The document discusses producing and testing half-warm mix recycled asphalt (HWMRA) with different percentages of reclaimed asphalt pavement (RAP). The objectives are to 1) develop a procedure for designing HWMRA mixes with varying RAP, 2) characterize the mixes mechanically to validate performance for urban streets, and 3) validate the technology through constructing test sections. The manufacturing process and equipment are described. Infrared thermography was used to detect segregation during construction. Long-term performance was assessed in a test track. Fatigue laws were established for HWMRA and conventional mixes. The conclusions were that HWMRA with 100% RAP was successfully produced, laid, and compacted for urban

1. www.superitn.eu
Half Warm Mix Recycling Asphalt in urban roads
(ESR6)
José Manuel Lizárraga López
SACYR CONSTRUCCIÓN
March 2nd-2015

2. Objectives
Producing HWMRA 100% and 70% RAP
1. Development of an specific procedure to design HWMRA with
different percentage of RAP
2. Mechanical characterization of these mixes to validate the
mechanical performance on wearing courses in urban streets.
3. Validation of the technology asphalt under real conditions
through the construction of urban test sections.

3. Technology of manufacturing of half-warm recycled
asphalt mixture at total rate (100% RAP)
The correct handling of the
stockpiles is critical to avoid
segregation and contamination
This material was classified and
sieved to remove any oversized
particles and fractionated to the
required nominal maximum
aggregate size.

4. Manufacturing Process
The parallel flow dryer drum
consists of two side inlet rings
which together make up the
heating process of RAP.
The discharge hopper has a
theoretical storage capacity of 4
m3.

5. Overview of Asphalt Continuous
Mixing Plant

6. Use of Infrared Termography to detect
segregations during the Construction of HWMRA

7. Studying the long-term performance
assessment of the HWMRA in CEDEX test track

8. Fatigue Laws of HWMRA & HMA
2.5
3.0
3.5
4.0
4.5
5.0
5.5
6.0
6.5
1.80 1.90 2.00 2.10 2.20 2.30 2.40 2.50 2.60
LogN⁰Ciclos
NapLog: (Deformación)
3%Emulsión
2,5%Emulsión
Convencional

9. Conclusions
• We have achieved to produce, spread and
compacting the half warm mix recycled asphalt
with total recovery rate (100%RAP) for wearing
courses in urban asphalt roads according to
General Technical Specifications for road and
bridges in Spain (PG-3).

10. Acknowledgements
The research presented in this presentation was carried out as
part of the Marie Curie Initial Training Network (ITN) action,
FP7-PEOPLE-2013-ITN.
This project has received funding from the European Union’s
Seventh Framework Programme for research, technological
development and demonstration under grant agreement
number 607524.