Carbonation and CO2 uptake of concrete

Yang, Keun–Hyeok; Seo, Eun-A; Tae, Sungho

doi:10.1016/j.eiar.2014.01.004

Cited by 108 publications

(52 citation statements)

References 8 publications

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“…We use published particle size distributions for Nordic countries to estimate distributions in Europe 18,48 , and a combination of European and Chinese distribution to estimate values applicable to the U.S.. Finally, we adopt particle size distributions in Japan and South Korea in estimating carbon uptake for demolished concretes in the rest of world 39,46 (Supplementary Data 12).…”

Section: Demolition Stagementioning

confidence: 99%

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Substantial global carbon uptake by cement carbonation

et al. 2016

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Calcination of carbonate rocks during the manufacture of cement produced 5% of global CO2 emissions from all industrial process and fossil-fuel combustion in 20131, 2. Considerable attention has been paid to quantifying these industrial process emissions from cement production2, 3, but the natural reversal of the process—carbonation—has received little attention in carbon cycle studies. Here, we use new and existing data on cement materials during cement service life, demolition, and secondary use of concrete waste to estimate regional and global CO2 uptake between 1930 and 2013 using an analytical model describing carbonation chemistry. We find that carbonation of cement materials over their life cycle represents a large and growing net sink of CO2, increasing from 0.10 GtC yr−1 in 1998 to 0.25 GtC yr−1 in 2013. In total, we estimate that a cumulative amount of 4.5 GtC has been sequestered in carbonating cement materials from 1930 to 2013, offsetting 43% of the CO2 emissions from production of cement over the same period, not including emissions associated with fossil use during cement production. We conclude that carbonation of cement products represents a substantial carbon sink that is not currently considered in emissions inventories1, 3, 4

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Section: Demolition Stagementioning

confidence: 99%

“…The surface area of exposed concrete, duration of exposure, and exposure conditions of demolished concretes will therefore vary substantially. The fate of demolition waste in different regions is taken from different literature sources 18,24,38,39,[44][45][46] (Supplementary Table8).…”

Section: Demolition Stagementioning

confidence: 99%

Substantial global carbon uptake by cement carbonation

et al. 2016

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“…For this purpose, a database containing information about the CO 2 -reducing performance and the cost of environmentally-friendly construction technologies that are applicable to apartment houses was constructed, and an interpretation program was built based on a simplified technique for assessing the life cycle CO 2 emission of an apartment house and the unit costs based on the inter-industry relation table. Yang et al [7] analyzed a reliable procedure to assess the carbon dioxide (CO 2 ) uptake of concrete by carbonation during the service life of a structure and by the recycling of concrete after demolition. To generalize the amount of absorbable CO 2 per unit volume of concrete, the molar concentration of constituents in hardened cement paste was simplified as a function of the unit content of cement, and the degree of hydration of the cement paste was formulated as a function of the water-to-cement ratio.…”

Section: Literature Reviewmentioning

confidence: 99%

Analysis of CO2 Emission Characteristics of Concrete Used at Construction Sites

Kim

Chae

Kim³

et al. 2016

Sustainability

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Abstract:As the greenhouse gas reduction goal of 37% below business-as-usual (BAU) by 2030, the construction industry is recognized as an anti-environment industry for mass consumption/mass waste; thus, members of the industry are requested to make efforts to transform it into an environment-friendly industry. Concrete, a common construction material, is known to emit large amounts of environmentally hazardous waste during the processes related to its production, construction, maintenance, and demolition. The amount of greenhouse gas (GHG) emissions by the product is specified in a ready-mixed concrete report whenever concrete is sold commercially. Hence, there have been many studies addressing the quantitative evaluation and reduction of the environmental effects of concrete. This study aims to introduce a method for assessing the amount of carbon dioxide emission from the processes of producing concrete. Moreover, we measured the quantities of CO 2 emission of about 10 under-construction projects, including office buildings, apartment buildings, and high-rise residential buildings in South Korea. Using the assessment result, we analyzed the CO 2 reduction performance of an office building in South Korea and drew conclusions about measures for reducing CO 2 emission.

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“…The scarcity of asphalt production plants creates a logistical problem in the worksite and higher costs. Furthermore, the use of a concrete layer favours reducing the amount CO 2 in the environment since it reacts with portlandite during the carbonation process (11)(12). This phenomenon is improved by adding calcium oxide to the concrete mix because more portlandite is generated.…”

Section: Introductionmentioning

confidence: 99%

Eco-trench: a novel trench solution based on reusing excavated material and a finishing layer of expansive concrete

et al. 2017

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ABSTRACT:Installing utility pipelines generates a significant amount of trench arisings, which are usually transported to landfills instead of being reused as backfill material. This practice generates CO 2 emissions and wastes raw materials. This paper presents a more sustainable solution, an eco-trench, which is based on re-using trench arisings as backfill and adding a top layer of expansive concrete to improve the eco-trench's structural performance. The technical feasibility of the eco-trench was evaluated through a finite element model, which identified the degree of expansion in concrete required to avoid failure or subside the stresses caused by traffic. The potential expansion of concrete was measured under confined conditions in the laboratory by means of a novel test developed for this purpose. The results showed that adding calcium oxide generates the required internal stress. The results were then confirmed in a pilot experience. RESUMEN:Ecozanja: una nueva solución de zanja basada en la reutilización de material excavado y una capa de hormigón expansivo. Las zanjas para instalaciones de servicios generan un elevado volumen de materiales de excavación que son transportados a vertederos en lugar de ser reaprovechados como relleno. Esto conlleva un mayor consumo de materias primas y emisiones de CO 2 asociadas al transporte. Este estudio presenta una solución más sostenible, denominada ecozanja, basada en la reutilización de los materiales de excavación como relleno de la zanja con una capa superficial de hormigón expansivo. Su aplicabilidad se evalúa mediante un modelo de elementos finitos que permite determinar el grado de expansión necesario en el hormigón para garantizar la resistencia de las tensiones debidas al tráfico de vehículos sobre la zanja. La expansividad del hormigón se evaluó mediante un ensayo desarrollado específicamente para tal objetivo. Los resultados indican que la adición de óxido de calcio genera las tensiones internas necesarias. Asimismo, la propuesta se validó mediante una experiencia piloto en obra.

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Carbonation and CO2 uptake of concrete

Cited by 108 publications

References 8 publications

Substantial global carbon uptake by cement carbonation

Substantial global carbon uptake by cement carbonation

Analysis of CO2 Emission Characteristics of Concrete Used at Construction Sites

Eco-trench: a novel trench solution based on reusing excavated material and a finishing layer of expansive concrete

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