Abstract
Limited studies in recent years have shown that asphalt pavement subject to seawater in coastal regions or deicing salt in cold regions may be seriously damaged after being soaked in saline water for a long time. However, there is limited research into the influence of salt on rheological properties of asphalt after long-term aging. In this study, rheological properties of unmodified and polymer-modified asphalt after long-term aging were tested after being soaked in different concentrations of salt (0.3%~5%) for different durations (1 day~30 days). Orthogonal array based on the Taguchi method was used for experimental design. The frequency sweep tests were performed on the specimens of aged asphalt after being soaked for complex modulus and phase angle master curves and ultimate fatigue temperature. BBR tests were performed for stiffness. The test results indicate that saline water appears to reduce low temperature properties and fatigue resistance properties and improved high temperature properties of aged asphalt, and it also affects the sensitivity of complex modulus and phase angles at low frequencies.
Highlights
Seawater can invade asphalt pavement structure under the effect of tide and hurricane and salt will be left on the surface of pavement after evaporation. 77.75% of seawater salt is sodium chloride [1]
Deicing salt with snow invaded into asphalt concrete will accelerate freeze-thaw damage and cause destruction of asphalt pavement [7, 8]
The main purpose of the test was to verify that nanomodified asphalt plays a positive role in eliminating cryoprotectants to damage asphalt mixtures, the results revealed that chemical composition of chlorine salt can greatly affect the strength of asphalt mixtures
Summary
Seawater can invade asphalt pavement structure under the effect of tide and hurricane and salt will be left on the surface of pavement after evaporation. 77.75% of seawater salt is sodium chloride [1]. Hassan et al [10] studied the effects of various antifreeze agents (including various chloride salts antifreeze agent) and found that they have negative impacts on the aggregate and the asphalt mixture in the case of freezing and thawing. They found that freezing and thawing asphalt mixtures in different antifreeze solution causes more damage than freezing and thawing them in pure water. It can be seen that existing research on this topic mostly focused on the impact of salt on the performance of asphalt mixtures, and only one was conducted on asphalt binder using three basic indicators. Non-modified asphalt and SBS modified asphalt after long-term aging were soaked in different concentrations of salt at various durations and were subsequently tested for rheological properties
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