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A study of CO2 capture by high initial strength Portland cement pastes at early curing stages by new non-conventional thermogravimetry and non-conventional differential thermal analysis

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Abstract

Although the literature presents intensive studies based on monitoring cement hydration in adiabatic and semi-adiabatic environments, such as non-conventional differential thermal analysis (NCDTA) systems, studies of cement hydration in controlled climatic chambers are very rare. Using three W/C ratios (0.5, 0.6 and 0.7) and three relative humidity conditions (60, 80 and 100%) at 25 °C, the authors analyzed in real time the evolution of cement hydration reaction during the first 24 h in an environmental-controlled chamber. The main objective of this paper is to present two new developed systems of NCDTA (NNCDTA) and non-conventional TG and to show, using high-strength sulfate-resistant Portland cement pastes in a controlled chamber as application examples, how the developed systems measure on real time the thermal effects and the mass changes that occur during hydration and carbonation reactions. The captured CO2 mass can be quantified as it occurs by carbonation curves. The results are in agreement with the mechanical and structural properties of the used pastes and with their TG/DTG data, after being processed by different operational conditions. Carbonation for 24 h alters significantly the cement hydrated paste composition, resulting in final poor mechanical resistance properties. However, carbonation for 1 h, in specific conditions, enhances them when compared to a non-carbonated reference paste, due to a final higher content of silica and alumina hydrated phases and to a lower mass ratio between that of their combined water and their total mass as well.

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  1. Patent pending.

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Acknowledgements

The authors acknowledge the experimental assistance of the Federal University of Rio de Janeiro, School of Chemistry, the Thermal Analysis and Civil Engineering Structure Laboratories and the financial support of the National Research Council (CNPq).

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Authors and Affiliations

  1. College of Architecture Engineering and Technology, Federal University of Mato Grosso, Av. Fernando Corrêa da Costa no 2367 – Bairro Boa Esperança, Cuiabá, MT, CEP 78060-900, Brazil

    Alex Neves Junior

  2. Civil Engineering Program, COPPE-Federal University of Rio de Janeiro, R. Horácio de Macedo, Cidade Universitária, Rio de Janeiro, RJ, CEP 21941-450, Brazil

    Romildo Dias Toledo Filho & Eduardo de Moraes Rego Fairbairn

  3. School of Chemistry, Federal University of Rio de Janeiro, R. Horácio de Macedo, Cidade Universitária, Rio de Janeiro, RJ, CEP 21941-450, Brazil

    Jo Dweck

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  1. Alex Neves Junior
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  3. Jo Dweck
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  4. Eduardo de Moraes Rego Fairbairn
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Correspondence to Alex Neves Junior.

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Neves Junior, A., Toledo Filho, R.D., Dweck, J. et al. A study of CO2 capture by high initial strength Portland cement pastes at early curing stages by new non-conventional thermogravimetry and non-conventional differential thermal analysis. J Therm Anal Calorim 129, 1341–1352 (2017). https://doi.org/10.1007/s10973-017-6326-0

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  • DOI: https://doi.org/10.1007/s10973-017-6326-0

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