Computers and Concrete

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Investigation of rate dependent shear bond properties of concrete masonry mortar joints under high-rate loading

  • John E. Hatfield (U.S. Army Engineer Research and Development Center, Geotechnical and Structures Laboratory) ;
  • Genevieve L. Pezzola (U.S. Army Engineer Research and Development Center, Geotechnical and Structures Laboratory) ;
  • John M. Hoemann (U.S. Army Engineer Research and Development Center, Geotechnical and Structures Laboratory) ;
  • James S. Davidson (Department of Civil Engineering, Auburn University)
  • Received : 2023.11.21
  • Accepted : 2024.02.07
  • Published : 2024.05.25
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Abstract

Many materials including cementitious concrete-type materials undergo material property changes during high-rate loading. There is a wealth of research regarding this phenomenon for concrete in compression and tension. However, there is minimal knowledge about how mortar material used in concrete masonry unit (CMU) construction behaves in high-rate shear loading. A series of experiments was conducted to examine the bond strength of mortar bonded to CMU units under high-rate shear loading. A novel experimental setup using a shock tube and dynamic ram were used to load specially constructed shear triplets in a double lap shear configuration with no pre-compression. The Finite Element Method was leveraged in conjunction with data from the experimental investigation to establish if the shear bond between concrete masonry units and mortar exhibits any rate dependency. An increase in shear bond strength was observed when loaded at a high strain rate. This data indicates that the CMU-mortar bond exhibits a rate dependent strength change and illustrates the need for further study of the CMU-mortar interface characteristics at high strain rates.

Keywords

Acknowledgement

The lead author (J.E.H.) received support through the SMART fellowship from the U.S. Department of Defense, which provided valuable support and gave ample opportunity to receive guidance from highly knowledgeable individuals at the U. S. Army Engineer Research and Development Center (ERDC). The use of trade, product, or firm names in this document is for descriptive purposes only and does not imply endorsement by the U.S. Government. The tests described and the resulting data presented herein, unless otherwise noted, are based on work conducted by the U.S. Army ERDC. Permission was granted by the Director, Geotechnical and Structures Laboratory to publish this information. The support and expertise provided by the Concrete Masonry and Hardscapes Association (CMHA) was invaluable. Their knowledgeable laboratory staff conducted the standard ASTM masonry tests with precision and gladly answered any questions. They also modified their testing equipment to successfully execute the EN 1052-3 static shear test, which does not fall in their standard test suite.

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