Produção Nacional
Revisado por pares
Physical and Chemical Properties of Waste Foundry Exhaust Sand for Use in Self-Compacting Concrete
2021; Multidisciplinary Digital Publishing Institute; Volume: 14; Issue: 19 Linguagem: Inglês
10.3390/ma14195629
ISSN1996-1944
AutoresMaria Auxiliadora de Barros Martins, Lucas Ramon Roque da Silva, Maria Ranieri, Regina Mambeli Barros, Valquíria Claret dos Santos, Paulo César Gonçalves, Márcia Regina Baldissera, Rosa Cristina Cecche Lintz, Luísa Andréia Gachet Barbosa, Carlos Barreira Martinez, Mírian de Lourdes Noronha Motta Melo,
Tópico(s)Material Selection and Properties
ResumoThe reuse of waste in civil construction brings environmental and economic benefits. However, for these to be used in concrete, it is necessary a previous evaluation of their physical and chemical characteristics. Thus, this study aimed to characterize and analyze the waste foundry exhaust sand (WFES) for use in self-compacting concrete (SCC). Foundry exhaust sand originates from the manufacturing process of sand molds and during demolding of metal parts. It is a fine sand rich in silica in the form of quartz collected by baghouse filter. Characterization of WFES was conducted through laser granulometry, scanning electron microscopy (SEM) in the energy dispersive spectroscopy (EDS) mode, X-ray diffraction (XRD), X-ray fluorescence (XRF), Fourier transform infrared spectroscopy (FTIR), thermogravimetry (TG) and derivative thermogravimetry (DTG) techniques. The waste was classified as non-hazardous and non-inert, with physical and chemical properties suitable for use in SCC composition, as fine aggregate or mineral addition. Five mixtures of SCC were developed, in order to determine the waste influence in both fresh and hardened concrete. The properties in the fresh state were reached. There was an increase in compressive strength and sulfate resistance, a decrease in water absorption of self-compacting concrete by incorporating WFES as 30% replacement.
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