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Descripción
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| In 2012, 35% of the waste generated in Europe were construction and demolition waste (C&DW). In Spain, 54 % of C&DW is clay-based. Many studies have confirmed the viability of using clay-based waste as a sub-base in road construction [1], as well as a pozzolan in Portland cement manufacture [2] and as an alternative raw material in the preparation of cement raw mix [3-4]. Also this waste is routinely used as an aggregate in portland cement mortar and concrete [5]. Given the composition of this material, it favours concrete performance and durability, as substantiated by its compliance with national and international concrete specifications. Nonetheless, research on the use of this recycled aggregate to prepare alkaline cement mortars (AAMs) and concretes has yet to be forthcoming. The clay-based waste, composed primarily of Si and Al oxides, may potentially respond to alkaline activation. [6]. The present study aimed to determine the pozzolanicity of this material in OPC systems and the mechanical strength of mortars made with alkali-activated slag and fly ash, using variable proportions of clay-based aggregate. The effect of partial replacement of the slag and ash themselves with finely ground fractions of the waste was also explored. The main conclusions of the work and it?s most relevant contributions from the present study are: The Frattini test showed that clay-based waste (with a chemical composition based primarily on SiO2 and Al2O3) is highly pozzolanic; Nonetheless, it does not respond to alkaline activation, nor does it have a beneficial effect on strength when blended with vitreous blast furnace slag or fly ash; Such construction waste can viably replace up to 20 % of standard siliceous aggregate in OPC mortars. The performance of such recycled aggregate in alkaline cements depends on the nature of the aluminosilicate (slag or fly ash) and the replacement ratio. | |
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Internacional
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Si |
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Nombre congreso
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III International Congress on Construction and Building Research |
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Tipo de participación
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960 |
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Lugar del congreso
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Escuela Técnica Superior de Edificación (Universidad Politécnica de Madrid) |
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Revisores
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Si |
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ISBN o ISSN
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978-84-933567-6-7 |
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DOI
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Fecha inicio congreso
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14/12/2015 |
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Fecha fin congreso
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16/12/2015 |
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Desde la página
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153 |
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Hasta la página
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154 |
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Título de las actas
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BOOK OF EXTENDED ABSTRACTS III International Congress on Construction and Building Research |