Community Research and Development Information Service - CORDIS

New method for cold recycled mixtures design, based on its cohesion and its cracking energy and deformation

The method employed for the cold mixtures design nowadays is based on tests and proceedings developed for the study of hot bituminous mixes. They are designed considering, basically, its stability, but in the case of cold recycling, the basic property to consider is the cohesion given by the emulsion to the reclaimed material.

In that sense, a new methodology for the design and characterisation of these materials has been developed. It is based on the cohesion of the cold recycled materials evaluated by means of the indirect tensile test. The cohesion of the mixture is measured under dry and wet conditions, in order to evaluate, also, its resistance to the stripping, another very important parameter to characterise and to design these materials.

Another parameter which is going to be considered to improve the proposed method is the tenacity (toughness) of the mixture, evaluated by means of the application of BTD test (Direct Tensile Barcelona). This test evaluates the resistance of the mixture to cracking fatigue failure in pavements.

It has also been defined a new proceeding to manufacture the specimens in the laboratory which obtains specimens densities closer to the mixtures obtained at the field.

Reported by

Universitat Politecnica de Catalunya - UPC
C/ Jordi Girona 1-3, Edificio B1
08034 Barcelona
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