Proposed asphalt binder fatigue criteria for various traffic conditions using the LAS or the G-R parameters

2022 ◽  
Vol 55 (1) ◽  
Author(s):  
Hui Chen ◽  
Hussain U. Bahia
Keyword(s):  
Asphalt Binder ◽  
Traffic Conditions

Implementation of the AASHTO M 332 Specification: A Case Study

2020 ◽  
Vol 2674 (9) ◽  
pp. 959-971
Author(s):  
Akshay Gundla ◽  
Ramadan Salim ◽  
B. Shane Underwood ◽  
Kamil E. Kaloush
Keyword(s):  
Experimental Study ◽  
Parameter Uncertainty ◽  
Asphalt Binder ◽  
The State ◽  
Asphalt Binders ◽  
Traffic Conditions ◽  
The Past ◽  
Key Issues ◽  
Temperature Parameter

Over the past 20 years, changes in asphalt binders, the widespread adoption of polymer modified asphalts, and the need to bump asphalt binder grades to consider traffic conditions have exposed the gaps in the AASHTO M 320 specification, and subsequently led to the AASHTO M 332 specification. The State of Arizona initiated an experimental study to explore the possibility of adopting AASHTO M 332 into its binder specifications. In this paper, the specific challenges, technical implications of some key differences in the current Arizona standard compared with the AASHTO M 332 standard, and the approach taken to overcome the differences are explored and documented. Some of the key issues include the shortcomings of the Jnr difference parameter, uncertainty of the pressurized aging vessel (PAV) temperature to be used, effect on the intermediate temperature parameter, |G*|sin δ, and the prospective distribution of asphalt binder grades if the new specification is adopted. Overall, the AASHTO M 332 specification is promising for the State of Arizona with minor changes recommended to prevent changes in binder formulations and influx of asphalt binders inferior to those currently available.

Performance of Grooved Warm-Mix Asphalt Pavement Surfaces under Heavy Aircraft Load and High Tire Pressure

2015 ◽  
Vol 2501 (1) ◽  
pp. 40-45 ◽  
Author(s):  
Mariely Mejías-Santiago ◽  
Jesse D. Doyle ◽  
John F. Rushing
Keyword(s):  
Water Discharge ◽  
Asphalt Binder ◽  
Warm Mix Asphalt ◽  
Skid Resistance ◽  
Tire Pressure ◽  
Curing Conditions ◽  
Foreign Object Damage ◽  
Traffic Conditions ◽  
Scale Experiment ◽  
Binder Aging

This paper presents an evaluation of the performance of grooved warm-mix asphalt (WMA) under heavy aircraft loading compared with that of grooved hot-mix asphalt (HMA). Runway surface grooving is often required to provide high skid resistance for aircraft braking, particularly in wet conditions where hydroplaning must be minimized. An area of potential concern with the use of WMA on the surface of airfield runway pavements is the material response to surface grooving. If the asphalt binder in WMA is softer than that of comparable HMA because of reduced binder aging during production and placement, the WMA mixture may be more likely to experience groove closure or collapse. This condition could result in hydroplaning issues because of the reduction in water discharge and also in chipping of aggregate from the groove edges, which could increase the potential for foreign object damage. A full-scale experiment was designed to evaluate two pavement curing conditions and three WMA mixtures. Traffic was applied to the pavements with an F-15 load cart, and testing occurred during the summer of 2013. The performance of WMA, measured as the percentage of groove closure, was compared with that of comparative HMA. It was concluded that WMA could perform as well as HMA under different pavement curing conditions. This result indicates that WMA runway surface pavement that is properly cured before grooving should not exhibit groove closure under normal aircraft traffic conditions.

Efficacy and acceptance of driver support under possible mismatches between driver's intent and traffic conditions

2006 ◽  
Author(s):  
T. Inagaki ◽  
M. Itoh ◽  
Y. Nagai
Keyword(s):  
Traffic Conditions ◽  
Driver Support

Effects of cognitive distraction on checking traffic conditions for changing lanes

2009 ◽  
Author(s):  
Huiping Zhou ◽  
Makoto Itoh ◽  
Toshiyuki Inagaki
Keyword(s):  
Traffic Conditions ◽  
Cognitive Distraction

Analyze Traffic Conditions and Events with Sound Processing

2020 ◽  
Author(s):  
Anuntapat Anuntachai ◽  
Kittituch Pavaranchanakul
Keyword(s):  
Sound Processing ◽  
Traffic Conditions

