Asphalt concrete is the prevailing material used for road surface construction. Its adequate characteristics in providing stability, durability and driving safety are controlled by complex interactions between its components. Thus, it is important to estimate the sensitivity of asphalt concrete mechanical properties as a function of its volumetrics. For this study, different combinations between asphalt content (3.5, 5 and 7.5%) and porosity values (above 4%) were used in order to disassociate these properties. The influence of mixing in fiberglass (0.5%) was also analyzed. It was found that porosity is significantly more relevant than the asphalt content in the prediction of tensile strength and resilient modulus of fiber-free asphalt concretes. In fiber-reinforced mixtures, the mechanical properties are improved by increasing the asphalt content, which suggests a better bonding between fibers and aggregates. For both cases, decreasing porosity is beneficial. By grouping both sets of results, it was possible to create a unique theoretical curve for both the tensile strength (q_t) and the resilient modulus (RM). The RM/q_t ratio was 5800 for the fiber-free group, and 3900 for the fiber-reinforced group - suggesting a better fatigue life indicator for asphalt concretes when fibers are added.

沥青混凝土是用于路面施工的主要材料。它在提供稳定性，耐用性和行驶安全性方面的适当特性受其组件之间复杂的相互作用控制。因此，重要的是根据其体积来估计沥青混凝土机械性能的敏感性。对于本研究，使用了沥青含量（3.5％，5％和7.5％）和孔隙率值（高于4％）之间的不同组合，以消除这些特性。还分析了混合在玻璃纤维（0.5％）中的影响。结果发现，在预测无纤维沥青混凝土的抗张强度和弹性模量时，孔隙率比沥青含量更为重要。在纤维增强的混合物中，通过增加沥青含量可以改善机械性能，这表明纤维与聚集体之间的粘合性更好。对于这两种情况，降低孔隙率都是有益的。通过对两组结果进行分组，可以为两条抗拉强度（q_t）和弹性模量（RM）。无纤维组的RM / q _t比为5800，纤维增强组的RM / q _t比为3900，这表明添加纤维后沥青混凝土的疲劳寿命指标更好。