Pub Date : 2021-12-20DOI: 10.1201/9781003078814-25
S. Neßlauer
{"title":"Reinforcement of Flexible Pavements – Design of Finite Element Models","authors":"S. Neßlauer","doi":"10.1201/9781003078814-25","DOIUrl":"https://doi.org/10.1201/9781003078814-25","url":null,"abstract":"","PeriodicalId":11581,"journal":{"name":"Eleventh International Conference on the Bearing Capacity of Roads, Railways and Airfields, Volume 1","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80765747","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-12-20DOI: 10.1201/9781003078814-28
W. Steyn, A. Visser
The purpose of this paper is to indicate the effect that moving dynamic tyre loads has on the tyre-pavement contact stresses used in pavement analysis. Traditionally tyre loads (in pavement analysis) are modelled as constant loads applied through circular uniform contact patches to a pavement surface. However, actual tyre loads are dynamic in nature and the contact stresses between the tyre and pavement are non-uniform and non-circular. Recent developments in the field of tyre-pavement contact stresses at CSIR Transportek permitted measurement of the 3-dimensional contact-stress patterns under slow-moving tyres. Research conducted on moving dynamic tyre loads indicated that the population for specific conditions could be modelled using a normal distribution. Combination of these data sets can be used to indicate the actual tyre-pavement contact stress distribution for traffic. This new distribution can be used to select more realistic tyre loading conditions for use in mechanistic analysis of pavement response to real traffic. Initial results of applying the distribution of moving dynamic tyre loads to a pavement analysis situation indicated that higher nominal tyre loads can be expected than traditionally used, mainly due to the dynamic nature of the tyre load distribution. Results from the tyre-pavement contact stress measurements indicated that different tyre contact-stress patterns develop when the tyre load changes and the tyre inflation pressure is a constant. Combination of these effects may shed light on pavement surface behaviour under real traffic loading. In this paper it was found that traditional assumptions regarding the constant nature of tyre loads and uniform, circular nature of tyre-pavement contact-stresses are not valid and that innovative use of available information can assist the pavement engineer to perform more realistic pavement analyses. Pavement response analyses using these new tyre loads are explicitly excluded, as it is covered in a companion paper by De Beer et al. (2002). For the covering abstract see ITRD E118503.
{"title":"Effects of Moving Dynamic Tyre Loads on Tyre-Pavement Contact Stresses","authors":"W. Steyn, A. Visser","doi":"10.1201/9781003078814-28","DOIUrl":"https://doi.org/10.1201/9781003078814-28","url":null,"abstract":"The purpose of this paper is to indicate the effect that moving dynamic tyre loads has on the tyre-pavement contact stresses used in pavement analysis. Traditionally tyre loads (in pavement analysis) are modelled as constant loads applied through circular uniform contact patches to a pavement surface. However, actual tyre loads are dynamic in nature and the contact stresses between the tyre and pavement are non-uniform and non-circular. Recent developments in the field of tyre-pavement contact stresses at CSIR Transportek permitted measurement of the 3-dimensional contact-stress patterns under slow-moving tyres. Research conducted on moving dynamic tyre loads indicated that the population for specific conditions could be modelled using a normal distribution. Combination of these data sets can be used to indicate the actual tyre-pavement contact stress distribution for traffic. This new distribution can be used to select more realistic tyre loading conditions for use in mechanistic analysis of pavement response to real traffic. Initial results of applying the distribution of moving dynamic tyre loads to a pavement analysis situation indicated that higher nominal tyre loads can be expected than traditionally used, mainly due to the dynamic nature of the tyre load distribution. Results from the tyre-pavement contact stress measurements indicated that different tyre contact-stress patterns develop when the tyre load changes and the tyre inflation pressure is a constant. Combination of these effects may shed light on pavement surface behaviour under real traffic loading. In this paper it was found that traditional assumptions regarding the constant nature of tyre loads and uniform, circular nature of tyre-pavement contact-stresses are not valid and that innovative use of available information can assist the pavement engineer to perform more realistic pavement analyses. Pavement response analyses using these new tyre loads are explicitly excluded, as it is covered in a companion paper by De Beer et al. (2002). For the covering abstract see ITRD E118503.","PeriodicalId":11581,"journal":{"name":"Eleventh International Conference on the Bearing Capacity of Roads, Railways and Airfields, Volume 1","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86280816","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-12-20DOI: 10.1201/9781003078814-60
