Ladle steel slag in activated systems for construction use
| Autor: | Diego Aponte, Susana Valls del Barrio, Oriol Soto Martín, Marilda Barra Bizinotto |
|---|---|
| Přispěvatelé: | Universitat Politècnica de Catalunya. Departament d'Enginyeria Civil i Ambiental, Universitat Politècnica de Catalunya. MATCAR - Materials de Construcció i Carreteres |
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Alkali-activated slag
Materials science lcsh:QE351-399.2 alkali-activated slag 0211 other engineering and technologies Sodium silicate Enginyeria civil::Materials i estructures [Àrees temàtiques de la UPC] Mechanical properties 02 engineering and technology mineralogical analysis mechanical properties ladle furnace slag chemistry.chemical_compound 021105 building & construction media_common.cataloged_instance waste European union Shrinkage Curing (chemistry) media_common Cement Ladle lcsh:Mineralogy Ladle furnace slag Mineralogical analysis Metallurgy Slag Geology Acer -- Reciclatge 021001 nanoscience & nanotechnology Geotechnical Engineering and Engineering Geology shrinkage chemistry Sodium hydroxide Waste visual_art Steel--Recycling visual_art.visual_art_medium Cementitious 0210 nano-technology |
| Zdroj: | Minerals Volume 10 Issue 8 Minerals, Vol 10, Iss 687, p 687 (2020) UPCommons. Portal del coneixement obert de la UPC Universitat Politècnica de Catalunya (UPC) |
| Popis: | The construction industry needs to reduce greenhouse gases, in which cement production is currently responsible for generating between 4% and 6% of the total CO2 released into the atmosphere. Similarly, many industries produce large amounts of solid waste, which often have low value-added applications or are directly taken to landfills, with consequent negative environmental impacts. One of these industries is the steel industry, which in 2016 generated 18.4 Mt of slag (melting and refining slag) among all European Union countries. In terms of refining steel slag (ladle or white slag), it is estimated that for each ton of steel, between 20 and 30 kg of slag is produced that is, in 2016, more than 700,000 tons of white slag were generated. It is also known that this material has cementitious properties and can be used as a precursor in alkaline activation processes. Depending on the concentrations used of the activating agent, a higher or lower mechanical performance of the developed materials can be obtained. This work studied the alkali activation of a ladle slag used to manufacture mortars, subjecting them to an initial curing of 24 h at different temperatures (20, 40, and 70 ° C). Sodium silicate and sodium hydroxide were used as activating agents, using percentages of Na2O between 5% and 10% to obtain an optimal dosage of the activator. The physical and mechanical properties of the mortars were evaluated at different ages of curing. In addition, monitoring was undertaken of linear shrinkage due to drying and the mineralogical changes due to activation and curing time. |
| Databáze: | OpenAIRE |
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