Influence of Bedrock on the Dynamic Deflection Response and Dynamic Back-Calculation Results of Asphalt Pavement: Insights from the Numerical Simulation of Falling Weight Deflectometer Tests

2021 ◽  
Author(s):  
Yujing Wang ◽  
Yanqing Zhao ◽  
Mengyuan Zhang ◽  
Guozhi Fu
Keyword(s):  
Numerical Simulation ◽  
Asphalt Pavement ◽  
Falling Weight Deflectometer ◽  
Calculation Results ◽  
Back Calculation ◽  
Falling Weight

Modulus Back-Calculation Based on FWD Dynamic Deflection Basin for Semi-Rigid Base Asphalt Pavement

2014 ◽  
Vol 587-589 ◽  
pp. 1062-1066
Author(s):  
Chuan Yi Zhuang ◽  
Ya Li Ye
Keyword(s):  
Fly Ash ◽  
Asphalt Pavement ◽  
Rigid Base ◽  
Falling Weight Deflectometer ◽  
Loading Test ◽  
Response Characteristics ◽  
Rate Of Decay ◽  
Back Calculation ◽  
Pavement Response ◽  
Falling Weight

To study semi-rigid base asphalt pavement response characteristics, two structural APT test roads of cement stabilized aggregate and lime fly-ash stabilized aggregate were constructed, and accelerated loading test was developed. After certain number of wheel loads (70,000 times) pavement deflection basin parameters were detected by using the falling weight deflectometer, then modulus of each pavement layer was back-calculated, dynamic response was analyzed. Studies have shown that the modulus of semi-rigid base decay faster, and with decreasing thickness of the semi-rigid base, the greater the rate of decay of modulus; cement stabilized aggregate decay rate is greater than that of lime fly-ash stabilized aggregate.

Effectiveness of static and dynamic backcalculation approaches for asphalt pavement

2020 ◽  
Vol 47 (7) ◽  
pp. 846-855
Author(s):  
Dandan Cao ◽  
Changjun Zhou ◽  
Yanqing Zhao ◽  
Guozhi Fu ◽  
Wanqiu Liu
Keyword(s):  
Asphalt Concrete ◽  
Elastic Moduli ◽  
Complex Modulus ◽  
Asphalt Pavement ◽  
Falling Weight Deflectometer ◽  
Fixed Frequency ◽  
Dynamic Approach ◽  
Layer Effect ◽  
Static Approach ◽  
Falling Weight

In this study, the field falling weight deflectometer (FWD) data for asphalt pavement with various base types were backcalculated through dynamic and static backcalculation approaches, and the effectiveness of backcalculation approaches was studied. Asphalt concrete (AC) was treated as a viscoelastic material and the complex modulus was obtained using the dynamic approach. The dynamic modulus at a fixed frequency was computed for comparison purposes. The coefficient of variance and the compensating layer effect were assumed as two characteristics for the effectiveness of backcalculation approaches. The results show that the layer property from the dynamic backcalculation approach for different stations were more consistent and showed smaller coefficient of variance, which were more appropriate for the characterization pavement behavior. The elastic moduli from the static approach were more variable and exhibited a compensating layer effect in which a portion of the modulus of one layer was backcalculated into other layers. The dynamic approach is more effective than static approaches in backcalculation of layer properties.

Interpretation of Transverse Profiles to Determine the Source of Rutting within an Asphalt Pavement System

2005 ◽  
Vol 1905 (1) ◽  
pp. 73-81 ◽  
Author(s):  
Claude Villiers ◽  
Reynaldo Roque ◽  
Bruce Dietrich
Keyword(s):  
Surface Layer ◽  
Literature Review ◽  
Asphalt Pavement ◽  
Asphalt Mixture ◽  
Falling Weight Deflectometer ◽  
Relative Contribution ◽  
Transverse Profile ◽  
Falling Weight ◽  
Different Sources

The transverse profilograph has been recognized as one of the most accurate devices for the measurement of rut depth. However, interpretation of surface transverse profile measurements poses a major challenge in determining the contributions of the different layers to rutting. A literature review has shown that the actual rutting mechanism can be estimated from a surface transverse profile for determination of the relative contribution of the layers to rutting. Unfortunately, much of the research yielded no verification or data. In addition, some techniques presented cannot be used if the rut depth is not well pronounced. Other techniques may be costly and time-consuming. The present research developed an approach that integrates ( a) falling weight deflectometer and core data along with 3.6-m transverse profile measurements to assess the contributions of different pavement layers to rutting and ( b) identifies the presence (or absence) of instability within the asphalt surface layer. This approach can be used regardless of the magnitude of the rut depth. On the basis of the analysis conducted, absolute rut depth should not be used to interpret the performance of the asphalt mixture. In addition, continued instability may not result in an increase in rut depth because the rutted basin broadens as traffic wander compacts or moves the dilated portion of the mixture. The approach developed appears to provide a reasonable way to distinguish between different sources of rutting. The conclusions drawn from analysis of the approach agreed well with observations from the trench cuts taken from four sections.

scholarly journals Perbandingan Analisa Perkerasan Metode Bina Marga Revisi Juni 2017 dan AASHTO 1993 (Studi Kasus pada Pekerjaan Rencana Preservasi Ruas Jalan Jatibarang-Langut TA 2017) (Hal. 60-71)

