Alternative cement clinkers

Gartner, E.M.; Sui, Tongbo

doi:10.1016/j.cemconres.2017.02.002

Cited by 362 publications

(215 citation statements)

References 12 publications

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“…Slightly less well examined is the potential mitigation of environmental impacts from the use of alternative cements, such as alkali-activated materials (e.g. [16]) or cement systems with different mineral composition to conventional cements [17]. Yet, the use of these materials has not been consistently codified, and for some, further material characterization is still needed [18,19].…”

Section: Introductionmentioning

confidence: 99%

The role of cement service-life on the efficient use of resources

Miller

2020

Environ. Res. Lett.

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The high demand for cement-based materials to support building and infrastructure systems is of growing concern as the production of cement leads to significant greenhouse gas (GHG) emissions and notable resource demand. While improved efficiency of cement use has been proposed as a means to mitigate these burdens, the effects of increasing longevity of cement in-use remains a poorly studied area. This work quantitatively explores the implications of using cement for a longer in-use residence times. Specifically, this work uses dynamic material flow analysis models to quantify the in-use stock of cement in the United States from 1900 to 2015. With these models, the implications of increasing or decreasing mean longevity of in-use cement on required cement production, demand for batching water, aggregates, and energy for cement-based materials, and GHG emissions are quantified. This work shows that a 50% increase in cement longevity could have led to a 14% reduction in material resource demand and GHG emissions from concrete production in the United States, equivalent to 0.28 to 0.83 Gt of batching water, 2.9 to 7.6 Gt of aggregates, 1E+06 to 2.3E+06 TJ of energy, and 0.4 to 0.7 Gt of CO 2 -eq emissions. This percent reduction exceeds goals for reducing GHG emissions through alternative energy resources, suggesting improving durability and longevity of in-use cement stock could be a critical means to mitigating environmental impacts.

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Section: Introductionmentioning

confidence: 99%

The role of cement service-life on the efficient use of resources

Miller

2020

Environ. Res. Lett.

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“…Recently, there are four classes of alternative clinker system that deserve serious attention with respect to global reductions in concrete-related CO 2 emissions [5]; reactive belite-rich Portland cement clinkers (RBPC), beliteye'elimite-ferrite clinkers, carbonatable calcium silicate clinkers, magnesium oxides derived from magnesium silicates.…”

Section: Introductionmentioning

confidence: 99%

“…For RBPC the belite content is more than 40% and alite normally less than 35%, making belite the most abundant phase in RBPC, as opposed to alite in OPC. The manufacture of RBPC therefore leads to lower specific energy consumption and CO 2 emissions, and also has the additional practical advantage of requiring less high-grade (low-silica) limestone as a raw material [5]. The ideal clinkering temperature for RBPC is usually close to 1350 °C, which is about 100 °C lower than the average for OPC, which can lead to somewhat lower kiln heat consumption and permit more use of low-grade kiln fuels.…”

Section: Introductionmentioning

confidence: 99%

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Early hydration of C2S doped with combination of S and Li

et al. 2020

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Production of low-energy cements would result in energy saving and lower CO 2 emissions related to reduced consumption of fuel and high-grade limestone as a raw material. Belite rich clinker, made more reactive by doping with combination of S and Li, could possibly be one of the low-energy alternatives for Portland cement clinker. Paper describes the preparation of doped belite and deals with its early hydration and reactivity. Belite rich clinkers were prepared in laboratory in high-temperature solid state synthesis. Pure substances were used for the preparation of raw meal and clinker. Early hydration heat flow development of cement pastes was monitored by isothermal calorimetry, changes in phase composition by "in situ" X-ray diffraction and TGA/DTA and microstructure by SEM-SE. Heat flow exotherms were correlated with quantified phase composition at given time. Intensity and position of main exothermic peak related to hydration of C 3 S is changing with increasing Li content. Doping of the C 2 S by the S or the combination of S and Li significantly increases the reactivity of the C 2 S-rich cement. The formation of C-S-H products is a continuous process that depends mainly on C 3 S during first 6 h and then is supported by slow reaction of β-C 2 S. The reactivity of C 2 S is affected by the timing of the hydration of other clinker phases. Two generations of portlandite formation detectable as a double endotherm on TGA/DTA can be attributed to hydration of C 3 S and β-C 2 S.

