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<p>In order to minimise carbon footprint associated with the manufacturing of OPC, blending of&#xa0;cement with industry by-products is essential. In that regard, high-volume ground granulated blast furnace slag (GGBS) concrete is the attention of the researchers. Extensive literature is available indicating that such blending imparts good durability and mechanical properties to the mix&#xa0;with major drawbacks of slow early development of the compressive strength and weaker carbonation resistance. However, it is noticed that the researchers have worked either on GGBS paste, mortar, or concrete. Further, limited research is reported on the improvement of carbonation resistance of GGBS concrete. In the present study, calcium nitrate (CN) in varied contents as a chemical admixture is incorporated into GGBS concrete and its impact on compressive and split tensile strength, rapid chloride ion penetration test (RCPT), water permeability test (WPT), and carbonation resistance is evaluated. The finding indicates that 0.5% calcium nitrate is an optimum dose to accelerate the hydration process and also achieves higher carbonation resistance. It is observed that the GGBS concrete is deficient in attaining early strength, and the addition of calcium nitrate eliminates completely the deficiency while also imparting better durability properties. Notably the depth of carbonation is reduced from 6&#xa0;mm to 2.5&#xa0;mm at 90&#xa0;days, 8&#xa0;mm to 3.2&#xa0;mm at 120&#xa0;days, and 8.8&#xa0;mm to 3.8&#xa0;mm at 150&#xa0;days for 0.5% content of CN. Further SEM, XRD, and EDS are employed to confirm the presence of hydrated products in the concrete.</p>

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Influence of calcium nitrate on the development of compressive strength and carbonation resistance of GGBS concrete

  • 期刊论文

  • 发表日期：

    2025年6月20日

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  • R. A. Joshi,
  • S. G. Joshi,
  • S. N. Londhe,
  • Ujwal Kunte

摘要

In order to minimise carbon footprint associated with the manufacturing of OPC, blending of cement with industry by-products is essential. In that regard, high-volume ground granulated blast furnace slag (GGBS) concrete is the attention of the researchers. Extensive literature is available indicating that such blending imparts good durability and mechanical properties to the mix with major drawbacks of slow early development of the compressive strength and weaker carbonation resistance. However, it is noticed that the researchers have worked either on GGBS paste, mortar, or concrete. Further, limited research is reported on the improvement of carbonation resistance of GGBS concrete. In the present study, calcium nitrate (CN) in varied contents as a chemical admixture is incorporated into GGBS concrete and its impact on compressive and split tensile strength, rapid chloride ion penetration test (RCPT), water permeability test (WPT), and carbonation resistance is evaluated. The finding indicates that 0.5% calcium nitrate is an optimum dose to accelerate the hydration process and also achieves higher carbonation resistance. It is observed that the GGBS concrete is deficient in attaining early strength, and the addition of calcium nitrate eliminates completely the deficiency while also imparting better durability properties. Notably the depth of carbonation is reduced from 6 mm to 2.5 mm at 90 days, 8 mm to 3.2 mm at 120 days, and 8.8 mm to 3.8 mm at 150 days for 0.5% content of CN. Further SEM, XRD, and EDS are employed to confirm the presence of hydrated products in the concrete.