Abstract: The papers presents the assessment of correlation between the viscoelastic properties of low-viscosity bitumen and thermal susceptibility of the resilient modulus of elasticity. Tests were carried out on the asphalt concrete AC 11 S in accordance with PN-EN 13108-1. The experiment was conducted on samples of bitumen which penetration was 35/50. Six variants of the modification were prepared by application the low-viscosity modifier (obtained in process of Fisher-Tropsh synthesis) in the range of 1.5 % to 4 % with steps 0.5 %. The asphalt concrete was compacted at temperature range between 110°C and 145°C. The framework of mineral mix in all samples was identical. The following properties of bitumen binders were considered: complex modulus G*, phase angle δ in frequency range of 0,01 to 10 Hz. Moreover, bitumen tests were supplemented by assessment of additional properties such as: dynamic viscosity versus shear rate in temperature range of 110°C and 145°C, penetration grade, softening point and breaking point temperature. The following properties of asphalt concrete were tested: void fraction content, resilient modulus of elasticity at temperature range of -5°C to 25°C. In results of research process was found that viscoelastic properties of low-viscosity bitumen considerable affected changing the resilient modulus of elasticity in relation to the reference asphalt concrete. The evaluation of test results revealed that thermal susceptibility of resilient modulus of elasticity was mainly depend on concentration of synthetic wax content in virgin bitumen which in significant way stiffen the asphalt concrete.