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“…La fabricación del CP suele ser muy contaminante, al emitirse alrededor de 90% de los gases de efecto invernadero respecto de todo el proceso de elaboración del concreto hidráulico debido a la cantidad de energéticos que se emplean, como carbón, aceite nuevo o reciclado, gas natural o neumáticos (Miller et al, 2016a). Es posible usar otros materiales alternativos como sustitución parcial del CP (Gartner and Sui, 2017), como la Pumicita (Hossain, 2004;Shi, 2001), en la que debe aplicar una activación mecánica (Bernotat and Schönert, 1998,36) y química (Shi and Day, 2000) para habilitarlo como un material cementante. En el caso del concreto utilizado en las vías terrestres, éste debe cumplir con criterios de diseño óptimos como es la resistencia a la compresión, flexión (o módulo de ruptura) o tensión por compresión diametral, para resistir y distribuir las cargas debidas al paso de los vehículos.…”

Section: Introductionunclassified

Caracterización Mecánica De Concretos Alcalinos Bases Pumicita Para Su Uso en Las Vías Terrestres

Hernández-Cabrera¹,

n²,

Maldonado-Bandala³

et al. 2019

Memorias Conpat 2019

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RESUMENEste trabajo tiene como objetivo analizar el comportamiento mecánico de concretos fabricados con Pumicita (P) activada alcalinamente, con diferentes porcentajes de activantes. Se prepararon 9 mezclas con sustitución del 30 al 70% en peso de cemento Portland (CP) por P, evaluando la resistencia a la compresión, módulo de ruptura y tensión por compresión diametral. Se encontró que al incrementarse en más del 30% de pumicita, en 7 mezclas disminuyen dichos parámetros, entre el 20 y 50%; 5 y 20%; y entre el 12 y 38% respectivamente. Las mezclas con 50% de pumicita y 10% de activantes, y 30% de pumicita y 6% de activantes presentaron resistencias mecánicas semejantes a las hechas con CP. ABSTRACTThe objective of this work is to analyze the mechanical behavior of concrete manufactured with Pumicite (P) activated alkaline, with different percentages of activants. 9 mixtures were prepared with substitution of 30 to 70% by weight of Portland cement (CP) per P, evaluating the compression resistance, modulus of rupture and tension by diametral compression. It was found that when increasing in more than 30% of pumicite, in 7 mixtures these parameters decrease, between 20 and 50%; 5 and 20%; and between 12 and 38% respectively. The mixtures with 50% of pumicite and 10% of activants, and 30% of pumicite and 6% of activants presented mechanical resistance similar to those made with CP. RESUMOO objetivo deste trabalho é analisar o comportamento mecânico de concretos fabricados com Pumicita (P) ativada alcalina, com diferentes porcentagens de ativantes. Foram preparadas 9 misturas com substituição de 30 a 70% em peso de cimento Portland (CP) por P, avaliando a resistência à compressão, módulo de ruptura e tensão por compressão diametral. Verificou-se que ao aumentar em mais de 30% de pumicite, em 7 misturas estes parâmetros diminuem, entre 20 e 50%; 5 e 20%; e entre 12 e 38% respectivamente. As misturas com 50% de pumicita e 10% de ativantes e 30% de pumicita e 6% de ativantes apresentaram resistência mecânica similar àquelas feitas com PC. Palavras-chave: Pumicite; concreto ativado; resistência mecânica CONPAT 2019, Tuxtla Gutiérrez, Chiapas, México -VICC137 CARACTERIZACIÓN MECÁNICA DE CONCRETOS ALCALINOS BASES PUMICITA PARA SU USO EN LAS VÍAS TERRESTRES I. R. HERNÁNDEZ-CABRERA, et al.

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Alternative cement clinkers

Cited by 362 publications

References 12 publications

The role of cement service-life on the efficient use of resources

The role of cement service-life on the efficient use of resources

Early hydration of C2S doped with combination of S and Li

Caracterización Mecánica De Concretos Alcalinos Bases Pumicita Para Su Uso en Las Vías Terrestres

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