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Effect of shrinkage on slant shear and flexure bond strength of cement based micro-concrete for durable concrete repair

Effect of shrinkage on slant shear and flexure bond strength of cement based micro-concrete for... The micro-concrete repair failure is a subject of concern since the information about the bond strength is not available in literature. The available data on bond strength differs based on the type of test procedure used in various studies, there is no universally accepted test protocol available for determining the bonding strength of cement-based micro-concrete. In the present work, two test methodologies investigated for measuring the bonding strength of micro-concretes. The slant shear and the three-point flexure tests were conducted similar to ASTM C882and ASTM C348 test procedure, respectively. Mechanical properties such as compressive strength and flexure, as well as durability property, such as drying shrinkage of the micro-concretes were determined to support the evaluation of bonding strength. Further, the specimens were analyzed using finite element analysis (FEA) to find reasons behind the failure patterns. It was observed that the compressive strength of the micro-concrete does not influence any kind of bonding strength calculations. The stress concentration and displacement at the joint near the low bond strength elements were found to be disproportionately high as indicated by FEA, causing the specimens to fail sooner than those with high bond strength elements at the interface. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Building Pathology and Rehabilitation Springer Journals

Effect of shrinkage on slant shear and flexure bond strength of cement based micro-concrete for durable concrete repair

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References (28)

Publisher
Springer Journals
Copyright
Copyright © The Author(s), under exclusive licence to Springer Nature Switzerland AG 2022
ISSN
2365-3159
eISSN
2365-3167
DOI
10.1007/s41024-021-00161-y
Publisher site
See Article on Publisher Site

Abstract

The micro-concrete repair failure is a subject of concern since the information about the bond strength is not available in literature. The available data on bond strength differs based on the type of test procedure used in various studies, there is no universally accepted test protocol available for determining the bonding strength of cement-based micro-concrete. In the present work, two test methodologies investigated for measuring the bonding strength of micro-concretes. The slant shear and the three-point flexure tests were conducted similar to ASTM C882and ASTM C348 test procedure, respectively. Mechanical properties such as compressive strength and flexure, as well as durability property, such as drying shrinkage of the micro-concretes were determined to support the evaluation of bonding strength. Further, the specimens were analyzed using finite element analysis (FEA) to find reasons behind the failure patterns. It was observed that the compressive strength of the micro-concrete does not influence any kind of bonding strength calculations. The stress concentration and displacement at the joint near the low bond strength elements were found to be disproportionately high as indicated by FEA, causing the specimens to fail sooner than those with high bond strength elements at the interface.

Journal

Journal of Building Pathology and Rehabilitation – Springer Journals

Published: Dec 1, 2022

Keywords: Micro-concrete; Concrete repair; Drying shrinkage; Bond strength; Repair materials

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