INFLUENCE OF THE RECYCLED AGGREGATE ON THE MORTARS PROPERTIES WITH DIFFERENT CHEMICAL ADMIXTURES

Author(s): Paulo C. C. Gomes, Cássia V. A. Melo, Alexandre N. Lima., Tassyano F. Amorim, Fábio C. Oliveira, Alysson L. Lessa
Paper category: Proceedings
Book title: IV International Conference Progress of Recycling in the Built Environment
Editor(s): Isabel M. Martins, Carina Ulsen, Yury Villagran
ISBN:
e-ISBN: 978-2-35158-208-4
Publisher: RILEM Publications SARL
Publication year: 2018
Pages: 138-145
Total Pages: 08
Language : English

Abstract: Obtaining less dense mortars, where compressive strength is not the most important property,
the recycled aggregates may contribute due their greater porosity. However, aspects related to
fluidity can be highly influenced by the presence of recycled aggregates. In the study, the
obtaining of self-compacting and lightweight mortars with and without recycled aggregates was
evaluated verifying the behavior with different chemical admixtures. The recycled aggregates
originated from concrete block residues and the used admixtures were: superplasticizer (SP),
air-entraining agent (AEA) and viscosity modifier (VMA). The mortar self-compactibility was
evaluated in flow, spreading and flow time tests, and density by specific mass. Comparing the
mortars with and without recycled aggregate, it was observed that: the use of the recycled
aggregate altered the admixtures dosage. The maximum SP content, without segregation, was
higher for natural aggregate mortar. The maximum content of AEA was more efficient in the
mortar with recycled aggregate. The mortar fresh density with recycled aggregate, without
admixtures, was lower than that of the natural aggregate mortar. In both mortars, the use of SP
did not significantly alter the density.

Online publication : 2018
Publication type : full_text
Public price (Euros) : 0.00