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<p>The excessive accumulation of construction and demolition waste in landfills has become an urgent environmental problem, especially due to the potential leaching of heavy metals into the surrounding environment. In response to this problem, this study incorporated recycled concrete waste (RCW) as an additive based on the weight of the coarse aggregate. This study investigates the physical, mechanical, and microstructural properties of concrete incorporating RCW at addition levels of 2%, 4%, 6%, and 8% by weight of coarse aggregate, focusing on assigning its application in structural or non-structural elements. The experimental design targeted a minimum compressive strength of 21&#xa0;MPa with a water-to-cement ratio of 0.53, without the use of superplasticizers. Cylindrical and prismatic specimens were tested after 7 and 28 days of curing. The results showed that a higher RCW content slightly reduced the concrete’s temperature and unit weight while increasing workability and air content. The optimal mechanical performance was observed with a 2% RCW addition level, which resulted in improvements of 3.84% in compressive strength, 6.25% in tensile strength, 15.32% in flexural strength, and 4.90% in the modulus of elasticity compared to the reference concrete. Microstructural analysis using X-ray diffraction (XRD) identified beneficial mineral phases, such as calcite and aluminosilicates, while scanning electron microscopy (SEM) combined with energy-dispersive spectroscopy (EDS) revealed greater structural homogeneity. These properties make RCW-incorporated concrete suitable for non-structural applications, including sports courts, sidewalks, curbs, pavements, parking lots, pedestrian pathways, and non-load-bearing partition walls. The use of RCW in these non-structural elements supports sustainable construction practices by reducing landfill waste and promoting resource efficiency. This research contributes to the United Nations Sustainable Development Goals (SDGs), specifically SDG 11 (Sustainable Cities and Communities), SDG 12 (Responsible Consumption and Production), and SDG 13 (Climate Action), by advancing waste valorization and environmentally responsible construction.</p>

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Effect of recycled concrete waste on the improvement of physical, mechanical and microstructural properties of structural concrete

  • 期刊论文

  • 发表日期：

    2025年11月19日

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  • Jhon Denis Huaman Marcelo,
  • Milin Kely Vega Julca,
  • Juan Martín García Chumacero,
  • Carlos Ovidio Chavez Cotrina,
  • Néstor Raúl Salinas Vásquez

摘要

The excessive accumulation of construction and demolition waste in landfills has become an urgent environmental problem, especially due to the potential leaching of heavy metals into the surrounding environment. In response to this problem, this study incorporated recycled concrete waste (RCW) as an additive based on the weight of the coarse aggregate. This study investigates the physical, mechanical, and microstructural properties of concrete incorporating RCW at addition levels of 2%, 4%, 6%, and 8% by weight of coarse aggregate, focusing on assigning its application in structural or non-structural elements. The experimental design targeted a minimum compressive strength of 21 MPa with a water-to-cement ratio of 0.53, without the use of superplasticizers. Cylindrical and prismatic specimens were tested after 7 and 28 days of curing. The results showed that a higher RCW content slightly reduced the concrete’s temperature and unit weight while increasing workability and air content. The optimal mechanical performance was observed with a 2% RCW addition level, which resulted in improvements of 3.84% in compressive strength, 6.25% in tensile strength, 15.32% in flexural strength, and 4.90% in the modulus of elasticity compared to the reference concrete. Microstructural analysis using X-ray diffraction (XRD) identified beneficial mineral phases, such as calcite and aluminosilicates, while scanning electron microscopy (SEM) combined with energy-dispersive spectroscopy (EDS) revealed greater structural homogeneity. These properties make RCW-incorporated concrete suitable for non-structural applications, including sports courts, sidewalks, curbs, pavements, parking lots, pedestrian pathways, and non-load-bearing partition walls. The use of RCW in these non-structural elements supports sustainable construction practices by reducing landfill waste and promoting resource efficiency. This research contributes to the United Nations Sustainable Development Goals (SDGs), specifically SDG 11 (Sustainable Cities and Communities), SDG 12 (Responsible Consumption and Production), and SDG 13 (Climate Action), by advancing waste valorization and environmentally responsible construction.