Hydration of Portland cement with red mud as mineral addition

Romano, Roberto; Bernardo, Heitor Montefusco; Maciel, Marcel Hark; Pileggi, Rafael Giuliano; Cincotto, Maria Alba

doi:10.1007/s10973-017-6794-2

Cited by 63 publications

(25 citation statements)

References 30 publications

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“…New kinds of mineral admixtures are gradually being used in concrete production because the traditional mineral admixtures are becoming increasingly scarce [2]. Recently, in the cement industry, there has been an increasing interest in partially or completely replacing cement with industrial solid wastes, such as fly ash [21,22], yellow phosphorous slag [4,23], red mud [24,25], blast furnace slag [26,27], and phosphogypsum [28,29].…”

Section: Introductionmentioning

confidence: 99%

Study on the Preparation and Fracture Behavior of Red Mud-Yellow Phosphorus Slag-Based Concrete

Zhang

Mao

et al. 2019

Advances in Materials Science and Engineering

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Serious environmental pollution issues caused by the storage and exposure of large amounts of red mud (RM) and yellow phosphorus slag (YPS) have raised significant concerns. Red mud-yellow phosphorous slag-cement concrete (RM-YPS-CC) is prepared with 25% yellow phosphorus slag content (YPSC) and 10% red mud content (RMC) to replace a portion of the cement at the age of 28 days and was found in this study to satisfy the mechanical property requirements. More ettringite and portlandite were generated with the RM-YPS-CC than with the yellow phosphorous slag-cement concrete (YPS-CC). In addition, the cementitious materials were more interlaced, and there was more disorder in the crystals of the RM-YPS-CC, which formed a more complex spatial structure than the YPS-CC did. Without RM, the initial cracking strength on the surface of the concrete was 5–6 MPa, the maximum crack width was 3.96 mm, and the crack number was 8. However, the cracking strength was 26.5–27 MPa with RMC5, the maximum crack width was 0.66 mm with RMC15, and the crack number was 3 with RMC15. Moreover, studies using the digital image correlation (DIC) method indicated that the displacement distribution and evolution of the first crack area changed quickly at 10 MPa in either horizontal or vertical direction, and a similar trend was maintained from 10 MPa to 27.1 MPa for the YPS-CC. However, with a small distribution and evolution of horizontal or vertical displacement from 5 MPa to 25 MPa, the evolution would change rapidly when reaching 30 MPa for RM-YPS-CC. This study aims to provide new insights into the wide application of YPS and RM for saving energy and reducing emissions and to develop a new method to study the fracture behavior of concrete.

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Section: Introductionmentioning

confidence: 99%

Study on the Preparation and Fracture Behavior of Red Mud-Yellow Phosphorus Slag-Based Concrete

Zhang

Mao

et al. 2019

Advances in Materials Science and Engineering

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“…Construction is one of the leading destinations of mining waste since this sector consumes a large amount of raw material. Brazilian studies have evaluated the use of waste from iron ore processing [35,36] and its first stages of industrialisation [37,38], as well as the waste from bauxite processing [39][40][41] to produce cement, mortars and concrete [37,38]. Other studies with this waste have proposed the use in the production of bricks, tiles, flooring etc.…”

Section: The Different Stages Of the Brazilian Mining And Cement Indumentioning

confidence: 99%

Circular Economy and Solid Waste Management: Challenges and Opportunities in Brazil

et al. 2021

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Brazil has a vast territory and regional diversity, which turn the promotion of circular economy (or its improvement) into a complex challenge. This paper aims to analyse these challenges and solid waste management opportunities as a driving force for the circular economy in Brazil. Therefore, two significant challenges are discussed in this paper: increasing industrial waste recovery and improving the selective collection of municipal solid waste. Industries are concentrated in the country's South and Southeast regions, where 56% of the population live and where the best logistic infrastructure is also located. These features can help the circular economy related to industrial and municipal solid waste in those regions but bring challenges concerning the waste generated in the other part, such as the Brazilian Amazon. According to legislation, the productive sector is responsible for its products before and after use (waste prevention actions). One of the national laws establishes reverse logistic systems for several items, such as agrochemical packaging and electrical and electronic waste, but some sectors have better results than others in terms of circular economy. The cement industry in Brazil is highlighted as a case of relative success. On the other hand, the mining industry in Brazil has challenges related to the large amount of waste generated with high environmental and social risks, which caused several large accidents in the last years.

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“…To start the discussion on calorimetry, it is important to note that experimental and precision differences observed between semi-adiabatic and isothermal calorimetry methods are not directly comparable and sometimes with significant differences 73 , 74 . The results of the semi-adiabatic paste calorimetry test (Table 4 ) allow identifying the end of the induction period and the maximum temperature of the exothermic peak associated with the acceleration of clinker hydration 75 , 76 . The partial replacement of cement for silica fume (SFP) and quartz powder (QPP) reduced the maximum temperature reached to RP, indicating that these materials can lower the heat of hydration 30 , 77 , 78 .…”

Section: Resultsmentioning

confidence: 99%

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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Hydration of Portland cement with red mud as mineral addition

Cited by 63 publications

References 30 publications

Study on the Preparation and Fracture Behavior of Red Mud-Yellow Phosphorus Slag-Based Concrete

Study on the Preparation and Fracture Behavior of Red Mud-Yellow Phosphorus Slag-Based Concrete

Circular Economy and Solid Waste Management: Challenges and Opportunities in Brazil

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

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