Sterile Clay Pozzolans from Phosphate Mining

Neto, José Afonso de Matos; Resende, Domingos Sávio de; Neto, João Trajano da Silva; Gouveia, Antônio Maria Claret de; Aguilar, Maria Teresa Paulino; Bezerra, Augusto César da Silva

doi:10.1590/1516-1439.367014

Cited by 11 publications

(2 citation statements)

References 5 publications

(6 reference statements)

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“…Cementitious composites with a low environmental impact associated with high mechanical performance and good durability indicators can be produced using supplementary cementitious materials (SCM) 1 – 6 . In these composites, SCM can act as cementing, pozzolanic or filler materials 7 , 8 .…”

Section: Introductionmentioning

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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Section: Introductionmentioning

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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“…When it comes to infrastructure works, the challenges are accentuated by the large volumes of raw material used. The use of waste as a partial replacement for Portland cement is addressed in several works in the relevant literature [3,57,[116][117][118][119][120][121][122]. Other research investigates the development of alkali-activated materials from supplementary cementitious materials [123,124].…”

Section: Introductionmentioning

confidence: 99%

Low-Carbon Concrete Based on Binary Biomass Ash–Silica Fume Binder to Produce Eco-Friendly Paving Blocks

et al. 2020

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The civil construction industry consumes huge amounts of raw materials and energy, especially infrastructure. Thus, the use of eco-friendly materials is indispensable to promote sustainable development. In this context, the present work investigated low-carbon concrete to produce eco-friendly paving blocks. The binder was defined according to two approaches. In the first, a binary binder developed with eucalyptus biomass ash (EBA) and silica fume (SF) was used, in total replacement for Portland cement. In the second, the mixture of residues was used as a precursor in alkali-activation reactions, forming alkali-activated binder. The experimental approach was carried out using five different mixtures, obtained by varying the amount of water or sodium hydroxide solution. The characterization of this new material was carried out using compressive strength, expandability, water absorption, deep abrasion, microstructural investigation, and organic matter degradation potential. The results showed that the EBA-SF system has a performance compatible with Portland cement when used as an alternative binder, in addition to functioning as a precursor to alkali-activated concrete. The blocks produced degraded organic matter, and this degradation is more intense with the incidence of UV. In this way, the EBA-SF binder can be successfully used for the manufacture of ecological paving blocks with low carbon emissions.

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Ecological geopolymer produced with a ternary system of red mud, glass waste, and Portland cement

Silveira

Martins

Bezerra

et al. 2022

Cleaner Engineering and Technology

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Sterile Clay Pozzolans from Phosphate Mining

Cited by 11 publications

References 5 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

Low-Carbon Concrete Based on Binary Biomass Ash–Silica Fume Binder to Produce Eco-Friendly Paving Blocks

Ecological geopolymer produced with a ternary system of red mud, glass waste, and Portland cement

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