A modelling study of drying shrinkage damage in concrete repair systems

Title

A modelling study of drying shrinkage damage in concrete repair systems

 Author

Lukovic, M.
Savija, B.
Schlangen, E.
Ye, G.
van Breugel, K.

Faculty

Civil Engineering and Geosciences

 Department

Structural Engineering

 Date

2014-07-10

 Abstract

Differential shrinkage between repair material and concrete substrate is considered to be the main cause of premature failure of repair systems (Martinola, Sadouki et al. 2001, Beushausen and Alexander 2007). Magnitude of induced stresses depends on many factors, for example the amount of restraint, moisture gradients caused by different curing and drying conditions, type of repair material, etc. Once stresses exceed the strength, two damage mechanisms may take place: debonding (curling) of the repair material or/and cracking inside the repair material or concrete substrate. Numerical simulations combined with experimental observations can be of great use when determining the influence of governing parameters and predicting the performance of a repair system. In this work, a lattice type model is used first to simulate moisture distribution inside a repair system in time, and then to model cracking caused by resulting shrinkage. The influence of substrate surface preparation, bond strength between the two materials, thickness of the repair material, and different types of repair materials is investigated. One of the promising materials which was developed recently and showed to have promising properties for application in a concrete repair is a strain hardening cementitious composite - SHCC. Benefits of applying either SHCC or concrete as a repair material over non-reinforced repair mortar are discussed.

 Subject

Concrete repair
shrinkage
strain-hardening cementitious composite (SHCC)
lattice model

 To reference this document use:

http://resolver.tudelft.nl/uuid:0dff72a4-8059-49c2-8d82-4ea3bdfc203d

 Publisher

The Electrochemical Society

 Source

Structural faults and repair conference 2014, 8 – 10 July 2014, London, UK

 Part of collection

Institutional Repository

 Document type

conference paper

 Rights

(c) Lukovic, M.
Savija, B.
Schlangen, E.
Ye, G.
van Breugel, K.
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PDF 306530.pdf 5.06 MB
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