Materiales de Construcción, Vol 66, No 324 (2016)

Concrete manufactured with crushed asphalt as partial replacement of natural aggregates


https://doi.org/10.3989/mc.2016.06515

L. Coppola
University of Bergamo, Italy

P. Kara
Riga Technical University, Latvia

S. Lorenzi
University of Bergamo, Italy

Abstract


The paper focuses on the reuse of crushed asphalt (GA) as a partial replacement (up to 20%) of natural aggregates for concrete manufacture. Addition of GA aggregates produced a positive effect on workability loss. The GA mixes, however, showed a significant tendency to bleed and segregate at the highest replacement percentage applied. GA led to a decrease of compressive strength in concrete (with respect to that of the reference concrete) up to 50% due to the weakness of the cement paste / recycled aggregate interface. To compensate for this negative effect, a reduction of w/c for the GA concretes was necessary. A decrease of w/c allowed the GA concretes to show drying shrinkage values substantially similar to those of reference concrete with the same cement factor. The experimental results confirmed the possibility of partial substitution (max. 15%) of natural aggregates with crushed asphalt for making concrete.

Keywords


Concrete; Waste treatment; Aggregate; Workability; Compressive strength

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References


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