Adhesiveness Evaluation of Biomaterials from Wood for Asphalt Binder Modification

The transportation of cargo is essential for the development of any country. The good condition of roads is therefore essential for the efficient flow of production. They are usually paved with asphalt, which comes from the distillation of petroleum, which is a finite material. Therefore, it is important to enhance research efforts aimed at exploring biomaterials capable of substituting a portion of the asphalt binder. Thus, the objective of this study is to evaluate the impact of wood-derived biomaterials, such as lignin and tannin, interfere with the adhesion of asphalt binders to aggregate and whether there is an influence on solubility. For this purpose, they were mixed with 50/70 asphalt binder at concentrations of 3%, 6% and 9% in relation to the mass of the binder. The solubility evaluation reveals that lignin is less soluble in water than tannin. The adhesiveness tests concluded that the mixtures of 50/70 binder with tannin or lignin and basalt aggregate obtained satisfactory results for all the samples. The mixtures made with granite all looked unsatisfactory for both biomaterials. However, the degree of unsatisfaction differed between the samples. Accordingly, water solubility does not affect the adhesion of the binder to the aggregate. Furthermore, in the case of granite aggregate, there was an improvement in adhesiveness in samples with higher levels of tannins. This was not evident in the samples with lignin, since the improvement in adhesion occurred at lower levels.