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Showing 1 to 20 of 29 for “"Alkali-activated"”.
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Characterisation and properties of alkali activated pozzolanic materials.
… research has concentrated on the alkali activation of waste pozzolanic materials, especially ground blast furnace slag. This thesis has investigated the alkali activation of low calcium fly ashes. These form very poor pozzolans and the alkali activation of the fly ash offers the …
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Valorization of boiler ash in alkali activated material
… materials. This is accomplished using alkali activation, a low energy approach which relies on a chemical reaction to give the product its strength. The aim is to create a mix design which is robust enough to account for the variability in the ash and which produces a high performing …
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Novel, inorganic composites using porous, alkali-activated, aluminosilicate binders
… material composed of alumina, silica, and alkali metal oxides. Geopolymers are chemical and fire resistant, can be used as refractory adhesives, and are processed at or near ambient temperature. These properties make geopolymer an attractive choice as a matrix material for elevated …
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Characterization and utilization of alkali-activated concrete for sustainable infrastructures
… locally available fly ashes (FAs) to synthesize alkali-activated concrete (AAC) for different structural and repair applications. Using AAC made of 100% FA reduces global CO2 emissions, saves energy, and decreases raw material consumption during the production process of ordinary Portland cement. …
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Porosity control of alkali-activated aluminosilicates via functional alkoxysilane additives
Geopolymers were synthesized with alkoxysilane and other organo-silane supplements to improve adhesion to organic polymers and to modify porosity. Uncured geopolymer slurry was found to be miscible with various alkoxysilanes, and the resulting cured geopolymer strongly adhered to organic polymers …
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Decreasing water absorption in and environmental analysis of alkali activated bricks
Alkali activated bricks offer an alternative to traditional clay fired bricks for use in construction in the developing world. Previous work in this lab focused on creating a robust mix formulation to create these bricks, but they faced high water absorption and were not optimized under pressure …
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Effect of carbonation on bound chlorides in cementitious and alkali activated binders
… contributes to 4% of the global CO2 emission. Alkali activation of aluminosilicate industry by-products, such as ground granulated blast furnace slag, fly ash or calcined clays, can provide a viable binder system that can contribute towards the cement market. Activators such as sodium hydroxide …
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Durability of alkali-activated calcined clay - GGBFS concrete against carbonation and chloride diffusion
… binders, called geopolymer, is obtained from the alkaline activation of raw materials rich in SiO₂ and Al₂O₃, which can be derived from by-products or industrial residues. Calcined clay has emerged as a potential candidate as a precursor for this type of material. Large amounts of suitable clays …
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Alkali-activated materials: Potential as alternative binders and use as extraterrestrial construction materials
Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2025-05-01
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Building nature conservation : masonry from alkali-activated industrial waste & the economics of ecosystem services
… into sustainable building materials through alkali-activation, we propose a solution to help alleviate the environmental, ecological, and human health impacts of India's housing crisis. Surge in material use leads not only to environmental impact from processing, manufacturing, and …
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Preparing Main Group Metal Clusters from Organoaluminium Reagents; New Possibilities in Alkali-Activated Polymer Crosslinking
The reactions of carboxylic acids with organoaluminium reagents were studied, which led to the formation of novel aluminium compounds. The reactions of orthofunctionalised derivatives of benzoic acid with trivalent aluminium organyls AlR3, led to the formation of different Al-based molecular …
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Crack Self-Healing in Alkali-Activated Materials: From Mechanisms to Strategies for Enhancing the Healing Efficiency
… global anthropogenic carbon dioxide emissions. Alkali-activated materials (AAMs) have emerged as promising alternative binders to curb carbon dioxide emissions from portland cement production and allow more sustainable construction. In addition, AAMs have desirable mechanical properties and high …
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Characterizations of concretes with alkali-activated binder and correlating their properties from micro- to specimen level
… and consumes significant amount of heat energy. Alkali-activated binder (AAB) is increasingly being considered as an environmentally friendly or green alternative to PC. The AAB is produced by alkali activation of aluminosilicate compounds as precursors with or without calcium ions in them in the …
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The performance of a blended PFA/GGBS alkali-activated concrete using a silica fume-based activator
… the academic and commercial space also known as alkali-activated concrete, bringing CO<sub>2</sub> reductions of up to 85%. AAC has been elevated as a viable solution detrimental to the ‘sustainable toolkit’ for low-carbon concrete solutions through the use of various industrial and agricultural …
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Alkali-activated materials and Geopolymers from wastes and secondary raw materials: innovative and sustainable building products
L'abstract è presente nell'allegato / the abstract is in the attachment
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Mix design, fresh and hardened properties and microstructural characterisation of alkali-activated concrete based on PFA/GGBS blends
Alkali-activated concrete (AAC) has recently emerged as a potential candidate to replace the conventional Portland cement concrete (PCC) in several applications due to its low CO2 footprint and promising mechanical properties. However, the robustness and the good reputation PCC has gained over the …
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Prospective retarders for alkali-activated slag: stability at high alkalinity, effects on setting behavior and strength of paste
… of ordinary Portland cements. Geopolymers or alkali-activated systems with precursors as fly ash, slag or metakaolin, or a mixture of these, are possible substitutes. There are several hindrances to their use in construction due to the lack of understanding and control of properties of the …
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Development of reinforced alkali activated materials for cultural heritage restoration [Sviluppo di geopolimeri compositi rinforzati per il restauro di beni culturali]
Questa tesi di dottorato è stata redatta nell'ambito del corso di dottorato in Scienze della Terra e dell'Ambiente dell'Università di Catania e verte sullo sviluppo di materiali rinforzati ad attivazione alcalina (MAA) per il restauro dei beni culturali. La ricerca mira a esplorare la produzione …
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Mechanical Properties and Environmental Performance of Calcium Carbide Residue-Based Materials in Soil Stabilisation
… CCR combined with fly ash (CCR-FA), and CCR-FA activated by a waste glass-derived alkaline activator. A series of microstructural analyses, isotropic consolidation, consolidated undrained, tank leaching, and wetting-drying cycle tests were conducted, and life cycle assessment was applied to …
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Aqueous reactivity of glassy industrial byproducts in alternative cementitious systems
Alkali-activated, geopolymeric, and other novel binders offer an opportunity to curb the carbon footprint associated with ordinary Portland cement (OPC). CO₂ emissions inherent to source-material processing (i.e., firing of limestone at 1450 °C) and annual OPC production volumes of 4.1 billion …
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