Research on Frost Resistance of Hybrid Fiber Reinforced Concrete Based on Fractal Theory of Pore Structure

Abstract

Abstract: In order to study the influence of fly ash content on the frost resistance of steel-polypropylene reinforced concrete, five kinds of hybrid fiber concrete with fly ash replacement rate were designed and prepared. The freeze-thaw cycle and salt-freeze cycle tests of concrete were carried out, the law of mass loss, dynamic modulus and bending toughness of the concrete as freeze-thaw cycles increase had been analyzed. Based on the thermo-dynamic model, the pore structure fractal dimension of concrete before and after freeze-thaw was calculated, and the relationship between fractal dimension and concrete bending toughness was established. The results show that when the fly ash content ranges from 5% to 15%, with the increase of fly ash content, the frost resistance of hybrid fiber concrete is improved obviously. With the increase of fly ash content to 20%, the residual flexural toughness of hybrid fiber concrete begins to decrease. The internal pores of hybrid fiber concrete have obvious fractal characteristics, and the fractal dimension has good linear correlation with the total pore proportion of harmless and less harmful pores and the pore proportion of more harmful pores. At the same time, the fractal dimension of the fiber reinforced concrete is positively correlated with the peak load and energy absorption value. The larger the fractal dimension is, the higher the peak load and energy absorption value the concrete can bear will be.

Key words: concrete, hybrid fiber, fly ash, freeze-thaw cycle, fractal dimension, bending toughness

CLC Number:

U414

WANG Chunxiao, DONG Jianming, LI Desheng. Research on Frost Resistance of Hybrid Fiber Reinforced Concrete Based on Fractal Theory of Pore Structure[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(11): 3608-3616.

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