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Materials 2016, 9(9), 729; doi:10.3390/ma9090729

Combined Effects of Non-Conforming Fly Ash and Recycled Masonry Aggregates on Mortar Properties

1
Construction Engineering Area, EPS de BELMEZ, University of Córdoba, Córdoba 14002, Spain
2
Department of Mechanics, EPS de BELMEZ, University of Córdoba, Córdoba 14002, Spain
3
Inorganic Chemical Area, Faculty of Science, University of Córdoba, Córdoba 14071, Spain
4
Inorganic Chemical Area, EPS de BELMEZ, University of Córdoba, Córdoba 14002, Spain
5
CERIS-ICIST, Instituto Superior Técnico, University of Lisbon, Av. Rovisco Pais, Lisbon 1049-001, Portugal
*
Authors to whom correspondence should be addressed.
Academic Editor: Geminiano Mancusi
Received: 2 August 2016 / Revised: 18 August 2016 / Accepted: 19 August 2016 / Published: 25 August 2016
View Full-Text   |   Download PDF [3319 KB, uploaded 25 August 2016]   |  

Abstract

This work evaluates the effects of using non-conforming fly ash (Nc-FA) generated in a thermoelectric power plant as filler material for mortars made with natural sand (NA) and recycled sand from masonry waste (FRMA). The incorporation of powdered recycled masonry filler (R-MF) is also tested as an alternative to siliceous filler (Si-F). Three families of mortars were designed to study: the effect of replacing Si-F with Nc-FA on mortars made with NA; the effect of replacing Si-F with Nc-FA on mortars made with 50% of NA and 50% of FRMA; and the effect of replacing Si-F with R-MF on mortars made with NA and FRMA. Replacing Si-F with Nc-FA is a viable alternative that increases the mechanical strength, the workability and durability properties and decreases the shrinkage. The use of FRMA and Nc-FA improved the mechanical strength of mortars, and it slightly increased the shrinkage. The replacement of Si-F with R-MF on mortars made with FRMA is not a good alternative, because it has a negative impact on all of the properties tested. This work can help both to reduce cement and natural resources’ consumption and to increase the recycling rate of Nc-FA and FRMA. View Full-Text
Keywords: mortars; non-conforming fly ash; powdered addition; recycled aggregates; construction and demolition waste mortars; non-conforming fly ash; powdered addition; recycled aggregates; construction and demolition waste
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Torres-Gómez, A.I.; Ledesma, E.F.; Otero, R.; Fernández, J.M.; Jiménez, J.R.; de Brito, J. Combined Effects of Non-Conforming Fly Ash and Recycled Masonry Aggregates on Mortar Properties. Materials 2016, 9, 729.

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