温度对水性聚氨酯-混凝土宏微观粘结特性的影响

doi:10.11896/cldb.22060045

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Abstract In order to understand the influence of ambient temperature on the macro- and micro-bonding characteristics of the interfacial between waterborne polyurethane (WPU) and concrete, the change of the mass loss, tensile strength and elongation at break of WPU at 20 ℃, 35 ℃ and 50 ℃ with age were tested. The influence of temperature on the bonding strength and failure mode between WPU and concrete was studied, and the micro-morphology and thickness of interfacial zone were analyzed by SEM and EDS. The results show that the mass loss of WPU increases with the increase of temperature, which indicates that film-forming speed become faster. Increasing the temperature can improve the early tensile strength of WPU, but the later tensile strength of WPU at higher temperature (50 ℃) decreases. With the increase of temperature and age, the interfacial bonding strength gradually increases, and the failure mode changes from single interface to composite failure mode. Microscopically, the increase of temperature makes the content of polyurethane hard segment in the interfacial zone gather, and the thickness of the interfacial zone increases from 44.21 μm to 65.08 μm, which leads to the increase of bonding strength.

Key words： waterborne polyurethane concrete temperature bonding characteristic microstructure

Published: 25 February 2024 Online: 2024-03-01

CLC number:

TU577

Fund:National Key R & D Program of China(2020YFC1511902), and National Natural Science Foundation of China (51739008).

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	Articles by authors
	TANG Jianhui
	BAI Yin
	CHEN Xudong
	ZHANG Wei

Cite this article:

TANG Jianhui,BAI Yin,CHEN Xudong, et al. Effect of Temperature on Macro- and Micro-Bonding Characteristics Between Waterborne Polyurethane and Concrete[J]. Materials Reports, 2024, 38(4): 22060045-6.

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http://www.mater-rep.com/EN/10.11896/cldb.22060045 OR http://www.mater-rep.com/EN/Y2024/V38/I4/22060045

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