20.500.12556/DiRROS-15854 The deformation of alkali-activated materials at an early age under different curing conditions The production of alkali-activated materials (AAMs) is known for its environmentally friendly processing method, where several amorphous-rich aluminosilicate material sources combine with an alkali media solution to form solid, ceramic-like materials. In terms of the Si:Al, Na(K):Al, and Na(K):H2O ratios, the theory of AAM formation is quite well developed, but some open questions in the technology process remain, especially with regards to the means of curing, where the generation of defects can be persistent. Knowing that deformation is extremely high in the early ages, this study investigates the effects of temperature and moisture on shrinkage behavior within the first 72 h of AA pastes made from ladle (LS) and electric arc furnace (EAF) slag and activated by sodium silicate (Na2SiO3). The method to determine the deformation of alkali-activated slag-based materials, in terms of both autogenous and drying shrinkage, was based on the modified ASTM C1698-19 standard for the measurement of autogenous shrinkage in cement pastes. Autogenous deformation and strain were measured in four samples, using the standard procedure at room temperature, 40 and 60°C. Furthermore, using an adjusted method, nine samples were characterized for strain and partial surface pressure, while drying at room temperature, 40, or 60°C at a relative humidity of 30 or 90%. The results show that the highest rate of autogenous shrinkage occurred at a temperature of 60°C, followed by drying shrinkage at 60°C and 30% relative humidity, owing to the fact that the rate of evaporation was highest at this moisture content. The study aimed to provide guidance regarding selection of the optimal curing set in order to minimize deformations in slag-based alkali-activated materials. In the present case, curing at a temperature of around 40°C under lower moisture conditions for the first 24 h provided optimal mechanical properties for the slags investigated. The methodology might also be of use for other aluminosilicate sources such as metakaolin, fly ash, and mineral wool–based alkali-activated materials. alkali-activated materials slag drying autogenous shrinkage partial surface pressure curing deformation alkalijsko aktivirani materiali žlindra sušenje avtogeno krčenje delni površinski tlak nega deformacije true false true Frontiers Editorial Office Angleški jezik Slovenski jezik © 2021 Češnovar, Traven and Ducman. Neznano 2022-11-30 11:03:12 2023-07-03 09:54:00 2024-08-06 09:24:11 0000-00-00 00:00:00 2021 0 0 Nasl. z nasl. zaslona; Opis vira z dne 19. 5. 2021; str. 1-9 Vol. 9 Jun. 2021 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 2021-06-08 620.1/.2 2296-2646 10.3389/fchem.2021.694454 63784707 https://www.frontiersin.org/articles/10.3389/fchem.2021.694454/abstract Odprti dostop 1 d2a303d4-708d-11ed-a69a-001a4af901a5 https://dirros.openscience.si/Dokument.php?lang=slv&id=20971 RAZ_Cesnovar_Mark_2021.pdf RAZ_Cesnovar_Mark_2021.pdf 1 E9743956551A9AF26845CAE28B5D9657 4ea3d3ea111cb16f861e8f3ba9bd0f5724d93537cd9eccc2dcaffcb793437d14 8a841932-9892-11ed-b359-001a4af901a5 https://dirros.openscience.si/Dokument.php?lang=slv&id=21404 Zavod za gradbeništvo Slovenije 0 0 0