Thermal and mechanical analyses of colored mortars produced using Brazilian iron ore tailings

Morais, Camila Fernandes de; Belo, Barbara Rodrigues; Bezerra, Augusto César da Silva; Loura, Rejane Magiag; Porto, Matheus P.; Bessa, Sofia Araújo Lima

doi:10.1016/j.conbuildmat.2020.121073

Cited by 20 publications

(8 citation statements)

References 12 publications

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“…The composites SF and QPC had a reduction in water absorption by 50% and 8%, respectively, compared to the RS composite. This indicates that pozzolanic activity acted more significantly in pore refinement and decreased water absorption to the filler effect [106][107][108][109] .…”

Section: Resultsmentioning

confidence: 94%

Influence of quartz powder and silica fume on the performance of Portland cement

Tavares

Costa

et al. 2020

Sci Rep

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Supplementary cementitious materials interact chemically and physically with cement, influencing the formation of hydrate compounds. Many authors have analyzed the filler and pozzolanic effect. However, few studies have explored the influence of these effects on hydration, properties in the fresh and hardened states, and durability parameters of cementitious composites separately. This study investigates the influence of the replacement of 20% of Portland cement for silica fume (SF) or a 20-µm medium diameter quartz powder (QP) on the properties of cementitious composites from the first hours of hydration to a few months of curing. The results indicate that SF is pozzolanic and that QP has no pozzolanic activity. The use of SF and QP reduces the released energy at early times to the control paste, indicating that these materials reduce the heat of hydration. The microstructure with fewer pores of SF compounds indicates that the pozzolanic reaction reduced pore size and binding capability, resulting in equivalent mechanical properties, reduced permeability and increased electrical resistance of the composites. SF and QP increase the carbonation depth of the composites. SF and QP composites are efficient in the inhibition of the alkali-aggregate reaction. The results indicate that, unlike the filler effect, the occurrence of pozzolanic reaction strongly influences electrical resistance, reducing the risk of corrosion of the reinforcement inserted in the concrete.

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Section: Resultsmentioning

confidence: 94%

Influence of quartz powder and silica fume on the performance of Portland cement

Tavares

Costa

et al. 2020

Sci Rep

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“…Some studies point to the feasibility of inserting these samples in construction materials [10], such as applying iron ore tailings (IOT) as a substitute for natural fine aggregate [11]. Iron ore tailings have also been applied as a partial substitute for cement in concrete [12,13], in colored mortars [14] in the production of pigments for paints [15], in the manufacture of bricks [16,17], in the production of microconcretes [18], and as a precursor in the synthesis of geopolymers [19][20][21][22].…”

Section: Iron Ore Tailingsmentioning

confidence: 99%

Characterization and Analysis of Iron Ore Tailings Sediments and Their Possible Applications in Earthen Construction

Bessa,

Duarte,

Lage

et al. 2024

Buildings

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Mineral extraction is of ultimate importance for the economies of different countries, and Brazil is one of the world’s leading producers of iron ores. Unfortunately, dams are still the main problem, mainly in Minas Gerais, especially after the Fundão Dam rupture in 2015. Additionally, there is still a massive presence of buildings built on earth throughout the Minas Gerais mining region, built from the 18th century to today. Investigating the potential of iron ore tailings (IOT) to be incorporated into traditional earthen construction techniques in regions affected by dam ruptures presents a relevant and innovative research approach. In addition, the local reuse of these sediments should be the priority. Thus, the main objective of this work was to collect, characterize, and analyze the possibilities of the application of these tailings to produce rammed earth (RE). A complete characterization analysis was performed on the samples collected at three points. To analyze the soil-IOT compatibility, representative mixtures of RE were produced, and the specific mass, compaction, and compressive strength were performed. It was observed that the IOT samples have a high silica content and that the mixtures of IOT–soil, even without cement, reached the compressive strength values of the international standards, or even above them.

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“…Another factor that could contribute to a reduction in strength is the replacement of fine aggregate with pigment, but when sand is replaced with pigment, the amount of water needed to produce the mortar is adjusted. The percentage of 6% should not significantly affect the strength of the mortar, especially if the substitution is less than 10% [43].…”

Section: Mechanical Resistancementioning

confidence: 99%

Development of Decorative Mortars with Pigments from Acid Mine Drainage: Analysis of Physical and Mechanical Properties

Lermen,

Orlando,

Silva

2023

Mining

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The construction industry is recognized for its high consumption of natural resources, resulting in significant environmental impacts. Given this reality, it is essential to seek new methods and solutions that minimize the impact of this activity on the environment. An innovative approach consists of using pigments derived from acid mine drainage (AMD) as a sustainable alternative in the production of mortar for decorative façade cladding. In this context, the main objective of this paper was to evaluate the physical/mechanical properties of decorative mortars developed by partially replacing natural sand with pigment from acid mine drainage. Initially, the pigment (yellow) was produced, characterized, and compared with a commercial pigment. Sequentially, decorative mortars were developed with different pigment concentrations (0%, 2%, 4%, and 6%). The mortars were subjected to compressive strength, flexural tensile strength, shrinkage, loss of mass, and colorimetry tests. The results showed that compressive strength, flexural tensile strength, weight loss, and dimensional variation were significantly affected by the partial addition of pigment to replace natural aggregate. In other words, there was a decrease in strength and an increase in mass loss and expansion of the mortars. However, the main factor influencing these variables was the greater amount of water added in the higher substitution cases. The addition of water was necessary to keep the consistency constant. A possible solution to maintain the same amount of water and avoid negative effects on the mortar properties would be to use additives in the mortar formulation in future work. Therefore, this research contributes to the search for more sustainable solutions in civil construction, exploring the use of pigments from AMD as a viable alternative to reduce the environmental impacts associated with this industry.

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Thermal and mechanical analyses of colored mortars produced using Brazilian iron ore tailings

Cited by 20 publications

References 12 publications

Influence of quartz powder and silica fume on the performance of Portland cement

Influence of quartz powder and silica fume on the performance of Portland cement

Characterization and Analysis of Iron Ore Tailings Sediments and Their Possible Applications in Earthen Construction

Development of Decorative Mortars with Pigments from Acid Mine Drainage: Analysis of Physical and Mechanical Properties

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