Análise do uso da seiva da Euphorbia Tirucalli na composição de uma emulsão asfáltica para tratamentos superficiais por penetração

Abstract

The application of materials from renewable sources in the paving area, mainly the asphalt binder, makes it necessary to develop innovative technologies that allow their total or partial replacement in the construction of more sustainable roads. This work aims to analyze the potential of an asphalt bioemulsion (ETPav) for use in surface treatments by penetration (TSP), partially replacing the binder by petroleum plant sap (Euphorbia Tirucalli). For this, an experimental program was developed, consisting of two phases. In the first phase, there was the sap extraction and manufacture of the biobinder and bioemulsion, in addition to the characterization of the binders and aggregates used, with the second phase consisting of the evaluation of the performance of the bioemulsion through the loss of aggregates and adhesiveness tests. The results of the first phase indicated that the addition of sap and the process of emulsification of the ligand reduced its complex modulus, in addition to increasing its phase angle. As for the Multiple Stress Creep Recovery (MSCR), the addition of sap led the biomaterial to have a worse performance when compared to the conventional emulsion, increasing the non-recoverable compliance of the biobinder. According to the rheological analysis of the characterization of the emulsions and analyzing the data according to the Emulsion Performance Grade (EPG), it is possible to verify the suitability of the bioemulsion for paving services in TSP in the indicated temperature ranges. The emulsion performance tests consisted of aggregate loss tests, using the Wet Track Abrasion Test (WTAT) and aggregate-binder adhesiveness using the Binder Bond Strength (BBS). The WTAT with ETPav showed a limitation in the setting mechanism of the bioemulsion, making it necessary to increase the curing time. Due to the differentiated curing mechanism, the BBS was carried out with the emulsion residue, in order to verify the compatibility with the aggregate. The bioemulsion obtained a similar result to the conventional emulsion in this regard. Therefore, ETPav shows promise, provided that further studies are carried out on its rupture mechanism, with the possibility of using additives, for a release time for traffic compatible with the conventional emulsion.