Temperature response and moisture transport in damaged concrete under an atmospheric environment

Abstract This paper presents an in-depth study of temperature response and moisture transport tests in damaged concrete under an atmospheric environment. Effects of concrete damage on thermal conductivity and temperature response were also investigated along with the effects of concrete damage on moisture transport caused by temperature gradient. The experimental results show that thermal conductivity of concrete decreases with the increasing damage level, and there is always a hysteresis effect for temperature response in damaged concrete. In addition, the temperature response rate in damaged concrete changes quickly at the beginning and decreases gradually with time. The greater the initial temperature difference is, the greater the initial temperature response rate is. When the temperature gradient exists on both sides of concrete, the moisture transport will occur in the heat transfer direction. Given the same initial temperature difference, the temperature response rate decreases slightly with the increasing damage level, while the moisture transport mass increases incrementally. Based on Fourier’s law and the principle of energy conservation, a temperature response model was established for cylindrical concrete. This model can be used to predict temperature response in concrete with different damage levels, and the predicted results are all in acceptable agreement with the experimental values. The calculated results show that the hysteresis time is related to thermal diffusivity, the initial temperature difference and the size of the concrete specimen. Finally, the effect of damage on temperature response increases with the increasing size of the concrete specimen.

[1]  A. Luikov.  Heat and Mass Transfer in Capillary-Porous Bodies , 2014 .

[2]  Yuan Ying-shu,et al.  Action spectrum of temperature in natural climate environment and prediction of temperature response in concrete , 2009 .

[3]  Renato Vitaliani,et al.  The carbonation of concrete and the mechanism of moisture, heat and carbon dioxide flow through porous materials , 1993 .

[4]  Yingshu Yuan,et al.  Prediction of temperature response in concrete in a natural climate environment , 2011 .

[5]  M. M. Nassar.  THE EFFECT OF ENVIRONMENTAL TEMPERATURE ON THE CORROSION OF REINFORCED CONCRETE , 1997 .

[6]  T. Liu,et al.  Modeling the Dynamic Corrosion Process in Chloride Contaminated Concrete Structures , 1998 .

[7]  P. Demo,et al.  The effect of temperature on strength – porosity relationship for concrete , 2004 .

[8]  T. Harmathy,et al.  THERMAL PROPERTIES OF SELECTED MASONRY UNIT CONCRETES , 1973 .

[9]  D. Campbell-Allen,et al.  The thermal conductivity of concrete , 1963 .

[10]  Xianglin Gu,et al.  Basic Principles of Concrete Structures , 2015 .

[11]  Sylvie Lorente,et al.  Effect of the environment temperature on the chloride diffusion through CEM-I and CEM-V mortars: An experimental study , 2009 .

[12]  Y. Xi,et al.  Composite Damage Models for Diffusivity of Distressed Materials , 2005 .

[13]  Furong Gao,et al.  Process control of reinforcement corrosion in concrete. Part 1: Effect of corrosion products , 2015 .

[14]  Vladimír Živica,et al.  Significance of the ambient temperature and the steel material in the process of concrete reinforcement corrosion , 1997 .

[15]  T Z Harmathy,et al.  THERMAL PROPERTIES OF CONCRETE AT ELEVATED TEMPERATURES , 1970 .

[16]  M. Fardis,et al.  Physical and Chemical Characteristics Affecting the Durability of Concrete , 1991 .

[17]  Mohammad Iqbal Khan,et al.  Factors affecting the thermal properties of concrete and applicability of its prediction models , 2002 .

[18]  Mohammad Pour-Ghaz,et al.  The effect of temperature on the corrosion of steel in concrete. Part 1: Simulated polarization resistance tests and model development , 2009 .

[19]  A. Luikov,et al.  Theory of energy and mass transfer , 1961 .

[20]  Adam Neville,et al.  Chloride attack of reinforced concrete: an overview , 1995 .

[21]  A. Campo.  Rapid determination of spatio-temporal temperatures and heat transfer in simple bodies cooled by convection: Usage of calculators in lieu of heisler-gröber charts , 1997 .

[22]  Jin-keun Kim,et al.  An experimental study on thermal conductivity of concrete , 2003 .

[23]  D.D.L. Chung,et al.  Increasing the specific heat of cement paste by admixture surface treatments , 1999 .

[24]  Simon A. Austin,et al.  Influence of diurnal and seasonal temperature variations on the detection of corrosion in reinforced concrete by acoustic emission , 2005 .

[25]  Cruz Alonso,et al.  Corrosion rate evolution in concrete structures exposed to the atmosphere , 2002 .

[26]  O. Isgor,et al.  The effect of temperature on the corrosion of steel in concrete. Part 2: Model verification and parametric study , 2009 .

[27]  Frank P. Incropera,et al.  Fundamentals of Heat and Mass Transfer , 1981 .

[28]  Sabine Caré,et al.  Effect of temperature on porosity and on chloride diffusion in cement pastes , 2008 .

[29]  L. Greenspan.  Humidity Fixed Points of Binary Saturated Aqueous Solutions , 1977, Journal of Research of the National Bureau of Standards. Section A, Physics and Chemistry.

[30]  Yunping Xi,et al.  Mesoscale model for thermal conductivity of concrete , 2015 .

[31]  E. Samson,et al.  Modeling the Effect of Temperature on Ionic Transport in Cementitious Materials , 2007 .