Study on improving interface bonding performance of magnesium potassium phosphate cement mortar

J. Zhang; Y. Ji; Z.  Xu; Q. Xue; Y. Zhou; C. Jin

doi:10.3989/mc.2021.00421

Authors

J. Zhang Jiangsu Key Laboratory Environmental Impact and Structural Safety in Engineering, China University of Mining and Technology, (Xuzhou, Jiangsu, China) / School of Architecture Engineering, Xuzhou College of Industrial Technology, (Xuzhou, Jiangsu, China) https://orcid.org/0000-0003-2618-6563
Y. Ji Jiangsu Key Laboratory Environmental Impact and Structural Safety in Engineering, China University of Mining and Technology, (Xuzhou, Jiangsu, China) / State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology, (Xuzhou, Jiangsu, China) https://orcid.org/0000-0002-7414-9719
Z. Xu Jiangsu Key Laboratory Environmental Impact and Structural Safety in Engineering, China University of Mining and Technology, (Xuzhou, Jiangsu, China) / State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology, (Xuzhou, Jiangsu, China) https://orcid.org/0000-0001-7217-4614
Q. Xue Jiangsu Key Laboratory Environmental Impact and Structural Safety in Engineering, China University of Mining and Technology, (Xuzhou, Jiangsu, China) / State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology, (Xuzhou, Jiangsu, China) / Jiangsu Collaborative Innovation Center for Building Energy Saving and Construct Technology, (Xuzhou, Jiangsu, China) https://orcid.org/0000-0003-0939-5515
Y. Zhou Jiangsu Key Laboratory Environmental Impact and Structural Safety in Engineering, China University of Mining and Technology, (Xuzhou, Jiangsu, China) / State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology, (Xuzhou, Jiangsu, China) https://orcid.org/0000-0003-3056-6905
C. Jin Jiangsu Key Laboratory Environmental Impact and Structural Safety in Engineering, China University of Mining and Technology, (Xuzhou, Jiangsu, China) https://orcid.org/0000-0003-1655-3892

DOI:

https://doi.org/10.3989/mc.2021.00421

Keywords:

Blended cement, Adherence, Flexural strength, Interstitial zone, Mortar

Abstract

To enhance the interfacial bonding performance between magnesium potassium phosphate cement (MKPC) repair mortar and matrix concrete, in this study, MKPC modified mortar was used as the repair material to splice long prismatic test pieces. The four-point bending test was used to determine the flexural bearing capacity of the long prism, and the influence of changing the interface conditions and the modifying the MKPC repair mortar on the improvement of the basic performance of the splicing component is investigated.The research results show that, when the matrix concrete section is in a natural state, applying silica-fume modified MKPC interface agents on the interface with a repair thickness of 3 cm can improve the interface bonding performance. Furthermore, the working performance and mechanical properties of the MKPC repair mortar modified using nickel-iron slag and steel fibers have been significantly improved.

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