Multi-Technique Characterization of a Fine Fraction of CDW and Assessment of Reactivity in a CDW/Lime System
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 was...
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| Format: | Article |
| Language: | English |
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MDPI AG
2020-06-01
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| Series: | Minerals |
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| Online Access: | https://www.mdpi.com/2075-163X/10/7/590 |
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| author | Moisés Frías Raquel Vigil de la Villa Sagrario Martínez-Ramírez Lucía Fernández-Carrasco Ernesto Villar-Cociña Rosario García-Giménez |
| author_facet | Moisés Frías Raquel Vigil de la Villa Sagrario Martínez-Ramírez Lucía Fernández-Carrasco Ernesto Villar-Cociña Rosario García-Giménez |
| author_sort | Moisés Frías |
| collection | DOAJ |
| description | 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 (C<sub>4</sub>AH<sub>13,</sub> C<sub>4</sub>AcH<sub>12</sub>) 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. |
| first_indexed | 2024-03-10T18:47:57Z |
| format | Article |
| id | doaj.art-f00b2ad5a1fd4c44ba09d22d1d4a7763 |
| institution | Directory Open Access Journal |
| issn | 2075-163X |
| language | English |
| last_indexed | 2024-03-10T18:47:57Z |
| publishDate | 2020-06-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Minerals |
| spelling | doaj.art-f00b2ad5a1fd4c44ba09d22d1d4a77632023-11-20T05:22:59ZengMDPI AGMinerals2075-163X2020-06-0110759010.3390/min10070590Multi-Technique Characterization of a Fine Fraction of CDW and Assessment of Reactivity in a CDW/Lime SystemMoisés Frías0Raquel Vigil de la Villa1Sagrario Martínez-Ramírez2Lucía Fernández-Carrasco3Ernesto Villar-Cociña4Rosario García-Giménez5Eduardo Torroja Institute for Construction Science (IETcc-CSIC), 28033 Madrid, SpainDepartamento de Geología y Geoquímica, Geomateriales Unidad Asociada CSIC-UAM, Universidad Autónoma de Madrid, 28049 Madrid, SpainInstitute for the Structure of Matter (IEM-CSIC), 28006 Madrid, SpainDepartment of Civil and Environmental Engineering, Barcelona TECH, Universitat Politècnica de Catalunya, 08034 Barcelona, SpainDepartment of Physics, Central University of Las Villas, Santa Clara 54830, Villa Clara, CubaDepartamento de Geología y Geoquímica, Geomateriales Unidad Asociada CSIC-UAM, Universidad Autónoma de Madrid, 28049 Madrid, SpainThis 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 (C<sub>4</sub>AH<sub>13,</sub> C<sub>4</sub>AcH<sub>12</sub>) 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.https://www.mdpi.com/2075-163X/10/7/590fine particle wasteconcrete-based CDWmineralogypozzolanicityhydrated phases |
| spellingShingle | Moisés Frías Raquel Vigil de la Villa Sagrario Martínez-Ramírez Lucía Fernández-Carrasco Ernesto Villar-Cociña Rosario García-Giménez Multi-Technique Characterization of a Fine Fraction of CDW and Assessment of Reactivity in a CDW/Lime System Minerals fine particle waste concrete-based CDW mineralogy pozzolanicity hydrated phases |
| title | Multi-Technique Characterization of a Fine Fraction of CDW and Assessment of Reactivity in a CDW/Lime System |
| title_full | Multi-Technique Characterization of a Fine Fraction of CDW and Assessment of Reactivity in a CDW/Lime System |
| title_fullStr | Multi-Technique Characterization of a Fine Fraction of CDW and Assessment of Reactivity in a CDW/Lime System |
| title_full_unstemmed | Multi-Technique Characterization of a Fine Fraction of CDW and Assessment of Reactivity in a CDW/Lime System |
| title_short | Multi-Technique Characterization of a Fine Fraction of CDW and Assessment of Reactivity in a CDW/Lime System |
| title_sort | multi technique characterization of a fine fraction of cdw and assessment of reactivity in a cdw lime system |
| topic | fine particle waste concrete-based CDW mineralogy pozzolanicity hydrated phases |
| url | https://www.mdpi.com/2075-163X/10/7/590 |
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