Project detail

Towards the organic admixtures tailoring for alkali-activated slag-based systems

Duration: 01.01.2020 — 31.12.2022

Funding resources

Czech Science Foundation - Standardní projekty

- whole funder

On the project

Jedním z palčivých problémů na poli alkalicky aktivovaných materiálů je, že pokusy zlepšit jejich vlastnosti konvenčními organickými přísadami obvykle končí neúspěšně. Navíc mohou tyto přísady již od samého počátku výrazně ovlivňovat hydratační proces. Klíčem k vyřešení těchto problémů je zevrubné pochopení interakcí mezi organickými molekulami a alkalicky aktivovaným systémem, zejména v prvních minutách a hodinách hydratace. Toto bude zkoumáno především v souvislostech mezi reologickými vlastnostmi, povrchovou chemií, složením pórového roztoku a hydratací alkalicky aktivované strusky, a to v závislosti na povaze aktivátoru a struktuře organických přísad. Závěrem bude chování směsí s vybranou přísadou porovnáno s chováním analogických směsí na bázi dalších alkalicky aktivovaných materiálů i portlandského cementu. Získané poznatky mohou být dále uplatněny např. pro šití organických přísad na míru alkalicky aktivovaným materiálům nebo pro aplikace, kde je velmi důležitá reologie (3D tisk atd.).

Description in English
One of the delicate issues in the field of alkali-activated materials is that attempts to improve their properties by conventional organic additives usually fail. Moreover, such admixtures can strongly modify the hydration process even at very early stages. The key to solve these issues is comprehensive understanding of the interactions between organic molecules and alkali-activated system, particularly during the first minutes and hours after mixing. This will be investigated especially in terms of the relationships between rheological properties, surface chemistry, pore solution composition and hydration in alkali-activated slag systems depending on the nature of activator and structure of organic admixtures. The selected well-described mixtures will be compared to analogous ones of other alkali activated systems and Portland cement. The obtained knowledge can be further used e.g. for the tailoring of organic admixtures for alkali-activated materials as well as for the applications where rheology is of high importance (3D printing etc.).

Keywords
Alkalicky aktivovaná struska, organické přísady, povrchová chemie, reologie, hydratace, stabilita

Key words in English
Alkali-activated slag, organic admixtures, surface chemistry, rheology, hydration, stability

Default language

Czech

People responsible

Hrubý Petr, Ing., Ph.D. - fellow researcher
Kalina Lukáš, doc. Ing., Ph.D. - fellow researcher
Kalina Michal, Ing., Ph.D. - fellow researcher
Ptáček Petr, prof. Ing., Ph.D. - fellow researcher
Smilek Jiří, Ing., Ph.D. - fellow researcher
Bílek Vlastimil, Ing., Ph.D. - principal person responsible

Units

Materials Research Centre
- beneficiary (2019-04-01 - not assigned)

Results

ILIUSHCHENKO, V.; BÍLEK, V.; KALINA, L.; HRUBÝ, P.; OPRAVIL, T.; BOJANOVSKÝ, J. Effect of alkali cation type on the plasticizing effect of ligno-sulfonate in alkali-activated systems. In IOP Conference Series: Materials Science and Engineering. IOP Conference Series: Materials Science and Engineering. Bristol: IOP Publishing, 2021. p. 1-7. ISSN: 1757-8981.
Detail

BÍLEK, V.; HRUBÝ, P.; ILIUSHCHENKO, V.; KOPLÍK, J.; KŘIKALA, J.; MARKO, M.; HAJZLER, J.; KALINA, L. Experimental Study of Slag Changes during the Very Early Stages of Its Alkaline Activation. Materials, 2021, vol. 15, no. 1, p. 1-21. ISSN: 1996-1944.
Detail

