Mechanical strength and the degradation mechanism of metakaolin based geopolymer mixed with ordinary Portland cement and cured at high temperature and high relative humidity

Xia Miao; Xiaofan Pang; Shiyu Li; Haoguang Wei; Jianhao Yin; Xiangming Kong

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Mechanical strength and the degradation mechanism of metakaolin based geopolymer mixed with ordinary Portland cement and cured at high temperature and high relative humidity

Full Length Article | Updated：2026-01-06

- Mechanical strength and the degradation mechanism of metakaolin based geopolymer mixed with ordinary Portland cement and cured at high temperature and high relative humidity
- Mechanical strength and the degradation mechanism of metakaolin based geopolymer mixed with ordinary Portland cement and cured at high temperature and high relative humidity
- 中国化学工程学报（英文版） 2023年60卷第8期页码：118-130
- Affiliations：
  
  1. State Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Effective Development,Beijing,China,100101
  2. Sinopec Research Institute of Petroleum Engineering Co., Ltd,Beijing,China,100101
  3. Department of Civil Engineering, Tsinghua University,Beijing,China,100084
- Author bio：
- Funds：
- DOI：
  中图分类号：
- 纸质出版：2023
- Accepted：
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Xia Miao, Xiaofan Pang, Shiyu Li, 等. Mechanical strength and the degradation mechanism of metakaolin based geopolymer mixed with ordinary Portland cement and cured at high temperature and high relative humidity[J]. 中国化学工程学报（英文版）, 2023,60(8):118-130.

Xia Miao, Xiaofan Pang, Shiyu Li, Haoguang Wei, Jianhao Yin, Xiangming Kong. Mechanical strength and the degradation mechanism of metakaolin based geopolymer mixed with ordinary Portland cement and cured at high temperature and high relative humidity[J]. Chinese Journal of Chemical Engineering, 2023, 60(8): 118-130.
Xia Miao, Xiaofan Pang, Shiyu Li, 等. Mechanical strength and the degradation mechanism of metakaolin based geopolymer mixed with ordinary Portland cement and cured at high temperature and high relative humidity[J]. 中国化学工程学报（英文版）, 2023,60(8):118-130. DOI：

Xia Miao, Xiaofan Pang, Shiyu Li, Haoguang Wei, Jianhao Yin, Xiangming Kong. Mechanical strength and the degradation mechanism of metakaolin based geopolymer mixed with ordinary Portland cement and cured at high temperature and high relative humidity[J]. Chinese Journal of Chemical Engineering, 2023, 60(8): 118-130. DOI：

摘要

Abstract

Geopolymer is a new type of eco-friendly cementitious material

and its superior drying and high temperature resistance has been widely recognized. The service performance of geopolymer under 150 ℃ high-temperature hydrothermal conditions is still less discussed. In this paper

the mechanical strength of pure metakaolin system with low calcium content and metakaolin-cement system with high calcium content under hydrothermal and non-hydrothermal conditions were studied. The results show that under 150 ℃ hydrothermal conditions

the strength of pure metakaolin geopolymer sharply decreases by reduction rate of 81.8% compared to the sample under 150 ℃ drying conditions

while the strength of metakaolin-cement geopolymers is well retained with only a slight decrease of 14.4%. This is mainly because the predominantly hydration product sodium aluminosilicate (N-A-S-H) gel of pure metakaolin system undergoes the process of “dissociation-repolymerization-crystallization” under 150 ℃ hydrothermal conditions

resulting in the loss of cementation ability and obvious deterioration of mechanical strength. In the metakaolin-cement system

the high-calcium calcium silicate gel (C-A-S-H) gel maintains a stable structure

thereby maintaining the macroscopic strength of the material under the hydrothermal conditions.

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