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Temperatursprickor i ung betong: Utvärdering av projektering och utförande av åtgärder, samt utveckling av dimensioneringsmetod för kylsystem
KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Building Technology and Design.
KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Building Technology and Design.
2011 (Swedish)Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesisAlternative title
Thermal cracks in young concrete (English)
Abstract [en]

The report contains three parts. The first part is a summary and overall presentation of thermal

cracks and preventing measures against such cracks. This is a theoretical part where the

interested designer can get acquainted with various alternatives, be guided to more detailed

literature, and receive some practical information regarding the design of the respective

measures.

The second part deals with calculation of the risk for thermal cracks and design of water cooling

as a limiting measure. Two complementary methods are reviewed for efficient calculation:

the handbook method CraX1

(by Lulea University of Technology) is used for quick

verification

finite differential analysis in the calculation

tool ConTeSt Pro for more precise projecting

Here is also presented a development of existing standards through design of the cooling system

by means of the Bernoulli equation. Comparison is made with the approximation with

Manning’s formula, which occurs in the field today. The calculation part is concluded with a

calculation example. In addition to prescribing good project planning, the example also

highlights some of the calculation programs’ possibilities and limitations.

The third part of the report evaluates the current calculation of the risk for thermal cracking in

young concrete, as well as the design and implementation of thereto related measures. This is

done through studies of reference objects and interviews with all parts involved, i.e. clients,

consultants, contractors and suppliers. The report aims to a compilation and transfer of skill and

experience, so that potential for improvement in the prevention of thermal cracking can be

identified, and the design can be improved with regard to the conditions of the construction

phase.

Abstract [sv]

Rapporten innehaller tre delar. Den forsta delen utgor en sammanstallning och oversiktlig

presentation av temperatursprickor samt forebyggande atgarder mot sadana sprickor. Det ar en

teoretisk del dar den intresserade projektoren kan satta sig in i olika alternativ, vagledas till

utforligare litteratur, samt fa en del praktisk information infor projekteringen av respektive

atgard.

Den andra delen avhandlar berakning av risk for temperatursprickor samt projektering av

vattenkylning som sprickbegransande atgard.

Tva kompletterande

metoder gas igenom for

effektiv berakning:

handboksmetoden CraX1 (fran Lulea tekniska universitet) for snabbare kontroller

finita differensanalyser i berakningsprogrammet ConTeSt Pro for noggrannare

projektering

Har presenteras aven en utveckling av nuvarande standarder via dimensionering av kylsystem

for vatskekylning med hjalp av Bernoullis ekvation. Jamforelse gors med approximationen med

Mannings formel, vilken i dagslaget forekommer i branschen. Berakningsdelen avslutas med ett

berakningsexempel. Forutom att foreskriva god projektering, belyser exemplet dessutom nagra

av berakningsprogrammens mojligheter och begransningar.

Rapportens tredje del utvarderar den nuvarande berakningen av risk for temperatursprickor i

ung betong, samt projekteringen och genomforandet av tillhorande atgarder. Detta gors via

studier av referensobjekt och intervjuer med samtliga involverade aktorer, d.v.s. bestallare,

konstruktorer, entreprenorer och leverantorer. Rapporten syftar till en sammanstallning och

aterforing av kompetens och erfarenhet, sa att forbattringspotential i forebyggandet av

temperatursprickor kan identifieras, och projekteringen kan forbattras med hansyn till

produktionens forutsattningar.

Place, publisher, year, edition, pages
2011. , 165 p.
Series
Exjobb byggteknik 6 design, 2011;26
Keyword [en]
Temperatursprickor; Ung betong; Vattenkylning; Feedback; Åtgärder;, Thermal cracks; Young concrete; Water cooling; Feedback; Measures; Design;
National Category
Construction Management
Identifiers
URN: urn:nbn:se:kth:diva-49215OAI: oai:DiVA.org:kth-49215DiVA: diva2:459403
Subject / course
Constructional Engineering and Design
Educational program
Bachelor of Science in Engineering - Constructional Engineering and Design
Uppsok
Technology
Supervisors
Examiners
Available from: 2011-11-25 Created: 2011-11-25 Last updated: 2011-11-25Bibliographically approved

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