A review of alternative approaches to the reduction of CO2 emissions associated with the manufacture of the binder phase in concrete

Gartner, E.M.; Hirao, Hiroshi

doi:10.1016/j.cemconres.2015.04.012

Cited by 450 publications

(245 citation statements)

References 32 publications

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“…3, which presents calorimetric results for hydration of mixtures containing different amount of conventional low-calcium fly ash from combustion of hard coal. 1 In general, shapes of calorimetric curves of the rate of heat release are similar to those for Portland cement presented, e.g. in [51,52].…”

Section: Early Hydration Of Non-activated Mixtures Containing High Anmentioning

confidence: 53%

“…However, its production (especially clinkerisation process) generates several ecological and economic problems, such as consumption of great amount of energy and natural resources as well as emission of CO 2 . Different activities are undertaken to minimise these inconveniences, especially concerning reduction in emission of CO 2 [1]. One of them is utilisation of the supplementary cementitious materials (e.g.…”

Section: Introductionmentioning

confidence: 99%

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Influence of selected activating methods on hydration processes of mixtures containing high and very high amount of fly ash

Wilińska

Pacewska

2018

J Therm Anal Calorim

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Binders containing fly ash as cement substitute have been used for many years. Typical amount of fly ash in cement composite does not exceed 35% of mass of binder. Replacement of substantial amount of cement mass by fly ash results in retardation of hydration of binder and deterioration of some concrete properties, e.g. delay in setting time and reduction in early compressive strength. These inconveniences may be reduced using proper method of activation. In this paper, possibilities to activate binding mixtures containing high and very high amount of fly ash and low amount of Portland cement were discussed basing on the literature reports as well as on our own research results. Several activating methods were described, such as mechanical activation, exchanging of part of components of binder (cement, fly ash or both of them) by more reactive fine-grained material, chemical activation by the use of alkaline activators as well as combined methods. Possibilities of using these methods were discussed in relation to amount of fly ash introduced as replacement of cement and kind of fly ash used. Usefulness of calorimetry and thermal analysis methods was also presented.

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Section: Early Hydration Of Non-activated Mixtures Containing High Anmentioning

confidence: 53%

Section: Introductionmentioning

confidence: 99%

Influence of selected activating methods on hydration processes of mixtures containing high and very high amount of fly ash

Wilińska

Pacewska

2018

J Therm Anal Calorim

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“…The accumulated saving of limestones is only 236.3 thousand t due to low CaO content in alternative raw materials, 3.2% in fly ash and 2.8% in slag. However, compared to cases introduced by [36], the consumption of limestone in Kongtong is relatively high.…”

Section: Analysis On Ecological Effectsmentioning

confidence: 99%

Assessment of Comprehensive Effects and Optimization of a Circular Economy System of Coal Power and Cement in Kongtong District, Pingliang City, Gansu Province, China

Dong

Wang

et al. 2017

Sustainability

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Abstract:The idea of a circular economy (CE), which differs from traditional linear economy with a high consumption of natural resources and pollution, has captured much interest and attention. This paper uses a CE system of coal power and cement in Kongtong District, Pingliang City, Gansu Province, China as a case study to analyze the comprehensive effects of CE paradigm. Our simulation results, based on system dynamics (SD) modeling, infer that the transformation of manufacturing towards a CE system can prominently help coal power and cement enterprises reduce waste emission and increase economic profits. Through solid waste exchanges, a power plant can achieve over RMB 80 million of additional revenue per year at the highest level. CE also contributes to the reduction of regional pollution, saves mineral resources, and improves the atmospheric environment, an accumulated total of 14.11 million t of natural gypsum and 22.67 million t of coal can be saved. This sets a promising example for coal power and cement plants worldwide. Effective regulatory measures and further optimization towards a circular economy system are essential in maintaining the stable development of a CE system due to the risk of surplus production of upstream industries and other defects.

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“…The principal CO 2 -emitting sectors of the economy include coal-fired power plants, transportation, and major manufacturing construction industries such as steel and cement. In particular, the concrete industry impact on greenhouse gasses (GHG) emissions and non-renewable energy consumptions has been discussed in several publications [1,2]. According to Schneider et al [1], annual global cement production has reached 2.8 billion tons, and it is expected to increase up to 4 billion tons per years in a decade.…”

Section: Introductionmentioning

confidence: 99%

Plain and Ultrafine Fly Ashes Mortars for Environmentally Friendly Construction Materials

2018

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This paper is aimed to study the rheological and physical performance of mortars manufactured replacing Portland-based cements with low calcium siliceous fly ash (FA) or ultrafine fly ash (UFFA). Five different types of cement (CEM I, CEM II/A-LL, CEM III/A, CEM III/B, and CEM IV according to EN 197-1) were used. Mortars were manufactured with FA or UFFA replacing 5%, 15%, 25%, 35%, and 50% of cement mass. Results indicate that compressive strength of mortars with UFFA is considerably higher than that of mixtures containing traditional FA, both at early and long ages. Moreover, experimental data reveal that replacement of cement with up to 25% of UFFA determines higher compressive strength at 7, 28, and 84 days than plain mortars (containing cement only), regardless of the type of cement used. Mortars manufactured with 35% or 50% of UFFA show slightly lower or similar compressive strength compared to the reference mortar (containing cement only). In addition, the results show values of the strength activity index of mortars made with FA 25%, 23%, and 20% lower than the reference corresponding mortars (cement only) at 7, 28, and 84 days, respectively. The grinding of FA, despite resulting in an increase in production energy and CO 2 emissions compared to unmilled FA, allows a wide use of these SCM (Supplementary Cementitious Materials) in place of cement, reducing the environmental impact of mortars up to 40% at the 28-day strength class. The use of UFFA ensures better resistance in CaCl 2 -rich environments.

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A review of alternative approaches to the reduction of CO2 emissions associated with the manufacture of the binder phase in concrete

Cited by 450 publications

References 32 publications

Influence of selected activating methods on hydration processes of mixtures containing high and very high amount of fly ash

Influence of selected activating methods on hydration processes of mixtures containing high and very high amount of fly ash

Assessment of Comprehensive Effects and Optimization of a Circular Economy System of Coal Power and Cement in Kongtong District, Pingliang City, Gansu Province, China

Plain and Ultrafine Fly Ashes Mortars for Environmentally Friendly Construction Materials

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