Related Experiment Video
Updated: Dec 25, 2025
08:03
Advanced Self-Healing Asphalt Reinforced by Graphene Structures: An Atomistic Insight
Published on: May 31, 2022
5.5K
Interface Behavior of Asphalt Pavements Constructed by Conventional and Double-Decked Paving Methods
Ke Mu1, Zhiwei Gao2, Xin Shi3
1State Key Laboratory of Road Engineering Safety and Health in Cold and High-Altitude Regions, CCCC First Highway Consultants Co., LTD, Xi'an 710065, China.
Materials (Basel, Switzerland)
|March 21, 2020
Summary
The double-decked paving method enhances asphalt pavement
Area of Science:
- Civil Engineering
- Materials Science
- Pavement Engineering
Background:
- Asphalt pavement construction involves layering asphalt with decreasing aggregate size.
- Ensuring reliable interface strength between asphalt layers is crucial for pavement serviceability.
- Two primary construction methods exist: conventional (layer-by-layer) and double-decked.
Purpose of the Study:
- To compare the interface behavior of asphalt pavements constructed using conventional versus double-decked methods.
- To evaluate the impact of paving method on interface shear and tensile strength.
- To validate laboratory findings with in-situ trial pavement tests.
Main Methods:
- Laboratory testing of asphalt specimens prepared using both paving methods.
- Interface shear strength and uniaxial tensile strength tests.
- In-situ trial pavement construction followed by coring and interface strength testing.
Main Results:
- Double-decked method relies on aggregate interlocking for interface strength; conventional method relies on tack coat.
- Interface shear and tensile strength were 1.5-1.8 times higher in the double-decked method specimens.
- Trial pavement tests confirmed higher interface strength for the double-decked construction method.
Conclusions:
- The double-decked paving method significantly enhances asphalt pavement interface strength compared to the conventional method.
- Aggregate interlocking is a key factor in the superior performance of the double-decked method.
- The findings support the practical application of the double-decked method for improved pavement durability.
Related Concept Videos
01:21Masonry Paving
406
The construction of masonry paving involves using materials such as bricks, stones, and concrete masonry units. These materials are chosen for their shape, color, strength, and resistance to abrasion and weathering. Masonry units can be installed dry on a thin layer of sand and a gravel base, or they can be embedded in mortar or asphalt on a concrete slab. For areas subjected to heavy vehicular loads, a rigid base layer of reinforced or unreinforced concrete is recommended. In contrast,...
406
01:28Design Example: Joints in Concrete Pavements
417
Concrete pavement joints are essential for maintaining the structural integrity and longevity of pavement by controlling where and how the pavement cracks. These joints can be categorized based on their functions, such as contraction or control joints, construction joints, isolation joints, and expansion joints.
Contraction joints are typically formed by sawing a groove into the concrete shortly after it has hardened. This creates a weakened vertical plane, deliberately encouraging cracking at...
Contraction joints are typically formed by sawing a groove into the concrete shortly after it has hardened. This creates a weakened vertical plane, deliberately encouraging cracking at...
417
01:23Abrasion Resistance of Concrete
433
Abrasion resistance is an essential characteristic of concrete that determines its durability and longevity under various wear conditions. Concrete surfaces are vulnerable to different types of abrasion. For instance, surfaces may wear down due to the constant movement of vehicles or be eroded by solids carried in water, as seen in concrete canal linings. Specific tests are conducted to measure the abrasion resistance of concrete.
One such test is the revolving disc test, where three plates...
One such test is the revolving disc test, where three plates...
433
01:29Preplaced Aggregate Concrete
288
Preplaced aggregate concrete is ideal for construction environments that are not easily accessible. The process begins by properly wetting the gap-graded coarse aggregates to remove the dirt, then placing it in the form and compacting it. Voids are filled with a mortar mix pumped under pressure through slotted pipes. This mortar typically consists of Portland cement, pozzolan, fine aggregates, water, and a fluidizing aid. The pozzolan helps reduce bleeding and segregation while improving the...
288
01:22Toughness and Hardness of Aggregate
530
Toughness and hardness are critical properties of aggregate materials used in concrete, particularly on pavement surfaces and industrial flooring subjected to heavy loads. Toughness is defined as the aggregate's resistance to failure by impact and is measured by the aggregate impact value (AIV). For this, the aggregate impact value test is performed, wherein the impact is delivered by a standard hammer, which falls freely under its own weight onto the aggregates. The aggregates fragment in...
530
01:24Design Example: Aggregate Gradation
262
The right type and quality of aggregates are crucial for concrete as they significantly influence its properties, mix proportions, and cost-effectiveness. If different sources are available for sand, the commonly used fine aggregate in concrete, the selection of sand is primarily based on its gradation.
The grading, or particle-size distribution, of sand is determined using sieve analysis, with standard sizes ranging from 150 μm to 10 mm (ASTM No. 100 sieve to 3⁄8 in. sieve). Sand is...
The grading, or particle-size distribution, of sand is determined using sieve analysis, with standard sizes ranging from 150 μm to 10 mm (ASTM No. 100 sieve to 3⁄8 in. sieve). Sand is...
262