n Journal of the South African Institution of Civil Engineering = Joernaal van die Suid-Afrikaanse Instituut van Siviele Ingenieurswese - Temperature rise in mass concrete elements - model development and experimental verification using concrete at Katse Dam : technical paper
|Article Title||Temperature rise in mass concrete elements - model development and experimental verification using concrete at Katse Dam : technical paper|
|© Publisher:||South African Institution Of Civil Engineering (SAICE)|
|Journal||Journal of the South African Institution of Civil Engineering = Joernaal van die Suid-Afrikaanse Instituut van Siviele Ingenieurswese|
|Publication Date||Jan 2004|
|Pages||9 - 14|
|Keyword(s)||Adiabatic calorimetry, Finite difference, Heat modelling, Hydration, Mass concrete, Maturity and Temperature|
This paper describes the development, operation and experimental verification of a finite difference heat model for predicting the time-based temperature profiles in large concrete elements. The model represents a two-dimensional solution to the Fourier heat flow equation and can be implemented in a commercially available spreadsheet package. <br>The proposed model uses the rate of internal heat evolution, determined from an adiabatic calorimeter, as input. This approach allows the model to use the heat rate of the actual concrete to be used in the structure. A further development is that the model uses a maturity function, rather than clock time, to describe the rate of heat development as well as the distribution of this rate over time or extent of hydration of the cement. <br>The paper also presents the results of a verification exercise which was conducted during the construction of the Katse Dam in Lesotho. An 8 m<sup>3</sup> block of concrete was cast and instrumented to monitor temperatures at various positions in the block over approximately 9 days after casting. The results show that the proposed model is able to predict the temperature at internal points in the concrete block to within 2 <sup>o</sup>C of the measured values.
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