Open AccessDynamic Viscosity Standard of High Viscosity Modified Asphalt Considering Temperature and Load Coupling Effect
Author(s) -
Jun Li,
Yingtao Li,
Mingliang Li,
Huanzhang Lü,
Dongwei Cao
Publication year - 2021
Publication title -
iop conference series. materials science and engineering
Language(s) - English
Resource type - Journals
eISSN - 1757-899X
pISSN - 1757-8981
DOI - 10.1088/1757-899x/1075/1/012013
Subject(s) - asphalt , viscosity , rut , coupling (piping) , temperature dependence of liquid viscosity , materials science , viscosity index , stability (learning theory) , logarithm , relative viscosity , thermodynamics , composite material , mathematics , computer science , physics , base oil , mathematical analysis , scanning electron microscope , machine learning
The anti-ravelling and anti-rutting performances of porous asphalt pavement are significantly affected by dynamic viscosity of high viscosity modified asphalt. Climatic and traffic conditions vary greatly due to the vast territory of China, and dynamic viscosity standard has not been recommended up to now aiming at different temperature and load conditions. The influence of high viscosity additive dosage on key property indexes was firstly analysed for asphalt and asphalt mixture, and appropriate dosage was recommended. The dynamic stability changing law of porous asphalt mixture was revealed under different temperature, load and their coupling conditions. Multiple regression relation of them was established. Finally dynamic viscosity standard was proposed considering temperature/load coupling effect. The research results show that when high viscosity additive dosage exceeds 10% for 70# base asphalt, the increasing trend of dynamic viscosity becomes slowing down. Semi-logarithmic relations of dynamic stability with ravelling loss, Marshall stability were respectively found, and double-logarithmic relation of that with dynamic viscosity was found. The appropriate dosage of high viscosity additive is recommended as 12%. Based on multiple regression formula of dynamic stability with dynamic viscosity, temperature and load, the lower limit of 60°C dynamic viscosity is recommended as 50000Pa•s for normal region, 1Pa•s for heavy-load region, 2Pa•s for high-temperature region, and 4Pa•s for heavy-load & high-temperature region.