Wågberg Lars-Göran
{"title":"Pavement Deterioration – Crack Initiation and Crack Propagation Models","authors":"Wågberg Lars-Göran","doi":"10.1201/9781003078814-60","DOIUrl":"https://doi.org/10.1201/9781003078814-60","url":null,"abstract":"","PeriodicalId":11581,"journal":{"name":"Eleventh International Conference on the Bearing Capacity of Roads, Railways and Airfields, Volume 1","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89664657","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-12-20DOI: 10.1201/9781003078814-64
Qiao Dong, Y. Hachiya, O. Takahashi, Y. Tsubokawa, K. Matsui
This paper describes a backcalculation algorithm to determine the layer moduli and damping coefficients in the time domain for large-scale pavement structures. Pavement is modeled by three-dimensional finite element (3D FE). The parameter identification procedure makes use of the Ritz vector method to reduce the size of matrices involved in the forward dynamic response analysis and the deflection sensitivity analysis. The responses of the reduced equation system are obtained in the time domain using the direct integration method. The parameter estimates are improved iteratively by means of an algorithm that calls the finite element program of transient response analysis as a subroutine combining singular value decomposition (SVD) method. The system constructed in this manner is applied to two experimentally tested sections of pavement, which are modeled by 3D FE, in order to verify its effectiveness. All parameters are determined using the surface deflection-time histories of pavement experimentally recorded from the falling weight deflectometer (FWD) tests at the sensor locations. For the covering abstract see ITRD E118503.
{"title":"Efficient Backcalculation Algorithm of Time Domain for Large-Scale Pavement Systems Using Ritz Vectors","authors":"Qiao Dong, Y. Hachiya, O. Takahashi, Y. Tsubokawa, K. Matsui","doi":"10.1201/9781003078814-64","DOIUrl":"https://doi.org/10.1201/9781003078814-64","url":null,"abstract":"This paper describes a backcalculation algorithm to determine the layer moduli and damping coefficients in the time domain for large-scale pavement structures. Pavement is modeled by three-dimensional finite element (3D FE). The parameter identification procedure makes use of the Ritz vector method to reduce the size of matrices involved in the forward dynamic response analysis and the deflection sensitivity analysis. The responses of the reduced equation system are obtained in the time domain using the direct integration method. The parameter estimates are improved iteratively by means of an algorithm that calls the finite element program of transient response analysis as a subroutine combining singular value decomposition (SVD) method. The system constructed in this manner is applied to two experimentally tested sections of pavement, which are modeled by 3D FE, in order to verify its effectiveness. All parameters are determined using the surface deflection-time histories of pavement experimentally recorded from the falling weight deflectometer (FWD) tests at the sensor locations. For the covering abstract see ITRD E118503.","PeriodicalId":11581,"journal":{"name":"Eleventh International Conference on the Bearing Capacity of Roads, Railways and Airfields, Volume 1","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79741854","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-12-20DOI: 10.1201/9781003078814-19
E. Fernando, Weibo Liu
The falling weight deflectometer (FWD) is widely used for nondestructive pavement evaluation. Most applications in current practice use the peak displacements from the geophones to backcalculate pavement layer moduli. Limited application has been made of dynamic analysis, which uses the load and displacement histories that are easily obtained from the FWD. This paper illustrates the application of dynamic analysis using a pavement model that characterizes a given material as viscoelastic or damped elastic. To illustrate the application of dynamic analysis, FWD data from a number of sites were analyzed to predict material properties and depths-to-bedrock. The predicted depths were found to be in fair agreement with the reported values from soil borings made at the sites. For the covering abstract see ITRD E118503.
