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Correlation between pore structure and macro durability of road concrete under load and freeze-thaw dry wet cycle

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Document pages: 6 pages

Abstract: Using the grey correlation theory and multiple regression method, the macro performance degradation law of road concrete under load, freeze-thaw and dry wet cycle is revealed; Then the relationship between the micro pore structure of concrete and the residual strength and frost resistance index is analyzed. Under the condition of freeze-thaw dry wet cycle at 50 load level, the pore structure parameters affecting concrete strength are as follows: fractal dimension > maximum possible pore size > porosity > minimum harmful pore. The relationship between strength and pore parameters can be expressed by multiple nonlinear equations. The intensity is negatively correlated with fractal dimension and maximum possible aperture. On the contrary, the positive correlation is shwn between strength, porosity, and less harmful pore. Under the freeze-thaw and drying-wetting cycles with 80 loading level, the pore structure parameters that influence concrete strength show another sequence: fractal dimension > porosity > less harmful pore > most probable pore size. The correlation between antifreezing index and pore parameters should be described with multiple linear equations. The relative dynamic elastic modulus shows a positive correlation to most probable pore size, pore surface area, and porosity but a negative correlation to less harmful pore and pore spacing coefficient.

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