Effects of slag powder/metakaolin on the early performance of natural hydraulic lime

Xu Dong; Zhang Dajiang; Wang Dongming; Qi Guodong; Zhang Shuai

doi:10.19606/j.cnki.jmst.2022.05.014

Volume 7 Issue 5

Oct. 2022

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Xu Dong, Zhang Dajiang, Wang Dongming, Qi Guodong, Zhang Shuai. Effects of slag powder/metakaolin on the early performance of natural hydraulic lime[J]. Journal of Mining Science and Technology, 2022, 7(5): 632-642. doi: 10.19606/j.cnki.jmst.2022.05.014

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Effects of slag powder/metakaolin on the early performance of natural hydraulic lime

doi: 10.19606/j.cnki.jmst.2022.05.014

1.
School of Chemical and Environmental Engineering, China University of Mining and Technology-Beijing, Beijing 100083, China
2.
Faculty of Materials and Manufacturing, Beijing University of Technology, Beijing 100124, China

Received Date: 2022-05-29
Rev Recd Date: 2022-06-26
Publish Date: 2022-10-31

Abstract

Abstract

Natural Hydraulic Lime (NHL) has exceptional application in restoring ancient buildings compared to Portland cement and conventional air-hardening lime, but the characteristic of slow early performance development limits its fields of application. This paper studied the physical and mechanical properties, hydration exothermic properties, phase composition and transformation, and microstructure evolution of slag powder/metakaolin composite NHL during the early hardening process. The influence of slag powder/metakaolin on the hardening process and performance development of NHL are systematically evaluated. Results show that slag powder can improve the fluidity of NHL-based mortar; slag powder/metakaolin generates calcium aluminate hydrate (C₃AH₆), calcium carboaluminate hydrate (C₄AĈH₁₁) and calcium silicate hydrate (C—S—H) through pozzolanic reaction to promote the setting and hardening of NHL-based materials and significantly improve their compressive and flexural strength. This study provides reference for promoting the application of pozzolanic material composite NHL in the restoration of ancient buildings.
- natural hydraulic lime,
- slag powder,
- metakaolin,
- pozzolanic reaction,
- early performance

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References

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Effects of slag powder/metakaolin on the early performance of natural hydraulic lime

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