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Reducing Thermal Crack Risks Caused by Restraint in Young Concrete - A Case Study on Walls of Water Tanks
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Fire Engineering.ORCID iD: 0000-0002-9987-0174
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Fire Engineering.
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Fire Engineering.ORCID iD: 0000-0002-3459-2855
2022 (English)In: Nordic Concrete Research, ISSN 0800-6377, Vol. 66, no 1, p. 41-54Article in journal (Refereed) Published
Abstract [en]

Concrete cracks in structures such as water tanks and nuclear power stations cause anxiety to owners, contractors and engineers. These cracks may significantly increase the structure’s permeability and thus increase leakage, reduce durability, and eventually lead to loss of structural functionality. Therefore it is important to minimize their occurrence and size. To identify effective ways of minimizing cracking in young concrete segments, a parametric study was conducted using the finite element method (FEM). Parameters considered include casting sequence, joint position, wall height, and cooling. The study examined continuous and jumped casting approaches to the casting of a cylindrical reinforced concrete tank for a sewage-treatment plant, with and without the application of the ‘kicker’ technique in which the lower part of the wall is cast with the slab. The main cause of cracking is thermal change and restraint imposed by adjacent older structures, and the FEM predictions agree well with experimental observations. Continuous casting is most effective at minimizing cracking because it creates only two contact edges between newly cast and existing structures producing the lowest level of restraint. The kicker technique is shown to be very effective for reducing restraint and consider rephasing.

Place, publisher, year, edition, pages
Walter de Gruyter, 2022. Vol. 66, no 1, p. 41-54
National Category
Manufacturing, Surface and Joining Technology Construction Management
Research subject
Structural Engineering
Identifiers
URN: urn:nbn:se:ltu:diva-92219DOI: 10.2478/ncr-2022-0001ISI: 000825200600004OAI: oai:DiVA.org:ltu-92219DiVA, id: diva2:1684209
Note

Validerad;2022;Nivå 2;2022-07-21 (sofila)

Available from: 2022-07-22 Created: 2022-07-22 Last updated: 2023-09-05Bibliographically approved

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Al-Gburi, MajidJonasson, Jan-ErikNilsson, Martin

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