Numerical Prediction Model for Temperature Distributions in Concrete at Early Ages

A finite element-finite difference numerical model is developed for predicting non-uniform temperature development in hydrating concrete with respect to time and space. The results obtained from this model can be used by structural and construction engineers to predict critical thermal stresses induced due to differential temperatures between the core and the surface of the concrete at early ages and between the zero-stress temperatures and the minimum equilibrating ambient temperatures that the concrete experiences during its service life. The prediction of zero-stress temperatures also enables to quantify the extent of built-in curl developed in concrete structures. The finite element is used to space discretization while the finite difference is used to obtain transient solutions of the model. The numerical formulations are then programmed in Matlab. The numerical results were compared with experimental results found in literature and demonstrated very good agreement.

[1]  Baolin Wang,et al.  Application of finite element-finite difference method to the determination of transient temperature field in functionally graded materials , 2005 .

[2]  Rui Faria,et al.  Modelling of concrete at early ages: Application to an externally restrained slab , 2006 .

[3]  T. Fwa,et al.  EFFECTS OF NONLINEAR TEMPERATURE DISTRIBUTION ON THERMAL STRESSES IN CONCRETE PAVEMENTS , 2003 .

[4]  Surendra P. Shah,et al.  Finite Element Modeling of Concrete Behavior at Early Age Modelagem por Elementos Finitos do Comportamento do Concreto nas Primeiras Idades , 2009 .

[5]  Roland W. Lewis,et al.  The Finite Element Method in Heat Transfer Analysis , 1996 .

[6]  Y. Ballim,et al.  A numerical model and associated calorimeter for predicting temperature profiles in mass concrete , 2004 .

[7]  A. Razaqpur,et al.  Finite element modeling of coupled heat transfer, moisture transport and carbonation processes in concrete structures , 2004 .

[8]  Robert Otto Rasmussen,et al.  Concrete pavement temperature prediction and case studies with the FHWA HIPERPAV models , 2004 .

[9]  Fernando A. Branco,et al.  Heat of Hydration Effects in Concrete Structures , 1992 .

[10]  J. Noorzaei,et al.  Development of finite element computer code for thermal analysis of roller compacted concrete dams , 2007, Adv. Eng. Softw..

[11]  Nelson F. F. Ebecken,et al.  Optimization of mass concrete construction using genetic algorithms , 2004 .

[12]  James P. Callan,et al.  Training algorithms for linear text classifiers , 1996, SIGIR '96.