Analysis of interfacial shrinkage stresses in patch repairs

MANGAT, P. S. and O'FLAHERTY, Fin (2004). Analysis of interfacial shrinkage stresses in patch repairs. Magazine of concrete research, 56 (7), 375-385.

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Abstract

This paper presents simple analytical expressions that predict the interfacial shrinkage stresses in a repair patch over time. Four repair materials (L2, L3, L4 and G1) were applied by spraying (gunite) to unpropped compression members of two highway structures, and their performance was monitored to approximately six months' age. The elastic moduli of all the repair materials, E rm , were greater than the elastic moduli of the substrate concrete, E sub . The mechanics of patch repair interaction with the substrate were established, and analytical models, based on an analogy of the bimetallic strip undergoing a drop in temperature, were developed. Basic properties of the repair material (elastic modulus, shrinkage and tensile creep) and substrate concrete (elastic modulus), and geometrical details of the repair patch, are required to analyse the interfacial stresses in the repair patch. Verification of the analytical procedures is based on the field data, and the results show a satisfactory correlation between the actual and predicted stress redistribution.

Item Type:	Article
Additional Information:	Copyright: Thomas Telford Limited
Research Institute, Centre or Group - Does NOT include content added after October 2018:	Materials and Engineering Research Institute > Structural Materials and Integrity Research Centre > Centre for Infrastructure Management
Identification Number:	https://doi.org/10.1680/macr.56.7.375.46714
Page Range:	375-385
Depositing User:	Ann Betterton
Date Deposited:	08 Feb 2008
Last Modified:	18 Mar 2021 13:51
URI:	https://shura.shu.ac.uk/id/eprint/665

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