Combined Effects of Non-Conforming Fly Ash and Recycled Masonry Aggregates on Mortar Properties
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Author
Torres Gómez, Ana Isabel
Ledesma, Enrique F.
Otero Izquierdo, Rocío
Fernández, José María
Jiménez Romero, José Ramón
De Britto, Jorge
Publisher
MDPIDate
2016Subject
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