Shrinkage stress damage effect in concrete patch repair

Author(s): M.A. Shazali, M.K. Rahman, M.H. Baluch
Paper category: Conference
Book title: Concrete Repair, Rehabilitation and Retrofitting III (ICCRRR)
Editor(s): M.G. Alexander, H.-D. Beushausen, F. Dehn, P. Moyo
Print ISBN: 978-0-415-89952-9
Publisher: Taylor & Francis Group
Pages: 385- 386
Total Pages: 2
Language: English

Abstract: 
The performance of concrete patch repair is of great concern to concrete repair industry striving to ensure repair overlays that are safely maintained in working and durable condition. The strength and durability performance of concrete repair may be measured in terms of its resistance to cracking and to its primary dependence upon moisture transport. Addressing the performance of concrete patch repair therefore requires a multi-facetted approach to the identification of failure modes related to interaction between moisture flow, shrinkage resistance and associated creep relief. In this paper a coupled approach regarding nonlinear moisture diffusion that includes the effect of shrinkage associated stress damage in concrete patch repair system was considered in modeling the moisture transport criterion. Since distressed repair surfaces cannot be expected to connect surface to environmental moistures in accordance with constant surface factor approach, it follows that shrinkage associated damage adjusted moisture transfer coefficient, in addition to moisture dependent diffusion coefficient, should be considered elemental transport properties with regard to realistic simulation, analysis, and design strategies for structural problems of concrete patch repair under service field conditions. In order to assess the effectiveness of the coupled moisture and shrinkage dependent diffusivity analysis, patch repair problem was investigated with and without considerations of the effects of shrinkage associated stress damage on structural repair response histories. In the light of improved prediction accuracy to an experimental data achieved in the present study, effects of shrinkage associated stress damage must not be neglected in modeling moisture migration in restrained and highly shrinking materials like repair mortar overlays.

Online publication: 2014
Publication Type: abstract_only
Public price (Euros): 0.00