Chloride Transport Performance at New-to-Old Concrete Interfaces with Controlled Roughness

doi:10.16552/j.cnki.issn1001-1625.2025.0704

Abstract

Abstract: Interface roughness and chloride transport at the new-to-old concrete interface are key factors governing the interface performance of precast concrete structures. In this paper, the fractal dimension was used as the overall roughness index, combined with the four sub-indexes of root mean square height (RMS), standard deviation (S_td), correlation-length and Hurst coefficient. The two-dimensional Gaussian surface was generated by Fourier transform, and the random-number matrix assignment was used to repeatedly construct 1 000 times. The comprehensive evaluation model of roughness was established by linear regression and multiple weight methods, and the influences of different roughness interfaces on chloride ion transport and corrosion behavior of rebars were analyzed by numerical simulation system. The results show that when RMS increase from 0.6 to 1.8,the time for chloride concentration at the rebar to reach the critical value of 0.4% (mass fraction) increases from 107 d to 120 d; when S_td increase from 0.6 to 1.8, this time for chloride concentration at the rebar to reach the critical value of 0.4% (mass fraction) increases from 108 d to 121 d, which shows that the increase of roughness significantly slows down the chloride ion penetration and corrosion rate. Overall, curved interface exhibits significantly stronger resistance to chloride ion erosion than plane interface. The higher the interface roughness between new-to-old concrete, the stronger the resistance of rebars to chloride ion erosion, and the structural durability and safety are significantly improved. The research results provide an important basis for the design of controllable roughness interface, the correction of life prediction model and the improvement of concrete structure durability theory.

Key words: new-to-old concrete, fractal dimension, interface roughness, controlled roughness, chloride transport performance, rebar corrosion

CLC Number:

TU528.1

ZHAO Jianghang, CHEN Banghui, HAN Huixuan, XU Jun. Chloride Transport Performance at New-to-Old Concrete Interfaces with Controlled Roughness[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2025, 44(11): 4000-4027.

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