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Gjutning av vägg på platta: studier av sprickrisker orsakat av temperaturförloppet vid härdningen
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
Cement- och betonginstitutet.
2009 (Swedish)Report (Other academic)Alternative title
Casting of concrete walls on slabs : Studies of the risk of cracking due to temperature changes during the hardening process (English)
Abstract [en]

Tests casting the construction "wall on slab" have in the project been realized for three different situations. Measurements have been performed with respect to temperatures, deformations, strains and mapping of crack patterns. In addition, properties for the young concrete have been investigated to get basic data in order to estimate temperatures and risks of cracking. The construction wall on slab represents a typical case, which can be found in many real structures like walls, retaining walls, tray structures, tunnels and bridges.The project has two main questions: 1) What are the differences in restraint conditions between the three tested constructions? Is it correct to model a wall, that both has a horizontal casting joints against the slab, and a vertical casting joint against an adjacent wall, with a free wall of double length?, and 2) Does a slip in the horizontal casting joint exist, and does is reduce the restraint in the wall?The answers are that the supposed models describe the real behaviour very well. This was confirmed by the fact that both the temperatures as well as the crack risks agreed very well between the test results and the calculation results. For the walls that cracked a slip in the casting joints could be indicated, but these test results could not be quantified. In summary, the project has been successful and clearly answered questions that previously only were based on assumptions.

Abstract [sv]

Försök med gjutning av konstruktionen "vägg på platta" har i projektet genomförts för tre olika situationer. Mätningar har utförts vad gäller temperaturer, deformationer, töjningar och sprickkarteringar. Dessutom har den unga betongens egenskaper kartlagts för att få underlag att kunna göra temperatur- och sprickriskberäkningar. Konstruktionen vägg på platta representerar en typkonstruktion, som återfinns i många verkliga konstruktioner såsom väggar, stödmur, tråg, tunnlar och broar.Projektet har två huvudfrågor: 1) Hur skiljer sig tvånget mellan de tre provade konstruktionerna? Är det rätt att modellera en vägg, som båda har en horisontell gjutfog mot plattan och en vertikal gjutfog mot befintlig vägg, med en fristående dubbelt så lång vägg? och 2) Finns det en glidning i den horisontella gjutfogen, vilket reducerar tvånget i väggen?Svaren blev att antagna modeller väl beskriver det verkliga beteendet. Detta bygger på att både temperaturen och spänningsriskerna överensstämmer mycket väl mellan försök och beräkningar. Vid de väggjutningar som ledde till sprickbildning kunde en gjutfogsglidning indikeras, men dessa försöksresultat kunde inte kvantifieras. Sammantaget kan sägas att projektet varit lyckat och entydigt besvarat frågeställningar som tidigare endast varit antaganden.

Place, publisher, year, edition, pages
Luleå: Luleå tekniska universitet, 2009. , 80 p.
Series
Research report / Luleå University of Technology, ISSN 1402-1528
National Category
Infrastructure Engineering
Research subject
Structural Engineering
Identifiers
URN: urn:nbn:se:ltu:diva-23353Local ID: 6a0d5db0-800b-11de-8da0-000ea68e967bISBN: 978-91-86233-73-0 (print)OAI: oai:DiVA.org:ltu-23353DiVA: diva2:996402
Note
Godkänd; 2009; 20090803 (jej)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2017-11-24Bibliographically approved

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