Low temperature properties of UV aged asphalts containing layered double hydroxides modifier

Area of Science:

• Materials Science
• Civil Engineering
• Polymer Chemistry

Background:

• Ultraviolet (UV) radiation accelerates asphalt ageing, negatively impacting performance.
• Research is ongoing to find effective UV blocking materials for asphalt.
• Layered double hydroxides (LDHs) are a novel class of materials with potential UV-blocking properties.

Purpose of the Study:

• To investigate the efficacy of layered double hydroxides (LDHs) as UV blocking additives in different asphalt types.
• To evaluate the impact of LDHs on the low-temperature properties and UV resistance of asphalt binders.
• To assess the performance of LDHs in S70, S90, and styrene-butadiene-styrene (SBS) modified asphalt.

Main Methods:

• Incorporation of LDHs into S70, S90, and SBS modified asphalt binders.
• Testing of low-temperature properties, including equivalent breaking point (EBP) and fatigue factor.
• Analysis of UV ageing effects and degradation rates of asphalt binders with LDHs.

Main Results:

• LDHs demonstrated significant UV blocking capabilities in S70 and S90 asphalts.
• The ageing index of S70 and S90 asphalts was effectively reduced by LDHs.
• LDHs helped to lower the degradation rate of the SBS modifier in modified asphalt.

Conclusions:

• LDHs are a promising additive for enhancing the UV resistance of asphalt.
• The use of LDHs can improve the durability and performance of asphalt pavements exposed to UV radiation.
• Further research into LDHs could lead to more resilient and long-lasting asphalt materials.