Title:
A Novel Clinker-Free Binary Paste with Biomass Fly Ash and Slag
Author(s):
Xuhui Liang, Guang Ye
Publication:
Symposium Paper
Volume:
362
Issue:
Appears on pages(s):
499-506
Keywords:
biomass fly ash, clinker-free binder, waste valorization
DOI:
10.14359/51741006
Date:
6/14/2024
Abstract:
Biomass fly ash is one of the primary by-products in the biomass energy industry. Lack of proper management has resulted in the direct disposal and landfilling of biomass fly ash, resulting in secondary pollution. Owing to its high alkalinity and sulfate content, it is possible to use biomass fly ash as a solid activator to react with aluminosilicate-rich precursors. In this paper, we formulate a binary binder that contains 50% of biomass fly ash and 50% of slag by weight, without including cement clinker or chemicals. The main hydration products of the binary binder are ettringite and C-A-S-H gels. The pastes exhibited a moderate compressive strength of 27.3 MPa with a water-to-binder ratio (w/b) of 0.4 at 28 days. The strength can be further improved to 45.8 MPa at 28 days, by reducing the w/s ratio to 0.25 with superplasticizers. The formulation of a clinker-free binder with a high proportion of biomass fly ash can be a sustainable strategy for biomass fly ash valorization.
Related References:
1. IEA, CO2 Emissions in 2022, Paris, 2023. https://www.iea.org/news/global-co2-emissions-rebounded-to-their-highest-level-in-history-in-2021.
2. IEA Bioenergy, How bioenergy contributes to a sustainable future, 2023.
3. IEA Bioenergy, Is energy from woody biomass positive for the climate?, 2018. https://www.ieabioenergy.com/wp-content/uploads/2018/01/FAQ_WoodyBiomass-Climate_final-1.pdf.
4. Europe Beyond Coal, Overview: National coal phase-out announcements in Europe. Status January 2021, (2021) 1–7. https://beyond-coal.eu/wpcontent/uploads/2021/01/Overview-of-national-coal-phase-out-announcements-Europe-Beyond-Coal-January-2021.pdf.
5. C. Maschowski, P. Kruspan, A.T. Arif, P. Garra, G. Trouvé, R. Gieré, Use of biomass ash from different sources and processes in cement, J. Sustain. Cem. Mater. 9 (2020) 350–370. doi: 10.1080/21650373.2020.1764877
6. R. Rajamma, L. Senff, M.J. Ribeiro, J.A. Labrincha, R.J. Ball, G.C. Allen, V.M. Ferreira, Biomass fly ash effect on fresh and hardened state properties of cement based materials, Compos. Part B Eng. 77 (2015) 1–9. doi: 10.1016/j.compositesb.2015.03.019
7. M. Velay-Lizancos, M. Azenha, I. Martínez-Lage, P. Vázquez-Burgo, Addition of biomass ash in concrete: Effects on E-Modulus, electrical conductivity at early ages and their correlation, Constr. Build. Mater. 157 (2017) 1126–1132. doi: 10.1016/j.conbuildmat.2017.09.179
8. N.M. Sigvardsen, G.M. Kirkelund, P.E. Jensen, M.R. Geiker, L.M. Ottosen, Impact of production parameters on physiochemical characteristics of wood ash for possible utilisation in cement-based materials, Resour. Conserv. Recycl. 145 (2019) 230–240. doi: 10.1016/j.resconrec.2019.02.034.
9. I. Carević, M. Serdar, N. Štirmer, N. Ukrainczyk, Preliminary screening of wood biomass ashes for partial resources replacements in cementitious materials, J. Clean. Prod. 229 (2019) 1045–1064. doi: 10.1016/j.jclepro.2019.04.321
10. C1698-19, Standard Test Method for Autogenous Strain of Cement Paste and Mortar, ASTM. (2019). doi: 10.1520/C1698-19.
11. F. Puertas, A. Palomo, A. Fernández-Jiménez, J.D. Izquierdo, M.L. Granizo, Effect of superplasticisers on the behaviour and properties of alkaline cements, Adv. Cem. Res. 15 (2003) 23–28. doi: 10.1680/adcr.2003.15.1.23
12. M. Palacios, F. Puertas, Effect of superplasticizer and shrinkage-reducing admixtures on alkali-activated slag pastes and mortars, Cem. Concr. Res. 35 (2005) 1358–1367. doi: 10.1016/j.cemconres.2004.10.014
13. Z. Li, S. Zhang, Y. Zuo, W. Chen, G. Ye, Chemical deformation of metakaolin based geopolymer, Cem. Concr. Res. 120 (2019) 108–118.
doi: 10.1016/j.cemconres.2019.03.017
14. P.K. Mehta, Mechanism of expansion associated with ettringite formation, Cem. Concr. Res. 3 (1973) 1–6. doi: 10.1016/0008-8846(73)90056-2