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Investigation of shrinkage cracking in shotcrete on tunnel drains
KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Concrete Structures.
2010 (English)In: Tunnelling and Underground Space Technology, ISSN 0886-7798, Vol. 25, no 5, 607-613 p.Article in journal (Refereed) Published
Abstract [en]

The presented investigation combines in situ observations, measurements, testing and theoretical modelling. The in situ work was done to map and evaluate the shrinkage related cracking of shotcrete on short and long sections of soft, plastic drains. The occurrence of variation in shotcrete thickness and crack widths were of particular interest. The theoretical analysis focuses on the stresses that can occur due to uneven drying shrinkage in the two-layered shotcrete. The models used include variation in shotcrete thickness and in time of waiting between turns of spraying, with or without watering of the shotcrete. Watering will delay the shrinkage but has no effect on the strength development. Long times of waiting without watering before spraying a second layer will increase the tensile stresses in the shotcrete. It is recommended that the further work is directed towards establishing guidelines for the design of future drain constructions with shotcrete. Different methods for repair and strengthening of cracked shotcreted drains must be developed, tested and evaluated.

Place, publisher, year, edition, pages
2010. Vol. 25, no 5, 607-613 p.
Keyword [en]
Shotcrete, Drain, Shrinkage, Cracking, Watering
National Category
Infrastructure Engineering
URN: urn:nbn:se:kth:diva-46627DOI: 10.1016/j.tust.2010.04.006ISI: 000279532800012ScopusID: 2-s2.0-77953356935OAI: diva2:455138

QC 20111108

Available from: 2011-11-08 Created: 2011-11-04 Last updated: 2015-09-21Bibliographically approved

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