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2020, Volume 14, Issue 3

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Frontiers of Structural and Civil Engineering >> 2020, Volume 14, Issue 3 doi: 10.1007/s11709-020-0629-0

The effects of mismatch fracture properties in encapsulation-based self-healing concrete using cohesive-zone model

. Institute of Structural Mechanics, Bauhaus University of Weimar, Weimar 99423, Germany.. Department of Civil Engineering, Politeknik Negeri Bandung (POLBAN), Bandung 40012, Indonesia.. Division of Computational Mechanics, Ton Duc Thang University, Ho Chi Minh City, Vietnam.. Faculty of Civil Engineering,Ton Duc Thang University, Ho Chi Minh City, Vietnam

Received: 2020-05-13 Accepted: 2020-06-17 Available online: 2020-06-17
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Abstract

Finite element analysis is developed to simulate the breakage of capsule in capsule-based self-healing concrete. A 2D circular capsule with different core-shell thickness ratios embedded in the mortar matrix is analyzed numerically along with their interfacial transition zone. Zero-thickness cohesive elements are pre-inserted into solid elements to represent potential cracks. This study focuses on the effects of mismatch fracture properties, namely fracture strength and energy, between capsule and mortar matrix into the breakage likelihood of the capsule. The extensive simulations of 2D specimens under uniaxial tension were carried out to investigate the key features on the fracture patterns of the capsule and produce the fracture maps as the results. The developed fracture maps of capsules present a simple but valuable tool to assist the experimentalists in designing appropriate capsule materials for self-healing concrete.

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