Abstract
In order to investigate the effect of organic montmorillonite (OMMT) and its content on properties of high-viscosity modified asphalt, a series of laboratory tests were carried out through zero shear viscosity (ZSV) at 60 °C, rutting factor, ductility at 5 °C, and fatigue factor to analyze high-temperature, low-temperature and anti-fatigue properties of high-viscosity modified asphalt with different OMMT contents. The results show that OMMT/high-viscosity modifier (HVM) composite modification can improve obviously high-temperature performance and fatigue resistance of high-viscosity modified asphalt, but the best improvement effect can be achieved only when adding proper amount of OMMT. The addition of a small amount of OMMT has little effect on low-temperature performance of high-viscosity modified asphalt, but when the content of OMMT exceeds 4%, its low-temperature performance will decrease significantly. The addition of OMMT can improve the temperature sensitivity of high-viscosity modified asphalt’s high-temperature performance, but reduces the temperature sensitivity of its fatigue resistance.
Highlights
Asphalt pavement is the main pavement form of highgrade highway in China
The influence of organic montmorillonite (OMMT) and its content on properties of high-viscosity modified asphalt was studied by analyzing high-temperature performance, low-temperature performance and fatigue resistance of high-viscosity modified asphalt with different OMMT contents how to change
The preparation processes are as follows: (1) The 70A matrix asphalt was heated to 160 °C in the oven and was held for 1 h, 13% of high-viscosity modifier (HVM) were added into the matrix asphalt; the mixture was stirred with a glass rod for 5 min and high-speed sheared for 20 min at 2000 rpm with BME100LT
Summary
As a pavement material, asphalt has many disadvantages, for example, it becomes soft and sticky at high temperature, and becomes brittle and cracked at low temperature, and may occur fatigue under repeated loading It has been a hot research field on how to improve the performance of asphalt pavement. Road engineers have found in their exploration that the use of modified asphalt binders is one of the most effective means After adding modifiers such as rubber and resin into ordinary asphalt binders or asphalt mixtures, their high temperature anti-rutting, low temperature anti-cracking and anti-fatigue properties can be improved to some extent. Montmorillonite is a kind of nano-clay with layered silicate structure, which has the characteristics of high strength and large specific surface area After organic treatment, it can form nano-composite structure with other modifiers, which can obviously improve the compatibility between matrix asphalt and modifier, and enhance properties of modified asphalt. The influence of OMMT and its content on properties of high-viscosity modified asphalt was studied by analyzing high-temperature performance, low-temperature performance and fatigue resistance of high-viscosity modified asphalt with different OMMT contents how to change
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