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<p>Sulphur-Infiltrated Concrete (SIC) is an improved method for enhancing the mechanical and durability properties of concrete through sulphur infiltration, with comparative studies conducted using polypropylene (PP) fiber. This experimental study evaluates the mechanical and microstructural properties of SIC using fiber and sulphur infiltration techniques. The research examines strength using conventional and non-destructive testing methods (Rebound Hammer and UPV), flexural strength, and durability characteristics of SIC specimens compared to control concrete. Microstructural analysis was performed using Scanning Electron Microscopy with Energy Dispersive X-ray Spectroscopy (SEM-EDX) and Fourier Transform Infrared Spectroscopy (FTIR) to understand the chemical interactions and structural changes. Results show that sulphur infiltration significantly enhances the mechanical properties of concrete. Average strength of conventional control concrete at 1&#xa0;day of curing and 1&#xa0;day of oven drying was 11.13&#xa0;N/mm², while the sulphur-infiltrated concrete (SIC) achieved strength of 33.43&#xa0;N/mm², showing an increase of approximately 200.45% whereas the Fiber Reinforced SIC showed a 164% increase in strength. Polypropylene fibers were added at 600&#xa0;g/m³, equal to approximately 0.025% of the total concrete mass by weight. SEM-EDX analysis showed uniform sulphur distribution within the concrete matrix, forming chemical bonds with the cement hydration products. FTIR spectroscopy confirmed the formation of new chemical compounds between sulphur and cement paste. The improved performance is due to sulphur’s ability to fill micro-voids, improve matrix density, and create additional bonding mechanisms. This research demonstrates the potential of SIC as a sustainable construction material with superior mechanical properties and durability characteristics.</p>

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Experimental investigation on mechanical and microstructural properties of sulphur-infiltrated concrete (SIC)

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年11月19日

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  • Gayatri Harshal Pathak,
  • Shrikant Charhate

摘要

Sulphur-Infiltrated Concrete (SIC) is an improved method for enhancing the mechanical and durability properties of concrete through sulphur infiltration, with comparative studies conducted using polypropylene (PP) fiber. This experimental study evaluates the mechanical and microstructural properties of SIC using fiber and sulphur infiltration techniques. The research examines strength using conventional and non-destructive testing methods (Rebound Hammer and UPV), flexural strength, and durability characteristics of SIC specimens compared to control concrete. Microstructural analysis was performed using Scanning Electron Microscopy with Energy Dispersive X-ray Spectroscopy (SEM-EDX) and Fourier Transform Infrared Spectroscopy (FTIR) to understand the chemical interactions and structural changes. Results show that sulphur infiltration significantly enhances the mechanical properties of concrete. Average strength of conventional control concrete at 1 day of curing and 1 day of oven drying was 11.13 N/mm², while the sulphur-infiltrated concrete (SIC) achieved strength of 33.43 N/mm², showing an increase of approximately 200.45% whereas the Fiber Reinforced SIC showed a 164% increase in strength. Polypropylene fibers were added at 600 g/m³, equal to approximately 0.025% of the total concrete mass by weight. SEM-EDX analysis showed uniform sulphur distribution within the concrete matrix, forming chemical bonds with the cement hydration products. FTIR spectroscopy confirmed the formation of new chemical compounds between sulphur and cement paste. The improved performance is due to sulphur’s ability to fill micro-voids, improve matrix density, and create additional bonding mechanisms. This research demonstrates the potential of SIC as a sustainable construction material with superior mechanical properties and durability characteristics.