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A platform for research: civil engineering, architecture and urbanism
Revalorization of poorly reactive sources by mechanochemical activation : An alternative approach for sustainable cementitious binders
The latest report from the Intergovernmental Panel on Climate Change made once again clear the urge to take immediate actions to reduce the emissions of carbon dioxide and other greenhouse gases. Among the UN Sustainable Development Goals (SDGs), Nr. 12 (“Ensure sustainable consumption and production of raw materials”) aims to improve the industrial sector and to ensure a high quality of life. Concrete is the second most used material after water and in its traditional form utilizes cement clinker, whose production contributes to 8-10% of the anthropogenic CO2 emissions. Among the strategies to diminish the CO2 footprint, use of supplementary cementitious materials (SCM) and alkali-activated materials (AAM) are currently considered the most efficient countermeasures. Within this framework, revalorization of poorly reactive sources by mechanochemical activation can contribute to the development of novel binders with decreased CO2 footprint that can be utilized as partial or full replacement of Portland cement in concrete. Natural clays, mine tailings and air-cooled blast furnace slags (ACBFS), were activated in this study. Their applicability to be used in concretes as SCMs or/and AAMs was assessed. Natural clays are a mixture of various phases, whose compositions depends on weathering conditions. Naturally, they do not possess sufficient chemical reactivity to be utilized as SCMs. Similar properties possess mine tailings generated after extraction of precious elements, and slags produced in blast furnaces of traditional steel plants. The present study aims to enhance the reactivity of these resources through mechanochemical activation (MCA) in a planetary ball mill. The process is considered a clean technology able to enhance the reactivity of crystalline materials without resorting to high processing temperatures or additional chemicals. MCA can induce amorphization, destroying the structure and breaking the bonds within the aluminosilicates and other minerals structure. The chosen parameters in the ball mill, ...
Revalorization of poorly reactive sources by mechanochemical activation : An alternative approach for sustainable cementitious binders
The latest report from the Intergovernmental Panel on Climate Change made once again clear the urge to take immediate actions to reduce the emissions of carbon dioxide and other greenhouse gases. Among the UN Sustainable Development Goals (SDGs), Nr. 12 (“Ensure sustainable consumption and production of raw materials”) aims to improve the industrial sector and to ensure a high quality of life. Concrete is the second most used material after water and in its traditional form utilizes cement clinker, whose production contributes to 8-10% of the anthropogenic CO2 emissions. Among the strategies to diminish the CO2 footprint, use of supplementary cementitious materials (SCM) and alkali-activated materials (AAM) are currently considered the most efficient countermeasures. Within this framework, revalorization of poorly reactive sources by mechanochemical activation can contribute to the development of novel binders with decreased CO2 footprint that can be utilized as partial or full replacement of Portland cement in concrete. Natural clays, mine tailings and air-cooled blast furnace slags (ACBFS), were activated in this study. Their applicability to be used in concretes as SCMs or/and AAMs was assessed. Natural clays are a mixture of various phases, whose compositions depends on weathering conditions. Naturally, they do not possess sufficient chemical reactivity to be utilized as SCMs. Similar properties possess mine tailings generated after extraction of precious elements, and slags produced in blast furnaces of traditional steel plants. The present study aims to enhance the reactivity of these resources through mechanochemical activation (MCA) in a planetary ball mill. The process is considered a clean technology able to enhance the reactivity of crystalline materials without resorting to high processing temperatures or additional chemicals. MCA can induce amorphization, destroying the structure and breaking the bonds within the aluminosilicates and other minerals structure. The chosen parameters in the ball mill, ...
Revalorization of poorly reactive sources by mechanochemical activation : An alternative approach for sustainable cementitious binders
Tole, Ilda (author)
2022-01-01
Doctoral thesis / Luleå University of Technology 1 jan 1997 → …, 1402-1544
Theses
Electronic Resource
English
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