Balance emissions and CO2 uptake in concrete structures: simulation based on the cement content and type

Félix, Emerson Felipe; Possan, Edna

doi:10.1590/s1983-41952018000100008

Cited by 16 publications

(7 citation statements)

References 11 publications

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“…where dem S is the total superficial area of concrete cubes that is in contact with the atmosphere in the post-demolition period (m 2 ); par S is the superficial area of 30×30×30mm concrete cubes (m 2 ); par V is the volume of 30×30×30mm crushed concrete cubes (m 3 ); nc V (m 3 ) is the volume of concrete that has not been carbonated, given by [62] ( )…”

Section: Comentioning

confidence: 99%

Influence of supplementary cementitious material on CO2 balance of cracked RC members in their whole life cycle

Wang,

Tu,

Val

2024

Preprint

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The building construction industry is a significant source of carbon dioxide (CO2) emissions. To reduce CO2 emissions, supplementary cementitious materials are widely used in the concrete. At the same time, during the service life and post-demolition period of the reinforced concrete (RC) members, atmospheric CO2 is absorbed by carbonation. In the present paper, influence of the supplementary cementitious material (SCM) on CO2 balance, i.e., the difference between the CO2 emissions and uptakes, of cracked RC members in their whole life cycle (including the service and post-demolition periods) is evaluated. Three types of concrete — ordinary Portland cement (OPC) concrete and two ‘green’ concretes (one with 30% of fly ash (FA) and the other one with 50% ground granulated blast-furnace slag (GGBS)), are considered. The carbonation depths in the cracked RC members are estimated based on the results of accelerated carbonation tests of cracked RC test specimens made from the same types of concrete. Corrosion initiation times, service life and repair times of the cracked RC beams are determined under different exposure conditions. Finally, the CO2 emissions and absorptions of the cracked RC members are assessed over their whole life cycle. The resulting CO2 balance assessments on cracked RC beams made from the same types of concrete in the test show that, from the view of the whole life cycle, the OPC RC members have a noticeably worse environmental impact than the RC members made from the GGBS concretes; while the RC members from the GGBS concrete are more environmentally friendly than those from the FA concrete.

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Section: Comentioning

confidence: 99%

Influence of supplementary cementitious material on CO2 balance of cracked RC members in their whole life cycle

Wang,

Tu,

Val

2024

Preprint

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“…Desde 2009, com o lançamento da Cement Sustainability Initiative (CSI) no World Business Council for Sustainable Development (WBCSD), o setor compila dados de produção, indicando a liberação de 832 kg de CO2 por tonelada de clínquer fabricado globalmente em 2019. Sendo a combustão dos combustíveis fosseis responsável por cerca de 40% das emissões totais de CO2, enquanto a decomposição do calcário (CaCO3) durante a calcinação é responsável pelo restante (FELIX; POSSAN, 2018;SNIC, 2019).…”

Section: Introductionunclassified

Resistência À Compressão De Pastas Cimentícias Compostas Com Pós Reciclados De RCD

Oliveira¹,

Leite²,

Possan³

et al. 2023

Rev. Foco

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Estudo do pó reciclado de resíduo de construção e demolição (RCD) como material cimentício suplementar (MCS) ao cimento Portland comum (OPC) como uma alternativa para redução do consumo de aglomerante e à problemática da disposição de resíduos oriundos da Construção Civil. O objetivo da pesquisa foi avaliar a resistência à compressão de pastas compostas com teores de 0%, 7%, 15%, 20% e 25% de pó reciclado de RCD em substituição ao OPC, em volume. Os resíduos foram cominuídos em moinho de mandíbulas e peneirados até a fração <0,15mm, dando origem ao pó reciclado de concreto (RCP), pó reciclado misto (RMP) e pó reciclado cerâmico (RBP). A caracterização dos materiais foi realizada por massa específica, finura Blaine e granulometria a laser. O potencial pozolânico dos resíduos foi avaliado. Os resultados indicam que embora os pós de RCD não atendam os parâmetros normativos para classificação como materiais pozolânicos, estes auxiliam no incremento do desempenho mecânico de matrizes cimentícias compostas, a longo prazo. A resistência à compressão das pastas com até 20% de RCD como fíler atinge desempenho equivalente ou superior em relação à referência, cimento Portland composto com fíler – CPII – F 32 (FPC), com potencial de mitigar na mesma proporção o teor de ligante. O incremento mais expressivo de desempenho mecânico foi em pastas compostas com RCP aos 91 dias. O estudo indicou ainda que empregar pó reciclado de concreto e pó reciclado misto apresenta estatisticamente o mesmo efeito.

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“…In Brazil, the production of different types of cement is carried out by the addition of different materials, still in the grinding phase. In addition to clinker, such materials consist of other raw materials, such as blast-furnace slag and pozzolanic and carbonate materials, giving rise to CP II-E, CP II-Z and CP II-F, respectively [12]. Besides these raw materials, plaster is added to clinker in all cement classes in order to delay the hardening time.…”

Section: Introductionmentioning

confidence: 99%

Glass powder from non-returnable bottles: Pozzolanic additive to mortar

Brito¹,

Martins²,

magalhães³

et al. 2022

ETSJournal

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Solid waste from disposable long neck bottles was used as pozzolanic additive to the cement matrix. Mortar specimens containing finely ground glass (90-53 µm) until 15 wt% were evaluated for physical and mechanical properties. The mechanical test showed an increase of 97% (greater than the values found in the literature) in the axial compression strength of the samples containing glass due to the increased pozzolanic activity index caused by glass addition to mortar. The mechanical strength was relatively greater when the glass particle size was reduced (53-38µm). The pozzolanic activity was observed at advanced ages either, by Brazilian standardized tests or thermal reactions between water and calcium hydroxides. Scanning electron microscopy reinforced the hydrated-calcium silicates present after calcium hydroxide consumption, characteristic of pozzolanic materials. From a technical and environmental viewpoint, the use of glass waste from long neck bottles as pozzolanic additive to the cement matrix proved to be feasible.

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Balance emissions and CO2 uptake in concrete structures: simulation based on the cement content and type

Cited by 16 publications

References 11 publications

Influence of supplementary cementitious material on CO2 balance of cracked RC members in their whole life cycle

Influence of supplementary cementitious material on CO2 balance of cracked RC members in their whole life cycle

Resistência À Compressão De Pastas Cimentícias Compostas Com Pós Reciclados De RCD

Glass powder from non-returnable bottles: Pozzolanic additive to mortar

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