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Residual soils result from chemical weathering, so their characteristics depend on environmental factors, in addition to origin, topography, drainage and geological age. In the unsaturated condition, the behavior of soils is conditioned by suction, which refers to the state of the soil under reduced pressure. The aim of this study is to compare the water retention curve fitting equations in the study of tropical unsaturated soils through the filter paper technique and the analytical analysis of the data obtained in this test. By performing the analysis of the statistical evaluation parameters used in this study and the proximity of its values to the necessary boundary conditions defined for the equation to explain the soil suctioning behavior of the soil as it loses moisture naturally to the environment, it was verified that the Van Genuchten equation appeared to be the most suitable.

Warm Mix Asphalt (WMA) refers to a variety of asphalt mixtures produced at lower temperatures than those conventionally used to produce hot mixture asphalt. These reductions in the production temperatures provide social, economic, and environmental gains. This study aimed to investigate the mechanical properties of asphalt mixtures composed of asphalt binders modified with sunflower oil at the addition contents of 1%, 2%, and 3%. Indirect tensile strength, resilient modulus, water sensitivity, dynamic modulus, rutting resistance, and fatigue life of the asphalt mixtures were evaluated. Results showed that the mechanical performance of asphalt mixtures composed of oil-modified asphalt binder decreased compared to that of the mixture with neat asphalt binder, even though all of them are suitable for application in surface courses according to the current technical requirements for asphalt concretes. However, asphalt mixtures with sunflower oil-modified binders presented enhances in adhesion, which indicates less susceptibility to moisture than their equivalent non-modified.