Thickness and Density Prediction of Thin Asphalt Concrete Overlay Using GPR

2018 ◽  
Author(s):  
Shan Zhao ◽  
◽  
Siqi Wang ◽  
Imad L. Al-Qadi
Keyword(s):  
Asphalt Concrete ◽  
Density Prediction

Signal Stability and the Height-Correction Method for Ground-Penetrating Radar In Situ Asphalt Concrete Density Prediction

2021 ◽  
pp. 036119812110045
Author(s):  
Qingqing Cao ◽  
Imad L. Al-Qadi
Keyword(s):  
Adaptive Filter ◽  
Ground Penetrating Radar ◽  
Asphalt Concrete ◽  
Correction Method ◽  
Least Square ◽  
Least Mean Square ◽  
Signal Stability ◽  
Density Prediction ◽  
Ground Penetrating ◽  
The Impact

Ground-penetrating radar (GPR) has shown great potential for asphalt concrete density prediction used in quality control and quality assurance. One challenge of continuous GPR measurements is that the measured dielectric constant could be affected by signal stability and antenna height. This would jeopardize the accuracy of the asphalt concrete density prediction along the pavement. In this study, signal instability and shifting antenna height during continuous real-time GPR measurements were identified as main sources of error. After using a bandpass filter to preprocess the signal, a least-square adaptive filter, using gradient descent and least mean square methods, was developed to reconstruct the received signal to improve its stability. In addition, simulations were performed to evaluate the impact of geometric spreading caused by shifting antenna height during testing. A height correction was developed using a power model to correct the height-change impact. The proposed filter and height-correction method were assessed using static and dynamic tests. The least-square adaptive filter improved signal stability by 50% and the height-correction method removed the effect of shifting antenna height almost entirely.

Cyclic Elasto-viscoplastic Model for Asphalt Concrete Materials

2007 ◽  
Vol 8 (2) ◽  
pp. 239-255
Author(s):  
Dang-Truc Nguyen ◽  
Boumediene Nedjar ◽  
Philippe Philippe
Keyword(s):  
Asphalt Concrete ◽  
Viscoplastic Model ◽  
Concrete Materials

A NEW SIMPLE DAMAGE ACCUMULATION MODEL FOR PREDICTING OF AN ASPHALT CONCRETE CYCLIC STRENGTH

2018 ◽  
Vol 431 (5) ◽  
pp. 38-47
Author(s):  
A. I. Iskakbayev ◽  
◽  
Bagdat Teltayev ◽  
Rossi C. Oliviero ◽  
K. Estayev ◽  
...  
Keyword(s):  
Asphalt Concrete ◽  
Damage Accumulation ◽  
Cyclic Strength ◽  
Accumulation Model ◽  
Damage Accumulation Model
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