When concrete is cast, heat develops. When the concrete cools down there is a risk that thermal gradients induce cracks in the structure. In the Middle East this is especially important as extensive heat builds up due to the high ambient temperatures. Possible formed cracks will have a detrimental effect on the overall durability of the structure, especially when placed in or close to a marine environment, and especially if placed in a hot and aggressive environment. In order to minimize the risk of inducing thermal cracks, temperature and stress requirements during the hardening period must be set forward. Temperature and stress calculations are rational tools, when appropriate hardening precautions are planned for, in order to fulfil the requirements. MAGMAconcrete can be used for conducting temperature and stress calculations. MAGMAconcrete is based on a 3-Dimensional numerical model for the thermo-mechanical conditions during hydration of early age concrete. Material properties as a function of maturity and environmental conditions form the basis of the model. This paper presents temperature and stress calculation results using MAGMAconcrete, and proposed hardening precautions for two different structures where 3-D calculations are found to be required. Finally, the experience gained with the proposed hardening precautions is presented.
|Title of host publication||Concrete in Hot and Aggressive Environments|
|Publication status||Published - 2003|
|Event||7th Int Conf on Concrete in Hot and Aggressive Environments - Bahrain|
Duration: 5 Nov 1829 → …
|Conference||7th Int Conf on Concrete in Hot and Aggressive Environments|
|Period||05/11/1829 → …|
Jensen, P., Buhr, B., Thorborg, J., Hattel, J., Jeppesen, P., & Coff, N. (2003). 3-D Temperature and Stress Simulations of Hardening Concrete. In Concrete in Hot and Aggressive Environments http://www.ipl.dtu.dk/publikation/7975/dk/