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Shrinkage cracking of thin irregular shotcrete shells using multiphysics models
KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Concrete Structures.ORCID iD: 0000-0001-8375-581X
KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Concrete Structures.ORCID iD: 0000-0002-8000-6781
KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Concrete Structures.
KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Concrete Structures.
2016 (English)In: 9th International Conference on Fracture Mechanics of Concrete and Concrete Structures / [ed] John E. Bolander, Eric N. Landis, Victor E. Saouma, 2016Conference paper (Refereed)
Abstract [en]

Shotcrete (sprayed concrete) is commonly used to support tunnels in good quality hard rock. Including a drainage system often results in end-restrained sections of shotcrete, which have created problems with shrinkage induced cracking. In this paper a multi-physical material model with coupled behaviour between thermal actions, moisture transportation and mechanical strain has been used to model and describe the complex behaviour and effects of shrinkage of such a structure. The model was first calibrated against a free shrinkage test and then used to simulate an experimental set-up for testing of end-restrained shrinkage. The first results lead to a need of tuning of the parameters controlling the drying of the shotcrete to accurately describe the experimental results. This tuning could be an indication that the shrinkage behaviour differs between a restrained and an un-restrained sample. However, further research about possible changes in the pore structure as well as more detailed measurements of the early shrinkage behaviour is needed before any such conclusions can be drawn.

Place, publisher, year, edition, pages
2016.
Keyword [en]
Cracking, Fibre Reinforced Shotcrete, Multi-physics, Shrinkage
National Category
Infrastructure Engineering
Research subject
Civil and Architectural Engineering
Identifiers
URN: urn:nbn:se:kth:diva-186228OAI: oai:DiVA.org:kth-186228DiVA: diva2:926340
Conference
FraMCoS-9, May 29-June 1 2016
Note

QC 20160826

Available from: 2016-05-06 Created: 2016-05-06 Last updated: 2016-08-26Bibliographically approved

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Sjölander, AndreasGasch, TobiasAnsell, AndersMalm, Richard
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