Determining the diffusion coefficient of Ca(OH)2 in concrete with age in an artificial seawater environment

  • Affiliations:

    1 Hanoi University of Mining and Geology, Hanoi, Vietnam
    2 Moscow State University of Civil Engineering (MGSU), Moscow, Russian Federation

  • *Corresponding:
    This email address is being protected from spambots. You need JavaScript enabled to view it.
  • Received: 1st-May-2024
  • Revised: 2nd-Aug-2024
  • Accepted: 1st-Sept-2024
  • Online: 1st-Oct-2024
Pages: 73 - 81
Views: 193
Downloads: 4
Rating: , Total rating: 0
Yours rating

Abstract:

Concrete structures exposed to marine environments, which contain high levels of Cl- and SO42- ions, accelerate the diffusion process of calcium hydroxide (Ca(OH)2), particularly in tidal zones due to the combined effects of carbonation and mechanical erosion from waves. The characteristic feature of the diffusion process of calcium hydroxide in concrete within marine environments is the diffusion coefficient of calcium hydroxide (k). This study involves an experiment to determine the calcium hydroxide content in concrete submerged in water containing 5% NaCl. Experimental results were combined with the solution of the uncertainty diffusion problem to determine the diffusion coefficient of calcium hydroxide in concrete samples with a standard compressive strength of 28.7 MPa. Comparisons with previous studies indicate that the diffusion coefficient of calcium hydroxide in concrete varies depending on the type of concrete. Additionally, the study reveals that the diffusion coefficient of calcium hydroxide in conventional concrete increases with prolonged immersion time. In previous studies, for high-strength concrete types using active mineral additives, this coefficient decreases over time. This study indicates that the different pore structures between conventional and high-strength concrete lead to different effects of permeability on these concrete types, resulting in varying trends of calcium hydroxide diffusion over time.

How to Cite
Ngo, H.Xuan and I., B.B. 2024. Determining the diffusion coefficient of Ca(OH)2 in concrete with age in an artificial seawater environment. Journal of Mining and Earth Sciences. 65, 5 (Oct, 2024), 73-81. DOI:https://doi.org/10.46326/JMES.2024.65(5).08.
References

Tran, D. (2005). Application of the Tang Luping-Olof Nilsson model to investigate the diffusion of Cl- ions in concrete and study the effect of additives on this process. PhD Thesis, University of Science - Vietnam National University, Hanoi, Vietnam, 118 pages.

Nguyen, M.P. (2007).Theory of Corrosion and Corrosion Prevention of Reinforced Concrete in Construction. Construction Publishing House, Hanoi, 95 pages.

Truong, H.C., Tran, V.Q., Nguyen, V.P., Huunh, Q. (2008). Study and Survey of the Current Corrosion Deterioration of Reinforced Concrete Structures and the Ingressibility of Coastal Environment in Da Nang City. Journal of Science and Technology, University of Da Nang, 6(29), 1-7.

Dong, K.H., Duong, T.T.H. (2011). The Corrosion Status of Reinforced Concrete Structures and Anti-corrosion Solutions for Reinforced Concrete Structures in the Marine Environment of Vietnam. Journal of Hydraulic Engineering and Environment, 11(2011), 44-49.

Dao, V.D. (2014). Prediction of Service Life of Reinforced Concrete Coastal Bridges in Vietnam Due to Chloride Ingress. PhD Thesis, University of Transport and Communications, Vietnam, 167 pages.

Pham, D.T. (ed.)(2020). Developing a Method for Predicting the Strength and Service Life of Concrete Structures in Marine Environments Using the Average Structure Model. Report on Research Project with Code: B2019-MDA-06, Ha Noi University of Mining and Geology.

Bộ Xây dựng (2006). Các tính chất của xi măng xỉ. T/C thông tin Khoa học Kỹ thuật xi măng, số 1/2006.

Nguyen, T.B. (2012). Causes of corrosion in concrete and reinforced concrete structures in hydraulic engineering projects - Preventive solutions. Journal of Hydraulic Engineering and Technology, 8(2012).

Choi, Y. S., Yang, E. I. (2013). Effect of calcium leaching on the pore structure, strength, and chloride penetration resistance in concrete specimens. Nuclear Engineering and Design 259(6/2013), 126-136.

Yang, H., Che, Y., Leng, F. (2018). Calcium leaching behavior of cementitious materials in hydrochloric acid solution. Sci Rep 8, 8806 (2018), 126-136.

Fedosov S. V., Roumyantseva V. E., Krasilnikov I. V., Narmania B. E. (2017). Formulation of mathematical problem describing physical and chemical processes at concrete corrosion. International Journal for Computational Civil and Structural Engineering, 2(13), 45-49.

Fedosov S. V., Roumyantseva V. E., Krasilnikov I. V., Konovalova V. S. (2018). Physical and mathematical modelling of the mass transfer process in heterogeneous systems under corrosion destruction of reinforced concrete structures. IOP Conference Series: Materials Science and Engineering. Novosibirsk, 2018, 012039.

Fedosov S.V., Rumyantseva V.E., Krasilnikov I.V. (2021). Methods of mathematical physics in applications to the problems of concrete corrosion in aggressive liquid environments. М.: АСВ, Moscow, 244 pages.

GOST 27677-88, (2021). Corrosion protection in construction. Concrete. General requirements for testing. Russian technical standard, 7 pages.

Ngo, X. H. (2022). Corrosion-resistant concrete with Modified Structure for Marine Structures. PhD Thesis, Moscow State University ofCivil Engineering, Russia, 146 pages.

Ngo. X. H. (ed.) (2023). Determination of the mass conductivity coefficient of calcium hydroxides in concrete for marine structures.  Journal "Vestnik GGTU. Technical Sciences", T. XIX, No. 4(34), 2023. 76-84.

Other articles