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(Automatic translation)

In-situ validation of the SCORE Project

Didier Lesueur
Technical director. Probisa (Spain)

José Miguel Baena
Government Department of Works and Public Spaces. Ayto. De Madrid
Head of the Technology and Roadway Studies of CEDEX quadrant the project (Spain)

José Luis Peña
FENIX Project Technical Coordinator
Responsible Probisa Technical Assistance during the project (Spain)

Jiri Fiedler
Technical Assistant STAVBY SILNIC A Zeleznic (Czech Republic)

Since the beginning of the project, the partners had decided to validate SCORE experimental works, different ideas and methods researched during the project. It could study as follows:

• the effect of milling conditions and compaction on density,

• the effect of binder type (foam, conventional emulsion or nanoemulsion) on the recycling, and

• the effect of cement content on the mechanical properties of the materials.

This article presents the works in this context (4 sections in the Czech Republic and 2 in Spain) and the main conclusions which can obtain. The experimental work was logically carried out at the end of the project, in late spring and early summer of 2005, and therefore observations are based on two years of service.

The elements accumulated in several works show the beneficial role of cold recycling for improving the structural properties of a firm with high deflections, from deflections 63 1 / 100 8 mm to values ​​1 / 100 mm in the A-494.

This structural improvement is also accompanied by an improvement in longitudinal evenness with an IRI passes a value 3,0 1,7 after recycling.

These trials also possible to confirm the effect of milling conditions on the grading of milling, comparing with previous results in controlled sections already published.

NAT modules 20ºC on specimens taken from in-situ recycling with emulsion after one month on
A-494 gave values ​​± 3.100 1.000 MPa (where the variation range represents the extreme values ​​found). This order of magnitude fits with the results obtained in other works and especially with the results of the formulation studies, which gave 3.000 1.000 ± MPa to 15ºC and 10 Hz after the curing period

Finally, if you begin to get accurate modulus values ​​for cold recycling, then use
in pavement design, it remains to clarify the mechanisms of deterioration of these materials, and more
precisely the validity and interpretation of the fatigue tests, very difficult to make this kind of little cohesive material. The long-term monitoring of these experimental sections could provide an answer.

Recycling, Cold recycling, Experimental Tranche, Tranche test, Emulsion, Foam bitumen, nanoemulsion, SCORE.

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