20.500.12556/RUL-127258 The relation between concrete, mortar and paste scale early age properties Microstructure development of concrete, mortar, and paste scale of cement-based material (CBM) during the early hydration stage has a significant impact on CBM’s physical, mechanical, and durability characteristics at the high maturity state. The research was carried out using compositions with increased autogenous shrinkage and extended early age period, proposed within the RRT$^+$ programme of the COST Action TU1404. The electrical conductivity method, used to follow the solidification process of CBM, is capable of determining the initial and final setting time, and the end of the solidification process acceleration stage for the paste and mortar scale. Simultaneous ultrasonic P- and S-wave transmission measurements revealed that the ratio of velocities V$_P$/V$_S$ is highly dependent on the presence of aggregates—it is considerably higher for the paste scale compared to the mortar and concrete scale. The deviation from the otherwise roughly constant ratio V$_P$/V$_S$ for each scale may indicate cracks in the material. The non-linear correlation between the dynamic and static elastic moduli valid over the three scales was confirmed. Additionally, it was found that the static E-modulus correlates very well with the square of the V$_S$ and that the V$_S$ is highly correlated to the cube compressive strength—but a separate trendline exists for each CBM scale. concrete mortar and paste scale of cement-based material early hydration stage microstructure development electrical conductivity ultrasonic method standard tests beton nivo malte in paste v betonu zgodnja starost razvoj mikrostrukture električna prevodnost ultrazvočna metoda standardni testi true false true Angleški jezik Slovenski jezik Članek v reviji 2021-05-31 12:44:34 2021-05-31 12:44:40 2022-09-06 03:50:24 0000-00-00 00:00:00 2021 0 0 24 str. iss. 6, art. 1569 Vol. 14 Mar. 2021 0000-00-00 Zaloznikova Objavljeno apc 0000-00-00 0000-00-00 0000-00-00 620.1:691 1996-1944 10.3390/ma14061569 57744899 RAZ_Klun_Martin_2021.pdf RAZ_Klun_Martin_2021.pdf 1 D1546331705B1733CBD9F6721B81F37F 1fc1a6a191c722838b471a2e7c37d5334c28d0a0a45429a4f27d7a4467f6b3f3 b3e5cd3c-a05a-11ec-abdb-00155dcfd717 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=154440 https://www.mdpi.com/1996-1944/14/6/1569 1 22428f21-c1fd-11eb-a523-00155dcfd717 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=143568 Fakulteta za gradbeništvo in geodezijo 0 0 0