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.

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

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.

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.

Evaluation of Chemically Stabilized Quarry Byproduct Applications in Base and Subbase Layers through Accelerated Pavement Testing

2019 ◽  
Vol 2673 (3) ◽  
pp. 259-270 ◽  
Author(s):  
Issam I. A. Qamhia ◽  
Erol Tutumluer ◽  
Hasan Ozer ◽  
Heather Shoup ◽  
Sheila Beshears ◽  
...  
Keyword(s):  
Dry Weight ◽  
Flexible Pavement ◽  
Recycled Concrete ◽  
Recycled Aggregates ◽  
Type I ◽  
Soil Pressure ◽  
Wheel Load ◽  
Accelerated Pavement Testing ◽  
Control Section ◽  
Pavement Testing

Research conducted at the Illinois Center for Transportation evaluated sustainable applications of quarry byproducts (QB) or QB blended with coarse recycled aggregates in chemically stabilized base and subbase layers in flexible pavements. In total, eight full-scale test sections, including one conventional flexible pavement with no QB as the control section, were constructed over a subgrade with an engineered strength of 6% California bearing ratio. The test sections were stabilized with either 3% Type I Portland cement or 10% Class C fly ash by dry weight. Fractionated reclaimed asphalt pavements and fractionated recycled concrete aggregates were also used as the recycled coarse aggregates. Based on laboratory tests conducted to determine strength properties of the chemically stabilized samples, QB and recycled aggregates were blended in a ratio of 70% to30% by weight, respectively. A lightweight deflectometer was used to evaluate the quality of the construction and the curing of the test sections. The constructed test sections were then evaluated for performance through accelerated pavement testing (APT) and frequent measurement of surface deformations. The results of APT showed quite a satisfactory rutting performance of all the evaluated QB applications with no observed surface cracking after 135,000 cycles. Four of the test sections were also instrumented with soil pressure cells to measure the wheel load deviator stress on top of the subgrade. The pressure measurements indicated subgrade pressures 3−5 times lower for the stabilized QB sections compared with that of the conventional flexible pavement control section.

Instrumentation to evaluate the field performance of composite overlays using accelerated pavement testing

2017 ◽  
pp. 645-652
Author(s):  
Hashim Rizvi ◽  
Ayman Ali ◽  
Yusuf Mehta ◽  
Andrae Francoise ◽  
Caitlin Purdy ◽  
...  
Keyword(s):  
Field Performance ◽  
Accelerated Pavement Testing ◽  
Pavement Testing
Sign in / Sign up

Export Citation Format

Share Document