Research Information System
IRF World Congress 2024, İstanbul, Turkey, 15 - 18 October 2024, pp.1-16
ICA IC İÇTAŞ Construction Infrastructure Operation And Maintenance Incorporated Company
conducts research on the use of recycled asphalt pavements (RAP) as recycled
mixtures in certain proportions in new mixtures and the questioning of their
performance values. ICA aims to take this study within the scope of R&D to
the implementation stage. It is aimed to develop a high-ratio recycling
process. Extraction tests were performed and bitumen was recovered from RAP
material. Conventional and advanced characterization tests were performed for
RAP bitumen. The tests were repeated by adding the selected rejuvenator to RAP
bitumen. 50/70 penetration bitumen tests, aged 50/70 penetration bitumen tests
and 50/70 penetration bitumen tests containing rejuvenator were performed. RAP
material gradation and bitumen percentage determinations were made. Reference
design and mixture designs containing 50% RAP were completed. Mixtures
containing 0% and 50% RAP were examined with water sensitivity tests, rutting
tests and fatigue tests. In particular, fatigue tests were examined with
four-point bending fatigue tests, aiming to bring a comprehensive approach to
the subject in terms of fatigue and to question the rejuvenating performance.
In Type 1 Design, performance analyses of mixtures with 50% recycled asphalt
pavement added without changing the mixing ratios are carried out. Mixtures
containing 50% RAP asphalt mixtures with the selected rejuvenating additive are
questioned with Modified Lottman water damage test, Hamburg rutting test and
four-point bending fatigue tests. In the determined optimal contents, mixtures
with 0%-50% RAP content are examined in terms of performance tests together
with the suggested additive improvement mechanisms.