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<p>This study investigates the mechanical and durability performance of pervious concrete incorporating alkali-resistant glass fibers and subjected to short-term CO<sub>2</sub> curing. Response surface methodology (RSM) was employed to develop predictive models for compressive strength, split tensile strength, permeability, and carbonation depth with fiber volume fraction (0.1–0.9%), fiber lengths (6&#xa0;mm and 12&#xa0;mm), and carbonation durations (1-4&#xa0;h) as variables. Results indicate that incorporating 6-mm fibers increase the compressive strength up to 26.6% and split tensile strength up to 72%. For 12-mm fibers, compressive and tensile strengths improved by 10.3% and 100%, respectively. Beyond 0.5%, strength gains diminished. Four&#xa0;hours of CO<sub>2</sub> curing enhanced performance through matrix densification, yielding up to 10% improvement in compressive strength, 18% in tensile strength, with 20% reduction in permeability. Glass fiber addition combined with CO<sub>2</sub> curing enhanced the flexural performance of pervious concrete, achieving up to 60% higher flexural strength and markedly improved toughness at 0.7% fiber content. The RSM-based predictive models exhibited high accuracy, with <i>R</i><sup>2</sup> values ranging from&#xa0;0.832 to 0.946. Error analysis confirmed the models’ reliability, showing a very low percent bias (PBIAS) of &lt;  ± 3% for all responses, indicating minimal deviation between predicted and experimental values. Monte Carlo simulations demonstrated that compressive strength satisfied process capability at a ± 10% tolerance, while other properties required ± 15%. The study concludes that an optimal fiber content of 0.25-0.50%&#xa0;with&#xa0;1.5-3.5&#xa0;h of CO<sub>2</sub>curing for 6&#xa0;mm fibers and 0.35-0.50%&#xa0;with&#xa0;1.0-2.5 hours&#xa0;for 12&#xa0;mm fibers provides the best balance between strength, permeability, and carbonation resistance.</p>

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Predictive Modeling of Synergistic Effects of Glass Fibers and CO2 Curing on the Strength and Durability of Pervious Concrete

  • 期刊论文

  • 发表日期：

    2025年12月18日

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  • Aijaz Hussain Bhat,
  • Shashi Kant Sharma

摘要

This study investigates the mechanical and durability performance of pervious concrete incorporating alkali-resistant glass fibers and subjected to short-term CO2 curing. Response surface methodology (RSM) was employed to develop predictive models for compressive strength, split tensile strength, permeability, and carbonation depth with fiber volume fraction (0.1–0.9%), fiber lengths (6 mm and 12 mm), and carbonation durations (1-4 h) as variables. Results indicate that incorporating 6-mm fibers increase the compressive strength up to 26.6% and split tensile strength up to 72%. For 12-mm fibers, compressive and tensile strengths improved by 10.3% and 100%, respectively. Beyond 0.5%, strength gains diminished. Four hours of CO2 curing enhanced performance through matrix densification, yielding up to 10% improvement in compressive strength, 18% in tensile strength, with 20% reduction in permeability. Glass fiber addition combined with CO2 curing enhanced the flexural performance of pervious concrete, achieving up to 60% higher flexural strength and markedly improved toughness at 0.7% fiber content. The RSM-based predictive models exhibited high accuracy, with R2 values ranging from 0.832 to 0.946. Error analysis confirmed the models’ reliability, showing a very low percent bias (PBIAS) of <  ± 3% for all responses, indicating minimal deviation between predicted and experimental values. Monte Carlo simulations demonstrated that compressive strength satisfied process capability at a ± 10% tolerance, while other properties required ± 15%. The study concludes that an optimal fiber content of 0.25-0.50% with 1.5-3.5 h of CO2curing for 6 mm fibers and 0.35-0.50% with 1.0-2.5 hours for 12 mm fibers provides the best balance between strength, permeability, and carbonation resistance.