Study on Interfacial Shear Bond Behavior Between Ceramsite Foam Concrete and Normal Concrete Under Direct Shear Loading

Li, Mushan; Tang, Zhenyun; Li, Zhenbao; Gao, Chongming; Ma, Hua

doi:10.3390/buildings16030483

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Study on Interfacial Shear Bond Behavior Between Ceramsite Foam Concrete and Normal Concrete Under Direct Shear Loading

by

Mushan Li

¹,

Zhenyun Tang

¹,

Zhenbao Li

^1,*,

Chongming Gao

¹ and

Hua Ma

²

¹

The Key Laboratory of Urban Security and Disaster Engineering, Ministry of Education, Beijing University of Technology, Beijing 100124, China

²

College of Architecture and Civil Engineering, Tianjin Renai College, Tianjin 301636, China

^*

Author to whom correspondence should be addressed.

Buildings 2026, 16(3), 483; https://doi.org/10.3390/buildings16030483

Submission received: 16 December 2025 / Revised: 18 January 2026 / Accepted: 22 January 2026 / Published: 23 January 2026

(This article belongs to the Section Building Materials, and Repair & Renovation)

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Abstract

Ceramsite foam concrete (CFC), recognized for its lightweight, thermal insulation, and eco-friendly properties, is a promising material for composite structures. The interfacial shear bond behavior between CFC and normal concrete (NC) critically governs the structural integrity of CFC-NC systems. This study investigates the interfacial shear bond strength through direct double shear tests on twelve cubic specimens with controlled interface roughness and casting intervals. Quantitative analysis reveals that increased roughness enhances shear strength by up to 28.6~59.5%, while prolonged casting intervals reduce strength by 22.3~34.6%. Notably, excessive roughness shifts failure modes from interfacial debonding to material failure within CFC, where shear bond strength becomes governed by CFC’s compressive strength. A rigid–plastic model is developed to characterize the shear bond behavior of CFC-NC interface and demonstrates 96% accuracy in predicting experimental results. The findings provide useful insights for improving CFC-NC composite design in engineering applications.

Keywords: ceramsite foam concrete; shear bond behavior; direct double shear tests; interface roughness; rigid–plastic model

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MDPI and ACS Style

Li, M.; Tang, Z.; Li, Z.; Gao, C.; Ma, H. Study on Interfacial Shear Bond Behavior Between Ceramsite Foam Concrete and Normal Concrete Under Direct Shear Loading. Buildings 2026, 16, 483. https://doi.org/10.3390/buildings16030483

AMA Style

Li M, Tang Z, Li Z, Gao C, Ma H. Study on Interfacial Shear Bond Behavior Between Ceramsite Foam Concrete and Normal Concrete Under Direct Shear Loading. Buildings. 2026; 16(3):483. https://doi.org/10.3390/buildings16030483

Chicago/Turabian Style

Li, Mushan, Zhenyun Tang, Zhenbao Li, Chongming Gao, and Hua Ma. 2026. "Study on Interfacial Shear Bond Behavior Between Ceramsite Foam Concrete and Normal Concrete Under Direct Shear Loading" Buildings 16, no. 3: 483. https://doi.org/10.3390/buildings16030483

APA Style

Li, M., Tang, Z., Li, Z., Gao, C., & Ma, H. (2026). Study on Interfacial Shear Bond Behavior Between Ceramsite Foam Concrete and Normal Concrete Under Direct Shear Loading. Buildings, 16(3), 483. https://doi.org/10.3390/buildings16030483

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Study on Interfacial Shear Bond Behavior Between Ceramsite Foam Concrete and Normal Concrete Under Direct Shear Loading

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