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In this study, the effect of partial substitutions of Natural Coarse Aggregates (NCA) with Recycled Coarse Aggregates (RCA) and Ordinary Portland Cement (OPC) with Fly Ash (FA) was investigated in Self Compacting Concrete (SCC), after exposure to sodium sulphate solutions (2.0 and 8.0 g/l) for 28, 120, 365 and 540 days, along with CO2 emissions. A total binder content of 465 kg/m3 was used for three different SCC mixes with a water/binder ratio of 0.43. The Control Mix [OPC (100%)] is referred to as CM, while the other mixes are referred to as Mix-FA25 [OPC(75%) + FA(25%) + NCA(100%)] and Mix-FA25RCA25 [OPC(75%) + FA(25%) + NCA(75%) + RCA(25%)]. Micro-structural changes in SCC mixtures resulting from sulphate attack were investigated using analytical techniques such as X-ray Diffraction (XRD) and Scanning Electron Microscopy (SEM). The deterioration in compressive strength of CM, Mix-FA25 and Mix-FA25RCA25 exposed to 2.0 and 8.0 g/l sulphate solutions is in the range of 1.57–6.38% upto 540 days of exposure, in comparison to it’s corresponding strength in normal tap-water. Also, the decrease in CO2 emissions is between 22.10 and 23.63%, when OPC and NCA are replaced by FA and RCA, respectively. The study revealed that SCC mixtures containing RCA and FA (Mix-FA25RCA25) exhibited a relatively smaller reduction in strength due to sulphate attack. This mixture not only offers enhanced strength and cost-effectiveness but also contributes to environmental protection, distinguishing it from other mixtures such as CM and Mix-FA25.

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Sustainable Self Compacting Concrete with Recycled Coarse Aggregate and Fly Ash

  • 会议论文

  • 发表日期：

    2025年

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  • Rakesh Kumar,
  • Anjali Singh,
  • P. K. Mehta

摘要

In this study, the effect of partial substitutions of Natural Coarse Aggregates (NCA) with Recycled Coarse Aggregates (RCA) and Ordinary Portland Cement (OPC) with Fly Ash (FA) was investigated in Self Compacting Concrete (SCC), after exposure to sodium sulphate solutions (2.0 and 8.0 g/l) for 28, 120, 365 and 540 days, along with CO2 emissions. A total binder content of 465 kg/m3 was used for three different SCC mixes with a water/binder ratio of 0.43. The Control Mix [OPC (100%)] is referred to as CM, while the other mixes are referred to as Mix-FA25 [OPC(75%) + FA(25%) + NCA(100%)] and Mix-FA25RCA25 [OPC(75%) + FA(25%) + NCA(75%) + RCA(25%)]. Micro-structural changes in SCC mixtures resulting from sulphate attack were investigated using analytical techniques such as X-ray Diffraction (XRD) and Scanning Electron Microscopy (SEM). The deterioration in compressive strength of CM, Mix-FA25 and Mix-FA25RCA25 exposed to 2.0 and 8.0 g/l sulphate solutions is in the range of 1.57–6.38% upto 540 days of exposure, in comparison to it’s corresponding strength in normal tap-water. Also, the decrease in CO2 emissions is between 22.10 and 23.63%, when OPC and NCA are replaced by FA and RCA, respectively. The study revealed that SCC mixtures containing RCA and FA (Mix-FA25RCA25) exhibited a relatively smaller reduction in strength due to sulphate attack. This mixture not only offers enhanced strength and cost-effectiveness but also contributes to environmental protection, distinguishing it from other mixtures such as CM and Mix-FA25.