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Open AccessArticle

Multi-Technique Characterization of a Fine Fraction of CDW and Assessment of Reactivity in a CDW/Lime System

1
Eduardo Torroja Institute for Construction Science (IETcc-CSIC), 28033 Madrid, Spain
2
Departamento de Geología y Geoquímica, Geomateriales Unidad Asociada CSIC-UAM, Universidad Autónoma de Madrid, 28049 Madrid, Spain
3
Institute for the Structure of Matter (IEM-CSIC), 28006 Madrid, Spain
4
Department of Civil and Environmental Engineering, Barcelona TECH, Universitat Politècnica de Catalunya, 08034 Barcelona, Spain
5
Department of Physics, Central University of Las Villas, Santa Clara 54830, Villa Clara, Cuba
*
Author to whom correspondence should be addressed.
Minerals 2020, 10(7), 590; https://doi.org/10.3390/min10070590 (registering DOI)
Received: 3 June 2020 / Revised: 18 June 2020 / Accepted: 29 June 2020 / Published: 30 June 2020
(This article belongs to the Special Issue Minerals and Other Phases in Constructional Geomaterials)
This study analysed the fine particle (<5 mm) waste generated during siliceous or calcareous (depending on the composition of the original aggregate) concrete waste crushing. In the absence of industrial applications, such waste is amassed in open-air stockpiles on construction and demolition wastes (CDW) management plant grounds. The aim pursued was to find an outlet for that material in the cement industry. The starting waste, sourced from six Spanish management facilities, was characterised for its chemical and mineralogical composition, physical properties and pozzolanicity. The mineralogical phases in the CDW/lime system and their variations during the pozzolanic reaction were likewise identified. The findings showed that the fine waste consisted primarily in quartz, calcite, micas and feldspars, with smaller fractions of kaolinite and cement anhydrous phases. No portland cement hydration phases were identified. All six types analysed exhibited medium to low pozzolanicity, with the highest values recorded for the siliceous waste. Ettringite, C–S–H gels and calcium aluminate hydrates (C4AH13, C4AcH12) were identified during the pozzolanic reaction in CDW/lime system. Therefore, this type of waste can be reused as supplementary cementitious material with low-medium pozzolanic activity. View Full-Text
Keywords: fine particle waste; concrete-based CDW; mineralogy; pozzolanicity; hydrated phases fine particle waste; concrete-based CDW; mineralogy; pozzolanicity; hydrated phases
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Frías, M.; Vigil de la Villa, R.; Martínez-Ramírez, S.; Fernández-Carrasco, L.; Villar-Cociña, E.; García-Giménez, R. Multi-Technique Characterization of a Fine Fraction of CDW and Assessment of Reactivity in a CDW/Lime System. Minerals 2020, 10, 590.

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