Influence of Curing Temperature on the Deformation properties of Magnesium Oxide Micro-expansive Concrete

DOI

10.2991/iccte-16.2016.91How to use a DOI?

Keywords

Curing temperature,magnesium oxide,free expansion rate,hydration rate,migration rat

Abstract

The influence of curing temperature on the deformation properties of magnesium oxide(MgO) micro-expansive concrete were studied.Hydration mechanism and expansion characteristics of magnesium oxide(MgO) in cement paste were analyzed by XRD DSC-TG and SEM. Results indicated.Curing temperature had a great effect on free expansion ratio of MgO mortar, the higher the curing temperature, the bigger the early expansion, the sooner the inflation curves to stabilize.The rising of curing temperature accelerated the hydration rate of MgO and the formation of Mg(OH)2 crystals, because the increased temperature accelerated migration rate of Mg2+and OH-after the MgO hydrating ,and made the formation of Mg(OH)2 crystal to be accelerated accordingly and expansion effect in advance.With the risng of curing temperature, there were some changes in microstructure of Mg(OH)2,which the short lamellar crystals turned into fibrous.

Copyright

© 2016, 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  - Yun Dong
AU  - Jianfeng Zhang
AU  - Xia Chen
AU  - Huaquan Yang
PY  - 2016/01
DA  - 2016/01
TI  - Influence of Curing Temperature on the Deformation properties of Magnesium Oxide Micro-expansive Concrete
BT  - Proceedings of the 2016 International Conference on Civil, Transportation and Environment
PB  - Atlantis Press
SP  - 552
EP  - 558
SN  - 2352-5401
UR  - https://doi.org/10.2991/iccte-16.2016.91
DO  - 10.2991/iccte-16.2016.91
ID  - Dong2016/01
ER  -