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CPTP Status Report - Task 65 Engineering ETG Review CopyAppendix B - CPTP Project DetailsTask 59 (00) - Nondestructive and Innovative Testing WorkshopContracting Dates: September 2000 to March 2003 Project Goals/Objectives: The goals of this project are to 1) increase awareness of nondestructive testing technologies to federal, state, and local highway agencies, and 2) promote the use of high-speed testing techniques for performance-related specifications, warranties, QA/QC specifications, and high-performance concrete. Background: In the last several years, new and innovative testing techniques have evolved that have the potential for greatly improving the accuracy, reliability, and speed of assessing the quality or properties of in-place concrete. These techniques can play a significant role in the next generation of specifications, and it is important that highway agencies become familiar with the new technologies. One way of accomplishing this is through the presentation of hands-on workshops to interested highway agencies nationwide. Status: Draft training course materials were developed and presented in two pilot workshops: one in Maryland on April 9-11, 2002 and one in Ontario on October 17, 2002. Overall, the pilot workshops were well received and final modifications were made to the course materials, making it a two-day workshop. A new contract for the presentation of the workshop is anticipated to be advertised in early 2004, with a contract award shortly thereafter. Available Reports/Articles/Presentations: FHWA RFP Objectives, Scope of Work and Proposed Work Plan; Contractor's Work Plan Task 60 (99) - Curing of Portland Cement Concrete PavementsContracting Dates: 1999 to 2003 Project Goals/Objectives: To develop guidelines for selecting curing materials and procedures that will ensure adequate curing of pavement concrete, given the variation in concrete mixture proportions and climatic conditions at the time of paving. Background: Proper curing of concrete has a major influence on the performance of that concrete in service. Because of the relatively large surface area to volume ratio for pavements, this statement is particularly true for concrete pavements. Curing as used in this project includes both moisture control and temperature control of the concrete. Guidance is needed for materials and procedures selection in order to ensure proper curing for pavements in a range of situations. Status: The first drafts of the deliverables were reviewed, and indicated that a major shift in the researcher's approach was needed. The researchers prepared a second draft of the final report which was much better, but still needed additional streamlining and shift of emphasis. The contractor is now working on the final version of the report to address the latest set of review comments. The final report will include a guide on curing. Available Reports/Articles/Presentations: Poole, T. S. 2001. "Methods for Measuring Application Rate of Liquid Membrane-Forming Curing Compounds on Concrete Pavements." Proceedings, Seventh International Conference on Concrete Pavements, Orlando, FL. Other Related Reports/Articles/Presentations/Studies: FHWA RFP Objectives, Scope of Work and Proposed Work Plan; Contractor's Work Plan Task 61 (99) - Evaluation of Initial PCC Performance-Related Specification SystemsContracting Dates: 1999 to 2004 Project Goals/Objectives: To begin the implementation of performance-related specifications (PRS) by having State highway agencies develop, put into use, and evaluate a PRS system tailored to their needs. Background: Over the past 25 years, there has been a growing interest in the development of PRS for highway pavement construction. PRS systems are similar to quality assurance specifications; however the measured acceptance quality characteristics (e.g. concrete strength, slab thickness, initial smoothness) are directly related to pavement performance through mathematical relationships. Performance is defined by key distress types and is directly related to the future maintenance and rehabilitation costs and user costs of the highway. This link between acceptance quality characteristics and future life-cycle costs provides the ability to develop rational and fair contractor pay adjustments that depend on the as-constructed quality delivered for the project. Several FHWA research projects on development of PRS have now been completed, and guidance for implementing PRS is now available in the form of: (1) a prototype PRS; (2) a 19-step procedure for developing PRS; and (3) PaveSpec software. Status: Work in progress. INDOT is currently planning to develop and use PRS on a 3rd project. Available Reports/Articles/Presentations: FHWA RFP Objectives, Scope of Work and Proposed Work Plan; State DOT Work Plans Other Related Reports/Articles/Presentations/Studies: Gharaibeh, N.G., P.A. Kopac, and M.I. Darter, 2001, Effect of Variability and Central Tendency in Performance-Related Specifications for Concrete Pavements, Proceedings, Seventh International Conference on Concrete Pavements, International Society for Concrete Pavements, College Station, TX. Task 62 (01) - Achieving High Level of Smoothness Without Sacrificing Pavement PerformanceContracting Dates: July 2001 to July 2004 Project Goals/Objectives: The objectives of this project are to:
