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<p>Autoclaved lightweight concrete (ALC) are widely used in non-load-bearing walls due to their lightweight, thermal insulation, and low cost. However, their low strength, high water absorption, and poor impact resistance limit their application in load-bearing structures. Although several reinforcement strategies have been proposed, the role of interface materials in optimizing the ALC-concrete system remains unclear. This study systematically investigates the performance of four interfacial treatments: no treatment (N), mortar material (MM), cementitious penetration crystallization material (CPCM), and wall hardener material (WHM). The investigation employs bidirectional shear experiments (BSE), fracture experiments (FE), and water absorption experiments (WAE), combined with theoretical modeling and finite element analysis (FEA). The results indicate that the MM-treated interface exhibits the best shear properties, while the N-treated interface demonstrates superior flexural properties due to enhanced bonding from concrete slurry penetration. The MM treatment also minimizes the water absorption of ALC. Furthermore, this study proposes a calculation method and a finite element model (FEM) for the interface shear ultimate bearing capacity, providing a theoretical and simulation framework for enhancing ALC strength and expanding its application in load-bearing structures.</p>

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Experimental and computational investigation of interfacial properties in fine-aggregate concrete-toughened ALC

  • 期刊论文

  • 发表日期：

    2026年2月10日

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  • Biao Zhang,
  • Hetao Hou,
  • Yuanyuan Sun,
  • Ning Wang,
  • Daoyong Wang,
  • Junjie Wang,
  • Ruofan Lu,
  • Zhihao Du

摘要

Autoclaved lightweight concrete (ALC) are widely used in non-load-bearing walls due to their lightweight, thermal insulation, and low cost. However, their low strength, high water absorption, and poor impact resistance limit their application in load-bearing structures. Although several reinforcement strategies have been proposed, the role of interface materials in optimizing the ALC-concrete system remains unclear. This study systematically investigates the performance of four interfacial treatments: no treatment (N), mortar material (MM), cementitious penetration crystallization material (CPCM), and wall hardener material (WHM). The investigation employs bidirectional shear experiments (BSE), fracture experiments (FE), and water absorption experiments (WAE), combined with theoretical modeling and finite element analysis (FEA). The results indicate that the MM-treated interface exhibits the best shear properties, while the N-treated interface demonstrates superior flexural properties due to enhanced bonding from concrete slurry penetration. The MM treatment also minimizes the water absorption of ALC. Furthermore, this study proposes a calculation method and a finite element model (FEM) for the interface shear ultimate bearing capacity, providing a theoretical and simulation framework for enhancing ALC strength and expanding its application in load-bearing structures.