高温后混凝土毛细吸水特性的核磁共振分析及其力学性能研究

doi:10.11896/cldb.23070160

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Abstract To investigate the influence of high temperature on the mechanical properties and capillary water absorption characteristics of concrete, uniaxial compression tests and capillary water absorption tests were conducted on concrete specimens after exposure to high temperatures of 200, 400, 600, and 800 ℃. The pore structure and capillary water absorption process were studied using Nuclear Magnetic Resonance (NMR) technology. Experimental results indicate that the mass loss rate of concrete gradually increases with exposure to temperatures of 200, 400, 600, and 800 ℃, while the compressive strength increases first and then decreases. Based on the distribution characteristics of the NMR T₂ spectrum, concrete pores were classified into micropores, mesopores, capillary pores, and macropores. Analysis of the water absorption characteristics of concrete after exposure to high temperatures reveals that the water absorption height of concrete is generally exponentially related to the NMR signal intensity. When the NMR signal intensity rapidly increases, moisture enters the interior of the concrete specimen under capillary force. As the NMR signal continues to rise gradually over time but at a decreasing rate, the specimen maintains its water absorption state but with a gradually decreasing water absorption rate per unit time. When the NMR signal decreases and the rate of decrease slows down, the pores gradually are filled with moisture, and the concrete specimen tends to be saturation.

Key words： concrete high temperature nuclear magnetic resonance pore structure capillary water absorption

Published: 10 February 2025 Online: 2025-02-05

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TU528

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	Articles by authors
	TIAN Wei
	GUO Jian
	WANG Wenkui
	ZHANG Jingsheng
	WANG Kaixing

Cite this article:

TIAN Wei,GUO Jian,WANG Wenkui, et al. NMR Analysis of Capillary Water Absorption Characteristics and Mechanical Properties of Concrete After High-temperature[J]. Materials Reports, 2025, 39(3): 23070160-7.

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http://www.mater-rep.com/EN/10.11896/cldb.23070160 OR http://www.mater-rep.com/EN/Y2025/V39/I3/23070160

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