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Article

Contact-Hardening Behavior of Calcium Silicate Hydrate Powders

1
College of Materials Science and Engineering, Chongqing University, Chongqing 400045, China
2
Department of Architecture and Civil Engineering, Chalmers University of Technology, 412 96 Gothenburg, Sweden
3
Yunnan Institute of Building Research, Kunming 650223, Yunnan, China
*
Author to whom correspondence should be addressed.
Materials 2018, 11(12), 2367; https://doi.org/10.3390/ma11122367
Received: 13 September 2018 / Revised: 17 November 2018 / Accepted: 21 November 2018 / Published: 25 November 2018
Calcium silicate hydrate (C-S-H) synthesized by a hydrothermal process from lime and siliceous materials was oven-dried and compressed into compacts. The microstructure and compaction properties of the resulting powders were characterized. The results show that the powders containing an amorphous structure become hardened compacts immediately after compression. Compacts with high strength but a relatively lower bulk density were produced. Amorphous C-S-H plays a key role in the bonding formation during powder compaction. According to the Heckel plots, particle rearrangement and plastic deformation were involved in the compaction of C-S-H powders. Point contact between C-S-H particles due to particle rearrangement dominates at a low compression pressure (i.e., <20 MPa). Van der Waals forces and hydrogen bonding are the main bonding types. Plastic deformation occurs at a higher compression pressure (i.e., >60 MPa), which results in surface contact. Consequently, a solid bridge forms, and the strength of compacts increases rapidly. These findings provide novel insight into the utilization of materials containing amorphous calcium silicate hydrate. View Full-Text
Keywords: calcium silicate hydrate; compression; compacts; point contact; interparticulate bonding calcium silicate hydrate; compression; compacts; point contact; interparticulate bonding
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MDPI and ACS Style

Wang, S.; Peng, X.; Tang, L.; Cao, C.; Zeng, L. Contact-Hardening Behavior of Calcium Silicate Hydrate Powders. Materials 2018, 11, 2367. https://doi.org/10.3390/ma11122367

AMA Style

Wang S, Peng X, Tang L, Cao C, Zeng L. Contact-Hardening Behavior of Calcium Silicate Hydrate Powders. Materials. 2018; 11(12):2367. https://doi.org/10.3390/ma11122367

Chicago/Turabian Style

Wang, Shuping, Xiaoqin Peng, Luping Tang, Chunpeng Cao, and Lu Zeng. 2018. "Contact-Hardening Behavior of Calcium Silicate Hydrate Powders" Materials 11, no. 12: 2367. https://doi.org/10.3390/ma11122367

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