Abstract
ABSTRACT Ahead of the incorporation of residues in concrete composition, there is a decline in the environmental impact of buildings. One of the goals of today’s development is the employment of low-impact energy sources, such as thermoelectric. Thermoelectric industries display a high rate of residues, among which is pointed out coal bottom ash (CBA) (15% total residues), which have density superior to fly ash and accumulates in silos. Considering this scenario, this paper assessed the incorporation feasibility of CBA in the composition of cellular concrete, replacing silica fume. This study comprehended CBA characterization and application. For such, it was performed a scanning electron microscope (SEM) associated with Energy dispersive spectroscopy (EDS) analysis, laser granulometry, X-ray diffraction (XRD), X-ray efflorescence and density. Following the incorporation of the residues in cellular concrete in place of silica fume, it was performed compression strength analysis and SEM anew, evaluating the impact of CBA’s insertion in concrete’s microstructure. The XRD results are complementary to the other analyses. With SEM technique, it was observed the predominance of spherical-shape particles. The compressive strength of CBA concretes was superior to the reference concrete from 0,13 to 0,74MPa.
Highlights
In light concrete development, it is aimed the decrease in density [1], increasing the acoustic and thermal performance [2], and minimum mechanical resistance properties, allowing its application in walls
Coal bottom ashes (CBA) are residues originated from thermoelectrical plants and represent 15% of all the ash generated in this sort of industry
The particle size test pointed for a similarity between coal bottom ash (CBA) and the silica fume
Summary
It is aimed the decrease in density [1], increasing the acoustic and thermal performance [2], and minimum mechanical resistance properties, allowing its application in walls. Alongside the development of special concretes, it is studied the insertion of residues in concretes, whether as a partial or a total substitution of cement or natural aggregates [2, 5, 6]. Coal bottom ashes (CBA) are residues originated from thermoelectrical plants and represent 15% of all the ash generated in this sort of industry. These ashes may replace the aggregates and the concrete binders as well, with no damage to the characteristics of the materials that compose it, [1, 13-14]. This article aims the development of cellular concretes, substituting their natural aggregates for CBA, verifying the characteristics of the achieved composite and limitations to its use
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