Estudio comparativo de pastas de cemento adicionadas con catalizador de craqueo catalítico usado (FCC), y metacaolín (MK)

Agredo, Janneth Torres; García, Silvia Izquierdo; Serna, Jenny Trochez; Gutiérrez, Ruby Mejía de

doi:10.18359/rcin.246

Cited by 6 publications

(6 citation statements)

References 22 publications

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“…This was due to the high reactivity of the material (Borrachero et al, 2002;Jung-Hsiu et al, 2003;Pacewska et al, 2002a). Similar results have been found by Trochez et al, 2010;Torres et al, 2012b, showing that the residue of the catalytic cracking catalyst presents a high reactivity. This assertion results evident in the consumption of calcium hydroxide, which comes from cement hydration.…”

Section: Introductionsupporting

confidence: 73%

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Permeation properties of Concrete Added with a Petrochemical Industry Waste

Torres-Agredo¹,

Torres-Castellanos²,

Mejía-de-Gutiérrez³

2017

Ing. Inv.

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The aim of this study is to evaluate the permeation properties of concrete added with a residue of a petrochemical industry located in Colombia, called catalytic cracking catalyst residue (FCC). Concrete samples with 10, 20 and 30 % of FCC incorporated as cement replacement were evaluated. As reference materials, concrete without addition and concrete added with 20 % of metakaolin (MK) were used. MK is a high performance pozzolan of chemical composition similar to the FCC. The properties studied, in addition to the compressive strength, were: water absorption by total immersion, porosity, surface absorption and capillary sorption. The results showed that the concrete added with FCC and MK had similar behavior, and were slightly higher than the control sample. The total absorption and porosity were below 5 % and 10 % respectively for all samples; this means that the incorporation of the addition reduces the permeability of concrete. In this sense, FCC is considered as a good alternative for producing more durable concrete, being the optimum percentage, 10 % cement replacement.Keywords: Fluid catalytic cracking, metakaolin, pozzolanic additions, blended concrete, permeation properties, durability. RESUMENEl objetivo de este estudio es evaluar las propiedades de permeación de concretos adicionados con un residuo de una industria petroquímica localizada en Colombia, llamado residuo de catalizador de craqueo catalítico (o FCC, por sus siglas en inglés). Se evaluaron concretos con 10, 20 y 30 % de FCC incorporado como reemplazo del cemento. Como materiales de referencia se utilizaron concreto sin adición y concreto adicionado con 20 % de metacaolin y una puzolana de alto desempeño que presenta composición química similar al FCC. Además de la resistencia a la compresión, las propiedades estudiadas fueron la absorción de agua por inmersión total, la porosidad, la absorción superficial y la absorción capilar. Los resultados mostraron que los concretos adicionados con FCC y MK tuvieron un comportamiento similar, y fueron ligeramente superiores a la muestra control. La absorción total y la porosidad estuvieron por debajo del 5 % y 10 %, respectivamente para todas las muestras, esto significa que la incorporación de la adición contribuye a una menor permeabilidad. En este sentido, el FCC se considera una buena alternativa para producir concretos durables. A su vez, se recomienda utilizar un porcentaje del 10 % como reemplazo del cemento.Palabras clave: Catalizador de craqueo catalítico, metacaolín, adiciones puzolánicas, concreto adicionado, propiedades de permeación, durabilidad.

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Section: Introductionsupporting

confidence: 73%

“…In contrast, the MK used in this research, is predominantly of amorphous shape, with traces of quartz as the only crystalline phase (Torres et al, 2012a, Torres et al, 2012bTrochez et al, 2010).…”

Section: Torres-castellanos Torres-agredo and Mejía-de-gutierrezmentioning

confidence: 92%

Permeation properties of Concrete Added with a Petrochemical Industry Waste

Torres-Agredo¹,

Torres-Castellanos²,

Mejía-de-Gutiérrez³

2017

Ing. Inv.

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“…the lowest peak intensities were observed in the compositions with a composite pozzolanic additive (C-CMK and CP-CMK). The obtained results could suggest that FCCW not only accelerates early cement hydration [44] but also encourages the formation of hydration products (portlandite) in later cementitious material curing periods. Uniformly distributed fine MK particles in the cementitious material react with portlandite during the pozzolanic reaction to produce products such as C-S-H, C-A-H, and C-S-H and C-A-S-H, the key products of cement hydration, were not identified in any X-ray diffraction curves cement paste composition and curing time (7 and 28 days) due to their amorphous nature [34,[39][40][41].…”