{"title":"Dynamic Analysis of FWD Data for Pavement Evaluation","authors":"E. Fernando, Weibo Liu","doi":"10.1201/9781003078814-19","DOIUrl":"https://doi.org/10.1201/9781003078814-19","url":null,"abstract":"The falling weight deflectometer (FWD) is widely used for nondestructive pavement evaluation. Most applications in current practice use the peak displacements from the geophones to backcalculate pavement layer moduli. Limited application has been made of dynamic analysis, which uses the load and displacement histories that are easily obtained from the FWD. This paper illustrates the application of dynamic analysis using a pavement model that characterizes a given material as viscoelastic or damped elastic. To illustrate the application of dynamic analysis, FWD data from a number of sites were analyzed to predict material properties and depths-to-bedrock. The predicted depths were found to be in fair agreement with the reported values from soil borings made at the sites. For the covering abstract see ITRD E118503.","PeriodicalId":11581,"journal":{"name":"Eleventh International Conference on the Bearing Capacity of Roads, Railways and Airfields, Volume 1","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80204484","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-12-20DOI: 10.1201/9781003078814-73
J. Neves, A. Correia
A flexible pavement section from an important motorway in Lisbon was instrumented during the construction phase, in 1996 and 1997, with deformation gauges being placed at different levels; longitudinal and transversal horizontal gauges at the bottom of the bituminous layers, and vertical gauges on the top of the unbound granular materials and subgrade soil. The structure of this pavement is composed of: binder and base layers in bituminous concrete; sub-base in unbound granular materials; subgrade soil. The temperature of the bituminous layers was measured by thermoelectric couples. To study the bearing capacity of the structure, wheel load tests were carried out after the construction of each layer of the pavement. Falling Weight Deflectometer (FWD) tests were also carried out for different loads applied to the final pavement structure. During these load tests, strains and temperature measurements were made. The main conclusions obtained from load tests results indicate that the bearing capacity of the instrumented pavement differs according to the type of load applied (quasi-static or dynamic) and behaviour of pavement materials is non-linear. The influence of bituminous macadam temperature and binder course thickness was also analyzed. For the covering abstract see ITRD E118503.
{"title":"Bearing Capacity of a Flexible Pavement during the Construction Phase","authors":"J. Neves, A. Correia","doi":"10.1201/9781003078814-73","DOIUrl":"https://doi.org/10.1201/9781003078814-73","url":null,"abstract":"A flexible pavement section from an important motorway in Lisbon was instrumented during the construction phase, in 1996 and 1997, with deformation gauges being placed at different levels; longitudinal and transversal horizontal gauges at the bottom of the bituminous layers, and vertical gauges on the top of the unbound granular materials and subgrade soil. The structure of this pavement is composed of: binder and base layers in bituminous concrete; sub-base in unbound granular materials; subgrade soil. The temperature of the bituminous layers was measured by thermoelectric couples. To study the bearing capacity of the structure, wheel load tests were carried out after the construction of each layer of the pavement. Falling Weight Deflectometer (FWD) tests were also carried out for different loads applied to the final pavement structure. During these load tests, strains and temperature measurements were made. The main conclusions obtained from load tests results indicate that the bearing capacity of the instrumented pavement differs according to the type of load applied (quasi-static or dynamic) and behaviour of pavement materials is non-linear. The influence of bituminous macadam temperature and binder course thickness was also analyzed. For the covering abstract see ITRD E118503.","PeriodicalId":11581,"journal":{"name":"Eleventh International Conference on the Bearing Capacity of Roads, Railways and Airfields, Volume 1","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74486871","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-12-20DOI: 10.1201/9781003078814-82
H. Wu, S. Wang, I. Abdallah, S. Nazarian
Nondestructive testing (NDT) of pavements has made substantial progress during the last two decades. Most algorithms currently used to determine the remaining life of pavements rely on stiffness parameters determined from NDT devices. One major area of continual improvement is the reliable extraction of stiffness parameters from nondestructive field data. The Spectral analysis of Surface Waves (SASW) method is one of the NDT methods that is used more frequently because of its capabilities in characterizing the near-surface layers more effectively. In this method, time records obtained with vibration sensors are used to obtain an experimental dispersion curve, which provides, through an inversion procedure, an estimate of the elastic modulus profile of the pavement. The inversion process requires a significant computational effort or frequent operator's intervention. To improve the user-friendliness of the inversion process, a new algorithm for the rapid reduction of the SASW data has been developed. Thickness and modulus of each pavement layer are estimated in real time using artificial neural network models. The training and validation of models are done using an axisymmetrical full-waveform forward model to minimize the approximations associated with simpler models used in the inversion algorithms. This paper provides an overview of the proposed inversion and its practical use and limitations in pavement analysis and design. The reduction algorithm seems to be robust and to yield consistent results in almost real time. For the covering abstract see ITRD E118503.