BÍLEK, V.; ILIUSHCHENKO, V.; HRUBÝ, P.; KALINA, L. Effectiveness of common water-reducing admixtures in alkali-activated slag pastes with different types of activator. In International Conference Building Materials, Products and Technologies (ICBMPT 2021). IOP Conference Series: Materials Science and Engineering. IOP Publishing, 2021. p. 1-7. ISSN: 1757-8981.
Detail

KALINA, M.; HRUBÝ, P.; SMILEK, J.; KALINA, L.; BÍLEK, V. Ligth Scattering Techniques as a key in Providing Insights into the Interactions and Stability of Alkali-activated Materials Based on Blast Furfance Slag. In Proceedings 13th International Conference on Nanomaterials - Research & Application. Proceedings 12th International Conference on Nanomaterials - Research & Application. 1. Brno: TANGER Ltd., 2021. p. 417-423. ISBN: 978-80-88365-00-6. ISSN: 2694-930X.
Detail

KALINA, L.; BÍLEK, V.; HRUBÝ, P.; ILIUSHCHENKO, V.; KALINA, M.; SMILEK, J. On the action mechanism of lignosulfonate plasticizer in alkali-activated slag-based system. Cement and Concrete Research, 2022, vol. 157, no. 0, p. 1-12. ISSN: 0008-8846.
Detail

BÍLEK, V.; KALINA, L.; NOVOTNÝ, R. Structural build-up and breakdown of alkali-activated slag pastes with different order of lignosulfonate and activator addition. Construction and building materials, 2023, vol. 386, no. červenec, p. 131557 ( p.)ISSN: 0950-0618.
Detail

BÍLEK, V.; KADLEC, M.; NOVOTNÝ, R.; KALINA, L.; HRUBÝ, P. Novel perspective to explain the retarding effect of organic admixtures in silicate-activated slag. In SP-354: Superplasticizers and Other Chemical Admixtures in Concrete - Conference Proceedings. Publication SP - American Concrete Institute. Milán: American Concrete Institute, 2022. p. 49-60. ISBN: 978-1-64195-185-2. ISSN: 0193-2527.
Detail

HRUBÝ, P.; BÍLEK, V.; ILIUSHCHENKO, V.; KALINA, L. Dependence of Lignosulfonate Plasticizer Efficiency on the Activator Concentration in Alkali-Activated Blast Furnace Slag Paste. In International Conference Binders and Materials. Solid State Phenomena. 2022. p. 88-95. ISSN: 1662-9779.
Detail

BÍLEK, V.; PAZOUR, M. Structural build-up and breakdown of sodium hydroxide-activated slag paste assessed using oscillatory rheology. In 25th International Conference Building Materials, Products and Technologies, ICBMPT 2022. Journal of Physics: Conference Series. 2022. ISSN: 1742-6588.
Detail

BÍLEK, V.; KALINA, L.; DVOŘÁK, R.; NOVOTNÝ, R.; ŠVEC, J.; MÁSILKO, J.; ŠOUKAL, F. Correlating Hydration of Alkali-Activated Slag Modified by Organic Additives to the Evolution of Its Properties. Materials, 2023, vol. 16, no. 5, p. 1-18. ISSN: 1996-1944.
Detail

BÍLEK, V.; NOVOTNÝ, R.; KOPLÍK, J.; KADLEC, M.; KALINA, L. Philosophy of rational mixture proportioning of alkali-activated materials validated by the hydration kinetics of alkali-activated slag and its microstructure. Cement and Concrete Research, 2023, vol. 168, no. 107139, ISSN: 0008-8846.
Detail

BÍLEK, V.; KALINA, L.; MARKUSÍK, D. Fresh Properties of Alkali-Activated Slag Pastes with Sodium and Potassium Hydroxide. In SP-355: Recent Advances in Concrete Technology and Sustainability Issues. Publication SP - American Concrete Institute. Milán: American Concrete Institute, 2022. p. 19-28. ISBN: 978-1-64195-184-5. ISSN: 0193-2527.
Detail

Responsibility: Bílek Vlastimil, Ing., Ph.D.