Effect of nano-strengthening on the properties and microstructure of recycled concrete

Nanotechnology Reviews

article

Tao Meng¹  Jiaolong Zhang¹  Huadong Wei¹  Jiajia Shen¹ 

[1] College of Civil Engineering and Architecture, Zhejiang University;College of civil engineering, Tongji University;Bristol Composite Institute (ACCIS), University of Bristol, United Kingdom of Great Britain and Northern Ireland

关键词: nano-strengthening;    mechanical properties;    recycled concrete;    recycled aggregate;    interfacial transition zones;   

DOI  :  10.1515/ntrev-2020-0008

学科分类：社会科学、人文和艺术（综合）

来源: De Gruyter

【 摘 要 】

Influence of nano-strengthening immersion on the properties of recycled aggregate (RA) and recycled aggregate concrete (RAC) and the microstructure of interfacial transition zones (ITZs) between mortar and aggregate were studied in this paper. Results showed that nano-strengthening immersion was helpful to reduce the crushing value and total pore area of RA, to significantly improve the mechanical strength of RAC, and to modify the bond strength between RAC and steel rebar and the structural properties of RAC beams. Mercury intrusion porosimetry (MIP), micro-hardness (MH) and scanning electron microscope (SEM) observation were conducted in order to reveal the enhancement mechanism of nano-strengthening immersion. Results showed that the density and mechanical properties in ITZs were obviously improved by nano-strengthening because the coating and penetration of nano-materials was helpful to block the pores and cracks in ITZs, to avoid the directed gathering of CH crystal, and to accelerate the hydration of cement and mineral additions.

【 授权许可】

CC BY