{"title":"A Rapid Approach to Interpretation of SASW Results","authors":"H. Wu, S. Wang, I. Abdallah, S. Nazarian","doi":"10.1201/9781003078814-82","DOIUrl":"https://doi.org/10.1201/9781003078814-82","url":null,"abstract":"Nondestructive testing (NDT) of pavements has made substantial progress during the last two decades. Most algorithms currently used to determine the remaining life of pavements rely on stiffness parameters determined from NDT devices. One major area of continual improvement is the reliable extraction of stiffness parameters from nondestructive field data. The Spectral analysis of Surface Waves (SASW) method is one of the NDT methods that is used more frequently because of its capabilities in characterizing the near-surface layers more effectively. In this method, time records obtained with vibration sensors are used to obtain an experimental dispersion curve, which provides, through an inversion procedure, an estimate of the elastic modulus profile of the pavement. The inversion process requires a significant computational effort or frequent operator's intervention. To improve the user-friendliness of the inversion process, a new algorithm for the rapid reduction of the SASW data has been developed. Thickness and modulus of each pavement layer are estimated in real time using artificial neural network models. The training and validation of models are done using an axisymmetrical full-waveform forward model to minimize the approximations associated with simpler models used in the inversion algorithms. This paper provides an overview of the proposed inversion and its practical use and limitations in pavement analysis and design. The reduction algorithm seems to be robust and to yield consistent results in almost real time. For the covering abstract see ITRD E118503.","PeriodicalId":11581,"journal":{"name":"Eleventh International Conference on the Bearing Capacity of Roads, Railways and Airfields, Volume 1","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77421574","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-12-20DOI: 10.1201/9781003078814-62
A. Montepara, F. Giuliani
The code PA.R.M.A. (PAvement Reinforced Model Analysis), developed by the research group of Parma University, is a non-linear layered f.e.m. program for P.C., oriented to the analysis of reinforced concrete slabs resting upon an elastic-plastic foundation and subjected to monotonic loadings, capable of evaluating both the serviceability load and the ultimate load. In the program, flexible slabs exposed to the activity of local heavy loads, unilateral contact constitutes the dominating feature. Unilateral bonds may also become evident in the case of eccentrically loaded thick slabs or when plastic deformations appear in the elastic-plastic foundation due to variable loads. An orthotropic incrementally linear relationship and equivalent uniaxial concept are used to represent the behaviour of concrete under biaxial stresses while a uniaxial bilinear elasto-plastic model with hardening is employed for reinforcing bars. After cracking, the orthogonal fixed crack model is adopted and tension stiffening, reduction in compressive strength and stiffness after cracking, and strain softening in compression are accounted for. In this paper, is presented the implementation of the program with an original formulation of a crack element dedicated to the study of the effect in the plate due to the presence of crack in the top of it. The proposed finite element model has been tested by the comparisons with other analytical models available in literature, showing a good agreement. For the covering abstract see ITRD E118503.
