Abstract
This study is part of a pre-normative research (BBRI/CRIC-OCCN/BRRC) to underpin the use of recycled concrete aggregates (RCA) in the production of ready-mixed concrete in the Belgian concrete standard (NBN B15-001). Therefore, mechanical and durability properties of concrete incorporating coarse recycled concrete aggregates, originating from different recycling plants, have been assessed.
Recycled aggregates of maximal particle size 20 mm have been thoroughly characterized in order to evaluate their current quality and aptitude for use in concrete, with a special focus on resistance to freezing, quantification of floating material and chemical composition since there was few data available.
Six types of recycled aggregates were selected for further testing on concrete. Concrete mixes (23 in total) with a water to cement ratio of 0.50 and a cement content of 320 kg/m3 were produced, varying following parameters: type of RCA, replacement rate (0%, 20%, 30% and 50%), saturation state (dried, partially saturated and fully saturated) and type of cement (slag cement and ordinary Portland cement). The fresh and hardened properties of concrete were determined (slump, density, air content, compressive strength, modulus of elasticity, shrinkage and carbonation) in order to define the feasible but safe area of application for these RCA.
The results show that high quality recycled concrete aggregates can be produced and are suitable for use in concrete. This enables the production of concrete with relatively constant and predictable behaviour. Similar performance as reference concrete, even at high replacement rates, can be obtained.
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Acknowledgements
The authors would like to thank the FPS Economy for the financial support (PN14B19) and the recycling plants for providing their materials and expertise.
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Lauch, KS., Vrijders, J., Dooms, B. (2018). Defining Limits for Standardization on Concrete Incorporating Recycled Concrete Aggregates. In: Hordijk, D., Luković, M. (eds) High Tech Concrete: Where Technology and Engineering Meet. Springer, Cham. https://doi.org/10.1007/978-3-319-59471-2_267
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DOI: https://doi.org/10.1007/978-3-319-59471-2_267
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