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中南大学学报(英文版)

Journal of Central South University

Vol. 28    No. 6    June 2021

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Hydration phase and pore structure evolution of hardened cement paste at elevated temperature
XIANG Yu(向宇)1, XIE You-jun(谢友均)1, LONG Guang-cheng(龙广成)1, HE Fu-qiang(何富强)2, 3

1. School of Civil Engineering, Central South University, Changsha 410075, China;
2. School of Civil Engineering and Architecture, Xiamen University of Technology, Xiamen 361024, China;
3. Key Laboratory of Green Building Materials (Xiamen University of Technology),
Fujian Province University, Xiamen 361024, China

Abstract:To understand the effect of steam curing temperature on the hydrate and microstructure of hardened cement paste, several measuring methods including X-ray diffraction (XRD), atomic absorption spectroscopy (ASS), ion chromatography, conductivity meter, alternating-current impedance spectroscopy and nuclear magnetic resonance (NMR) are employed to investigate the hydration characteristics, pore solution composition and conductivity, resistivity and pore structure during the steam curing process. Experimental results show that steam curing promotes the hydration process, greatly raises the resistivity, and decreases the porosity of specimen at early age. Compared with being treated at 45 °C, higher temperature leads to a fast decomposition of ettringite at initial stage of the constant temperature treatment period, which improves the relative content and ionic activity of the conductive ions in pore solution. Furthermore, the number of pores larger than 200 nm increases significantly, which reduces the resistivity of the hardened cement paste. Cement paste treated at 45 °C has a more stable and denser microstructure with less damages.

 

Key words: cement paste; high-temperature curing; pore structure; AC impedance; nuclear magnetic resonance

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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