{"title":"Crack Element in the Non-linear f.e.m. Program PA.R.M.A. for the Design of Reinforced Concrete Pavements","authors":"A. Montepara, F. Giuliani","doi":"10.1201/9781003078814-62","DOIUrl":"https://doi.org/10.1201/9781003078814-62","url":null,"abstract":"The code PA.R.M.A. (PAvement Reinforced Model Analysis), developed by the research group of Parma University, is a non-linear layered f.e.m. program for P.C., oriented to the analysis of reinforced concrete slabs resting upon an elastic-plastic foundation and subjected to monotonic loadings, capable of evaluating both the serviceability load and the ultimate load. In the program, flexible slabs exposed to the activity of local heavy loads, unilateral contact constitutes the dominating feature. Unilateral bonds may also become evident in the case of eccentrically loaded thick slabs or when plastic deformations appear in the elastic-plastic foundation due to variable loads. An orthotropic incrementally linear relationship and equivalent uniaxial concept are used to represent the behaviour of concrete under biaxial stresses while a uniaxial bilinear elasto-plastic model with hardening is employed for reinforcing bars. After cracking, the orthogonal fixed crack model is adopted and tension stiffening, reduction in compressive strength and stiffness after cracking, and strain softening in compression are accounted for. In this paper, is presented the implementation of the program with an original formulation of a crack element dedicated to the study of the effect in the plate due to the presence of crack in the top of it. The proposed finite element model has been tested by the comparisons with other analytical models available in literature, showing a good agreement. For the covering abstract see ITRD E118503.","PeriodicalId":11581,"journal":{"name":"Eleventh International Conference on the Bearing Capacity of Roads, Railways and Airfields, Volume 1","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80713450","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-12-20DOI: 10.1201/9781003078814-83
D. Yuan, S. Nazarian
To successfully implement any mechanistic pavement design procedure, and to move toward performance-based specifications, it is essential to develop tools that can measure the modulus of each layer in a pavement structure. The main objective of this paper is to summarize a new initiative for mechanistic-based quality control using seismic techniques. Field protocols and test equipment, which in a rational manner combine the results from laboratory and field tests with those used for quality control during construction, are discussed. The institutional and technical challenges are also detailed. Case studies are included to show how the protocol is implemented to harmonize the activities of the design group with those from the materials lab personnel and with the construction engineer. For the covering abstract see ITRD E118503.
{"title":"An Initiative Toward Mechanistic Construction Quality Control Using Seismic Methods","authors":"D. Yuan, S. Nazarian","doi":"10.1201/9781003078814-83","DOIUrl":"https://doi.org/10.1201/9781003078814-83","url":null,"abstract":"To successfully implement any mechanistic pavement design procedure, and to move toward performance-based specifications, it is essential to develop tools that can measure the modulus of each layer in a pavement structure. The main objective of this paper is to summarize a new initiative for mechanistic-based quality control using seismic techniques. Field protocols and test equipment, which in a rational manner combine the results from laboratory and field tests with those used for quality control during construction, are discussed. The institutional and technical challenges are also detailed. Case studies are included to show how the protocol is implemented to harmonize the activities of the design group with those from the materials lab personnel and with the construction engineer. For the covering abstract see ITRD E118503.","PeriodicalId":11581,"journal":{"name":"Eleventh International Conference on the Bearing Capacity of Roads, Railways and Airfields, Volume 1","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78868430","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-12-20DOI: 10.1201/9781003078814-71
W. Marsey, N. Garg
The need for an accepted worldwide standard configuration of falling weight deflectometer (FWD) testing equipment used for airport runway pavements is highlighted in this paper. The data provided by the FWD equipment can have a significant effect on airport pavement design and maintenance programs. The major FWD equipment configuration parameters affecting the measured deflection basins include the load levels, load plate size, and load pulse duration. This paper summarizes the results from FWD tests performed on flexible pavements to study the uniformity of pavement structures at the National Airport Pavement Test Facility (NAPTF). The data was analyzed to study pavement structure uniformity, relationship between the sensor responses and load, and relationship between sensor response and load pulse duration. For the covering abstract see ITRD E118503.
{"title":"Falling Weight Deflectometer Configuration Standards for Airfield Testing","authors":"W. Marsey, N. Garg","doi":"10.1201/9781003078814-71","DOIUrl":"https://doi.org/10.1201/9781003078814-71","url":null,"abstract":"The need for an accepted worldwide standard configuration of falling weight deflectometer (FWD) testing equipment used for airport runway pavements is highlighted in this paper. The data provided by the FWD equipment can have a significant effect on airport pavement design and maintenance programs. The major FWD equipment configuration parameters affecting the measured deflection basins include the load levels, load plate size, and load pulse duration. This paper summarizes the results from FWD tests performed on flexible pavements to study the uniformity of pavement structures at the National Airport Pavement Test Facility (NAPTF). The data was analyzed to study pavement structure uniformity, relationship between the sensor responses and load, and relationship between sensor response and load pulse duration. For the covering abstract see ITRD E118503.","PeriodicalId":11581,"journal":{"name":"Eleventh International Conference on the Bearing Capacity of Roads, Railways and Airfields, Volume 1","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89489207","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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