Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Characterization and Possible Uses of Recycled Aggregates from Construcction and Demolition Waste from Mexico City

Version 1 : Received: 21 March 2018 / Approved: 21 March 2018 / Online: 21 March 2018 (07:52:05 CET)

A peer-reviewed article of this Preprint also exists.

Moreno-Pérez, E.; Hernández-Ávila, J.; Rangel-Martínez, Y.; Cerecedo-Sáenz, E.; Arenas-Flores, A.; Reyes-Valderrama, M.I.; Salinas-Rodríguez, E. Chemical and Mineralogical Characterization of Recycled Aggregates from Construction and Demolition Waste from Mexico City. Minerals 2018, 8, 237. Moreno-Pérez, E.; Hernández-Ávila, J.; Rangel-Martínez, Y.; Cerecedo-Sáenz, E.; Arenas-Flores, A.; Reyes-Valderrama, M.I.; Salinas-Rodríguez, E. Chemical and Mineralogical Characterization of Recycled Aggregates from Construction and Demolition Waste from Mexico City. Minerals 2018, 8, 237.

Abstract

In this study, four samples of recycled aggregates from construction and demolition waste of Mexico City were characterized, in order to find innovative uses for this type of materials. Gravel and sand from a recycling plant were analyzed, as well as recycled aggregates in the laboratory from demolished concrete collected in landfills. The characterization was carried out by means of XRD, chemical microanalysis (EDS), pH measurement and sieve analysis. The results reveal that the minerals present in the analyzed materials are triclinic feldspars, cristobalite and pyroxene which correspond to the natural aggregates, as well as variable amounts of calcite, product of the carbonation of the cement paste adhered to these aggregates and in a smaller proportion calcium hemicarboaluminate, rosenhanite and tobermorite. It was determined that the quality (amount of cement) of the original concrete that was recycled, has great influence on the granulometry and the chemical-mineralogical composition of the aggregates, since there will be different quantities and qualities of cement paste adhered to the aggregates of according to size. Finally the pH values measured in all samples fluctuate between 10.15 and 12.08, therefore it is suggested that these materials can be used in soil stabilization.

Keywords

recycled aggregates; cement paste; carbonation; calcite; pH

Subject

Environmental and Earth Sciences, Geochemistry and Petrology

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