A5082430048- Asphalt Pavement Performance Evaluation
- Infrastructure Maintenance and Monitoring
- Geotechnical Engineering and Underground Structures
- Transport Systems and Technology
- Ionosphere and magnetosphere dynamics
- Smart Materials for Construction
- Earthquake Detection and Analysis
- Innovative concrete reinforcement materials
- Concrete Corrosion and Durability
- GNSS positioning and interference
- Geomagnetism and Paleomagnetism Studies
- Material Properties and Failure Mechanisms
- Concrete Properties and Behavior
- Grouting, Rheology, and Soil Mechanics
- Tunneling and Rock Mechanics
- Polymer Nanocomposites and Properties
- Nuclear and radioactivity studies
- Epoxy Resin Curing Processes
- Structural Analysis of Composite Materials
- Non-Destructive Testing Techniques
- Powder Metallurgy Techniques and Materials
- Hydrogen embrittlement and corrosion behaviors in metals
- Transportation Safety and Impact Analysis
- Geophysical Methods and Applications
- Engineering Structural Analysis Methods
Auburn University
2017-2025
Asphalt Institute
2017-2023
Texas A&M University
2014-2017
Texas A&M University System
2015-2016
China Academy of Engineering Physics
2014
Chinese Academy of Engineering
2014
Wuhan University
2006-2012
Institute of Geodesy and Geophysics
2011-2012
GFZ Helmholtz Centre for Geosciences
2006
The Hamburg wheel tracking test (HWTT) has been widely used as a standard laboratory to evaluate the moisture susceptibility and rutting resistance of asphalt mixtures. stripping infection point rut depth at certain number load cycles are two common parameters obtained from test. Although these have adopted by several transportation agencies, accuracy variability in characterizing mixture properties questioned. In this study, novel method analyze HWTT results is introduced three new proposed...
Although the use of high reclaimed asphalt pavement (RAP) and recycled shingles (RAS) contents in mixtures is desirable for environmental economic reasons, these are prone to cracking, ravelling, other durability-related distresses mainly due heavily aged binders. Highway agencies paving industry have been exploring recycling agents (RA) order produce with performance. This study focused on characterising long-term rejuvenating effectiveness RA blends RAP RAS contents. Materials from two...
Ageing of asphalt mixtures occurs during production and construction continues throughout the service life pavement. Although this topic has been studied extensively, recent changes in mixture components, parameters, plant design have raised a need for comprehensive evaluation that considers impacts climate, aggregate type, recycled materials, WMA technology, temperature. In study, field cores were acquired from seven projects at several months afterwards, raw materials also collected...
Economic and environmental considerations have prompted the use of reclaimed asphalt pavement (RAP) recycled shingles (RAS) in mixtures. However, given concerns about long-term performance, state departments transportation (DOTs) tend to limit quantities these materials unless certain mixture modifications are made [e.g., a softer virgin binder performance grade (PG) warm-mix technology, addition recycling agent (RA), or any combination modifications]. This study focused on stiffness...
This study evaluated the short-term performance properties and predicted cracking of asphalt mixtures containing polymer-modified (PMA) binders recycled polyethylene (RPE). To that end, binder rheological testing, mixture FlexPAVE simulations were conducted. Furthermore, three PMA selected for field evaluation on National Center Asphalt Technology Test Track rapid testing during production. The modified with styrene-butadiene-styrene (SBS), reactive elastomeric terpolymer (RET),...
The objective of this study was to select a laboratory loose mix aging protocol for the NCAT top-down cracking (TDC) experiment. Field asphalt mixtures characterized using cumulative degree-days (CDD), which defined as accumulation daily high temperature throughout mixtures’ service life. Performance data from over 80 existing pavements showed that TDC typically initiated after critical field condition approximately 70,000 CDD. A experiment conducted an representative Materials used in were...
The use of recycling agents has become a common practice to produce asphalt mixtures with high contents reclaimed materials. Previous studies have shown that characterisation rejuvenated blends using empirical tests, used for evaluation ordinary bituminous binders in accordance EN 12591, might not be sufficient. It was also proven if the aged binder is restored one parameter such as penetration or softening point, it does necessarily mean other rheological properties are same way. For this...
