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BÍLEK, V. KALINA, L. DVOŘÁK, R. NOVOTNÝ, R. ŠVEC, J. MÁSILKO, J. ŠOUKAL, F.
Originální název
Correlating Hydration of Alkali-Activated Slag Modified by Organic Additives to the Evolution of Its Properties
Typ
článek v časopise ve Web of Science, Jimp
Jazyk
angličtina
Originální abstrakt
This study investigates the relationships between the hydration kinetics of waterglass-activated slag and the development of its physical-mechanical properties, as well as its color change. To modify the calorimetric response of alkali-activated slag, hexylene glycol was selected from various alcohols for in-depth experiments. In presence of hexylene glycol, the formation of initial reaction products was restricted to the slag surface, which drastically slowed down the further consumption of dissolved species and slag dissolution and consequently delayed the bulk hydration of the waterglass-activated slag by several days. This allowed to show that the corresponding calorimetric peak is directly related to the rapid evolution of the microstructure and physical-mechanical parameters and to the onset of a blue/green color change recorded as a time-lapse video. Workability loss was correlated with the first half of the second calorimetric peak, while the most rapid increase in strengths and autogenous shrinkage was related to the third calorimetric peak. Ultrasonic pulse velocity increased considerably during both the second and third calorimetric peak. Despite the modified morphology of the initial reaction products, the prolonged induction period, and the slightly reduced degree of hydration induced by hexylene glycol, the overall mechanism of alkaline activation remained unchanged in the long-term perspective. It was hypothesized that the main issue of the use of organic admixtures in alkali-activated systems is the destabilizing effect of these admixtures on soluble silicates introduced into the system with an activator.
Klíčová slova
alkali-activated slag; calorimetry; microstructure; retardation; pore solution; organic admixture; color change; shrinkage; setting
Autoři
BÍLEK, V.; KALINA, L.; DVOŘÁK, R.; NOVOTNÝ, R.; ŠVEC, J.; MÁSILKO, J.; ŠOUKAL, F.
Vydáno
25. 2. 2023
Nakladatel
MDPI
Místo
Basel, Switzerland
ISSN
1996-1944
Periodikum
Materials
Ročník
16
Číslo
5
Stát
Švýcarská konfederace
Strany od
1
Strany do
18
Strany počet
URL
https://www.mdpi.com/1996-1944/16/5/1908
Plný text v Digitální knihovně
http://hdl.handle.net/11012/209176
BibTex
@article{BUT183050, author="Vlastimil {Bílek} and Lukáš {Kalina} and Richard {Dvořák} and Radoslav {Novotný} and Jiří {Švec} and Jiří {Másilko} and František {Šoukal}", title="Correlating Hydration of Alkali-Activated Slag Modified by Organic Additives to the Evolution of Its Properties", journal="Materials", year="2023", volume="16", number="5", pages="18", doi="10.3390/ma16051908", issn="1996-1944", url="https://www.mdpi.com/1996-1944/16/5/1908" }