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Durable Structural Recycled Concrete for Different Exposure Environments
Carla Vintimilla1, Miren Etxeberria1
1Department of Civil and Environmental Engineering, Campus Nord, Universitat Politècnica de Catalunya·Barcelona TECH, 08034 Barcelona, Spain.
Materials (Basel, Switzerland)
|February 13, 2025
Summary
Recycled concrete aggregates (RAC) can be used in structural concrete, showing good durability against carbonation and chloride penetration, especially when using CEM III/B cement. This validates RAC for corrosive environments.
Area of Science:
- Civil Engineering
- Materials Science
- Sustainable Construction
Background:
- Limited use of recycled concrete aggregates (CRCA and FRCA) in structural concrete due to durability concerns.
- Need for performance data on recycled aggregate concrete (RAC) in various environmental conditions.
Purpose of the Study:
- To analyze the durability properties of structural concrete incorporating CRCA and FRCA.
- To evaluate the influence of different cement types on RAC performance.
- To validate RAC suitability for specific corrosive environments (XC and XS1).
Main Methods:
- Designed RAC mixtures with varying percentages of CRCA (50-60%) and FRCA (0-20%).
- Utilized different cement types (CEM II/AL, CEM II/AS, CEM III/B) and water-cement ratios (0.47-0.5).
- Assessed durability through drying shrinkage, chloride permeability, chloride penetration depth, and carbonation rates (accelerated and natural).
Main Results:
- RAC with 60% CRCA and 20% FRCA using CEM III/B showed low chloride ion penetrability (<850 Coulombs) and low diffusion coefficient (7 × 10-13).
- RAC mixtures with CEM II/AS demonstrated suitability for XC3/XC4 environments, predicting 50-100 year lifespans based on natural carbonation.
- RAC with CEM II/AL exhibited adequate natural carbonation rates for XC4 environments.
Conclusions:
- Recycled aggregate concrete (RAC) demonstrates acceptable durability for structural applications.
- Specific RAC mixtures and cement types (CEM III/B, CEM II/AS) are suitable for corrosive environments (XC and XS1).
- This study validates the use of RAC in environments prone to carbonation and chloride-induced corrosion.
Keywords:
cement types (CEM II/AL, CEM II/AS, CEM III/B)chloride diffusionchloride permeabilitycoarse and fine aggregatesnatural and accelerated carbonationsupplementary cementitious materialsMore Related Videos
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