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<p>Chloride induced corrosion is a primary durability concern for reinforced concrete (RC) structures in marine environments, where premature corrosion of embedded reinforcement can shorten the service life of structures and compromise structural integrity. Traditional service life models account for the time-dependent reduction in chloride diffusivity by using the aging exponent (m), which is a crucial yet highly variable parameter influenced by binder composition, degree of hydration and pozzolanic reactions. This study investigates the aging exponents of 28 customized concrete mixes incorporating varying proportions of fly-ash and slag, with water-to-cementitious (w/c) materials ratio ranging from 0.33 to 0.55. Three different measurement techniques—rapid chloride migration, electrical resistivity and rapid chloride permeability tests—were used to evaluate chloride transport properties up to 365&#xa0;days. The results indicate significant variability in <i>m</i>-values across different binder compositions, with fly-ash based mixes exhibiting considerably superior behavior. Empirical correlations were established between the key physiochemical parameters and the aging exponents, and the proposed model was calibrated using the experimental data. The model performance was evaluated against a set of data from different studies. Most of the validation data falls within the 95% prediction interval for the model, with satisfactory statistical significance. The findings underscore the potential of chemical constituent-based models in rapidly and economically evaluating the aging exponents of concrete mixes, thereby enhancing service life predictions and streamlining the durability assessment of RC structures.</p>

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On the aging exponent of concrete: a parametric study and prediction model

  • 期刊论文

  • 发表日期：

    2026年1月21日

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  • Sakib Hasnat,
  • Tanvir Manzur

摘要

Chloride induced corrosion is a primary durability concern for reinforced concrete (RC) structures in marine environments, where premature corrosion of embedded reinforcement can shorten the service life of structures and compromise structural integrity. Traditional service life models account for the time-dependent reduction in chloride diffusivity by using the aging exponent (m), which is a crucial yet highly variable parameter influenced by binder composition, degree of hydration and pozzolanic reactions. This study investigates the aging exponents of 28 customized concrete mixes incorporating varying proportions of fly-ash and slag, with water-to-cementitious (w/c) materials ratio ranging from 0.33 to 0.55. Three different measurement techniques—rapid chloride migration, electrical resistivity and rapid chloride permeability tests—were used to evaluate chloride transport properties up to 365 days. The results indicate significant variability in m-values across different binder compositions, with fly-ash based mixes exhibiting considerably superior behavior. Empirical correlations were established between the key physiochemical parameters and the aging exponents, and the proposed model was calibrated using the experimental data. The model performance was evaluated against a set of data from different studies. Most of the validation data falls within the 95% prediction interval for the model, with satisfactory statistical significance. The findings underscore the potential of chemical constituent-based models in rapidly and economically evaluating the aging exponents of concrete mixes, thereby enhancing service life predictions and streamlining the durability assessment of RC structures.