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Materials 2016, 9(9), 733; doi:10.3390/ma9090733

SEM Analysis of the Interfacial Transition Zone between Cement-Glass Powder Paste and Aggregate of Mortar under Microwave Curing

1
School of Materials Science and Engineering, Tongji University, Shanghai 201804, China
2
State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, Wuhan 430072, China
3
College of Civil Engineering and Architecture, Zhejiang University, Hangzhou 310000, China
*
Author to whom correspondence should be addressed.
Academic Editor: Jorge de Brito
Received: 17 June 2016 / Revised: 15 August 2016 / Accepted: 22 August 2016 / Published: 27 August 2016
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Abstract

In order to investigate the effects of microwave curing on the microstructure of the interfacial transition zone of mortar prepared with a composite binder containing glass powder and to explain the mechanism of microwave curing on the improvement of compressive strength, in this study, the compressive strength of mortar under microwave curing was compared against mortar cured using (a) normal curing at 20 ± 1 °C with relative humidity (RH) > 90%; (b) steam curing at 40 °C for 10 h; and (c) steam curing at 80 °C for 4 h. The microstructure of the interfacial transition zone of mortar under the four curing regimes was analyzed by Scanning electron microscopy (SEM). The results showed that the improvement of the compressive strength of mortar under microwave curing can be attributed to the amelioration of the microstructure of the interfacial transition zone. The hydration degree of cement is accelerated by the thermal effect of microwave curing and Na+ partially dissolved from the fine glass powder to form more reticular calcium silicate hydrate, which connects the aggregate, calcium hydroxide, and non-hydrated cement and glass powder into a denser integral structure. In addition, a more stable triangular structure of calcium hydroxide contributes to the improvement of compressive strength. View Full-Text
Keywords: SEM; microstructure; ITZ; microwave curing; glass powder SEM; microstructure; ITZ; microwave curing; glass powder
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Kong, Y.; Wang, P.; Liu, S.; Zhao, G.; Peng, Y. SEM Analysis of the Interfacial Transition Zone between Cement-Glass Powder Paste and Aggregate of Mortar under Microwave Curing. Materials 2016, 9, 733.

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