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<p>This study investigates the effects of using silicon carbide (SiC) as a partial replacement for aggregates in cement mortar at various levels (10, 20, 40, and 60%). The impact on mechanical, physical, and chemical properties was evaluated through compressive strength, flexural strength, water absorption, chloride permeability tests, and Scanning Electron Microscopy (SEM) analysis. The results revealed that replacing 10% of the aggregate with SiC led to a 10.87% increase in compressive strength and a 6.34% increase in flexural strength at 28&#xa0;days compared to the control sample. Moreover, chloride permeability was reduced by 29.6% at 7&#xa0;days, and water absorption decreased by 5.21%, indicating improved durability. At a 20% replacement level, minor improvements were still evident; however, performance began to decline beyond this threshold. For instance, 60% SiC replacement resulted in a 13.21% decrease in compressive strength and a 62.42% reduction in flexural strength, with increased water absorption and chloride permeability due to particle clustering and increased porosity. SEM analysis supported these findings, showing denser microstructures at low SiC content and deteriorated matrix integrity at higher levels. Overall, optimal enhancement in mechanical and durability performance was observed at 10-20% SiC replacement, making it a promising strategy for sustainable and high-performance cement-based materials.</p>

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Investigation of the Effects of Silicon Carbide Used as an Aggregate Replacement on the Properties of Cement Mortar

  • 期刊论文

  • 发表日期：

    2026年1月4日

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  • Ahmet Filazi,
  • Ahmet Mustafa Şenses,
  • Tuna Aydin,
  • Mehmet Kabalci

摘要

This study investigates the effects of using silicon carbide (SiC) as a partial replacement for aggregates in cement mortar at various levels (10, 20, 40, and 60%). The impact on mechanical, physical, and chemical properties was evaluated through compressive strength, flexural strength, water absorption, chloride permeability tests, and Scanning Electron Microscopy (SEM) analysis. The results revealed that replacing 10% of the aggregate with SiC led to a 10.87% increase in compressive strength and a 6.34% increase in flexural strength at 28 days compared to the control sample. Moreover, chloride permeability was reduced by 29.6% at 7 days, and water absorption decreased by 5.21%, indicating improved durability. At a 20% replacement level, minor improvements were still evident; however, performance began to decline beyond this threshold. For instance, 60% SiC replacement resulted in a 13.21% decrease in compressive strength and a 62.42% reduction in flexural strength, with increased water absorption and chloride permeability due to particle clustering and increased porosity. SEM analysis supported these findings, showing denser microstructures at low SiC content and deteriorated matrix integrity at higher levels. Overall, optimal enhancement in mechanical and durability performance was observed at 10-20% SiC replacement, making it a promising strategy for sustainable and high-performance cement-based materials.