The combined effect of gum arabic and casein on selected parameters of lime-metakaolin paste and hemp concrete for use as wall material
Artykuł w czasopiśmie
MNiSW
140
Lista 2024
| Status: | |
| Autorzy: | Brzyski Przemysław, Cieślikiewicz Łukasz, Pietrak Karol, Łapka Piotr |
| Dyscypliny: | |
| Aby zobaczyć szczegóły należy się zalogować. | |
| Rok wydania: | 2026 |
| Wersja dokumentu: | Drukowana | Elektroniczna |
| Język: | angielski |
| Wolumen/Tom: | 123 |
| Numer artykułu: | 115824 |
| Strony: | 1 - 22 |
| Impact Factor: | 7,4 |
| Web of Science® Times Cited: | 0 |
| Scopus® Cytowania: | 0 |
| Bazy: | Web of Science | Scopus |
| Efekt badań statutowych | NIE |
| Finansowanie: | This work was supported by the National Science Centre (Poland) [Grant No: 2019/03/X/ST8/01950], by Polish Ministry of Education and Science within the grant number FD-20/IL-4/009 and the Faculty of Power and Aeronautical Engineering of Warsaw University of Technology (Poland) in the framework of statutory activity. |
| Materiał konferencyjny: | NIE |
| Publikacja OA: | NIE |
| Abstrakty: | angielski |
| Due to the low strength of lime-hemp composites used in walls and their high susceptibility to water absorption, it is advisable to develop methods to improve their performance. The proposed method of modification is to use modifiers in the form of biopolymers of various but natural origins. Lime-pozzolanic pastes modified with a mixture of organic polymers of plant (gum arabic) and animal (casein) origin were developed. Based on microstructure studies, the impact of bio-admixtures on the increase in porosity and pore size in the paste was demonstrated. SEM analysis showed a tight arrangement of calcite crystals after using the largest amounts of admixtures. Biopolymers caused an improvement in flexural strength and a reduction in the compressive strength of pastes. The developed pastes were used in a lime-hemp composite. It was shown that biopolymers noticeably improved the strength of composites. This could have been influenced by the adhesive properties, mainly casein, and the ability of polysaccharides to create a film and bonds tightening the binder particles. The hydrophobic properties of proteins and the water binding capacity of polysaccharides resulted in a limitation of the rate and height of capillary water uptake by the composite with the highest content of bio-admixtures. The addition of gum arabic and casein together slightly decreases thermal conductivity compared to the pure hemp-lime composite. Small dosages (1-2%) of both biopolymers resulted in a significant increase of the moisture sorption property, i.e., moisture uptake and hysteresis, but the result suggests that further increase of the dosage might lead to the disappearance of the observed enhancement due to competing influences of hydrophilic polysaccharides and hydrophobic proteins. The water vapor permeability of modified composites was roughly the same as that of non-modified reference samples and fell within the common literature range. This outcome suggested that permeability is primarily governed by the distribution of open capillaries between shives rather than binder modification. The research results provided promising opportunities for expanding the application of the developed bio-based mixtures due to improved mechanical properties and reduced water absorption without compromising vapor permeability and thermal conductivity. |
