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In-Situ and Laboratory Investigation on Leaching and Effects of Early Curing of Shotcrete
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: 0000-0001-8336-1247
2019 (English)In: Nordic Concrete Research, ISSN 0800-6377, ISSN 0800-6377, Vol. 61, no 2, p. 23-37Article in journal (Refereed) Published
Abstract [en]

During the construction of a rock tunnel in Stockholm, several sections with leaching shotcrete (sprayed concrete) were found one year after the spraying was completed. An investigation was therefore conducted, and its results are presented in this paper. The amount of leaching after such a short time indicated that a one-sided water pressure existed in combination with a permeable shotcrete. The reason for the water pressure was likely a partly unsuccessful grouting that created sections with leaking water. The permeable shotcrete could be a combined result of insufficient curing and the use of accelerators, and the effect of in-situ curing was therefore investigated. A total of six slabs were sprayed and cured under different conditions in the tunnel. Test results according to standards indicated that curing has no significant effect on the development of mechanical strength or water penetration through the shotcrete. However, this is believed to be a result of the test method rather than the non-existing effect of curing. Lastly, some modifications to the test standard were proposed for future studies of in-situ curing.

Place, publisher, year, edition, pages
2019. Vol. 61, no 2, p. 23-37
Keywords [en]
shotcrete, curing, experiments, investigation, testing
National Category
Infrastructure Engineering
Research subject
Civil and Architectural Engineering, Concrete Structures
Identifiers
URN: urn:nbn:se:kth:diva-266762DOI: 10.2478/ncr-2019-0014ISI: 000508428100002OAI: oai:DiVA.org:kth-266762DiVA, id: diva2:1386978
Funder
Rock Engineering Research Foundation (BeFo), 379
Note

QC 20200123

Available from: 2020-01-20 Created: 2020-01-20 Last updated: 2020-02-10Bibliographically approved

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