长龄期机制砂再生骨料混凝土的断裂参数和断裂过程区

doi:10.11896/cldb.23040205

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Abstract To study the effect of age on the fracture mechanism of manufactured-sand recycled aggregate concrete (MSRAC), the fracture parameters and fracture process zone (FPZ) of MSRAC at 28 d and 300 d were studied using digital image correlation technique, and the fracture behavior and toughening mechanism of MSRAC were compared and analyzed. The results indicate that the nominal stiffness, fracture energy, initial fracture toughness and unstable fracture toughness of MSRAC are significantly improved with increasing age, the interaction between local micro-crack and macro-crack also increase significantly. However, the failure characteristics of long-age MSRAC are more rapid and violent, its brittleness increases significantly during the softening stage. In addition, the FPZ width and area of the MSRAC increase with age during unstable crack propagation, while the FPZ length is opposite. When the FPZ is fully developed, the FPZ length of MSRAC decreases with age and the FPZ width increases with age, while the FPZ area is insensitive to age. Compared with the 28 d MSRAC, the long-aged MSRAC has a stronger aggregate interlocking effect, and its secondary crack and damage range are also more obvious.

Key words： recycled aggregate concrete manufactured sand long age fracture parameter fracture process zone

Published: 10 October 2024 Online: 2024-10-23

CLC number:

TU528

Fund:National Natural Science Foundation of China (51768011, 52278251) and Key Projects of Guizhou Provincial Science and Technology Plan (ZK [2022] 007).

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	XU Yingjie
	CHEN Hongniao

Cite this article:

XU Yingjie,CHEN Hongniao. Fracture Parameters and Fracture Process Zone of Long-age Manufactured-sand Recycled Aggregate Concrete[J]. Materials Reports, 2024, 38(19): 23040205-10.

URL:

http://www.mater-rep.com/EN/10.11896/cldb.23040205 OR http://www.mater-rep.com/EN/Y2024/V38/I19/23040205

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