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The need to reduce carbon emissions from cement production necessitates the development of more environmentally friendly construction methods. We studied the long-term corrosion behavior of steel rebar embedded in concrete with natural zeolite fine aggregate (ZS) and powder (ZP) as a partial substitution to reduce CO2 emissions from the concrete manufacturing sector and improve stable CO2 sequestration in the matrix of concrete under macrocell corrosion conditions for 365 days. The present study investigated the performance of rebar placed in concrete composed of 100% ordinary Portland cement (OPC) (NC) and 85% OPC + 15% ZP (ZC) under accelerated carbonation. Following the initial water curing for 28 days, the reinforced concrete samples were placed in a sodium bicarbonate (NaHCO3) solution with a concentration of 0.5 M. The carbonation depth measurement test was conducted to ascertain the degree of carbonation. The corrosion performance of steel rebar was assessed by measuring the macrocell corrosion current after each wet-dry cycle. Results showed NC had lower carbonation depth and macrocell corrosion current than ZC, indicating greater carbonation in ZC. Additionally, specimens cured with normal water had lower carbonation and macrocell corrosion current compared to those cured with the 0.5 M carbonated solution.

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Investigation of the Corrosion Resistance of Reinforced Zeolite Concrete under Accelerated Carbonation using Macrocell Corrosion Condition

  • 会议论文

  • 发表日期：

    2025年

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  • Akshay Ramesh Bura,
  • B. Kondraivendhan

摘要

The need to reduce carbon emissions from cement production necessitates the development of more environmentally friendly construction methods. We studied the long-term corrosion behavior of steel rebar embedded in concrete with natural zeolite fine aggregate (ZS) and powder (ZP) as a partial substitution to reduce CO2 emissions from the concrete manufacturing sector and improve stable CO2 sequestration in the matrix of concrete under macrocell corrosion conditions for 365 days. The present study investigated the performance of rebar placed in concrete composed of 100% ordinary Portland cement (OPC) (NC) and 85% OPC + 15% ZP (ZC) under accelerated carbonation. Following the initial water curing for 28 days, the reinforced concrete samples were placed in a sodium bicarbonate (NaHCO3) solution with a concentration of 0.5 M. The carbonation depth measurement test was conducted to ascertain the degree of carbonation. The corrosion performance of steel rebar was assessed by measuring the macrocell corrosion current after each wet-dry cycle. Results showed NC had lower carbonation depth and macrocell corrosion current than ZC, indicating greater carbonation in ZC. Additionally, specimens cured with normal water had lower carbonation and macrocell corrosion current compared to those cured with the 0.5 M carbonated solution.