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1、PAVEMENT PERFORMANCE DATA ANALYSIS FORUMSponsored by the TRB Data Analysis Working Group Alex T. Visser, Chairman A. Robert Raab, TRB Senior Program OfficerJanuary 10, 2009 Blue Room, Omni Shoreham Hotel, Washington, D.C.0900Call to Order 0900-0930Chairmans Welcome Staff Report 0930-1000FORECASTING
2、STRUCTURAL DETERIORATION Amy Simpson, Jonathan L. Groeger, and Bing Xu MACTEC Engineering and Consulting, Inc., Beltsville, Maryland 1000-1015Presenters Questions and General Discussion 1015-1030Morning Break 1030-1100USEFULNESS OF NATIONAL AIRPORT PAVEMENT TEST FACILITY (NAPTF) DATABASE FOR UNDERST
3、ANDING RIGID PAVEMENT BEHAVIOR AND JOINT RELATED DISTRESSES. Ashish Wadkar, Patrick Hoffman, Stephen Schwandt, Douglas Cleary, and Yusuf Mehta Rowan University, Department of Civil 2.Measurements of load induced strength of a PCC pavement. 3.Measured “fatigue” behavior of a PCC pavement and its poss
4、ible impact on failure model used for designPRESENTERS QUESTIONS: 1.What is definition of “pavement strength”? Does the critical stress calculated and used in any design specifications satisfy the definition of “pavement strength”?2.What is the definition of “load induced stress” and “total stress”
5、in a PCC pavement? Is there any difference between the two in contribution of cracking a PCC pavement? Can we conditionally use one to replace the other? What would be the conditions?3.Has the measurement technique been available to measure the total stress, or the total stress related strain in a P
6、CC pavement?4.How to take advantage of the “total stress” information for pavement research when it is available?PRESENTERS STATEMENT This is not a description of work from a single project. Rather, this presentation summarizes several ongoing projects having been done at the FAAs National Airport P
7、avement Test Facility in previous years. They are still in progress for verifications and applications. The major objective is to answer a question: What the critical stress is when a crack is initiated in a concrete pavement? None of existing mechanistic models can prove the reliability of their re
8、sults. Therefore, we rely on full scale measurements and the combination of mechanistic analysis and the measurements. We were bothered by some pending problems, including fuzzy understanding on some fundamental concepts in our research. Therefore, the author intends to take advantage of DAWG to hea
9、r comments from other participants on some of our existing results and advice for our future research. Stage results on residual stress measurements in beams have been published in July and August, 2008 in two international conferences. The test for single slab was completed three months ago but res
10、ults have never published. The test for multiple slab tests will be done in the near future. No paper has been published by us on the pavement mechanism due to strength failure and “fatigue” failure. STUDYING THE IMPACT OF DESIGN FEATURES ON PAVEMENT RESPONSE AND PERFORMANCE IN REHABILITATED FLEXIBL
11、E PAVEMENTSManuel Ayres, Hamid Shirazi, Olga Selezneva, and Regis Carvalho Applied Research Associates Inc. 7184 Troy Hill Drive, Suite N Elkridge, Maryland 21075 Tel.: 410-540-9949; Fax: 410-540-9288; E-mail: ABSTRACT:The performance of a rehabilitated pavement section depends on the site conditio
12、ns (climate, foundation and traffic), design (structure and rehabilitation measures), and construction features. This research effort focuses on the need to determine how design and construction features impact pavement response and performance, and identify their importance on the prediction of fut
13、ure pavement performance. LTPP SPS-5 and SPS-6 data provide the necessary information to evaluate the effects of design and construction features on response and performance of rehabilitated pavement structures. This presentation will focus on the Phase I results that included assessment of availabl
14、e data and development of data analysis methodologies to address the study objectives. Statistical methods to evaluate the data and an approach to normalize traffic conditions will be presented. Once completed, this research will provide information on the relationship between pavement response and
15、performance, guidance for identifying appropriate features and rehabilitation techniques for different pavement types and environmental conditions, as well as recommendations for improving data collection activities. The early analyses results obtained in Phase I of this study will help to determine
16、 the causes of distress, and to formulate models predicting performance of rehabilitated pavements. Preventive maintenance is also an important characteristic of an effective pavement rehabilitation program. Data from preventive pavement maintenance LTPP SPS-3 and SPS-4 experiments have been evaluated to determine the effectiveness of these types of alternative and their relationship with pavement performance. Preliminary findings
