Combined Effects of Non-Conforming Fly Ash and Recycled Masonry Aggregates on Mortar Properties
Autor
Torres Gómez, Ana Isabel
Ledesma, Enrique F.
Otero Izquierdo, Rocío
Fernández, José María
Jiménez Romero, José Ramón
De Britto, Jorge
Editor
MDPIFecha
2016Materia
MortarsNon-conforming fly ash
Powdered addition
Recycled aggregates
Construction and demolition waste
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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