| Title |
Papildomosios cementinės medžiagos iš biomasės lakiųjų pelenų sintezė ir savybės |
| Translation of Title |
Synthesis and properties of supplementary cementitious materials from biomass fly ash. |
| Authors |
Gaivenis, Motiejus |
| Full Text |
|
| Pages |
75 |
| Keywords [eng] |
biomass fly ash ; hydration ; hardening ; Portland cement ; hydrothermal treatment |
| Abstract [eng] |
This study aimed to investigate the potential of using biomass fly ash as a supplementary cement material after hydrothermal modification. The treatment of biomass fly ash involved additional grinding and synthesis under various hydrothermal conditions. The variation in the C/S ratio was achieved by mixing different biomass fly ash samples. Samples with C/S ratios of 1 and 1.5 were selected for synthesis. Additionally, cement samples with different amounts of the synthesized additive were examined. The following methods were used in the study: XRD, XRF, ICP-OES, DSC-TG and isothermal calorimetry. It was found that calcium silicate hydrates formed in all biomass fly ash samples after just 2 hours of hydrothermal synthesis at a temperature of 200 °C. The chemical composition analysis of the liquid medium after hydrothermal treatment revealed an exceptionally low content of heavy metals released from the samples. The synthetic additive accelerated the initial hydration of Portland cement. The results of the compressive strength tests suggest that 5–10 % of the cement mass can be replaced with hydrothermally treated biomass fly ash without reducing the compressive strength class of Portland cement samples. |
| Dissertation Institution |
Kauno technologijos universitetas. |
| Type |
Master thesis |
| Language |
Lithuanian |
| Publication date |
2025 |
