超高韧性磷酸镁水泥基复合材料压缩力学性能研究

doi:10.11896/cldb.23090058

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Abstract Magnesium phosphate cement (MPC) is a new type of inorganic cementitious material with many advantages such as short setting time, high early strength and good bonding performance. However, MPC-based composite materials have brittle properties and low strain capacity. Engineered cementitious composites (ECC) is prepared by using high-performance fibers to improve the toughness of cement-based composites. Through fiber toughening technology, ultra-high toughness magnesium phosphate cement-based composites (UHTMC) with excellent properties of MPC and ECC can be prepared. Here, through the axial tensile test, it is confirmed that the UHTMC has excellent tensile performance, strain hardening and obvious multi-cracking behavior. The effects of fly ash (FA) (substitution amounts:0%, 15%, 30% and 45%) and curing ages (14 d and 28 d) on the mechanical properties of UHTMC under compression were analyzed by the axial compressive strength, ultimate compressive strain, compressive elastic modulus and Poisson's ratio of the specimens. The results show that the UHTMC specimens exhibit good compressive toughness. With the increase of FA substitution amount and curing age, the axial compressive strength and compressive elastic modulus also increase, but the ultimate compressive strain decreases, and the Poisson's ratio changes little. Through the axial compression stress-strain curve of UHTMC, the constitutive relation model of axial compression is proposed and established. Finally, the influence mechanism of FA substitution amount and curing age on the macroscopic mechanical properties of UHTMC under compression was analyzed at the micro level.

Key words： magnesium phosphate cement fly ash ultra-high toughness compression property constitutive relation

Published: 10 September 2024 Online: 2024-09-30

CLC number:

TU528

Fund:IWHR Research & Development Support Program (SM0145B042021), China Postdoctoral Science Foundation (2021M702954), Natural Science Foundation of Henan Province (222300420314), and National Natural Science Foundation of China (52178258).

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	Articles by authors
	FENG Hu
	MIN Zhishuang
	GUO Aofei
	ZHU Biyang
	CHEN Bing
	HUANG Hao

Cite this article:

FENG Hu,MIN Zhishuang,GUO Aofei, et al. Study on Mechanical Properties of Ultra-high Toughness Magnesium Phosphate Cement-based Composites Under Compression[J]. Materials Reports, 2024, 38(17): 23090058-12.

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http://www.mater-rep.com/EN/10.11896/cldb.23090058 OR http://www.mater-rep.com/EN/Y2024/V38/I17/23090058

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