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Journal of Thermal Analysis and Calorimetry

, Volume 139, Issue 2, pp 863–875 | Cite as

Temperature evolution during the compaction of calcium silicate hydrate powders using a compression calorimeter

  • Shuping WangEmail author
  • Xiaoqin Peng
  • Luping Tang
  • Lin Lin
  • Zhijun Dong
  • Lu Zeng
Article
  • 61 Downloads

Abstract

Amorphous calcium silicate hydrate (CSH) undergoes contact-hardening property, i.e. the powder can be hardened by compression. A compression calorimeter was designed to determine the temperature evolution during the compaction of the powder. A platinum sensor (Pt100) was used as the temperature sensor and was positioned in the powder as well as in the compression die. A resolution of 0.01 °C with a sampling time of every second was used to monitor the temperature. Both theoretical calculation and simulations by COMSOL multiphysics showed that the device reliably evaluated the temperature during the compaction of CSH powders. The measurement was taken under semi-adiabatic conditions. The temperature profiles obtained from the measurement revealed the compression process and bonding development during the compaction of the powders. Finally, a linear relationship was observed between the compressive strength and the maximum temperature increase. This provides insight into the contact-hardening mechanism during the compaction of CSH powders.

Keywords

Calcium silicate hydrate Powder compaction Compression calorimeter Semi-adiabatic measurement Temperature evolution 

Notes

Acknowledgements

This work was primarily supported by the Fundamental Research Funds for the Central Universities (Grant Number 2019CDJGFCL002) and the National Natural Science Foundation of China (Grant Numbers 50972171 and 51678093). The microscopy facilities were supported in part by the Large Equipment Fund of Chongqing University under Agreement KF201612150031. The authors also greatly appreciate the support of the China Scholarship Council.

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Copyright information

© Akadémiai Kiadó, Budapest, Hungary 2019

Authors and Affiliations

  1. 1.Department of Building Materials, College of Materials Science and EngineeringChongqing UniversityChongqingChina
  2. 2.Department of Architecture and Civil EngineeringChalmers University of TechnologyGothenburgSweden
  3. 3.Shenzhen Institute of Information TechnologyShenzhenChina

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