心
2021年第1期45-53,共9页
Journal of Building Materials
基金
国家自然科学基金资助项目(51778481)。
关键词
纳米增强
骨料裹浆
混凝土
力学性能
抗冻性能
界面过渡区
nano-enhancement
coated aggregate
concrete
mechanical property
frost resistance
interface transition zone
