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<p>Recent civil infrastructure projects require lightweight, corrosion-resistant and high-performance materials, which motivates researchers to develop and explore alternative materials to conventional construction materials. In particular, conventional steel rebars perform well in concrete; however, they prone to corrosion, possess heavy weight and require frequent maintenance in aggressive environments. Moreover, the existing alternate reinforcements such as FRP bar, aluminium bar, bamboo and stainless steel rebars have failed to gain significant interest among constructors, primarily due to concerns related to strength, stiffness, cost and bonding behavior. This study aims to solve the present need for innovative rebar for concrete by developing and characterizing aluminium metal matrix composites (AMMCs) using Al7075 alloy reinforced with Silicon Carbide (SiC) and fly ash, thereby evaluating their potential application as reinforcement bars in concrete structures. Three different materials, namely (i) Al7075, (ii) Al7075 + 7.5% SiC + 2.5% fly ash and (iii) Al7075 + 7.5% SiC + 2.5% fly ash (quadrimodal) composite incorporating four distinct SiC particle sizes in a 1:1:1:3 ratio were developed using the stir casting technique. Their mechanical properties like yield strength, ultimate tensile strength (UTS), Young’s modulus, % elongation and hardness and their results are compared against the standards specified in IS: 456–2000, IS: 432–1982, IS: 1786–2008 and ASTM A615/A615M-22. The addition of SiC particles with sizes of 10&#xa0;μm, 54&#xa0;μm, 86&#xa0;μm, and 146&#xa0;μm in a 1:1:1:3 ratio with fly ash into Al7075 alloy increases the yield strength, UTS, % elongation, and Young’s modulus by 226%, 178%, 3.1% and 21.4%, respectively. The findings indicate that the mechanical properties of the Al7075 alloy and Al7075 + 7.5% SiC + 2.5% fly ash composite did not satisfy the permissible limits of standard codes and were inadequate for structural concrete applications. However, the mechanical properties of the Al7075 + 7.5% SiC + 2.5% fly ash (quadrimodal) composite exhibit superior mechanical properties and satisfy the permissible limits of standard codes. Their yield strength, UTS, Young’s modulus and % elongation values were measured as 610&#xa0;MPa, 780&#xa0;MPa, 210 GPa and 11.5%. Further, these values are found to be closely aligned with the standard Fe500 steel rebar properties, which typically have a yield strength of 500&#xa0;MPa, a UTS of 565&#xa0;MPa-600&#xa0;MPa and a Young’s modulus of 200 GPa–210 GPa. The findings concluded that the Al7075-based AMMCs, especially Al7075 + 7.5% SiC + 2.5% fly ash (quadrimodal) composite was a promising alternative to conventional steel bars used in reinforced concrete applications.</p>

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Experimental Investigation on Al7075-Based Aluminium Metal Matrix Composites for Concrete Reinforcement Applications

  • 期刊论文

  • 发表日期：

    2025年10月15日

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  • J. Amirtharaj,
  • A. Leema Rose

摘要

Recent civil infrastructure projects require lightweight, corrosion-resistant and high-performance materials, which motivates researchers to develop and explore alternative materials to conventional construction materials. In particular, conventional steel rebars perform well in concrete; however, they prone to corrosion, possess heavy weight and require frequent maintenance in aggressive environments. Moreover, the existing alternate reinforcements such as FRP bar, aluminium bar, bamboo and stainless steel rebars have failed to gain significant interest among constructors, primarily due to concerns related to strength, stiffness, cost and bonding behavior. This study aims to solve the present need for innovative rebar for concrete by developing and characterizing aluminium metal matrix composites (AMMCs) using Al7075 alloy reinforced with Silicon Carbide (SiC) and fly ash, thereby evaluating their potential application as reinforcement bars in concrete structures. Three different materials, namely (i) Al7075, (ii) Al7075 + 7.5% SiC + 2.5% fly ash and (iii) Al7075 + 7.5% SiC + 2.5% fly ash (quadrimodal) composite incorporating four distinct SiC particle sizes in a 1:1:1:3 ratio were developed using the stir casting technique. Their mechanical properties like yield strength, ultimate tensile strength (UTS), Young’s modulus, % elongation and hardness and their results are compared against the standards specified in IS: 456–2000, IS: 432–1982, IS: 1786–2008 and ASTM A615/A615M-22. The addition of SiC particles with sizes of 10 μm, 54 μm, 86 μm, and 146 μm in a 1:1:1:3 ratio with fly ash into Al7075 alloy increases the yield strength, UTS, % elongation, and Young’s modulus by 226%, 178%, 3.1% and 21.4%, respectively. The findings indicate that the mechanical properties of the Al7075 alloy and Al7075 + 7.5% SiC + 2.5% fly ash composite did not satisfy the permissible limits of standard codes and were inadequate for structural concrete applications. However, the mechanical properties of the Al7075 + 7.5% SiC + 2.5% fly ash (quadrimodal) composite exhibit superior mechanical properties and satisfy the permissible limits of standard codes. Their yield strength, UTS, Young’s modulus and % elongation values were measured as 610 MPa, 780 MPa, 210 GPa and 11.5%. Further, these values are found to be closely aligned with the standard Fe500 steel rebar properties, which typically have a yield strength of 500 MPa, a UTS of 565 MPa-600 MPa and a Young’s modulus of 200 GPa–210 GPa. The findings concluded that the Al7075-based AMMCs, especially Al7075 + 7.5% SiC + 2.5% fly ash (quadrimodal) composite was a promising alternative to conventional steel bars used in reinforced concrete applications.