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Reducing Thermal Crack Risks Caused by Restraint in Young Concrete - A Case Study on Walls of Water Tanks
Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Byggkonstruktion och brand.ORCID-id: 0000-0002-9987-0174
Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Byggkonstruktion och brand.
Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Byggkonstruktion och brand.ORCID-id: 0000-0002-3459-2855
2022 (engelsk)Inngår i: Nordic Concrete Research, ISSN 0800-6377, Vol. 66, nr 1, s. 41-54Artikkel i tidsskrift (Fagfellevurdert) 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.

sted, utgiver, år, opplag, sider
Walter de Gruyter, 2022. Vol. 66, nr 1, s. 41-54
HSV kategori
Forskningsprogram
Byggkonstruktion
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URN: urn:nbn:se:ltu:diva-92219DOI: 10.2478/ncr-2022-0001ISI: 000825200600004OAI: oai:DiVA.org:ltu-92219DiVA, id: diva2:1684209
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Validerad;2022;Nivå 2;2022-07-21 (sofila)

Tilgjengelig fra: 2022-07-22 Laget: 2022-07-22 Sist oppdatert: 2023-09-05bibliografisk kontrollert

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Al-Gburi, MajidJonasson, Jan-ErikNilsson, Martin

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