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| Prediction on thermal expansion coefficient of concrete based on meso-mechanics method |
| Received:January 04, 2006 Revised:July 07, 2006 |
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| DOI：10.7511/jslx20076157 |
| KeyWord:meso-mechanics,concrete,aggregate,mortar,coefficient of thermal expansion |
| ZHANG Zi-ming ZHANG Yan SONG Zhi-tong |
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| Abstract: |
| Correlating the effective properties of concrete materials with their micro-structures is a basis for optimization of concrete materials.In this article,the stress field of infinite medium uniformly heated containing a spherical inclusion is obtained by use of the theorem of meso-mechanics to study the macroscopic effective coefficient of thermal expansion of concrete.Assume that the concrete is a two-phase composite composed of mortar and aggregate and that the quantity of the macroscopic volume expansion of concrete is equal to the total quantity of mesoscopic volume expansion of the two-phase medium of concrete.Using the macroscopic effective shear modulus of concrete based on method of Mori-Tanaka gives the solution of the macroscopic effective coefficient of thermal expansion of concrete.The comparison of the numerical results derived from dilute method,self-consistent method and finite element method,respectively,illustrates that the theoretical formula of macroscopic effective coefficient of thermal expansion of concrete based on the self-consistent method provided in this paper, can be applied to describe the thermodynamics behavior of concrete.This method can be used to predict the macroscopic effective coefficient of thermal expansion of multi-phase composites. |
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