Modeling temperature profile in mass concrete at early ages of cement hydration

  • Authors

    • Ugwuanyi Donald Chidiebere University of Nigeria, Nsukka
    • Okafor Fidelis Onyebuchi University of Nigeria, Nsukka
    2021-02-27
    https://doi.org/10.14419/ijet.v10i1.30533
  • Modeling, Temperature, Mass Concrete, Finite Difference, MATLAB, Software.
  • Thermally induced cracks due to temperature gradient in mass concrete have adverse effects on its durability and service life. Heat released during the hydration of Portland cement in early age mass concrete can be quite excessive depending on the ambient temperature, cement content of the concrete mix and the size. Finite difference model using Crank Nicholson implicit method was developed based on the two dimensional unsteady state heat conduction. Optimized MATLAB based software was developed for simulation and data visualization. A mass concrete block cast with standard mix ratio and water cement ratio was used to verify the efficacy of the model. Type-K thermocouple and digital thermometer were used to monitor the temperature at time intervals. The temperature profile showed a hotter core and cooler surface except for the initial placement temperature, which exhibited a uniform temperature for all thermocouple locations. Peak temperature values were recorded within the first day of concrete placement. The model successfully predicted the temperature profile of the mass concrete at early ages of cement hydration. With the knowledge of the ambient temperature and the configuration of the mass concrete, the model can reliably predict the temperature profile from which potential for thermal cracks occurrence can be determined to enable suitable proactive preventive and control measures.

     

     

  • References

    1. [1] I. Milovanovic, B. Pecure, I. Gabriel, Measuring thermal properties of hydrating cement pastes, 31st Cement and Concrete Science Conference, Novel Development and Innovation in Cementitious Materials, Imperial College London, United Kingdom, paper number XX (2011).

      [2] B. Klemczak, A. Knoppik-Wróbel, Reinforced concrete tank walls and bridge abutments: early-age behaviour, Analytic Approaches and Numerical Models, Engineering Structures, 84(2015) 233–251. https://doi.org/10.1016/j.engstruct.2014.11.031.

      [3] L. Jendele, V. Smilauer, J. Cervenka, Multi-scale analysis of heat transport in hydrating concrete structures, Proceedings of the Thirteenth International Conference on Civil, Structural and Environmental Engineering Computing, Civil-Comp Press, Stirlingshere, Scotland, paper 124(2011).

      [4] G. Liu, Y. Hu, Q. Li, Z. Zuo, XFEM for thermal cracks of massive concrete, Mathematical Problems in Engineering, https://doi.org/10.1155/2013/343842.

      [5] S. Wu, D. Huang, F. B. Liu, H. Zhao, P. Wang, Estimation of cracking risk of concrete at early age based on thermal stress analysis, J.Therm. Anal Calorim, Vol. 105, (2011) 171-186. https://doi.org/10.1007/s10973-011-1512-y.

      [6] G. De Schutter, Modeling of early age thermal cracking in hardening concrete including creep and softening behaviour, Concrete Science and Engineering, 3 (2001) 146-150.

      [7] J. Cervenka, L. Jendel, V. Smilauer, Modeling of crack development in young concrete in young concrete, VIII International Conference on Fracture Mechanics of Concrete and Concrete Structures, FraCos-8, (2017) 1-11.

      [8] D. P. Bentz, Transient plane source measurement of the thermal properties of hydrating cement pastes, Materials and Structures, 40 (2007) 1073-1080. https://doi.org/10.1617/s11527-006-9206-9.

      [9] M. Cervera, J. Oliver, T. Prato, Thermo-chemo-mechanical model for concrete: hydration and aging, Journal of Engineering Mechanics, 125 (9) (1999) 1018-1027. https://doi.org/10.1061/(ASCE)0733-9399(1999)125:9(1018).

      [10] B. Kuriakose, B. N. Rao, G. R. Dodagoudar, Modeling of early age concrete temperature distribution in thick rafts, 5th International Congress on Computational Mechanics and Simulation, (2014) 10 -13. https://doi.org/10.3850/978-981-09-1139-3_294.

      [11] H. Abeka, S. Agyeman, M. A. Asamoah, Thermal effect of mass concrete structures inthe tropics: experimental, modeling and parametric studies, Cogent Engineering, 4 (2017) 1278297. https://doi.org/10.1080/23311916.2016.1278297.

      [12] W. G. J. Prasanna, A. P. Subhashini, Cracking due to temperature gradient in concrete, International on Sustainable Built Environment (ICSBE), Kandy, (2010) 496-504.

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  • How to Cite

    Donald Chidiebere, U., & Fidelis Onyebuchi, O. (2021). Modeling temperature profile in mass concrete at early ages of cement hydration. International Journal of Engineering & Technology, 10(1), 64-71. https://doi.org/10.14419/ijet.v10i1.30533