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- Title
Application of Metakaolin in Artificial Hydraulic Lime Repair Mortar.
- Authors
GU Lilong; SHANG Huaishuai; WU Yayue; MENG Weiguang; HOU Guanhao
- Abstract
In order to prepare a green inorganic restoration material that is suitable for the restoration of historical buildings, based on the XRD test results of the bonding materials of several historical brick masonry buildings in Qingdao, an artificial hydraulic lime repair mortar was prepared by mixing metakaolin. The influence of metakaolin on the artificial hydraulic lime mortar was studied by testing the fluidity, setting time, mass loss rate, dring shrinkage rate and mechanical properties. The results show that metakaolin can reduce the fluidity, shorten the setting time, reduce the dring shrinkage rate and improve the compressive strength and bonding strength of artificial hydraulic lime mortar. When the content is 5.0% and 7.5% (mass fraction), the 56 d compressive strength of artificial hydraulic lime mortar increases by 66. 8% and 94.3%, and the bond strength increases by 22.2% and 25.9%. Finally, XRD and SEM were used to test and analyze the microstructure of the materials. The results show that the main reason for the improvement of the performance of the artificial hydraulic lime mortar by metakaolin is that the active SiO2 and Al2 O3 in metakaolin react directly with the lime, and consume Ca(OH)2, which promotes the hydration of cement and enhances the bonding force between the hydrated products and the aggregate.
- Subjects
QINGDAO (China); LIME (Minerals); MECHANICAL drawing; MORTAR; BOND strengths; HISTORIC buildings; PRESERVATION of architecture
- Publication
Bulletin of the Chinese Ceramic Society, 2023, Vol 42, Issue 12, p4351
- ISSN
1001-1625
- Publication type
Article