Control of the curing process for hybrid concrete in post-tensioned slabs
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Through the computer-based curing technology program CrackTeSt COIN, the thesis has made measurements of two concrete compositions with high pozzolan dosage, respectively 50% and 65% of the total effective binder. The task is related to Skanska's project Gullhaug Torg 2A, designed with post-tensioned slabs, where the mentioned concrete will be used. Due to the tensioning of compressive forces and the project's progress, the slabs must achieve a compressive strength of 25 MPa within 3 days. This has led to the thesis dealing with the concrete's development of mechanical properties in the form of temperature and compressive strength. This study has shown that the environmental ambitions regarding concrete are possible but that it entails challenges due to the concrete's low heat development and relatively slow strength development. At minus degrees, it is imperative to control the curing process with the correct use of measures and possibly use the concrete with the lowest amount of pozzolans. The pozzolan reaction proceeds slowly at low temperatures and rapidly at high temperatures. The results have shown that progress can be accelerated at high temperatures as the required strength is well within the 3-day requirement.