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INFLUENCE OF THE NATURE OF FRACTION UNBOUND NATURAL AGGREGATES ON THE SENSIBILITY TO SULFATE ATTACK OF RECYCLED AGGREGATES STABILIZED WITH CEMENT



Author(s):
Paper category: Proceedings
Book title: IV International Conference Progress of Recycling in the Built Environment
Editor(s): Isabel M. Martins, Carina Ulsen, Yury Villagran
ISBN:
e-ISBN: Isabel M. Martins, Carina Ulsen, Yury Villagran
Publisher: RILEM Publications SARL
Publication year: 2018
Pages: 299-306
Total Pages: 08
Language : English


Abstract: In the study of the application of recycled aggregates produced in Spain for its stabilization
with cement and use in road pavement bases, it was observed that the mechanical and durability
behaviour of the Mixed Recycled Concrete Aggregate (MRCA) is worst compared to the Mixed
Recycled Masonry Aggregate (MRMA).
In the production of the MRCA, the aggregate producers tried to improve its quality adding
stones of diverse types coming from the construction and demolition waste.
The effect of the sulfate attack on recycled aggregates is specifically studied. This study has
revealed the responsibility of certain metamorphic rocks, such as shales, in the bad behaviour
of the MRCA in sulfate environments.
The behaviour gets even worse when the recycled aggregate of concrete is contaminated by
construction gypsum.
The conclusion is that the characterization of the nature of the fraction unbound natural
aggregates (Ru) must be included in the quality assessment of recycled aggregates in relation
of his influence in durability of the application.


Online publication : 2018
Publication type : full_text
Public price (Euros) : 0.00


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