Tecnura (Feb 2017)
Evaluation of abrasion of a modified drainage mixture with rubber waste crushed (GCR)
Abstract
General description: Porous asphalt mixtures are defined as an asphalt concrete with air voids content of around 20% and 25%, and the typical binder is a modified asphalt with some elastomeric polymer. Unlike other studies reported on the subject: i) The effect of mixing temperature (160 ° C and 170 ° C) between the asphalt and the GCR (wet modification) was evaluated, ii) Likewise was evaluated the effect of compaction temperature between modified asphalt and granular aggregate (100 ° C, 110 ° C and 130 ° C). Method: This study measured in laboratory, the resistance to abrasion (Cantabria trial) and the stiffness under monotonic (Marshall test) and cyclical (resilient modulus) loading of a porous asphalt mixture MD. Asphalt cement CA 60-70 (PG 64-22) was used as binder. This binder was modified with recycling tyre rubber (GCR) by wet way (The GCR and binder are completely mixed to form asphalt rubber). Results: a significant increase in resistance to abrasion, resistance under monotonic loading and stiffness under cyclic loading of the MD is reported when this mixture is modified with GCR. Conclusion: The results showed that there is a highlighted influence of mix temperature (between asphalt and GCR) and compaction temperature (modified asphalt and aggregate) on the behavior of the MD modified with GCR.
