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Title: Effect of Temperature and Humidity on the Synthesis of Alkali-Activated Binders Based on Bottom Ash from Municipal Waste Incineration
Author: Tortora, Pietro C.D.
Maldonado Alameda, Alex
Mañosa Bover, Jofre
Quintero-Payan, Alex C.
Leonelli, Cristina
Lancellotti, I.
Chimenos Ribera, Josep Ma.
Keywords: Materials de construcció
Building materials
Waste products
Issue Date: 6-Feb-2022
Publisher: MDPI
Abstract: Weathered bottom ash (WBA) from municipal solid waste incineration is a calcium aluminosilicate-rich material mainly used in construction and civil engineering as a secondary aggregate. However, its use is also being considered as a precursor in the manufacture of alkali-activated binders (AA-WBA). This preliminary research aimed to deepen understanding of the potential use of WBA (>8 mm fraction) as the sole precursor of alkali-activated binders. To gain better knowledge of this material, the physicochemical, mechanical, and environmental properties of AA-WBA binders were evaluated. In addition, the effect of curing temperature (25 °C, 45 °C, 65 °C, and 85 °C) and humidity conditions (oven and climate chamber) were assessed. The results of this study revealed that temperature and humidity conditions play a fundamental role during the early formation stages of AA-WBA binders. Maximum compactness and compressive strength (29.8 MPa) were obtained in the sample cured at 65 °C in the oven and room humidity. At higher temperatures (85 °C), a substantial decrease in mechanical strength (21.2 MPa) was observed due to a lower cohesion of the binder phases. Curing in the climate chamber led to an increase in humidity, and therefore a decrease in compressive strength. Finally, lower porosity and longer curing time substantially decreased the heavy metals and metalloid leaching concentration of AA-WBA binders.
Note: Reproducció del document publicat a:
It is part of: Sustainability, 2022, vol. 14, num. 3, p. 1848
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ISSN: 2071-1050
Appears in Collections:Articles publicats en revistes (Ciència dels Materials i Química Física)

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