he graduation thesis deals with the properties of concrete mixtures prepared with slag cement CEM III / B 32.5 N-LH / SR with low heat of hydration. Laboratory tests of fresh and hardened concrete were performed to obtain data on the properties of different mixtures. Slump test and flow table test were performed to determine the consistency of fresh concrete. Compressive strength was determined on hardened samples and elastic parameters were measured using the ultrasonic technique. The same tests were performed on concretes with Portland cement CEM II / B-M (LL-V) 42.5 N. CEM II / B types of cement are the most commonly used cements in Slovenian construction practice. After completed laboratory tests, an analysis of the test results and their comparison followed. The obtained results showed that slag cement concretes have a more liquid consistency than Portland cement concretes. Due to the slower formation of hydration products, early age mechanical properties, such as compressive strength and dynamic modulus of elasticity and shear modulus, are significantly lower in the slag cement concretes. After twenty-eight days of binder hydration, the difference in compressive strength and elastic parameters between the slag cement concrete and Portland cement concrete decreases significantly. In some cases, slag cement concrete achieves even higher mechanical properties after twenty eight days.
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