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In the United States, single-leaf (single-wythe) construction is used widely. However, thermal considerations, coupled with broader objectives to increase operational energy efficiency, have driven the development of an array of various integrally-insulated concrete masonry units (CMU). When grout (with or without embedded reinforcement) is placed in the cells of integrally-insulated CMU, the insulation effectively debonds the grout from portions of the surrounding CMU. This has raised the question of whether the composite nature of the assembly may be compromised or otherwise perform differently compared to masonry without integral insulation. Drawing from the results of a comprehensive physical testing program, this paper presents findings that demonstrate masonry assemblies containing insulation inserts perform compositely and are similar to conventionally grouted and reinforced masonry construction. In addition, the results of reinforcement lap splice tests are provided and compared to the detailing and performance criteria of TMS 402, Building Code Requirements for Masonry Structures. The conclusions of this investigation validate the use of the TMS 402 provisions when designing and detailing these specific integrally-insulated concrete masonry assemblies. The results should not be applied to other integrally-insulated systems.

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The Effect of Insulation Inserts on the Composite Performance of Reinforced Concrete Masonry Walls

  • 会议论文

  • 发表日期：

    2025年

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  • David Biggs,
  • Jason Thompson,
  • Arturo Schultz

摘要

In the United States, single-leaf (single-wythe) construction is used widely. However, thermal considerations, coupled with broader objectives to increase operational energy efficiency, have driven the development of an array of various integrally-insulated concrete masonry units (CMU). When grout (with or without embedded reinforcement) is placed in the cells of integrally-insulated CMU, the insulation effectively debonds the grout from portions of the surrounding CMU. This has raised the question of whether the composite nature of the assembly may be compromised or otherwise perform differently compared to masonry without integral insulation. Drawing from the results of a comprehensive physical testing program, this paper presents findings that demonstrate masonry assemblies containing insulation inserts perform compositely and are similar to conventionally grouted and reinforced masonry construction. In addition, the results of reinforcement lap splice tests are provided and compared to the detailing and performance criteria of TMS 402, Building Code Requirements for Masonry Structures. The conclusions of this investigation validate the use of the TMS 402 provisions when designing and detailing these specific integrally-insulated concrete masonry assemblies. The results should not be applied to other integrally-insulated systems.