Smart Driving System for Improving Traffic Flow

2017 ◽  
Vol 7 (7) ◽  
pp. 236
Author(s):  
Rajesh Kumar Gupta ◽  
L. N. Padhy ◽  
Sanjay Kumar Padhi
Keyword(s):  
Traffic Flow ◽  
Traffic Congestion ◽  
Urban Areas ◽  
Adaptive Cruise Control ◽  
Human Perception ◽  
Cruise Control ◽  
Driving System ◽  
V2v Communication ◽  
Traffic Conditions ◽  
Cooperative Adaptive Cruise Control

Traffic congestion on road networks is one of the most significant problems that is faced in almost all urban areas. Driving under traffic congestion compels frequent idling, acceleration, and braking, which increase energy consumption and wear and tear on vehicles. By efficiently maneuvering vehicles, traffic flow can be improved. An Adaptive Cruise Control (ACC) system in a car automatically detects its leading vehicle and adjusts the headway by using both the throttle and the brake. Conventional ACC systems are not suitable in congested traffic conditions due to their response delay.  For this purpose, development of smart technologies that contribute to improved traffic flow, throughput and safety is needed. In today’s traffic, to achieve the safe inter-vehicle distance, improve safety, avoid congestion and the limited human perception of traffic conditions and human reaction characteristics constrains should be analyzed. In addition, erroneous human driving conditions may generate shockwaves in addition which causes traffic flow instabilities. In this paper to achieve inter-vehicle distance and improved throughput, we consider Cooperative Adaptive Cruise Control (CACC) system. CACC is then implemented in Smart Driving System. For better Performance, wireless communication is used to exchange Information of individual vehicle. By introducing vehicle to vehicle (V2V) communication and vehicle to roadside infrastructure (V2R) communications, the vehicle gets information not only from its previous and following vehicle but also from the vehicles in front of the previous Vehicle and following vehicle. This enables a vehicle to follow its predecessor at a closer distance under tighter control.

Black Spot Identification and Audit Analysis for Heterogeneous Traffic Conditions in Hyderabad City � a Case Study

2015 ◽  
Vol 4 (3) ◽  
pp. 34-42
Author(s):  
T. Sri Lakshmi Sowmya ◽  
◽  
A. Ramesh ◽  
B.N.M. Rao ◽  
M. Kumar ◽  
...  
Keyword(s):  
Black Spot ◽  
Heterogeneous Traffic ◽  
Traffic Conditions

A Hybrid Model to Predict the Gyratory Compaction of Hot Mixed Asphalt

2019 ◽  
Author(s):  
Teng Man
Keyword(s):  
Hybrid Model ◽  
Asphalt Binder ◽  
Asphalt Mixture ◽  
Aggregate Size ◽  
Asphalt Mixtures ◽  
Compaction Process ◽  
Particle Rearrangement ◽  
Compaction Behavior ◽  
Grain Size Distributions ◽  
Gyratory Compaction

The compaction of asphalt mixture is crucial to the mechanical properties and the maintenance of the pavement. However, the mix design, which based on the compaction properties, remains largely on empirical data. We found difficulties to relate the aggregate size distribution and the asphalt binder properties to the compaction behavior in both the field and laboratory compaction of asphalt mixtures. In this paper, we would like to propose a simple hybrid model to predict the compaction of asphalt mixtures. In this model, we divided the compaction process into two mechanisms: (i) visco-plastic deformation of an ordered thickly-coated granular assembly, and (ii) the transition from an ordered system to a disordered system due to particle rearrangement. This model could take into account both the viscous properties of the asphalt binder and grain size distributions of the aggregates. Additionally, we suggest to use the discrete element method to understand the particle rearrangement during the compaction process. This model is calibrated based on the SuperPave gyratory compaction tests in the pavement lab. In the end, we compared the model results to experimental data to show that this model prediction had a good agreement with the experiments, thus, had great potentials to be implemented to improve the design of asphalt mixtures.

PERFORMANCE EVALUATION OF CONSECUTIVE SIGNALIZED INTERSECTIONS UNDER HETEROGENEOUS TRAFFIC CONDITIONS IN CAIRO, EGYPT

2018 ◽  
Vol 74 (5) ◽  
pp. I_1207-I_1218
Author(s):  
Sherif SHOKRY ◽  
Shinji TANAKA ◽  
Fumihiko NAKAMURA ◽  
Ryo ARIYOSHI ◽  
Shino MIURA
Keyword(s):  
Performance Evaluation ◽  
Signalized Intersections ◽  
Heterogeneous Traffic ◽  
Traffic Conditions
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