Evaluation of the mechanical and durability properties of eco-efficient concretes produced with porcelain polishing and scheelite wastes

Medeiros, Alisson Gadelha de; Gurgel, Marcelo Tavares; Silva, Walney G. da; Oliveira, Marilía P. de; Ferreira, Ruan L.S.; Lima, Francisco J.N. de

doi:10.1016/j.conbuildmat.2021.123719

Cited by 24 publications

(8 citation statements)

References 42 publications

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“…The ST consists mainly of calcium oxide (CaO > 47%), from calcite, and silicon (SiO2 > 26%), from quartz. The alumina (Al2O3) content was higher than 9%, compositions similar to those found by by (Medeiros et al, 2021). The mineralogical phases identified in the XRD patterns were the following: quartz (JCPDS 46-1045), calcite (JCPDS 72-1937), mica (JCPDS 83-1808), and feldspar (JCPDS 09-0465).…”

Section: Characterization Of Scheelite Tailingssupporting

confidence: 80%

“…These tailings are accumulated in piles or deposition basins exposed to wind and rainwater. According to the Brazilian Mineral Summary, in 2017, Brazil produced approximately 593 tons, representing only 0.62% of all world production (Medeiros et al, 2021). In addition to causing accumulations in mining companies, these tailings lead to environmental contamination such as global warming, terrestrial acidification, and freshwater eutrophication (Furberg et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

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Resistance to the alkali-aggregate reaction of sustainable mortars produced with scheelite tailings in replacing natural sand aggregates

Medeiros

Fernandes

Costa

et al. 2021

RSD

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This work produced coating mortars with scheelite tailings (ST) in total replacement of natural sand aggregate. The chemical and mineralogical composition of the scheelite tailings was determined by X-ray diffraction (XRD) and X-ray fluorescence (XRF). Mortar samples with a mass proportion of 1:2:9 (cement: lime: sand/scheelite tailings) were prepared with and without the scheelite tailings. The mortars were evaluated by mercury intrusion porosimetry and compressive and flexural strength tests. The resistance to the alkali-aggregate reaction was assessed from the bar expansion test and by scanning electron microscopy (SEM) in the crack and pore regions. The results indicate that until the 22nd day, the scheelite tailings were not reactive; however, in 28 days, the expansion was deleterious. SEM images did not detect the presence of amorphous alkaline gel characteristic of the alkali-aggregate reaction. Therefore, although the mortar with scheelite tailings aggregate has shown the deleterious potential to 28 days, mechanical tests indicate that it has the potential to be used as a coating mortar.

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Section: Characterization Of Scheelite Tailingssupporting

confidence: 80%

Section: Introductionmentioning

confidence: 99%

Resistance to the alkali-aggregate reaction of sustainable mortars produced with scheelite tailings in replacing natural sand aggregates

Medeiros

Fernandes

Costa

et al. 2021

RSD

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“…Then, the data obtained were normalized and presented by means of a ternary diagram, as shown in Figure 10 . For data normalization, the method proposed by [ 57 ] was used, in which first the absolute sum of each value of the selected hardened properties is performed, and then the value of the contribution share of each property to a total value universe (1) is calculated. The normalization of the results is presented in Table 6 .…”

Section: Resultsmentioning

confidence: 99%

Effects of Particle Size Distribution of Standard Sands on the Physical-Mechanical Properties of Mortars

et al. 2023

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Obtained natural sands can present different particle size distributions (PSD), although they have the same mineralogical origin. These differences directly influence the physical and mechanical behavior of mortars and, therefore, the performance of mortar and ceramic renderings. Standardizing the particle size of sands based on pre-established requirements in normative standards (NBR 7214 or ASTM C778) is one way to minimize these effects. However, these standards do not consider the optimization of the granular skeleton through the analysis of bulk density and PSD, which may be insufficient to obtain satisfactory results. Therefore, this paper analyzes the effects of using different particle size ranges on the physical and mechanical behavior of cement and hydrated lime mortars. The properties of consistency index, bulk density, air content, capillary water absorption, water absorption by immersion, flexural strength, compressive strength, and dynamic modulus of elasticity were evaluated. For this purpose, standardized sands of the same mineralogical origin were made with different particle size ranges, being: (i) standardized sand constituted by 25% of coarse and fine fractions (S25-control), (ii) standardized sand constituted by 30% of coarse fraction and 20% of fine fraction (S30-20), and (iii) standardized sand composed by 40% of coarse fraction, and 10% of fine fraction (S40-10), respectively. The results indicated that variations in the particle size composition of the standardized sands are necessary to obtain mixtures with higher compactness and, therefore, mortars with better physical and mechanical performance. Thus, the dosage of the particle size fractions of standardized sand should consider the optimization of the granular skeleton, being the unit mass and the granulometric composition as important parameters to meet this premise.

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“…To maintain the proportion of fine:water ratio constant, a high-performance superplasticizer additive with a density of 1.08 g/cm 3 was used. The composition of concretes was based on a previous study [31], which utilized an optimization process of materials' granulometry and properties in the hardened state to determine the optimal levels of substitution as approximately 80 wt% of natural sand by SR and 15 wt% of Portland cement by PPR. The addition of superplasticizer (0.5 wt% of fine materials -Portland cement+PPR) and a fixed mortar content (α, Eq.…”

Section: Methodsmentioning

confidence: 99%

Hardened state and binder efficiency of concrete produced with wastes of porcelain polishing and scheelite

Costa,

Medeiros,

Codes

et al. 2023

Cerâmica

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Reducing Portland cement consumption in concrete compositions, managing industrial waste, and conserving natural resources are contemporary challenges to achieving sustainable development. One solution has been the utilization of these industrial wastes as partial replacements for Portland cement or aggregates in concrete production. Due to the significant variability of these wastes, further research on this topic is necessary. Therefore, this study aimed to evaluate the properties of concrete mixtures containing porcelain polishing residue (PPR), scheelite residue (SR), and different types of Portland cement. The physical, chemical, and mineralogical characteristics of the wastes were determined. The fresh and hardened properties of the concretes, as well as the analysis of environmental impact, in terms of carbon dioxide emissions related to binder consumption, were investigated. The results showed that the utilization of these wastes resulted in reductions in consistency, water absorption, porosity, and compressive strength at 28 days by up to 33%, 16%, 13%, and 7%, respectively. Furthermore, improvements in microstructure, binder index, and CO 2 index were observed. The wastes reduced the cement content and CO 2 emissions per cubic meter of concrete to achieve 1 MPa by up to 12%. These findings suggested that the utilization of these wastes may be a viable and sustainable alternative to reduce Portland cement consumption and mitigate the environmental impact of the concrete industry. However, further research and studies are needed to assess other aspects, such as long-term durability and economic feasibility before their widespread adoption in the construction industry.

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Evaluation of the mechanical and durability properties of eco-efficient concretes produced with porcelain polishing and scheelite wastes

Cited by 24 publications

References 42 publications

Resistance to the alkali-aggregate reaction of sustainable mortars produced with scheelite tailings in replacing natural sand aggregates

Resistance to the alkali-aggregate reaction of sustainable mortars produced with scheelite tailings in replacing natural sand aggregates

Effects of Particle Size Distribution of Standard Sands on the Physical-Mechanical Properties of Mortars

Hardened state and binder efficiency of concrete produced with wastes of porcelain polishing and scheelite

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