Study on the Temperature and Load Dependence of Rutting Resistance for Large Stone Asphalt Mixture LSAM-50

Area of Science:

• Materials Science
• Civil Engineering
• Pavement Engineering

Background:

• Rutting resistance is critical for asphalt pavement durability.
• Large Stone Asphalt Mixture (LSAM-50) performance under varying conditions requires detailed investigation.

Purpose of the Study:

• To evaluate the rutting performance of LSAM-50 under different temperatures and loads.
• To establish a permanent deformation model and explore correlations with key performance indicators.

Main Methods:

• Large-thickness rutting tests were conducted on LSAM-50.
• Analysis of rutting deformation characteristics under varied thermal and loading conditions.
• Development of a permanent deformation-temperature-load dependency model.

Main Results:

• Temperature-load interaction activates the interlocking effect of LSAM-50's skeleton.
• Dynamic stability decreases significantly with increasing temperature or load (40-57% degradation rate between 40-50 °C).
• Rutting deformation is temperature and load-dependent, stabilizing after initial rapid increase.
• A 'training' effect was observed under initial low temperatures and light loads.
• The permanent deformation model achieved a 96% predictive correlation.
• Permanent deformation strongly correlates with 1-h rutting depth (R²=0.95), compressive strength (R²=0.91), and shear strength (R²=0.97).

Conclusions:

• LSAM-50's rutting resistance is significantly influenced by temperature and load.
• The 'training' effect enhances rutting resistance, leading to negligible deformation post-densification.
• Established high-temperature evaluation indicators can accurately estimate permanent pavement deformation.