Section: Analysis Of Hydration Products (Xrd and Tg-dtg)mentioning

confidence: 81%

“…A comparison of the portlandite peak intensities of the compositions with aluminosilicate pozzolanic additives only showed that the highest portlandite intensities were recorded in all cases involving compositions with a spent catalyst (C-CW and CP-CW), and the lowest peak intensities were observed in the compositions with a composite pozzolanic additive (C-CMK and CP-CMK). The obtained results could suggest that FCCW not only accelerates early cement hydration [44] but also encourages the formation of hydration products (portlandite) in later cementitious material curing periods. Uniformly distributed fine MK particles in the cementitious material react with portlandite during the pozzolanic reaction to produce products such as C-S- H, C-A-H, and C-A-S-H.…”

Section: Analysis Of Hydration Products (Xrd and Tg-dtg)mentioning

confidence: 81%

A Study on the Microstructure and Mechanical Properties of Portland Cement Incorporating Aluminosilicate Waste

Antonovič,

Sikarskas,

Boris

et al. 2024

Materials

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The influence of aluminosilicate pozzolanic waste, specifically spent fluid catalytic cracking waste (FCCW) and metakaolin waste (MK) from the expanded glass industry, on the properties of hardened Portland cement paste were analysed. The study involved replacing part of cement with FCCW and MK and observing their impact on the hydration, microstructure, density, and compressive strength of hardened cement paste. Various analysis methods were employed, including X-ray diffraction (XRD), thermogravimetric analysis (TG), and scanning electron microscopy (SEM), to understand the changes in the structure of the hardened cement paste during hydration. The findings revealed that FCCW tends to accelerate the cement hydration process due to its high surface area and pozzolanic activity. Notably, the formation of portlandite crystals was observed on FCCW particle surfaces in a specific direction. These crystals appeared smaller and developed in different directions in compositions containing a composite binder with mixture of FCCW and MK in a ratio 1:1. This could be influenced by pozzolanic reactions activated by fine particles of MK and the formation of calcium silicate hydrates (C-S-H) and calcium alumino silicate hydrates (C-A-S-H) in the presence of portlandite. The XRD and TG results indicated that the specimens containing a composite binder exhibited the least amount of portlandite. The compressive strength of these specimens increased compared to the control specimens, although the amount of cement was 9% lower.

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“…Thermogravimetric analysis is a more precise technique than XRD analysis to determine the amount of portlandite formed in hardened cement paste. TG-DTG curves of cement specimens after 7 and 28 days of curing are presented in Figures 10 and 11 TG-DTG curves reveal 3 endothermic peaks: the first one (30°C-300°C) is related to the processes that occur in this temperature range, namely evolution of free water (at 30°C-105°C), dehydration of CSH (at 115°C-120°C), ettringite (at 100°C-180°C), CAH and CASH (at 180°C-240°C); the second peak at 430°C~550°C is related to portlandite dissolution; and the third peak at 650°C~750°C is related to decarbonisation process [47][48][49][50]. Table 3 shows portlandite amount evaluation results in the temperature range 450°C-520°C according to Equation 1.…”

Section: Analysis Of Hydration Products (Xrd and Tg Dtg)mentioning

confidence: 99%

Study on Microstructure and Mechanical Properties of Portland Cement Incorporating Aluminosilicate Waste

Antonovič,

Sikarskas,

Boris

et al. 2023

Preprint

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The influence of aluminosilicate pozzolanic waste, specifically spent fluid catalytic cracking catalyst (FCCW) and metakaolin waste (MK) from expanded glass industry, on the properties of hardened Portland cement paste were analysed. The study involved replacing part of cement with FCCW and MK and observing their impact on hydration, microstructure, density and compressive strength of hardened cement paste. Various analysis methods were employed, including X-ray diffraction (XRD), thermogravimetric analysis (TG), and scanning electron microscopy (SEM), to understand the changes in the structure of hardened cement paste during hydration. The findings revealed that FCCW tends to accelerate cement hydration process due to its high surface area and pozzolanic activity. Notably, the formation of portlandite crystals was observed on FCCW particle surfaces in a specific direction. These crystals appeared smaller and developed in different directions in compositions containing a composite binder with mixture of FCCW and MK in a ratio 1:1. This could be influenced by pozzolanic reactions activated by fine particles of MK and the formation of calcium silicate hydrates (CSH) and calcium alumino silicate hydrates (CASH) in the presence of portlandite. XRD and TG results indicated that the specimens containing a composite binder exhibited the least amount of portlandite. The compressive strength of these specimens increased compared to control specimens, although the amount of cement was 9% lower.

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Estudio comparativo de pastas de cemento adicionadas con catalizador de craqueo catalítico usado (FCC), y metacaolín (MK)

Cited by 6 publications

References 22 publications

Permeation properties of Concrete Added with a Petrochemical Industry Waste

Permeation properties of Concrete Added with a Petrochemical Industry Waste

A Study on the Microstructure and Mechanical Properties of Portland Cement Incorporating Aluminosilicate Waste

Study on Microstructure and Mechanical Properties of Portland Cement Incorporating Aluminosilicate Waste

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