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<p>This study conducted a thorough experimental program to examine the impact of various types of binders, natural zeolite powder (ZP), zeolite sand (ZS) addition, and two sodium bicarbonate (NaHCO<sub>3</sub>) solutions with varying molar concentrations (0.5&#xa0;M and 0.75&#xa0;M) used as an alternate accelerated carbonation technique on the mechanical performance, corrosion studies, and microstructural changes of all the concrete mixes. The primary binder was partially replaced with 15% ZP; similarly, 30% of the fine aggregate content was replaced by ZS. The compressive strength results of the concrete blended with ZP and ZS showed lower strength than normal concrete (without ZP and ZS blend). The carbonation depth measurement results showed that all concrete specimens made with ZP and ZS exposed to increasing molar concentrations of NaHCO<sub>3</sub> solution had significantly higher carbonation depth values. The corrosion results revealed that the reinforced concrete beam specimens prepared with ZP and ZS had higher corrosion current density (I<sub>corr</sub>) values than those prepared without ZP and ZS, regardless of binder type, water-to-binder (w/b) ratio, or accelerated carbonation exposure concentrations. Microstructural investigations indicated that the quantity of calcium carbonate (CaCO<sub>3</sub>) increased as the exposure duration of accelerated carbonation and the molar level of NaHCO<sub>3</sub> solution increased in all concrete mixtures during the carbonation process. The concrete mixture prepared with PSC, ZP, and ZS demonstrated superior performance when the extent of CaCO<sub>3</sub> content and I<sub>corr</sub> were combined. </p>

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Influence of zeolite additives and an innovative accelerated carbonation technique on the mechanical and corrosion properties of carbonated concrete

  • 期刊论文

  • 发表日期：

    2025年2月7日

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  • Akshay Ramesh Bura,
  • B. Kondraivendhan

摘要

This study conducted a thorough experimental program to examine the impact of various types of binders, natural zeolite powder (ZP), zeolite sand (ZS) addition, and two sodium bicarbonate (NaHCO3) solutions with varying molar concentrations (0.5 M and 0.75 M) used as an alternate accelerated carbonation technique on the mechanical performance, corrosion studies, and microstructural changes of all the concrete mixes. The primary binder was partially replaced with 15% ZP; similarly, 30% of the fine aggregate content was replaced by ZS. The compressive strength results of the concrete blended with ZP and ZS showed lower strength than normal concrete (without ZP and ZS blend). The carbonation depth measurement results showed that all concrete specimens made with ZP and ZS exposed to increasing molar concentrations of NaHCO3 solution had significantly higher carbonation depth values. The corrosion results revealed that the reinforced concrete beam specimens prepared with ZP and ZS had higher corrosion current density (Icorr) values than those prepared without ZP and ZS, regardless of binder type, water-to-binder (w/b) ratio, or accelerated carbonation exposure concentrations. Microstructural investigations indicated that the quantity of calcium carbonate (CaCO3) increased as the exposure duration of accelerated carbonation and the molar level of NaHCO3 solution increased in all concrete mixtures during the carbonation process. The concrete mixture prepared with PSC, ZP, and ZS demonstrated superior performance when the extent of CaCO3 content and Icorr were combined.