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Investigation of non-linear drying shrinkage for end-restrained shotcrete of varying thickness
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.
2018 (English)In: Magazine of Concrete Research, ISSN 0024-9831, E-ISSN 1751-763X, Vol. 70, no 6, p. 271-279Article in journal (Refereed) Published
Abstract [en]

Tunnels in hard, jointed rock are commonly reinforced with shotcrete (sprayed concrete) applied directly on the irregular rock surface. The thickness for such linings can be as small as 50 mm, which result in a fast drying. The resulting shrinkage of the restrained lining is a well-known phenomenon, which leads to cracking. The installation of drainage systems also results in an end-restrained shotcrete lining that is more prone to shrinkage cracking. The drying process is a complex problem that depends on multiple factors such as cement content, porosity and ambient air conditions (i.e. temperature, relative humidity and wind speed). Two numerical models capable of capturing the structural effects of drying shrinkage were compared in this study. It was found that inclusion of non-linear drying shrinkage is important for accurately describing crack initiation in an end-restrained shotcrete slab. The best fit to the experimental data was obtained when the rate of drying was described as a non-linear decreasing function.

Place, publisher, year, edition, pages
ICE Publishing , 2018. Vol. 70, no 6, p. 271-279
Keywords [en]
cracks & cracking, shrinkage, slabs & plates
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:kth:diva-223781DOI: 10.1680/jmacr.17.00171ISI: 000425130400001Scopus ID: 2-s2.0-85042038519OAI: oai:DiVA.org:kth-223781DiVA, id: diva2:1188309
Funder
Rock Engineering Research Foundation (BeFo)
Note

QC 20180307

Available from: 2018-03-07 Created: 2018-03-07 Last updated: 2018-04-03Bibliographically approved

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Sjölander, AndreasAnsell, Anders

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CiteExportLink to record
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  • apa
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