Thermoreversible aging is an important factor that affects the durability of asphalt pavement in cold and high altitude areas. Although there has been increasing attention to significance thermoreversible recent years, contribution components remains unclear existing literature. To this end, potential may affect binders were regarded as additives study. The extended bending beam rheological test (ExBBR), thermal stress calculation, modulated differential scanning calorimetry (MDSC) analysis...

During the past thirty years, interface bonding between pavement layers has been a topical subject worldwide to research. In this context, many researchers have developed and utilized their own devices investigate properties of interfaces. absence an international standard procedure for bonding, it is inevitable that testing results are not comparable in all cases. addition, various conducted studies reveal parameters such as temperature, loading conditions, materials so on exert influence...

Racking in asphalt pavements has always been the leading cause of pavement damage. This study aims at investigating effects mesostructure characteristics mixture on fracture behavior semicircular bending (SCB) samples. To fulfill this objective, a two-dimensional (2D) finite-element model (FEM) an considering viscoelastic properties was established by using digital image processing (DIP) technology and cohesive zone (CZM). The FEM method validated based experimental results. On basis, whole...

The novel cement grout asphalt composite (CGAC) in this study is a new semiflexible consisting of open-graded hot mix (HMA) filled by injecting materials. mechanical performance and engineering properties the were evaluated through laboratory tests, including Marshall stability test, rutting three-point bending split tensile permeability test. Moreover, field test sections constructed, results situ compared. showed that, after grouting, materials was further enhanced, especially their...

The objectives of this paper are twofold: (1) Investigate the low-temperature reversible aging discrepancy mechanism asphalt binders with similar regular performance grade; and (2) evaluate effects commercial wax on properties binder. First, mechanisms in binder were reviewed. Then, grading tests extended bending beam rheometer used to comprehensively effect base type content properties. Moreover, a modulated differential scanning calorimetry test was applied analyze phase transition,...

Existing wax-based warm mix additives have poor compatibility with asphalt binders, which results in premature wax precipitation and cracking of the pavement. However, there are few studies on improving between waxes asphalt. In this study, temperature (WPT) was recommended as a new suitable evaluation index according to consistency changing laws solubility parameter distance deduced from Hansen (HSP) experiments WPT, component better also introduced by maleation natural waxes. On basis,...

In order to investigate the actual strain response of asphalt pavement under real condition, three types sections with typical surface structures are built. The effects axle configuration, load, speed and testing temperature on were analysed through in situ dynamic loading. Experimental results indicate that at bottom layer increases increasing load temperature, but decreases rise speed. On other hand, exerts different influence levels structures. It is also concluded tandem could lead a...

The interface bonding condition between asphalt concrete layers is unquestioned as one of the significant factors influencing pavement performance. In order to research characteristics under traffic loading, this paper presents a procedure estimate shear strength via direct test where both normal and stresses are applied interface. To do this, first, laboratory testing was conducted varying conditions temperature, vertical pressure, tack coat application rate analyze influence each parameter...

This paper aims to reasonably evaluate the reversible aging resistance of asphalt binders and comprehend effects low-temperature gradually hardening on fundamental properties binders. To do so, extended bending beam rheometer (ExBBR) test with prolonged different conditioning times were performed kinds binders, viscoelastic mechanics model (Burgers model) was employed for describing rheological properties. The combined Avrami-Ozawa equation applied characterise non-isothermal crystallization...

This paper aims to investigate the influence of thermal history on intermediate and low-temperature characterisation asphalt binders. First, various binder methods significance were reviewed. Second, regular Superpave performance grading (PG) test, extended bending beam rheometer (Ex-BBR) double edge-notched tension (DENT) test torsion bar frequency sweep performed selected samples with different treated history. In addition, black space diagrams also drawn show phase separation properties...

Asphalt pavement possesses the characteristics of strong sunlight absorption, which lead to aging asphalt binder. is one leading causes performance deterioration in pavement, and appearance crystalline wax (paraffin wax) during has a significant effect on optical properties (absorption reflection) In this paper, effects binder were investigated using spectroscopic ellipsometry (SE) technique, new method for quantification was also developed. Cold Lake doped with different contents n-alkanes...

The mechanism of interlayer bonding and its relationship with interface morphology in asphalt pavement is not well understood yet. This study aims at investigating the effect on performance double-layered systems. Four systems were prepared rubberized concrete (RAC), (AC), stone mastic (SMA) mixtures. To test influence different treatments, three conditions studied: styrene-butadiene-styrene (SBS)-modified gravel seal (GS) coat (SBS-GS), rubber-modified (RA-GS), fiber-reinforced...