Accelerated Pavement Testing of Rutting Performance of Two Caltrans Overlay Strategies

2000 ◽  
Vol 1716 (1) ◽  
pp. 116-125 ◽  
Author(s):  
John Harvey ◽  
Lorina Popescu
Keyword(s):  
Elevated Temperatures ◽  
Void Content ◽  
Accelerated Pavement Testing ◽  
Asphalt Rubber ◽  
Vehicle Simulator ◽  
Pavement Temperature ◽  
Pavement Testing ◽  
C 50 ◽  
Air Void ◽  
Heavy Vehicle Simulator

Results of accelerated pavement tests (APT) at elevated temperatures on dense graded asphalt concrete and gap-graded asphalt rubber hot mix (ARHM-GG) are presented. APT testing was performed by use of a Caltrans heavy vehicle simulator. The overlays were placed on previously untrafficked sections of an existing flexible pavement. Variables included in the experiment were overlay type, ARHM-GG overlay thickness, tire/wheel type (dual/bias-ply; dual/radial, wide-base single, aircraft), and pavement temperature (40°C, 50°C, at 50 mm depth). Results presented include the rut development for the different variables, changes in layer thickness, and changes in air-void content. Analyses were performed for evaluating the relative contributions of shear deformation and densification to rut development.

Performance of Dowel Bar Retrofitted Concrete Pavement Under Heavy Vehicle Simulator Loading

2003 ◽  
Vol 1823 (1) ◽  
pp. 141-152 ◽  
Author(s):  
John T. Harvey ◽  
Lorina Popescu ◽  
Abdikarim Ali ◽  
David Bush
Keyword(s):  
Load Transfer ◽  
Heavy Vehicle ◽  
California Department ◽  
Accelerated Pavement Testing ◽  
Control Section ◽  
Vehicle Simulator ◽  
Pavement Testing ◽  
Load Transfer Efficiency ◽  
Dowel Bar ◽  
Heavy Vehicle Simulator

The California Department of Transportation uses dowel bar retrofit (DBR) as a rehabilitation strategy for concrete pavements. Two test sections were retrofitted with dowel bars and a third section was designated as a control on US-101 near Ukiah, California. All three sections were subjected to accelerated pavement testing by using the Heavy Vehicle Simulator (HVS). The results obtained with the HVS demonstrated a large improvement in load transfer efficiency (LTE) and decreases in maximum vertical deflections and vertical deflection differences from DBR. LTE was not damaged by trafficking on the sections with DBR and was less sensitive to temperature changes than the control section. Falling weight deflectometer testing showed damage to the interlock at the joint on the control section and no damage on the sections with DBR. Joint and crack deflections and deflection differences increased with trafficking. A total equivalent loading of approximately 11,000,000 equivalent single-axle loads was applied to each of the sections with DBR without failure occurring.

Rut Initiation Mechanisms in Asphalt Mixtures as Generated under Accelerated Pavement Testing

2005 ◽  
Vol 1940 (1) ◽  
pp. 136-145 ◽  
Author(s):  
Salil Gokhale ◽  
Bouzid Choubane ◽  
Tom Byron ◽  
Mang Tia
Keyword(s):  
Asphalt Mixtures ◽  
Department Of Transportation ◽  
Accelerated Pavement Testing ◽  
Subsequent Investigation ◽  
Florida Department ◽  
Vehicle Simulator ◽  
Pavement Testing ◽  
Modified Binder ◽  
Styrene Butadiene ◽  
Heavy Vehicle Simulator

The Florida Department of Transportation (FDOT) conducted an experiment to address the effects of polymer modifiers on the performance of Superpave® mixes by using a heavy vehicle simulator. Two fine-graded Superpave mixes were considered. One mix included a virgin binder meeting the requirements of PG 67-22, and the other contained a styrene– butadiene–styrene polymer (SBS)-modified binder meeting those of PG 76-22. Both respective mixes contained the same effective binder content, aggregate components, and gradation. The mixes were designed for 10 million to 30 million equivalent single-axle loads with the use of the standard Superpave mix design methodology. During placement of these mixes, all standard FDOT density requirements and acceptance criteria were applicable. The subsequent investigation showed that the sections with SBS-modified mixture significantly outperformed those with the unmodified mixture. It was also determined that rutting in the unmodified mixture was primarily a function of shear flow, whereas rutting in the SBS-modified mixture was caused mainly by densification. This paper presents a description of the testing program, the data collection effort, and the subsequent analyses and findings, focusing primarily on the initiation mechanisms of rutting in asphalt mixtures as generated and observed under accelerated pavement testing.

Accelerated testing of super lightweight UHPC waffle deck under heavy vehicle simulator

2021 ◽  
Vol 16 (2-3) ◽  
pp. 61-74
Author(s):  
Sahar Ghasemi ◽  
Amir Mirmiran ◽  
Yulin Xiao ◽  
Kevin Mackie
Keyword(s):  
High Performance ◽  
Failure Modes ◽  
High Performance Concrete ◽  
High Strength ◽  
Heavy Vehicle ◽  
Wheel Load ◽  
Element Analysis ◽  
Vehicle Simulator ◽  
Pavement Testing ◽  
Heavy Vehicle Simulator

A super lightweight deck can enhance load rating and functionality of a bridge, especially those identified as structurally deficient. This study was aimed to develop and experimentally validate a novel bridge deck as an ultra-lightweight low-profile waffle slab of ultra-high-performance concrete (UHPC) with either carbon fiber reinforced polymer (CFRP) or high strength steel (HSS) reinforcement. The proposed system lends itself to accelerated bridge construction, rapid deck replacement in bridges with load restrictions, and bridge widening applications without the need to replace girders. Performance and failure modes of the proposed deck were initially assessed through extensive lab experiments and finite element analysis, which together confirmed that the proposed deck panel meets the AASHTO LRFD requirements. The proposed deck system is not susceptible to punching shear of its thin slab and fails in a rather ductile manner. To evaluate its long-term performance, the system was further tested under the dynamic impact of wheel load at the Accelerated Pavement Testing (APT) facility of the Florida Department of Transportation using a Heavy Vehicle Simulator (HVS).

scholarly journals A GPR-Based Pavement Density Profiler: Operating Principles and Applications

2021 ◽  
Vol 13 (13) ◽  
pp. 2613
Author(s):  
Nectaria Diamanti ◽  
A. Peter Annan ◽  
Steven R. Jackson ◽  
Dylan Klazinga
Keyword(s):  
Asphalt Pavement ◽  
Wave Impedance ◽  
Asphalt Mixtures ◽  
Void Content ◽  
Air Voids ◽  
New Instrument ◽  
Pavement Engineering ◽  
And Performance ◽  
Air Void ◽  
Air Void Content

Density is one of the most important parameters in the construction of asphalt mixtures and pavement engineering. When a mixture is properly designed and compacted, it will contain enough air voids to prevent plastic deformation but will have low enough air void content to prevent water ingress and moisture damage. By mapping asphalt pavement density, areas with air void content outside of the acceptable range can be identified to predict its future life and performance. We describe a new instrument, the pavement density profiler (PDP) that has evolved from many years of making measurements of asphalt pavement properties. This instrument measures the electromagnetic (EM) wave impedance to infer the asphalt pavement density (or air void content) locally and over profiles.

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