Steel and Composite Structures

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Investigating loading rate and fibre densities influence on SRG - concrete bond behaviour

  • Received : 2019.07.29
  • Accepted : 2019.10.21
  • Published : 2020.03.25
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Abstract

This work features the outcomes of an empirical investigation into the characteristics of steel reinforced grout (SRG) composite - concrete interfaces. The parameters varied were loading rate, densities of steel fibres and types of load displacement responses or measurements (slip and machine grips). The following observations and results were derived from standard single-lap shear tests. Interfacial debonding of SRG - concrete joints is a function of both fracture of matrix along the bond interface and slippage of fibre. A change in the loading rate results in a variation in peak load (Pmax) and the correlative stress (σmax), slip and machine grips readings at measured peak load. Further analysis of load responses revealed that the behaviour of load responses is shaped by loading rate, fibre density as well as load response measurement variable. Notably, the out-of-plane displacement at peak load increased with increments in load rates and were independent of specimen fibre densities.

Keywords

Acknowledgement

The authors convey sincere appreciations to Dr. Christian Carloni, as well as the technicians of LISG (Laboratory of Structural and Geotechnical Engineering) and CIRI (Interdepartmental Centre for Industrial Research in Building and Construction) for sharing their knowledge and wisdom throughout this research during the first author's sabbatical leave at University of Bologna, Italy. Also not forgetting Kerakoll of Sassuolo, Italy, whom the authors acknowledge for providing composite materials for testing.

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