About the author:

1. China Design Group Co., Ltd., Nanjing, Jiangsu 210014, China; 2. College of Highway, Chang’an University,Xi’an, Shaanxi 710064, China; 3. Engineering Design and Research Institute of China CommunicationsSecond Highway Engineering Bureau Co., Ltd., Xi’an, Shaanxi 710065, China

Abstract:

Lignin is the earliest fibre used in asphalt mastic, but it is prone to deformation and failure athigh temperature and has poor long⁃term performance. Based on this, a comparative study of lignin fibreand basalt fibre at different temperatures, different dosage of asphalt mastic, through the cone penetrationexperiment, DSR experiments, bending beam rheological test to characterize the rheological properties ofasphalt mastic, the results show that the two types of fibers can be distributed in asphalt mastic to form athree⁃dimensional network structure, After the addition of the fibres, the consistency of the asphalt masticis increased due to the embedding effect of the fibres, and the shear strength is also increasedaccordingly. The complex modulus of basalt fibres is higher than that of lignin fibres, the phase angle isreduced, the strain hysteresis is reduced, the elasticity component is increased, the storage energy isgreater, the loss energy is reduced, the permanent deformation is reduced and the rutting factor is higher,which shows better rheological performance. And the basalt fibre has a higher rate of change of strength,which shows a better blocking effect and force transmission, and a better low⁃temperature crackingresistance, but the low⁃temperature cracking resistance of the two types of fibres tends to be reduced afterthe fibre doping exceeds 3.9%. And the lignin fibre is more sensitive to temperature than the basaltfibre,with different trends at different temperatures. In summary, the basalt fibre showed better rheological properties for asphalt mortar.