Fast Falling Weight Accelerated Pavement Testing and Laboratory Analysis of Asphalt Pavements Reinforced with Geocomposites

2019 ◽  
pp. 417-430 ◽  
Author(s):  
Davide Ragni ◽  
Tony Montillo ◽  
Alessandro Marradi ◽  
Francesco Canestrari
Keyword(s):  
Laboratory Analysis ◽  
Asphalt Pavements ◽  
Accelerated Pavement Testing ◽  
Pavement Testing ◽  
Falling Weight

Detection and Monitoring of Cracks in Asphalt Pavement Under Texas Mobile Load Simulator Testing

1997 ◽  
Vol 1570 (1) ◽  
pp. 10-22 ◽  
Author(s):  
N.-K. J. Lee ◽  
F. Hugo ◽  
K. H. Stokoe
Keyword(s):  
Surface Layer ◽  
Longitudinal Direction ◽  
Main Mode ◽  
Accelerated Pavement Testing ◽  
Surface Cracking ◽  
Longitudinal Stiffness ◽  
Load Simulator ◽  
Surface Distress ◽  
Pavement Testing ◽  
Falling Weight

The Texas mobile load simulator (TxMLS) is a newly developed accelerated pavement testing device used to evaluate pavement performance under real trafficking loads. This evaluation is performed by applying trafficking loads and monitoring surface distress, such as cracking and rutting, in conjunction with a number of other measurements of the pavement, such as those conducted with the falling weight deflectometer, multidepth deflectometer, strain gauge, pressure cells, and seismic (stress-wave) tests. A procedure for monitoring the progressive degradation of the asphalt surface was developed using the spectral-analysis-of-surface-waves (SASW) technique. This procedure was applied with the TxMLS and proved to be equally effective. SASW tests that were performed intermittently between trafficking phases on trafficked and untrafficked areas show ( a) the effect of temperatures and frequencies on the asphalt moduli, ( b) the importance of temperature and frequency corrections in analyzing the degradation of the asphalt surface layer, and ( c) the long-term trends in surface-wave velocities (and hence, moduli) of the surface layer with increasing number of load applications. It was found that stiffness of the asphalt layer in the longitudinal direction was progressively reduced under trafficking. Concurrently, surface cracking progressively increased. The reduction in longitudinal stiffness occurred at a faster rate than the crack growth. In contrast, the reduction in the stiffness of the asphalt layer in the transverse direction was slower, probably because the main mode of cracking was transverse. The feasibility of using SASW testing as a predictor of degradation and imminent cracking was confirmed with these studies.

Fast falling weight deflectometer as new tool to perform accelerated pavement testing

2020 ◽  
Vol 173 (6) ◽  
pp. 396-409 ◽  
Author(s):  
Marco Francesconi ◽  
Martyn Stonecliffe-Jones ◽  
Sadaf Khosravifar ◽  
Mario Manosalvas-Paredes ◽  
Albert Navarro Comes ◽  
...  
Keyword(s):  
Falling Weight Deflectometer ◽  
Accelerated Pavement Testing ◽  
Pavement Testing ◽  
Falling Weight

Fast Falling Weight Deflectometer (FastFWD) for Accelerated Pavement Testing (APT)

2017 ◽  
pp. 2235-2241 ◽  
Author(s):  
M. Manosalvas-Paredes ◽  
A. Navarro Comes ◽  
M. Francesconi ◽  
S. Khosravifar ◽  
P. Ullidtz
Keyword(s):  
Falling Weight Deflectometer ◽  
Accelerated Pavement Testing ◽  
Pavement Testing ◽  
Falling Weight

Mechanistic Analyses and Modeling of Pavement Sections Utilizing Sustainable Aggregate Quarry By-Product Applications

2020 ◽  
Vol 2674 (10) ◽  
pp. 614-627
Author(s):  
Issam I. A. Qamhia ◽  
Erol Tutumluer ◽  
Hasan Ozer ◽  
Pranshoo Solanki
Keyword(s):  
Structural Response ◽  
Field Performance ◽  
Fe Analysis ◽  
Falling Weight Deflectometer ◽  
Accelerated Pavement Testing ◽  
Performance Trends ◽  
Control Section ◽  
Pavement Testing ◽  
Falling Weight ◽  
Sensor Errors

This paper presents a modeling study based on finite element (FE) analysis to mechanistically evaluate flexible pavements constructed with quarry by-products (QB). Twelve pavement test sections, a control section, and 11 others incorporating QB as unbound subgrade replacement and chemically stabilized base/subbase applications were evaluated for field performance using accelerated pavement testing (APT). First, falling weight deflectometer (FWD) deflection basin parameters were calculated and compared with critical pavement responses to evaluate the structural adequacies of the QB pavement sections. The moduli of the constructed pavement layers were then backcalculated from the FWD deflections using the GT-PAVE FE analysis program with nonlinear and cross-anisotropic layer characterizations. For stabilized QB applications, the layer properties calculated from this analysis for the base/subbase layers were used to calculate critical pavement responses. The sections were compared using a response benefit parameter, defined as the ratio of maximum resilient surface deflection in a conventional pavement, as the control section, to that obtained for each section having a certain QB application in consideration. According to the results obtained from the APT sections and the mechanistic FE analyses, the measured and calculated FWD deflection basins were successfully matched with individual sensor errors not exceeding 5% for all 12 test sections. The calculated response benefits indicated significant advantages for using cement-stabilized QB applications over fly ash-stabilized QB applications and conventional flexible pavement sections. Considering the pavement structural response benefits and good performance trends observed, major cost benefits can be realized by routine use of these sustainable QB applications.

EVALUATION OF RUTTING PERFORMANCE OF HOT MIX ASPHALT CONTAINING POLYMER ADDITIVES

2020 ◽  
Vol 2 (2) ◽  
pp. 127-132
Author(s):  
Ahmed Eltwati ◽  
Alaa A. A. Elkaseh
Keyword(s):  
Asphalt Mixtures ◽  
Asphalt Pavements ◽  
Structural Performance ◽  
Accelerated Pavement Testing ◽  
Modified Asphalt ◽  
Resistance To Deformation ◽  
Traffic Volumes ◽  
Pavement Testing ◽  
Polymer Modified Asphalt ◽  
Run Up

In recent decades, escalating traffic volumes initiate asphalt pavements revealed to larger stresses, which can create premature distresses. To enhance the resistance to distresses, modification of the asphalt mixtures has been studied extensively. The objective of this paper is to evaluate the performance of asphalt pavement made with various bitumen types and also different thicknesses. The bitumen types used were conventional asphalt (Ac 60-70) and polymer modified asphalt (PG 76-22). The thickness of asphalt samples tested was 70, 80, and 90 mm. In this study, Accelerated Pavement Testing (APT) was conducted to evaluate the rut depth in the surface of the pavement. The experiment was run up to 20,000 cycles. The results revealed polymer has a significant effect on pavement resistance to rutting. The resistance can be increased by up to 30%. In addition, the rutting occurred rapidly for the first 3,000 cycles. Beyond 3,000, the deformation is increased slowly.  On the other side, the results showed that as the HMA thickness increases as the resistance to deformation increases. We, therefore, can conclude that adding particles of polymer to HMA could improve the structural performance of pavement i.e. rutting resistance and reduce the thickness of the surface

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