The Hamburg wheel-tracking test (HWTT) is commonly used to evaluate the rutting resistance and moisture susceptibility of asphalt mixtures. Over years, different parameters have been proposed, including traditional ones specified in AASHTO T 324 several alternatives developed by researchers. This study was undertaken refine HWTT method toward enhancing its implementation as part balanced mix design specifications for A database results over 70 mixtures with a wide range mixture components...
This paper introduces the new RILEM Technical Committee on Alternative Paving Materials – Design and Performance (TC APD), which builds upon foundational efforts of former TC 279-WMR focused Valorisation Waste Secondary for Roads. The APD aims to advance understanding alternative paving materials, emphasizing their design performance as essential components road composites. committee addresses three areas investigation, each dedicated examining current technological state art, process field...
Abstract. This study concentrates on the characteristics of field-aligned currents (FACs) in both hemispheres during extreme storms October and November 2003. High-resolution CHAMP magnetic data reflect dynamics FACs these geomagnetic storms, which are different from normal periods. The peak intensity most equatorward location response to storm phases examined separately for hemispheres, as well dayside nightside. corresponding large-scale FAC densities are, average, enhanced by about a...
There is a need for more rapid system of evaluation and implementation new existing asphalt additives, especially because the prohibitive cost full-scale performance evaluations. To help to meet this need, Additive Group (AG) experiment at National Center Asphalt Technology (NCAT) was developed began in 2021. A comprehensive laboratory six mixtures, each modified with popular additive type selected by AG state DOT sponsors, conducted. Simultaneously, test sections were constructed NCAT track...
This study aims to investigate promising mitigation strategies for improving the cracking performance of high recycled binder ratio (RBR) asphalt mixtures. Moisture-resistant aggregates that do not require anti-stripping agents, reclaimed pavement (RAP), and shingles (RAS) were sampled this from sources in two climatic zones, south north. The south-moisture-resistant (SR) mixtures designed with 0.16 0.29 RBRs RAP, while north-moisture-resistant (NR) included 0.21 0.37 RAP 0.44 RBR RAP/RAS....
This study evaluated the performance of two recycled-plastic-modified (RPM) asphalt mixtures versus a nonplastic control mixture through laboratory testing, FlexPAVE™ simulations, and accelerated pavement testing at National Center for Asphalt Technology (NCAT) Test Track. One RPM used wet process adding linear low-density polyethylene (LLDPE) binder modification, other dry LLDPE modification using drop-in approach. The modified by styrene-butadiene-styrene. Each was produced in an plant...
The economic and environmental benefits of incorporating recycled asphalt materials (RAMs) into new mixtures are achieved only if the durability is maintained. This study, conducted under National Cooperative Highway Research Program project 09-65, aims to evaluate with high RAM contents, considering component materials, mitigation strategies, balanced performance. evaluation included existing mix designs variable contents typically produced in each U.S. climatic zone (north/freeze south/no...
The Georgia Department of Transportation (GDOT) implemented the corrected optimum asphalt content (COAC) approach to reducing allowable reclaimed pavement (RAP) binder contribution for improving mixture durability. COAC 60:40 in 2019 allows 60% RAP be credited total mix, requiring additional virgin equivalent 40% added volumetric content. To further enhance durability mixtures, GDOT plans implement indirect tensile cracking test (IDEAL-CT) balanced mix design (BMD) method conjunction with...
Warm-mix asphalt (WMA) technologies aid in reducing mixing and compaction temperatures for concrete mixtures, allowing savings fuel consumption extending haul distances construction season. The reduced also provide a greener technology as emissions are lowered at the plant site. Engineering environmental benefits promoted rapid implementation of WMA technologies, but concerns remain regarding difference mixture performance versus hot-mix (HMA) because changes production process, specifically...
Mechanical foaming has become the most popular method for producing warm-mix asphalt in United States. The process of mixing cold water with hot binder results volume expansion and subsequent viscosity reduction binder, which is likely to produce a better coating aggregates along improved overall mixture workability. Although mechanical been widely used recent years, questions persist regarding effects that different amounts have on characteristics foamed properties. This study developed...