2013 Session: 675

• Evaluating the Performance of Doweled and Isolation Joints at National Airport Pavement Testing Facility
  Abstract: The objective of this paper is to compare the stress based load transfer efficiency, LTE(S), of transverse doweled joints and transverse isolated transition joints (reinforced and thickened edge) for six different types of pavement structures. The six pavement structures include three PCC layers with modulus of ruptures (MOR) of 500 psi (low), 750 psi (medium), and 1000 psi (high). Each of these PCC layers are constructed over two different stabilized bases, asphalt and concrete (Econocrete). LTE(S) was calculated based on strains recorded under a moving wheel load at the National Airport Pavement Testing Facility (NAPTF). Both dowel joints and isolation transition joints had lower LTE(S) values on the Econocrete base. Overall, doweled joints deteriorated throughout testing, with LTE(S) reducing as trafficking progressed. Transition joints, which are designed to allow no load transfer, exhibited higher variability throughout testing and the LTE(S) for transition joints remained, on average, lower than the LTE(S) of doweled joints. In addition, dual gage and single gage analysis methods are compared against each other for the same passes. Single gage analysis compared well with dual gage analysis, having results that were within 6% of dual gage results. Both dowel joints and isolation transition joints were analyzed using dual gage analysis methods, but only dowel joints were also analyzed using single gage analysis.
  Authors: Blotta, Felipe; Mehta, Yusuf A.; Cleary, Douglas; Cunliffe, Charles; Joshi, Akshay
  Authors: Blotta, Felipe; Mehta, Yusuf A.; Cleary, Douglas; Cunliffe, Charles; Joshi, Akshay
  Year: 2013
  Document Type: Paper
  Subject: Aviation; Energy; Environment
  Session: 675
  Paper Number: 13-0569
• Impact of Cracking on Load Transfer Efficiency of Rigid Airfield Pavements
  Abstract: The mechanistic evaluation of pavement utilizing full scale test data is an important component to the study of pavement behavior. This study focuses on the use of concrete strain gages (CSG) and crack location data to evaluate the effect of localized cracking on the stress-based load transfer efficiency (LTE (S)) of transverse doweled pavement joints. Concrete strain gage data generated from the full scale testing carried out by the Federal Aviation Administration (FAA) at the National Airport Pavement Test Facility (NAPTF) has been analyzed in this study. Load Transfer Efficiency was determined from paired concrete strain gages for the test vehicle moving in opposite directions at two specific locations, resulting in four distinct cases of LTE (S). It was found that LTE (S) varies as loading progresses on the test sections, especially after cracking near the joint has occurred on the slabs. Additionally, peak strains from gages located at the joint can be used to evaluate the behavior of LTE (S) during the formation of cracks on the slab, in particular the case where the cracks have formed close to the doweled joint but are not yet visible on the surface.
  Authors: Cunliffe, Charles; Mehta, Yusuf A.; Cleary, Douglas; Joshi, Akshay
  Authors: Cunliffe, Charles; Mehta, Yusuf A.; Cleary, Douglas; Joshi, Akshay
  Year: 2013
  Document Type: Paper
  Subject: Aviation; Energy; Environment
  Session: 675
  Paper Number: 13-1353
• Airport Pavement Missing Data Management and Imputation Using Stochastic Multiple Imputation Model
  Abstract: In practice, missing data in pavement condition databases has been one of the most prevalent problems in airport pavement management systems. Missing data present problems in pavement performance analysis and uncertainties in pavement management decision making. A number of data imputation approaches are available for handling missing data. This paper examines the limitations of the conventional data imputation methods, and proposed a Stochastic Multiple Imputation approach to overcome the major imitations of the conventional methods. A case study is presented to appraise the effectiveness of the proposed approach against three conventional data imputation methods, namely the substitution by mean method, the substitution by interpolation method, and the substitution by regression method. The roughness and friction data of a 4-km long runway pavement, and roughness data of a 4-km long taxiway were considered. The effectiveness of auxiliary variables in data imputation models is also demonstrated. The proposed stochastic Multiple Imputation method yielded the smallest errors for the roughness as well as friction data. The mean substitution method resulted in imputed values with the highest amount of deviations from the observed values, followed by the regression substitution method and the interpolation method. The analysis showed that the proposed Stochastic Multiple Imputation method out-performed the conventional methods in handling missing pavement condition data for pavement management decision making.
  Authors: Farhan, Javed; Fwa, Tien Fang
  Authors: Farhan, Javed; Fwa, Tien Fang
  Year: 2013
  Document Type: Paper
  Subject: Aviation; Energy; Environment
  Session: 675
  Paper Number: 13-1301
  Practice-Ready: Yes
• Evaluating the Performance of Doweled and Isolation Joints at National Airport Pavement Testing Facility
  Authors: Mehta, Yusuf
  Authors: Mehta, Yusuf
  Year: 2013
  Document Type: Presentation
  Subject: Aviation; Energy; Environment
  Session: 675
  Paper Number: 13-0569
• Impact of Cracking on Load Transfer Efficiency of Rigid Airfield Pavements
  Authors: Cunliffe, Charles
  Authors: Cunliffe, Charles
  Year: 2013
  Document Type: Presentation
  Subject: Aviation; Energy; Environment
  Session: 675
  Paper Number: 13-1353
• Airport Pavement Missing Data Management and Imputation Using Stochastic Multiple Imputation Model
  Authors: Fwa, Tien Fang
  Authors: Fwa, Tien Fang
  Year: 2013
  Document Type: Presentation
  Subject: Aviation; Energy; Environment
  Session: 675
  Paper Number: 13-1301
• Impact of Cracking on Load Transfer Efficiency of Rigid Airfield Pavements
  Authors: Mehta, Yusuf
  Authors: Mehta, Yusuf
  Year: 2013
  Document Type: Presentation
  Subject: Aviation; Energy; Environment
  Session: 675
  Paper Number: 13-1353
• Energy Savings and the Airfield Electrical System: Designing from Operations and Maintenance Perspective
  Authors: Joyner, John
  Authors: Joyner, John
  Year: 2013
  Document Type: Presentation
  Subject: Aviation; Energy; Environment
  Session: 675
  Paper Number: P13-6399