Investigating physical and rheological properties of foamed bitumen

Results showed that the same penetration-grade bitumen can provide very different results in terms of foaming properties (expansion ratio and half-life) depending on its chemical composition (differential scanning calorimetry and optical microscope analysis). The experimental program also assessed how the foaming process affected the physical and rheological behavior of bitumens (penetration, Ring and Ball test, dynamic viscosity, complex modulus, and phase angle).