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The amount of slag generated is almost athird of the total stainless steel produced. Owing to its mineralogy, a large partof the slag is produced as fines, which has a very low valorisation potentialand has to be landfilled. The present work is aimed at exploring the potentialof these slags to produce construction materials of higher economic value.To address the issue, two valorisationroutes were applied: 1) alkali-activation initiating binding reactions in theslag by the addition of alkali hydroxides and silicates, 2) carbonation initiating hardening reaction in the slag by the formation of alkalicarbonates. Two stainless steel slags, continuous casting (CtCs) slag and Argonoxygen decarburisation (AOD) slag, were targeted for valorisation.Initiation of hardening reactions in theslag was found to occur only under a combined treatment of alkali (Na and K)hydroxides and high temperature (80 °C) which was provided by steam curing. However,only a moderate strength in the mortar specimens was observed under suchconditions along with appearance of efflorescence with NaOH for molaritiesabove 5 M. The problem of low strength and efflorescence in the mortar sampleswas eliminated by the introduction of silicates in the system along with thealkali hydroxides. The compressive strength of the slag mortars was found toincrease with the increase in the amount of silicates in the activatingsolution and with the increase of the curing temperature. The reaction productfrom the activation was found to be C-S-H as confirmed by thermogravimetric,QXRD, FTIR and 29Si NMR analysis.The slag was also found to develop strengthunder acceleration carbonation conditions which was provided under two environments:i) in a carbonation chamber, maintained at atmospheric pressure, 22 °C, 5 vol.%CO2 and 80% RH; and ii) in a carbonation reactor, where the CO2partial pressure (pCO2)and temperature could be further increased. It was found that in thecarbonation chamber the compressive strength of the samples and the CO2sequestration continued to increase up to 3 weeks whereas in the reactor theoptimum for strength and CO2 sequestration was found at 80 °C, 8 barpressure in 2.5 h. The major reaction product was found to be calcite indifferent morphologies.Three types of masonry blocks were preparedform the slag with the two valorisation routes: alkali-activated solid bricks,perforated carbonated bricks and alkali-activated aerated bricks. Thecarbonated bricks were found to have the best resistance to freeze-thaw,whereas the aerated bricks were found to have superior thermal resistivity values.The LCA showed that the environmental impact of the bricks is lower (negativefor carbonated bricks) than the conventional clay fired bricks and the impactof the aerated bricks was found to be similar to the conventional aeratedblocks available in the market. A SWOTanalysis highlighted the advantage of using these bricks in the form of lowerenergy requirement in its production, reduction of stress on the use of prime materialsand ease of metal recovery from the residual slag.The results of the dissertation show that thebinding potential of the stainless steel slags can be exploited as valorisedapplications in the construction industry by novel thermo-alkali activation andcarbonation processes.

691 --- Academic collection --- 691.714 --- 691.504 --- Building materials. Building components --- Steel --- Building materials and the environment. Sustainable building materials --- Theses --- 691.504 Building materials and the environment. Sustainable building materials --- 691.714 Steel --- 691 Building materials. Building components

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Authored by top researchers in their respective fields, this book discusses methodologies to quantify the properties and microstructures of aluminum, steel, and superalloys. Some of the topics discussed include metallography, an atlas of microstructures, thermal analysis, x-ray diffraction, and residual stress measurement, transmission electron microscopy (TEM), electron backscattering diffraction spectroscopy, texture measurement, electron momentum spectroscopy, positron annihilation spectroscopy, and atomic probe tomography. Analytical Characterization of Aluminum, Steel, and Superalloys offers engineers and materials scientists a unique reference of many advanced laboratory techniques in the context of characterization and property evaluation methodologies, enabling the evolution of stronger and more function-specific compositions.

Aluminum --- Heat resistant alloys --- Steel --- Analysis. --- 669.71 --- 691.714 --- 691.714 Steel --- 669.71 Aluminium --- Aluminium --- Iron --- High temperature metals --- Refractory metals --- Superalloys --- Alloys --- Heat resistant materials --- Analysis

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Building, Iron and steel --- 624.014.2 --- Staalconstructies : corrosie --- 691.714 --- 693.814 --- Staalconstructies : portalen --- Staalconstructies : stabilisatie --- Staalconstructies : tekenvoorschriften --- Staalconstructies : vakwerken --- Architectural engineering --- Engineering, Architectural --- Iron and steel building --- Iron construction --- Steel and iron building --- Steel construction --- Girders --- Graphic statics --- Iron --- Steel --- Iron, Structural --- Steel, Structural --- Structural steelwork --- 693.814 Structural steelwork --- 691.714 Steel

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Building materials. Building technology --- steel frame construction --- Architecture --- constructies --- Building design --- staalbouw --- ontwerpen --- #KVIV --- 693 --- Staalbouw ; naslagwerken --- 693.8 --- 691.714 --- staalconstructie --- Bricklaying and related building crafts --- Staalconstructies. Metaalconstructies --- Structural work in steel and other metals --- Steel --- (zie ook: stalen constructie) --- 691.714 Steel --- 693.8 Structural work in steel and other metals --- 693 Bricklaying and related building crafts --- Building, Iron and steel. --- Steel, Structural. --- Tall buildings. --- 691.7 --- 691 --- Staal --- Staalconstructies --- Bouwmaterialen (architectuur)

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Building, Iron and steel --- Steel, Structural --- Congresses. --- -Steel, Structural --- -691.7 --- 691.714 --- 624.014 --- 624.014.2 --- Structural steel --- Building materials --- Civil engineering --- Girders --- Iron and steel bridges --- Iron, Structural --- Structural steel industry --- Architectural engineering --- Engineering, Architectural --- Iron and steel building --- Iron construction --- Steel and iron building --- Steel construction --- Graphic statics --- Iron --- Steel --- Congresses --- Metallic building materials --- Metal structures --- Steel structures --- 624.014.2 Steel structures --- 624.014 Metal structures --- 691.714 Steel --- 691.7 Metallic building materials --- 691.7