Pore structure structure and chloride diffusivity of recycled aggregate concrete with nano-SiO2 and nano-TiO2

被引：151
|
作者：
Ying, Jingwei [1 ,2 ,3 ]
Zhou, Bin [1 ]
Xiao, Jianzhuang [1 ,4 ]
机构：
[1] Guangxi Univ, Coll Civil Engn & Architecture, Nanning 530004, Peoples R China
[2] Guangxi Univ, Minist Educ, Guangxi Key Lab Disaster Prevent & Engn Safety, Nanning 530004, Peoples R China
[3] Guangxi Univ, Minist Educ, Key Lab Disaster Prevent & Struct Safety, Nanning 530004, Peoples R China
[4] Tongji Univ, Dept Struct Engn, Shanghai 200092, Peoples R China
来源：
CONSTRUCTION AND BUILDING MATERIALS | 2017年 / 150卷
基金：
中国国家自然科学基金; 中国博士后科学基金;
关键词：
Recycled aggregate concrete; Nanoparticles; Pore structure; Chloride diffusivity; Mechanical behavior; MERCURY INTRUSION POROSIMETRY; NANO-SILICA; MICROSTRUCTURE;
D O I：
10.1016/j.conbuildmat.2017.05.168
中图分类号：
TU [建筑科学];
学科分类号：
0813 ;
摘要：
Nano-SiO2 and nano-TiO2 particles were mixed into recycled aggregate concrete (RAC) to enhance its properties. Mercury intrusion porosimetry was used to test the pore structure of the mortar in RAC, and the rapid chloride migration instrument was selected to investigate the diffusivity of RAC. It is found that the,addition of nanoparticle refines the pore structure of RAC and enhances the resistance to chloride diffusivity of RAC. Furthermore, a three-phase composite sphere model for the matrix in RAC was proposed by considering the new mortar, old attached mortar and original aggregate as continuous phases. The three-phase model considering the microstructure of RAC was verified by experiment results, which can be applied to predict the chloride diffusivity of RAC with nanoparticles. (C) 2017 Elsevier Ltd. All rights reserved.
引用
收藏
页码：49 / 55
页数：7
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