Abstract
This research aims at evaluating the main risks for the durability of concrete made of industrially produced recycled aggregates called Recycled Aggregate Concrete (RAC). A characterisation of recycled aggregates is performed and their peculiarities are highlighted. A comparison between the behaviour of RAC and that of ordinary natural aggregate concrete is carried out. The influence of both the composition and the curing conditions is discussed.
The durability study is focused on the assessment of parameters representing the porous structure and concrete characteristics. Because of the high total water/cement ratio of RAC, their flow properties control their durability. It is established that RAC are characterised by significantly higher water absorption and air permeability. The diffusion of the carbon dioxide is faster, too. That leads to a weaker resistance of RAC to environmental attacks.
Since the main durability problems are caused by the fine recycled fraction, its use needs to be restricted. Another way to increase RAC durability seems to be the extended curing in wet environment.
Résumé
La recherche présentée dans ce papier a pour objectif d'évaluer la durabilité des bétons à base de granulats recyclés produits industriellement. La caractérisation des granulats recyclés est présentée en insistant sur leurs particularités. Une comparaison des performances des bétons de granulats naturels et recyclés est menée et l'influence de la composition et des conditions de cure est discutée.
L'étude de la durabilité est centrée sur l'évaluation de paramètres représentatifs de la structure poreuse et des caractéristiques du béton. En raison de l'importance du rapport eau totale/ciment, la durabilité est contrôlée par les facteurs de transfert: absorption d'eau et perméabilité à l'air élevées. La carbonatation est également plus rapide. Cela conduit à une faible résistance aux attaques environnementales et chimiques du béton de granulats recyclés.
Les principaux problèmes de durabilité sont dus à la fraction fine, le sable recyclé. Son emploi doit donc être limité. Une autre voie d'amélioration de la durabilité des bétons recyclés est la réalisation d'une cure soignée.
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Editorial Note Prof. F. Buyle-Bodin is a RILEM Senior Member.
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Buyle-Bodin, F., Hadjieva-Zaharieva, R. Influence of industrially produced recycled aggregates on flow properties of concrete. Mat. Struct. 35, 504–509 (2002). https://doi.org/10.1007/BF02483138
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DOI: https://doi.org/10.1007/BF02483138