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Addressing the twin goals of structural efficiency and environmental sustainability in construction calls for the development of multifunctional concretes. This study evaluates self-compacting lightweight fibre-reinforced concretes (SCLFRC) incorporating two expanded-perlite fine aggregates and polypropylene fibres. Four optimized mixtures were selected on the basis of fresh-state properties and compressive strength, following European standard procedures. Fresh densities were ≤2000 kg/m3. Mechanical testing showed that fibre-reinforced concretes had higher tensile capacity and stiffness than their non-reinforced counterparts. The fibre-reinforced mixture with perlite type B reached the highest indirect tensile strength (3.24 MPa) and elastic modulus (31.64 GPa).To complement the mechanical programme, a cradle-to-gate Life Cycle Assessment was performed in accordance with EN 15804 and ISO 14040/44 to quantify environmental impacts. The Global Warming Potential was 269.97, 287.56, 289.19, and 297.46 kgCO₂e/m3 for the control mixture with perlite type A, the control mixture with perlite type B, the fibre-reinforced mixture with perlite type A, and the fibre-reinforced mixture with perlite type B, respectively. The binder was the main contributor to impacts in stages A1–A3, while transport and plant energy were secondary contributors. When impacts are interpreted in terms of “performance per impact,” the fibre-reinforced mixture based on perlite type A preserves the strength efficiency of its corresponding control mixture, and the fibre-reinforced mixture based on perlite type B improves upon its control counterpart. Therefore, the selection of perlite type and fibre dosage can be adjusted to suit the governing design criterion (stiffness/crack control versus compressive strength) with a bounded increase in GWP. This integrated assessment supports the use of SCLFRC as a sustainable material for structural applications. Its lightweight character, mechanical reliability, and improved environmental profile make it suitable for slabs, bridge decks, and precast elements where weight reduction and durability are critical.

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Self-compacting Lightweight Concrete Reinforced with Polypropylene Fibres: Highlighting Mechanical Behavior and Life Cycle Assessment

  • 会议论文

  • 发表日期：

    2026年

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  • Samantha Hidalgo-Astudillo,
  • Natividad Garcia-Troncoso,
  • Nadia Quijano-Arteaga,
  • Antonio Aguado,
  • Nikola Tošić,
  • Albert de la Fuente Antequera

摘要

Addressing the twin goals of structural efficiency and environmental sustainability in construction calls for the development of multifunctional concretes. This study evaluates self-compacting lightweight fibre-reinforced concretes (SCLFRC) incorporating two expanded-perlite fine aggregates and polypropylene fibres. Four optimized mixtures were selected on the basis of fresh-state properties and compressive strength, following European standard procedures. Fresh densities were ≤2000 kg/m3. Mechanical testing showed that fibre-reinforced concretes had higher tensile capacity and stiffness than their non-reinforced counterparts. The fibre-reinforced mixture with perlite type B reached the highest indirect tensile strength (3.24 MPa) and elastic modulus (31.64 GPa).To complement the mechanical programme, a cradle-to-gate Life Cycle Assessment was performed in accordance with EN 15804 and ISO 14040/44 to quantify environmental impacts. The Global Warming Potential was 269.97, 287.56, 289.19, and 297.46 kgCO₂e/m3 for the control mixture with perlite type A, the control mixture with perlite type B, the fibre-reinforced mixture with perlite type A, and the fibre-reinforced mixture with perlite type B, respectively. The binder was the main contributor to impacts in stages A1–A3, while transport and plant energy were secondary contributors. When impacts are interpreted in terms of “performance per impact,” the fibre-reinforced mixture based on perlite type A preserves the strength efficiency of its corresponding control mixture, and the fibre-reinforced mixture based on perlite type B improves upon its control counterpart. Therefore, the selection of perlite type and fibre dosage can be adjusted to suit the governing design criterion (stiffness/crack control versus compressive strength) with a bounded increase in GWP. This integrated assessment supports the use of SCLFRC as a sustainable material for structural applications. Its lightweight character, mechanical reliability, and improved environmental profile make it suitable for slabs, bridge decks, and precast elements where weight reduction and durability are critical.