Improvement of Bearing Capacity in Recycled Aggregates Suitable for Use as Unbound Road Sub-Base

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Author
Garach, Laura
López, Mónica
Ordóñez, Javier
Alegre, Javier
Moya, José Antonio
Agrela Sáinz, Francisco
Publisher
MDPIDate
2015Subject
Self-cementingMechanical properties
Recycled aggregates
Pozzolanic reactions
Electronic microscopy
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Show full item recordAbstract
Recycled concrete aggregates and mixed recycled aggregates are specified as types of
aggregates with lower densities, higher water absorption capacities, and lower mechanical strength
than natural aggregates. In this paper, the mechanical behaviour and microstructural properties
of natural aggregates, recycled concrete aggregates and mixed recycled aggregates were compared.
Different specimens of unbound recycled mixtures demonstrated increased resistance properties.
The formation of new cement hydrated particles was observed, and pozzolanic reactions were
discovered by electronon microscopy in these novel materials. The properties of recycled concrete
aggregates and mixed recycled aggregates suggest that these recycled materials can be used in
unbound road layers to improve their mechanical behaviour in the long term