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The bond between aggregate particles and the cement matrix is significantly influenced by the shape and surface texture of the aggregates. High-strength concretes benefit from a rougher texture, which leads to stronger bonding due to greater adhesion. Angular aggregates with larger surface areas also enhance this bond. The bonding quality, however, is complex to assess as no universally accepted test exists. Good bonding is indicated when a crushed concrete specimen shows some aggregate...
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Recycled Concrete Aggregate for Medium-Quality Structural Concrete.

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  • 1Department of Civil Engineering, Industrial University of Ho Chi Minh City, Ho Chi Minh City 70000, Vietnam.

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Summary

Recycled coarse aggregate (RCA) in concrete shows minimal impact on mechanical and durability properties. However, high RCA content significantly reduces workability and increases porosity, affecting sound transmission.

Keywords:
abrasiondurabilityrecycled coarse aggregaterecycled concreteultrasound pulse velocitywater absorptionworkability

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Area of Science:

  • Civil Engineering
  • Materials Science
  • Sustainable Construction

Background:

  • Growing demand for construction materials necessitates sustainable alternatives.
  • Recycled coarse aggregate (RCA) offers a potential solution for waste reduction in concrete production.
  • Evaluating RCA's impact on concrete properties is crucial for its widespread adoption.

Purpose of the Study:

  • To assess the properties of medium-quality concrete with varying percentages of recycled coarse aggregate (RCA).
  • To investigate the effects of RCA on concrete's workability, mechanical strength, and durability.
  • To analyze the relationship between concrete porosity, ultrasound pulse velocity (UPV), and compressive strength.

Main Methods:

  • Preparation of concrete specimens with 25%, 50%, 75%, and 100% RCA replacement.
  • Evaluation of workability, mechanical properties (e.g., compressive strength), and abrasion resistance at different ages.
  • Measurement of ultrasound pulse velocity (UPV) to assess concrete porosity and internal structure.

Main Results:

  • Mechanical properties and abrasion resistance of recycled concrete (RC) were comparable to reference concrete.
  • Workability significantly decreased with 75% and 100% RCA replacement.
  • RC exhibited higher porosity, especially at the RCA-paste interface, leading to lower UPV.

Conclusions:

  • RCA can be incorporated into concrete with minimal compromise on mechanical and durability performance.
  • High RCA content negatively impacts workability and increases porosity.
  • A predictive equation linking compressive strength and UPV was developed, offering insights into concrete quality assessment.