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RESISTANCE TO MOISTURE DAMAGE OF BITUMINOUS MIXTURES WITH RECYCLED CONCRETE AGGREGATES



Author(s): Neves, J. , Freire, A. C.
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: 274-281
Total Pages: 08
Language : English


Abstract: The objective of this paper is to analyse the resistance to moisture damage of bituminous
mixtures containing recycled concrete aggregates. Resistance to moisture damage is an
important durability concern and was evaluated on the basis of two properties: affinity
between aggregate and bitumen and water sensitivity. An experimental study developed in
laboratory was performed on the two types of AC 20 base bituminous mixtures as follows:
hot mix asphalt (HMA), with a 50/70 paving grade bitumen, and warm mix asphalt (WMA),
with a 35/50 paving grade bitumen, which was modified by the producer at the origin. The
aggregate mixture, based on virgin aggregates from crushed limestone rocks, also included
recycled crushed concrete aggregates from construction and demolition waste (25 % and 60
%, respectively). Water sensitivity tests (EN 12697-12) were based on the indirect tensile
strength of specimens in accordance with EN 12697-23. The affinity between aggregate and
bitumen tests (EN 12697-11) used the rolling bottle method to evaluate the effect of moisture
on the recycled aggregate-bitumen. The test results showed an adequate behaviour in terms of
affinity but were less satisfactory in the case of water sensitivity. This type of recycling is
promising but should be further studied.


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


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