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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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In recent years, the implementation of sustainable concrete systems has been a topic of great interest in the field of construction engineering worldwide, as a result of the large and rapid increase in carbon emissions and environmental problems resulting from traditional concrete production and industry. For example, the uses of supplementary cementitious materials, geopolymer binder, recycled aggregate and industrial/agricultural wastes in concrete are all approaches to building a sustainable concrete system. However, such materials have inherent flaws due to their variety of sources, and exhibit very different properties compared with traditional concrete. Therefore, they require specific modifications in preprocessing, design, and evaluation before use in concrete. This reprint, entitled “Advances in Sustainable Concrete System”, covers a broad range of advanced concrete research in environmentally friendly concretes, cost-effective admixtures, and waste recycling, specifically including the design methods, mechanical properties, durability, microstructure, various models, hydration mechanisms, and practical applications of solid wastes in concrete systems.

Technology: general issues --- History of engineering & technology --- Conservation of buildings & building materials --- high-strength concrete --- energy evolution --- elastic strain energy --- brittleness evaluation index --- concrete --- humidity --- moisture absorption --- moisture desorption --- numerical simulation --- acoustic emission --- AE rate process theory --- corrosion rate --- damage evolution --- axial load --- precast concrete structure --- lattice girder semi-precast slabs --- bending resistance --- FE modelling --- concrete damage --- GSP --- high strength --- hydration --- strength --- penetrability --- rice husk ash --- sustainable concrete --- artificial neural networks --- multiple linear regression --- eco-friendly concrete --- green concrete --- sustainable development --- artificial intelligence --- data science --- machine learning --- bagasse ash --- mechanical properties --- natural coarse aggregate --- recycled coarse aggregate --- two-stage concrete --- materials design --- recycled concrete --- crumb rubber concrete --- crumb rubber --- NaOH treatment --- lime treatment --- water treatment --- detergent treatment --- compressive strength --- materials --- adhesively-bonded joint --- temperature aging --- residual strength --- mechanical behavior --- failure criterion --- steel slag powder --- compound activator --- mortar strength --- orthogonal experiment --- GM (0, N) model --- ultrafine metakaolin --- silica fume --- durability --- fiber-reinforced concrete --- damage mechanism --- uniaxial tension --- cracked concrete --- crack width --- crack depth --- tortuosity --- sustainability --- concrete composites --- sulfate and acid attacks --- WPFT fibers --- coal gangue --- gradation --- cement content --- unconfined compressive strength --- freeze-thaw cycle --- minimum energy dissipation principle --- three-shear energy yield criterion --- damage variable --- constitutive model --- phosphorus slag --- limestone --- sulphate-corrosion resistance --- volume deformation --- blast furnace ferronickel slag --- alkali-activated material --- dosage of activator --- reactive powder concrete --- beam-column joint --- FE modeling --- crack --- cementitious gravel --- fly ash --- age --- optimal dosage --- bamboo --- sawdust --- pretreatment --- bio-based material --- mechanical property --- self-compacting concrete --- supplementary cementitious materials --- hydration mechanisms --- microstructure --- fresh properties --- synthetic polymer --- high temperature --- bentonite-free drilling fluid --- rheology --- filtration --- FRP reinforced concrete slab --- punching shear strength --- SHAP --- high-strength concrete --- energy evolution --- elastic strain energy --- brittleness evaluation index --- concrete --- humidity --- moisture absorption --- moisture desorption --- numerical simulation --- acoustic emission --- AE rate process theory --- corrosion rate --- damage evolution --- axial load --- precast concrete structure --- lattice girder semi-precast slabs --- bending resistance --- FE modelling --- concrete damage --- GSP --- high strength --- hydration --- strength --- penetrability --- rice husk ash --- sustainable concrete --- artificial neural networks --- multiple linear regression --- eco-friendly concrete --- green concrete --- sustainable development --- artificial intelligence --- data science --- machine learning --- bagasse ash --- mechanical properties --- natural coarse aggregate --- recycled coarse aggregate --- two-stage concrete --- materials design --- recycled concrete --- crumb rubber concrete --- crumb rubber --- NaOH treatment --- lime treatment --- water treatment --- detergent treatment --- compressive strength --- materials --- adhesively-bonded joint --- temperature aging --- residual strength --- mechanical behavior --- failure criterion --- steel slag powder --- compound activator --- mortar strength --- orthogonal experiment --- GM (0, N) model --- ultrafine metakaolin --- silica fume --- durability --- fiber-reinforced concrete --- damage mechanism --- uniaxial tension --- cracked concrete --- crack width --- crack depth --- tortuosity --- sustainability --- concrete composites --- sulfate and acid attacks --- WPFT fibers --- coal gangue --- gradation --- cement content --- unconfined compressive strength --- freeze-thaw cycle --- minimum energy dissipation principle --- three-shear energy yield criterion --- damage variable --- constitutive model --- phosphorus slag --- limestone --- sulphate-corrosion resistance --- volume deformation --- blast furnace ferronickel slag --- alkali-activated material --- dosage of activator --- reactive powder concrete --- beam-column joint --- FE modeling --- crack --- cementitious gravel --- fly ash --- age --- optimal dosage --- bamboo --- sawdust --- pretreatment --- bio-based material --- mechanical property --- self-compacting concrete --- supplementary cementitious materials --- hydration mechanisms --- microstructure --- fresh properties --- synthetic polymer --- high temperature --- bentonite-free drilling fluid --- rheology --- filtration --- FRP reinforced concrete slab --- punching shear strength --- SHAP

