Optimizing the l/s ratio in geopolymers for the production of large-size elements with 3D printing technology / Joanna Marczyk, Celina Ziejewska, Kinga Pławecka, Agnieszka, Bąk, Michał Łach, Kinga ... więcej

Optimizing the l/s ratio in geopolymers for the production of large-size elements with 3D printing technology / Joanna Marczyk, Celina Ziejewska, Kinga Pławecka, Agnieszka, Bąk, Michał Łach, Kinga Korniejenko, Izabela Hager, Janusz Mikuła. Wei-Ting Lin, Marek Hebda // Materials [Dokument elektroniczny]. – 2022, Vol. 15, Iss. 9, Spec. Iss., 18 s. : fot., tab., wykr. – Tryb dostępu: https://www.mdpi.com/1996-1944/15/9/3362. – Oznaczenie ref./art.: 3362. – Bibliogr. 73 poz., Abstr. – Spec. Iss.: Geopolymers and Alkali-Activated Materials: Synthesis, Characterization, and Applications. – doi: 10.3390/ma15093362. – ISSN 1996-1944

Geopolymer concretes can be a viable alternative to conventional Portland cement-based materials. In their design, it is important to maintain an appropriate liquid-to-solid ratio (L/S), which affects ... więcej

Geopolymer concretes can be a viable alternative to conventional Portland cement-based materials. In their design, it is important to maintain an appropriate liquid-to-solid ratio (L/S), which affects several properties, such as the compressive strength, water absorption, and frost resistance. The objective of this paper is to analyze the influence of the fly-ash and metakaolin precursor types for three different L/S ratios: 0.30, 0.35, and 0.45. The results of the physical and mechanical properties, including the apparent density and compressive strength, as well the durability parameters, including frost resistance and water penetration depth, are presented in this paper. It was found that as the L/S ratio decreased, the average compressive strength increased for all materials. After freeze–thaw cycles, decreases in the compressive strength properties were observed for all types of materials—metakaolin- and fly ash-based—irrespective of the L/S ratio. Moreover, the frost resistance of geopolymers increased with the increase in the L/S ratio. The printability of the mixes was also verified in order to confirm the application of the developed materials to additive manufacturing processes.