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The focus of this Special Issue was on biomass ash valorization with respect to their potential for various material applications. Most of the publications in this Special Issue focused on the production of biogenic silica with different properties. Additionally, some of the publications considered application of biomass ashes and biochar as a fertilizer, for soil amendment and recovery of ash forming elements such as N and P, as well as the application of biomass feedstocks in biofuel production.Accordingly, ashes produced from the thermochemical conversion of agricultural residues have high potential to be utilized for different material applications. However, local availability, as well as scaling up the process and life-cycle assessment should be considered prior to the utilization of these materials. Furthermore, densification as a mechanical pre-treatment can be crucial to improve the fuel properties, while purification of some of the ash forming elements, such as calcium, potassium, and prosperous should also not be disregarded in future investigations.

rice husk --- rice husk ash --- silica --- engineered particle --- bottom-up process --- silica extraction --- valorization --- agricultural byproduct --- sustainable material --- biomass --- renewable material --- biogenic amorphous silica --- green chemistry --- maize leaves --- sugarcane fiber --- sugarcane leaves --- sugarcane pith --- biorefinery --- multi-objectives RSM --- nano-silica --- de-ashing --- cellulose crystals --- carbon nanotubes --- cellulose --- sugarcane bagasse --- capacitance --- maize straw --- acid leaching --- ash --- pyrolysis --- nitrogen conversion --- wood ash --- fertilizer --- heat and power plants --- heavy metals --- nutrients --- German fertilizer legislation --- alkaline leaching --- continuous process --- bio-based material --- waste --- exhausted grape marc --- biochar --- soil amendment --- biogas --- lifecycle assessment --- greenhouse gas emissions --- mitigation potential --- GHG mitigation costs --- manure --- biomethane --- RED II --- EU ETS --- smoldering --- high moisture content --- specific surface area --- rice straw --- nanosilica --- methylene blue --- zero waste generation --- decolorization --- SDGs --- municipal sewage sludge --- energy recovery --- phosphorus recovery --- techno-economic analysis --- mono-combustion --- co-combustion --- n/a

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The articles featured in this Special Issue cover different aspects of the design, testing, and application of various types of supplementary cementitious materials in concrete. The results of the research, conducted by over 50 international universities and scientific centers, prove the great interest in the SCM topic.

crystalline admixture --- chemical exposure --- sulphuric acid attack --- durability --- Xypex --- fly ash --- substitution strategy --- structural concrete --- steel reinforcement --- limit states --- RC beams in bending --- carbon footprint --- concrete --- carbonation modeling --- calcareous fly ash --- biomass --- wood ash --- fibrocement --- strength --- mortar --- clean coal combustion --- fluidized bed fly ash --- microstructure --- phase composition --- portlandite --- unburned carbon --- slag --- soil stabilization --- embankment --- cement --- lime --- high temperature --- damage --- permeability --- CEMI and CEMIII --- mechanical properties --- alkali-activated concrete --- geopolymer concrete --- flexure --- beams --- fiber-reinforced concrete --- crack spacing --- tension stiffening --- bamboo ash --- supplementary materials --- elevated temperature --- high volume fly ash (HVFA) --- steel reinforcing fiber --- jacketing --- environmental impact --- fibre reinforced --- alkali-activated --- strain hardening --- recycled cementitious supplementary material --- comprehensive concrete recycling --- recycled fine fraction --- rehydration reactivity --- compressive strength --- ground granulated blast furnace slag --- apparent activation energy --- equivalent age --- construction debris --- recycling --- circular economy --- eco-friendly concretes --- fly ash (FA) --- silica fume (SF) --- palm oil fuel ash (POFA) --- rice husk ash (RHA) --- sewage sludge ash (SSA) and sugarcane bagasse ash (SBA) --- mine tailings --- marble dust --- construction and demolition debris (CDD) --- porous feldspar --- activation --- substitute material --- energy saving concrete --- calcined clay --- binder --- supplementary cementitious materials --- cement-based materials --- steatite --- wood particles --- Portland cement --- fire performance --- tensile strength --- micro-silica/silica fume --- steel fiber --- high performance concrete (HPC) --- self-consolidating concrete (SCC) --- flowability --- freeze-thaw cycle --- fire resistance --- bentonite --- clays --- cryogenic condition --- GGBS --- thermal conductivity --- semi-adiabatic test --- n/a --- Technology.