2018 ◽  
Vol 4 (3) ◽  
pp. 60
Author(s):  
Sony Sumarsono ◽  
Heru Judi H. Gultom
Keyword(s):  
Secondary Data ◽  
Primary Data ◽  
Falling Weight Deflectometer ◽  
Calculation Results ◽  
The One ◽  
Capacity Data ◽  
National Road ◽  
Aashto 1993 ◽  
Falling Weight ◽  
Pavement Thickness

ABSTRAKJalan raya merupakan salah satu prasarana transportasi di Indonesia yang sering digunakan untuk menunjang kegiatan perekonomian khususnya pada jalan nasional. Namun, seringkali di jalan nasional terdapat kerusakan-kerusakan pada perkerasan jalan yang membuat kenyamanan pengendara terganggu. Salah satu ruas jalan nasional tersebut adalah jalan Jatibarang-Langut yang berada di jalur Pantura Jawa Barat. Pengujian yang dilakukan untuk mengetahui penyebab kerusakan perkerasan jalan tersebut yaitu survei traffic counting dan pengujian lendutan dengan alat Falling Weight Deflectometer (FWD) yang dalam perencanaan perhitungan tebal perkerasan akan dibandingkan menggunakan metode Bina Marga Revisi Juni 2017 dan AASHTO 1993. Data sekunder yang diperlukan adalah data daya dukung tanah dasar. Data primer yang diperoleh yaitu volume lalu lintas dan pengujian lendutan. Hasil perhitungan modulus tanah dasar 34,34 MPa dan modulus perkerasan 1.806,80 MPa. Sedangkan hasil perhitungan tebal perkerasan dengan CESA metode Bina Marga Revisi Juni 2017 47,42 cm dan CESA AASHTO 1993 38,74 cm.Kata kunci: Jatibarang-Langut, survei traffic counting, Falling Weight Deflectometer (FWD), Bina Marga Revisi Juni 2017, AASHTO 1993. ABSTRACTThe highway is one of the transportastion infrastructure in Indonesia which is often used to support economy activities especially on national road. However, often on the national road there are damages on pavement that makes disturbed rider’s comfort. The one of the national road segment is road Jatibarang-Langut located on the path Pantura, west Java. The testing done determine the cause of the pavement damege is survey traffic counting and deflection testing with Falling Weight Deflectometer (FWD) in planning pavement thickness calculation will be compared by using Bina Marga method Revision June 2017 and AASHTO 1993. The secondary data required is ground carrying capacity data. The primary data required os traffic volume and deflection testing. The calculation results of the basic soil modulus 34,34 MPa and pavement modulus 1.806,80 MPa. While the results of pavement thickness calculation by CESA method Bina Marga Revision June 2017 47,42 cm dand CESA AASHTO 1993 38,74 cm.Keywords: Jatibarang-Langut, survey traffic counting, Falling Weight Deflectometer (FWD), Bina Marga Revision June 2017, AASHTO 1993.

Visco-Elastic Back-Calculation of Traffic Speed Deflectometer Measurements

2019 ◽  
Vol 2673 (12) ◽  
pp. 439-448 ◽  
Author(s):  
Christoffer P. Nielsen
Keyword(s):  
Calculation Procedure ◽  
Falling Weight Deflectometer ◽  
Calculation Algorithm ◽  
Structural Evaluation ◽  
Driving Speed ◽  
Back Calculation ◽  
Traffic Speed ◽  
Falling Weight ◽  
Calculation Procedures ◽  
Project Level

The traffic speed deflectometer (TSD) has proven a valuable tool for network level structural evaluation. At the project level, however, the use of TSD data is still quite limited. An obstacle to the use of TSD at the project level is that the standard approaches to back-calculation of pavement properties are based on the falling weight deflectometer (FWD). The FWD experiment is similar, but not equivalent, to the TSD experiment, and therefore it is not straightforward to apply the traditional FWD back-calculation procedures to TSD data. In this paper, a TSD-specific back-calculation procedure is presented. The procedure is based on a layered linear visco-elastic pavement model and takes the driving speed of the vehicle into account. This is in contrast to most existing back-calculation procedures, which treat the problem as static and the pavement as purely elastic. The developed back-calculation procedure is tested on both simulated and real TSD data. The real TSD measurements exhibit significant effects of damping and visco-elasticity. The back-calculation algorithm is able to capture these effects and yields model fits in excellent agreement with the measured values.

A practical approach to falling-weight deflectometer (FWD) data reduction

2005 ◽  
Vol 42 (2) ◽  
pp. 641-645 ◽  
Author(s):  
Dieter Stolle ◽  
Peijun Guo
Keyword(s):  
Mechanical Properties ◽  
Shear Modulus ◽  
Falling Weight Deflectometer ◽  
Layer System ◽  
Surface Loading ◽  
Back Calculation ◽  
Pavement Response ◽  
Subgrade Modulus ◽  
Falling Weight

The authors present a simplified methodology for preprocessing falling-weight deflectometer (FWD) data, which identify a pseudo-static pavement response to surface loading. This allows one to employ static analysis to back-calculate the mechanical properties of the pavement–subgrade system. It is shown that the subgrade modulus can be identified, independent of the details of the pavement structure itself, at least for a two-layer system. The quality of the effective shear modulus is sensitive to the value of Poisson's ratio selected.Key words: pavement–subgrade system, subgrade modulus, back-calculation, FWD.

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