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Abstract
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| The development of alternatives to Portland cement obtained whose production emits less pollution and saves energy constitutes a priority line of research and one of enormous interest world-wide. Such alternative binders include the materials formed when alkaline solutions are mixed with industrial by-products such as blast furnace slag or fly ash. Alkali-activated cements and concretes are characterised by low heat of hydration, high mechanical strength and high resistance to aggressive chemicals and their preparation is less energy-intensive than Portland cement manufacture. These alkaline materials are strongest and most durable when the activator used is a member of a family of synthetic alkaline silicate hydrates collectively know as waterglass, whose processing, however, is costly and highly polluting. One way of improve the economic and ecological balance of alkaline cements would be to find (total or partial) substitutes for these alkaline activators. With a chemical composition consisting primarily of SiO2 (65-75%) and Na2O (12-15%), urban and industrial waste glass is a potential waterglass. The main objective of the present paper is to prepare new cementitious materials (binders) by alkali-activating industrial waste or by-products (industrial and urban glass and blast furnace slag) by studying the viability of the use of such waste glass as potential alkaline activators. The best dissolution conditions of the Si and Na from the waste glass has been established. Also from the highest mechanical strength values were obtained using NaOH/Na2CO3 as alkaline activator and with mechanochemical activation process. | |
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International
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Si |
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Congress
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4th International conference on engineering for waste and biomass valorisation |
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960 |
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Place
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Porto (Portugal) |
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Reviewers
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Si |
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ISBN/ISSN
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9791091526005 |
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Start Date
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02/09/2012 |
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End Date
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02/09/2012 |
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From page
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1 |
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To page
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1 |
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Proceedings Of The 4th International Conference On Engineering For Waste And Biomass Valorisation |