English   español  
Por favor, use este identificador para citar o enlazar a este item: http://hdl.handle.net/10261/164184
COMPARTIR / IMPACTO:
Estadísticas
logo share SHARE logo core CORE   Add this article to your Mendeley library MendeleyBASE

Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL
Exportar a otros formatos:
Título

Carbonation-Induced Mineralogical Changes in Coal Mining Waste Blended Cement Pastes and Their Influence on Mechanical and Microporosity Properties

AutorFrías, Moisés; Vigil de la Villa, Raquel; García, Rosario; Rodríguez, Olga; Fernández-Carrasco, Lucía; Martínez-Ramírez, S.
Fecha de publicación20-abr-2018
EditorMultidisciplinary Digital Publishing Institute
CitaciónMinerals 8(4): 169 (2018)
ResumenThe worldwide pursuit of new eco-efficient pozzolans is ongoing. Kaolinite-based waste is an eco-friendly source of recycled metakaolinite, a highly pozzolanic product. In this study, a blended cement paste containing 20% activated coal waste (ACW) was exposed to a 100% CO<sub>2</sub> atmosphere at 65% RH for 7 days. The variations in its phase composition and strength were studied and compared to an OPC control. Both pastes were cured for 28 days prior to the carbonation test. Reaction kinetics were assessed using XRD, SEM/EDX, TG/DTG, FT-IR, Micro-Raman spectroscopy, pore solution pH and the cumulative carbonated fraction. The blended cement carbonated 68% faster than the control. While portlandite carbonation was the main reaction in both cements, decalcification was also observed (more intensely in the 20% ACW paste) in other hydraulic calcium phases (C-S-H gel, monocarboaluminate (C<sub>4</sub>AcH<sub>12</sub>), ettringite and tetracalcium aluminate (C<sub>4</sub>AH<sub>13</sub>). The end product of this reaction was calcium carbonate, mainly in the form of calcite, although traces of aragonite and amorphous carbonate were also detected. Compressive strength values rose with accelerated carbonation time and pore size reduction in both cement pastes.
Versión del editorhttp://dx.doi.org/10.3390/min8040169
URIhttp://hdl.handle.net/10261/164184
DOI10.3390/min8040169
2075-163X
Aparece en las colecciones: (IETCC) Artículos
(CFMAC-IEM) Artículos
Ficheros en este ítem:
Fichero Descripción Tamaño Formato  
minerals-08-00169.pdf5,91 MBAdobe PDFVista previa
Visualizar/Abrir
Mostrar el registro completo
 


NOTA: Los ítems de Digital.CSIC están protegidos por copyright, con todos los derechos reservados, a menos que se indique lo contrario.