Cement substitution by a recycled cement paste fine: Role of the residual anhydrous clinker

Bordy, Arthur; Younsi, Akli; Aggoun, Salima; Fiorio, Bruno

doi:10.1016/j.conbuildmat.2016.11.080

Cited by 85 publications

(54 citation statements)

References 25 publications

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“…Gastaldi et al [17] and Schoon et al [15] used up to 30% of fine recycled material (grain diameter <63 µm) mainly for the production of Portland clinker, obtaining favorable results in terms of C 2 S content in the clinker. Considering the significant amount of non-hydrated cement in the fine fraction of recycled concrete, Bordy et al [18] presented the results of studies of composite in which part of the cement was replaced with finely ground (to diameter below 80 µm) powder made by crushing and milling of cement paste made in laboratory conditions. It was observed that there was about 24% of active clinker in the cement paste that could be rehydrated.…”

Section: Introductionmentioning

confidence: 99%

The Properties of Composites with Recycled Cement Mortar Used as a Supplementary Cementitious Material

Kalinowska-Wichrowska

Kosior‐Kazberuk

Pawluczuk

2019

Materials

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The process of recycling concrete rubble is accompanied by the formation of a large amount of fine fraction, which cannot be reused as aggregate. The results of research on the possibility of using recycled cement mortar (RCM), obtained during concrete recycling, as a cementitious supplementary material, are presented. The experimental research was carried out on the basis of two variables determining the recycling process: X 1 -temperature (range of variation 288-712 • C) and X 2 -time (range of variation 30-90 min) of thermal treatment of concrete rubble. The experiment included 10 series of new composites made with RCMs subjected to different variants of thermal treatment, and two additional control series. The best treatment parameters were determined based on the assessment of selected physical and mechanical properties of the new cement composites, as well as the analysis of characteristics and microstructure of RCM. The test results showed that proper thermal treatment of concrete rubble makes it possible to obtain a high-quality fine fraction, which has the properties of an active addition and can be used as a partial replacement for cement in mortars and concretes.

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Section: Introductionmentioning

confidence: 99%

The Properties of Composites with Recycled Cement Mortar Used as a Supplementary Cementitious Material

Kalinowska-Wichrowska

Kosior‐Kazberuk

Pawluczuk

2019

Materials

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“…The hydration of the calcium silicates produces a family of structurally similar, essentially amorphous or little crystalline silicates. CH is the second most abundant hydration product, forming crystalline aggregates [31,32]. Ettringite is formed by hydration of alita (C 3 S) in the presence of gypsum (hydrated calcium sulfate).…”

Section: Characterization Of the Cement Samplesmentioning

confidence: 99%

The influence of low amounts on in situ-polymerized bisphenol-diamine net in cement slurries prepared in seawater – structural analysis after long-term contact with in situ-generated mud-acid fracturing fluid

Santos

Ribeiro

et al. 2020

Matéria (Rio J.)

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Inadequate zonal isolation in oil wells can provoke safety and environmental problems. New cement slurries can avoid such problems. In this work, novel cement slurries were prepared in the presence of seawater with in situ-formed epoxy resin–ethylenediamine. The new slurries were tested in relation to their mechanical properties and characterized by FTIR, XRD, TG/DTG, porosimetry by N2 adsorption-desorption and solid-state 29Si and 27Al NMR. Some kinetic features of long-term contact of the slurries with in situ-generated mud-acid were performed to evaluate the performances of the new slurries in routine acidizing procedures in oil well industry. The experimental kinetic data were well fitted to order-variable exponential kinetic model and a factorial design of four variables (24). In these studies, it was possible to evaluate in detail how some important experimental factors act on the quantities of acid that interact with the pastes, as well as to verify how these factors affect the speed with which the mud-acid interacts with the slurries. The results strongly suggest that the interactions occurred at epoxy/ethylenediamine cement slurry/mud-acid interfaces are due to surface reactions with preservation of the chemical structures of the cement slurries, even after long-term contact with mud-acid. The new cement slurry present good features to be used in environmental-friendly procedures in oil well field.

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“…SONG et al [5], com base em análises por TGA e DRX em alta temperatura (HT-DRX), indicaram que etringita e monossulfato se desidratam completamente até 91 °C e 160 °C, respectivamente, e que a maior parte da desidratação do C-S-H ocorre no intervalo de 80-240 °C, enquanto que a decomposição das cadeias de silicatos de C-S-H ocorre em torno de 615-630 °C. CHOUDHARY et al [16] e BIRICIK e SARIER [22] utilizaram FTIR para avaliar a formação de fases hidratadas e não hidratadas em pastas de cimento, contudo, esta técnica ainda é pouco empregada para análise de decomposição térmica ou reidratação das pastas [23].…”

Section: Introductionunclassified

“…Os autores concluíram que o aumento da relação água/cimento (a/c) das pastas submetidas ao aquecimento reduziu a resistência à compressão, diminuiu o tempo de pega e aumentou a demanda de água na consistência normal das pastas após a reidratação. BORDY et al [23], por sua vez, estudaram a reciclagem de resíduos de pastas de cimento submetidos a moagem sem tratamento térmico como substituição parcial em cimento. Os autores concluíram que o cimento hidratado reciclado não propiciou efeito fíler e sítios de nucleação suplementares nos compósitos cimentícios e que a contribuição desse resíduo foi devido à reatividade das suas fases anidras.…”

Section: Introductionunclassified

Efeito do teor de água e tamanho de partícula na decomposição térmica de pastas de cimento moídas

et al. 2020

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RESUMO Um método alternativo para produção de concretos ecoeficientes seria a substituição parcial de cimento Portland por resíduos de pastas e argamassas submetidas a um tratamento termomecânico. Neste contexto, este estudo avalia a influência da relação água/cimento (a/c) e do tamanho médio das partículas na decomposição térmica do cimento hidratado. Pastas de cimento com três relações a/c (0,40, 0,50 e 0,60) e curadas por 28 dias foram moídas para obtenção de granulometrias com tamanho médio de 0,60 mm e 0,15 mm. A decomposição térmica das pastas foi analisada por termogravimetria (TGA), difração de raios X (DRX) e espectroscopia no infravermelho por Transformada de Fourier (FTIR). A análise de TGA indica que o teor de água quimicamente combinada é favorecido pelo aumento da relação a/c entre 0,40 e 0,50, mas é constante para a/c de 0,50 e 0,60. A redução do tamanho médio quase não interfere nas curvas de TGA. De acordo com as análises por DRX e TGA, a maior parte dos hidratos se decompõe até 500-550°C, enquanto que silicatos de cálcio e aluminatos de cálcio similares às fases anidras do cimento Portland foram detectados na pasta aquecida a 750°C. Assim, temperaturas mais altas seriam necessárias para a completa recuperação do cimento anidro em pastas hidratadas.

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Cement substitution by a recycled cement paste fine: Role of the residual anhydrous clinker

Cited by 85 publications

References 25 publications

The Properties of Composites with Recycled Cement Mortar Used as a Supplementary Cementitious Material

The Properties of Composites with Recycled Cement Mortar Used as a Supplementary Cementitious Material

The influence of low amounts on in situ-polymerized bisphenol-diamine net in cement slurries prepared in seawater – structural analysis after long-term contact with in situ-generated mud-acid fracturing fluid

Efeito do teor de água e tamanho de partícula na decomposição térmica de pastas de cimento moídas

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