High-strength concretes have a lower water-cement ratio than conventional concretes, which makes them more prone to self-desiccation, resulting in autogenous shrinkage and cracking. The lower watercement ratio gives the concrete a higher compressive strength. In my diploma thesis, I studied high-strength concretes with glass fibres addition. I investigated the effect of glass fibres on the time develpment of autogenous shrinkage in high-strength concrete. I mixed 12 mm glass fibres into the concrete mix. The experimental work was carried out in the laboratory of the Faculty of Civil and Geodetic Engineering. The results of the measurements of autogenous shrinkage and compressive strength were compared with a comparable concrete without fibres. After analysing the measurement results, I found out that glass fibres reduce the autogenous shrinkage and increase the compressive strength of high-strength concrete.
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