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Interlaminar Shear Characteristics of Typical Polyurethane Mixture Pavement
Guohua Gao1,2, Min Sun3, Chuanchang Xu1,2
1Shandong Key Laboratory of Highway Technology and Safety Assessment, Jinan 250000, China.
Polymers
|September 23, 2022
Summary
Polyurethane (PU) road binders offer good performance but have poor interlayer bonding. This study analyzes PU composite pavement shear characteristics, finding treatments meet requirements despite some damage from environmental factors.
Area of Science:
- Civil Engineering
- Materials Science
- Pavement Engineering
Background:
- Polyurethane (PU) exhibits favorable mechanical properties, durability, and temperature stability for road construction.
- A significant challenge with PU mixtures is their poor interlayer bonding with traditional asphalt mixtures.
- Understanding interlayer shear behavior is crucial for PU composite pavement performance.
Purpose of the Study:
- To analyze the influence of pavement structure, interlayer treatment, load, and environmental factors on the interlayer shear characteristics of PU mixture composite pavements.
- To evaluate the performance of different pavement structures under various conditions.
- To determine if current interlaminar treatment schemes meet shear resistance requirements.
Main Methods:
- Conducted dynamic modulus, Hamburg rutting, accelerated loading, and inclined shear tests.
- Calculated typical PU mixture pavement shear stress.
- Determined interlaminar shear stress for double-layer PU, PU-asphalt composite, and typical asphalt pavements.
- Analyzed the impact of temperature and load on shear stress.
Main Results:
- PU mixtures demonstrate low rutting, stable properties, and resistance to combined temperature, water, and load effects.
- Double-layer PU structures show good water-temperature stability and fatigue resistance but are susceptible to freeze-thaw and accelerated loading damage (residual shear strength ratio of 50.3% and 35.6%).
- Interlaminar shear stress in PU-asphalt composite pavement increases with temperature (approx. 20% from 10°C to 50°C), while PU and asphalt pavements are primarily load-dependent.
- Calculated maximum shear stresses were below measured interlaminar shear strengths for all tested structures.
Conclusions:
- Interlaminar treatment schemes for PU composite pavements are adequate for shear resistance under tested conditions.
- While PU mixtures offer advantages, their susceptibility to environmental degradation like freeze-thaw requires consideration.
- Further research may be needed to enhance the durability of PU composite pavements against severe environmental factors.
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