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• Reference Manager
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In recent years, the implementation of sustainable concrete systems has been a topic of great interest in the field of construction engineering worldwide, as a result of the large and rapid increase in carbon emissions and environmental problems resulting from traditional concrete production and industry. For example, the uses of supplementary cementitious materials, geopolymer binder, recycled aggregate and industrial/agricultural wastes in concrete are all approaches to building a sustainable concrete system. However, such materials have inherent flaws due to their variety of sources, and exhibit very different properties compared with traditional concrete. Therefore, they require specific modifications in preprocessing, design, and evaluation before use in concrete. This reprint, entitled “Advances in Sustainable Concrete System”, covers a broad range of advanced concrete research in environmentally friendly concretes, cost-effective admixtures, and waste recycling, specifically including the design methods, mechanical properties, durability, microstructure, various models, hydration mechanisms, and practical applications of solid wastes in concrete systems.

high-strength concrete --- energy evolution --- elastic strain energy --- brittleness evaluation index --- concrete --- humidity --- moisture absorption --- moisture desorption --- numerical simulation --- acoustic emission --- AE rate process theory --- corrosion rate --- damage evolution --- axial load --- precast concrete structure --- lattice girder semi-precast slabs --- bending resistance --- FE modelling --- concrete damage --- GSP --- high strength --- hydration --- strength --- penetrability --- rice husk ash --- sustainable concrete --- artificial neural networks --- multiple linear regression --- eco-friendly concrete --- green concrete --- sustainable development --- artificial intelligence --- data science --- machine learning --- bagasse ash --- mechanical properties --- natural coarse aggregate --- recycled coarse aggregate --- two-stage concrete --- materials design --- recycled concrete --- crumb rubber concrete --- crumb rubber --- NaOH treatment --- lime treatment --- water treatment --- detergent treatment --- compressive strength --- materials --- adhesively-bonded joint --- temperature aging --- residual strength --- mechanical behavior --- failure criterion --- steel slag powder --- compound activator --- mortar strength --- orthogonal experiment --- GM (0, N) model --- ultrafine metakaolin --- silica fume --- durability --- fiber-reinforced concrete --- damage mechanism --- uniaxial tension --- cracked concrete --- crack width --- crack depth --- tortuosity --- sustainability --- concrete composites --- sulfate and acid attacks --- WPFT fibers --- coal gangue --- gradation --- cement content --- unconfined compressive strength --- freeze–thaw cycle --- minimum energy dissipation principle --- three-shear energy yield criterion --- damage variable --- constitutive model --- phosphorus slag --- limestone --- sulphate-corrosion resistance --- volume deformation --- blast furnace ferronickel slag --- alkali-activated material --- dosage of activator --- reactive powder concrete --- beam-column joint --- FE modeling --- crack --- cementitious gravel --- fly ash --- age --- optimal dosage --- bamboo --- sawdust --- pretreatment --- bio-based material --- mechanical property --- self-compacting concrete --- supplementary cementitious materials --- hydration mechanisms --- microstructure --- fresh properties --- synthetic polymer --- high temperature --- bentonite-free drilling fluid --- rheology --- filtration --- FRP reinforced concrete slab --- punching shear strength --- SHAP --- n/a --- freeze-thaw cycle