Effect of Sulfate Erosion on Multiple Interface Microstructure of Recycled Concrete

DOI

10.2991/iccte-17.2017.87How to use a DOI?

Keywords

recycled concrete, multiple interface, microhardness, sulfate attack, age

Abstract

By studying the microhardness of different interfaces of sulphate-eroded recycled concrete, the width of the transition zone of different interface from different strength grades was determined. And the influence of sulfate age on the microstructure of regenerated concrete was studied, which reveal the mechanism of deterioration of sulfate erosion in multiple interfaces of recycled concrete. The results show that the microhardness of old aggregate - new slurry interface (LG-XJ interface), old slurry - new slurry interface (LJ-XJ interface) and old aggregate - old slurry interface (LG-LJ interface) with the same strength reclaimed concrete increases firstly and then decreases as the growth of the age of the sulfate, and also the width of the interface transition zone reduces first and then increases. When the erosion age is 60d, the change of the interfacial transition zone of the LJ-XJ interface that is with high strength grade recycled concrete is still not obvious. And when the erosion age are 90d, the width of the interface transition zone increases. The strength of the three kinds of interface resistance to sulfate attack of recycled concrete with the same strength grade: the LG-XJ interface is the weakest, and the LG-LJ interface is the second, then the LJ-XJ interface is the strongest. With the development of the strength grade of recycled concrete, the microhardness of the same interface heightens and the width of the interface transition zone reduces, what's more, the ability of the interface to resist sulfate attack is enhanced.

Copyright

© 2017, the Authors. Published by Atlantis Press.

Open Access

This is an open access article distributed under the CC BY-NC license (http://creativecommons.org/licenses/by-nc/4.0/).

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TY  - CONF
AU  - Qianqian Li
AU  - Qiuyi Li
AU  - Yuanxin Guo
PY  - 2017/07
DA  - 2017/07
TI  - Effect of Sulfate Erosion on Multiple Interface Microstructure of Recycled Concrete
BT  - Proceedings of the 2017 2nd International Conference on Civil, Transportation and Environmental Engineering (ICCTE 2017)
PB  - Atlantis Press
SP  - 493
EP  - 500
SN  - 2352-5401
UR  - https://doi.org/10.2991/iccte-17.2017.87
DO  - 10.2991/iccte-17.2017.87
ID  - Li2017/07
ER  -