Temperatursprickor i ung betong
Utvärdering av projektering och utförande av åtgärder, samt utveckling av dimensioneringsmetod för kylsystem
Temperatursprickor; Ung betong; Vattenkylning; Feedback; Åtgärder;Thermal cracks; Young concrete; Water cooling; Feedback; Measures; Design;
The report contains three parts. The first part is a summary and overall presentation of thermalcracks and preventing measures against such cracks. This is a theoretical part where theinterested designer can get acquainted with various alternatives, be guided to more detailedliterature, and receive some practical information regarding the design of the respectivemeasures.The second part deals with calculation of the risk for thermal cracks and design of water coolingas a limiting measure. Two complementary methods are reviewed for efficient calculation:?the handbook method CraX1(by Lulea University of Technology) is used for quickverification?finite differential analysis in the calculationtool ConTeSt Pro for more precise projectingHere is also presented a development of existing standards through design of the cooling systemby means of the Bernoulli equation. Comparison is made with the approximation withManning?s formula, which occurs in the field today. The calculation part is concluded with acalculation example. In addition to prescribing good project planning, the example alsohighlights some of the calculation programs? possibilities and limitations.The third part of the report evaluates the current calculation of the risk for thermal cracking inyoung concrete, as well as the design and implementation of thereto related measures. This isdone 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 andexperience, so that potential for improvement in the prevention of thermal cracking can beidentified, and the design can be improved with regard to the conditions of the constructionphase.