Accelerated Pavement Testing to Evaluate the Reinforcement Effect of Geogrids in Flexible Pavements

2020 ◽  
Vol 2674 (10) ◽  
pp. 134-145
Author(s):  
Bingye Han ◽  
Pawel Polaczyk ◽  
Hongren Gong ◽  
Rong Ma ◽  
Yuetan Ma ◽  
...  
Keyword(s):  
Permanent Deformation ◽  
Flexible Pavements ◽  
Performance Testing ◽  
Base Layer ◽  
Reinforcement Effect ◽  
Accelerated Pavement Testing ◽  
Forensic Evaluations ◽  
Base Course ◽  
Pavement Testing ◽  
Response Testing

This study presents an accelerated pavement testing (APT) to evaluate the reinforcement effect of geogrids in flexible pavements. A full-scale conventional three-layer flexible pavement structure was constructed, and was divided into one unreinforced section and two reinforced sections with base reinforced by geogrids placed at different depth of base course. The testing program was divided into three parts: performance testing, response testing, and forensic evaluations. The performance testing recorded the development of surface permanent deformation with the number of loadings. The falling weight deflectometer (FWD) was employed to investigate deflections and moduli of flexible pavements in the response testing. The excavation of pavements was to further analyze reinforcement mechanisms. Test results demonstrated the benefits of incorporating geogrids in base course in reducing the permanent deformation and improving the modulus of base course. Compared with the unreinforced section, accumulated permanent deformations in the two reinforced sections decreased significantly, with a drop of 13%–37%, and the back-calculated moduli of the reinforced base increased by 58%–78% after APT. It was possible that sufficient permanent deformation was needed for mobilizing geogrids to constrain lateral movements of granular particles, to increase the overall structural behavior of the reinforced base course, and to improve the stress distribution on the subgrade. These interaction mechanisms were also confirmed in the pavement trench. For a pavement system consisting of a thin surface and base layer, the proper placement position of geogrids was at the base–subgrade interface for this test and loading arrangement.

Prediction of In-Service Fatigue Life of Flexible Pavements Based on Accelerated Pavement Testing

2009 ◽  
Vol 37 (5) ◽  
pp. 000338 ◽  
Author(s):  
M. R. Mitchell ◽  
R. E. Link ◽  
Runhua Guo ◽  
Jorge A. Prozzi
Keyword(s):  
Fatigue Life ◽  
Flexible Pavements ◽  
Accelerated Pavement Testing ◽  
Pavement Testing

Prediction of permanent deformation in full-scale accelerated pavement testing

2012 ◽  
Vol 16 (4) ◽  
pp. 579-585 ◽  
Author(s):  
Young-Chan Suh ◽  
Dae-Wook Park ◽  
Nam-Hyun Jo ◽  
Soo-Ahn Kwon
Keyword(s):  
Permanent Deformation ◽  
Full Scale ◽  
Accelerated Pavement Testing ◽  
Pavement Testing

Reinforcement Tensile Behavior under Cyclic Moving Wheel Loads

2013 ◽  
Vol 2363 (1) ◽  
pp. 113-121 ◽  
Author(s):  
Xiaochao Tang ◽  
Angelica M. Palomino ◽  
Shelley M. Stoffels
Keyword(s):  
Permanent Deformation ◽  
Longitudinal Direction ◽  
Flexible Pavement ◽  
Strain Gauges ◽  
Clear Correlation ◽  
Accelerated Pavement Testing ◽  
Traffic Loading ◽  
Individual Strain ◽  
Pavement Testing ◽  
The Individual

Numerous studies have revealed the benefits of using geogrids in a flexible pavement, especially for reducing permanent deformation. One of the questions that remain about the effectiveness of a geogrid in reinforcing of pavement is the extent to which the geogrid is engaged and mobilized throughout its service. This paper presents results of a laboratory study on various geogrid products embedded in flexible-pavement sections. The laboratory-scale pavement sections were subjected to cyclic moving wheel loads by using reduced-scale accelerated pavement testing (APT). During the APT, strains that developed in the geogrids were measured at intervals of loading applications by strain gauges installed in pairs on the upper and lower surfaces of the geogrid ribs. Permanent deformation of the subgrade was also measured at the same intervals of loading applications. The measurements of geogrid strains throughout the construction process indicated that the construction resulted in a considerable prestressing effect on the geogrids. Measurements from the individual strain gauges in pairs showed that the gauges installed on the upper surfaces of the ribs were in compression while those on the lower surfaces were in tension; the situation suggested a significant effect on the flexural deflection of the ribs on the tensile strain measurements from the strain gauges. Furthermore, it was observed that geogrid ribs in the longitudinal direction of traffic loading were not mobilized, while considerable strains were developed in geogrid ribs in the direction transverse to traffic loading. A clear correlation was found between the reinforcing forces developed in the geogrids and the performance of the reinforced subgrade in relation to resisting permanent deformation.

Prediction of Pavement Fatigue for California Department of Transportation Accelerated Pavement Testing Program Drained and Undrained Test Sections

1996 ◽  
Vol 1540 (1) ◽  
pp. 105-114
Author(s):  
Fenella Long ◽  
John Harvey ◽  
Clark Scheffy ◽  
Carl L. Monismith
Keyword(s):  
Fatigue Life ◽  
Laboratory Testing ◽  
Testing Procedure ◽  
Base Layer ◽  
Department Of Transportation ◽  
California Department ◽  
Accelerated Pavement Testing ◽  
Actual Performance ◽  
Pavement Structures ◽  
Pavement Testing

The use of laboratory testing and mechanistic analysis to predict the fatigue life of the California Department of Transportation accelerated pavement testing (CAL/APT) heavy vehicle simulator (HVS) test sections is investigated. Two pavement structures are investigated: a drained pavement that includes an asphalt-treated permeable base layer and an undrained conventional asphalt concrete pavement. The fatigue life under HVS accelerated loading for both sections is predicted using the laboratory testing procedure from SHRP A-003A, which is based on tests of actual pavement samples using the flexural fatigue beam test. This fatigue life is compared with predictions from the SHRP A-003A surrogate equation for flexural testing, the Shell model, and the Asphalt Institute model. The critical tensile strains for the fatigue calculations using the models investigated were determined using linear elastic theory. Ranges of moduli for the pavement layers were determined from extensive material testing, and 24 moduli combinations were made. The effect of pavement type, changes in moduli, and the HVS loading conditions on the tensile strain and fatigue life predictions between the models is discussed. Reasons for differences between predicted fatigue lives and their implications are also discussed. Predicted fatigue life is compared with actual performance under HVS loading for the drained pavement.

Sign in / Sign up

Export Citation Format

Share Document