Multi-technique characterization of a fine fraction of CDW and assessment of reactivity in a CDW/lime system
Entity
UAM. Departamento de Geología y GeoquímicaPublisher
MDPIDate
2020-06-30Citation
10.3390/min10070590
Minerals 10.7 (2020): 590
ISSN
2075-163X (online)DOI
10.3390/min10070590Funded by
This research was funded by Spain’s Ministry of Science, Innovation and Universities under National Project RTI2018-097074-B-C21, the EU’s ERDF, the Spanish National Research Agency (AEI), the Spanish Construction and Demolition Waste Recycling Association (RCDA), Sika (Madrid, Spain) and the Spanish Institute of Cement and its Applications (IECA)Project
Gobierno de España. RTI2018-097074-B-C21Editor's Version
https://doi.org/10.3390/min10070590Subjects
Concrete-based CDW; Fine particle waste; Hydrated phases; Mineralogy; Pozzolanicity; GeologíaRights
© 2020 by the authorsAbstract
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
Files in this item
Google Scholar:Frías, Moisés
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de la Villa, Raquel Vigil
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Martínez-Ramírez, Sagrario
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Fernández-Carrasco, Lucía
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Villar-Cociña, Ernesto
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García Giménez, Rosario
This item appears in the following Collection(s)
- Producción científica de la UAM [20792]
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