Background: There has been a continuing trend among highway agencies to specify smoother and smoother pavements. The requirements are steadily being raised in response to the user's increased expectations and the paving contractor's increased proficiency. However, while contractors are finding ways to attain the specified smoothness, it is not clear that the result is always an overall improvement in pavement performance. Like all materials and construction quality characteristics, smoothness should be considered as having an optimal level. Obviously it is undesirable to have a newly constructed pavement that is too rough. Alternately, very smooth pavements, if they fail prematurely, are also undesirable. This project investigates the potential for adverse effects on concrete properties and the performance of concrete pavements from trying to achieve some currently specified levels of smoothness. Status: Work in progress. The literature review has been completed and the initial meeting of the technical panel was held. The proposed work plan has been approved and the collection and analysis of data is underway. A request for a contract extension is anticipated. Available Reports/Articles/Presentations: FHWA RFP Objectives, Scope of Work and Proposed Work Plan; Contractor's Work Plan Task 63 (02) - Inertial Profile Data for PCC Pavement Performance EvaluationContracting Dates: August 2002 to February 2005 Project Goals/Objectives: The goal of this project is to determine if the magnitude of JPCP slab curvature can be related to pavement performance. This will be accomplished by:
Background: It has been known for some time that the changes in shape of PCC slabs due to construction conditions (built-in curvature) and environment (temperature curling and moisture warping) in a jointed pavement system have an influence on pavement performance. Exactly how performance is impacted by slab shape and the magnitude of changes to slab shape throughout its life cycle, has not been adequately documented. Many previous attempts to quantify the impact of slab shape on performance or determine the shape of PCC slabs on in-service pavements have been limited by insufficient sample size resulting from use of manual methods for determining slab shape. Recent advances in inertial profiling technology developed at FHWA's Turner-Fairbank Highway Research Center and advances in computer technology make is possible to measure reliably the shape of very large numbers of PCC pavement slabs over a short period of time and perform analysis of this data. These measurements can be repeated to develop a time-history of pavement slab shape. This technology was recently demonstrated by a high-speed inertial profiler that performed a detailed profile survey of four lanes of a 24 km Interstate pavement four times within a 24-hour period. Results from the testing showed that the magnitude of curvature of the slabs surveyed varied from positive 15 mm to negative 15mm using best-fit curve and simulated straightedge. The daily change in slab curvature was frequently measured at 5-7mm over a 22C pavement temperature range. It is hypothesized that slab shape changes in response to construction conditions, and diurnal temperature gradients may have a significant role in pavement performance. With the evolution from empirical pavement design to mechanistic pavement design, determination of changes to the shape of slabs in jointed PCC pavement and the distribution of slab curvature on in-service pavements is very critical. Status: Data collection started in April 2003. The contract was modified in September 2003 to add concurrent Close Proximity (CPX) noise measurement to short interval profile data to determine the relationship between mega texture (50-100 mm wavelength roughness) and tire-pavement noise for PCC pavement. Available Reports/Articles/Presentations: FHWA RFP Objectives, Scope of Work and Proposed Work Plan; Contractor's Work Plan Other Related Reports/Articles/Presentations/Studies: Fourth Annual Pavement/Materials and Testing Workshop, Pavement Smoothness, Friction, Tire/Pavement Noise, and Texturing, FHWA Office of Pavement Technology and Office of Infrastructure Research and Development, Arlington, VA, December 9-11, 2003. (multiple papers on the smoothness issue including curl/warp and faulting effect on ride. Task 64 (02) - Computer-Based Guidelines for Job-Specific Optimization of Paving ConcreteContracting Dates: 2002 to 2005 Project Goals/Objectives: To develop computer-based guidelines for optimizing materials selection and mixture proportioning for job-specific paving concrete. Background: Over the last several years the FHWA, IPRF, NCHRP and others have conducted a number of studies that dealt with various aspects of the effect of concrete components on the performance of the resulting concrete (using those materials) in concrete pavements. The wealth of information now available is too great to be practically assimilated and combined from existing guidelines, reports, tables and predictive models in order for a pavement or materials engineer to derive the optimal mix for a given paving project. Therefore, a coordinated effort is needed to take the results of previous work and integrate them into a computer-based system that will guide the concrete materials engineer in selecting the optimal mix for a particular project. Factors that need to be considered include pavement structural design (loading effects), early-age and long-term environmental effects, the construction process, desired service life, available local materials and cost. Status: Contract was awarded on August 30, 2002. A technical panel consisting of several state DOT concrete engineers, contractors, and various trade associations, was formed. The first meeting took place in November 2002. At that meeting, the panel provided direction and feedback to the contractor on their proposed approach. An interim report discussing the technical scope, information gaps, options for software development, a framework for the guidelines, and a detailed work plan for the remainder of the project was submitted in June 2003. A second panel meeting was held in late June 2003. The contractor is modifying the interim report based on comments received during and after that meeting. After the report is completed and approved, detailed development of the guidelines will begin. Available Reports/Articles/Presentations: FHWA RFP Objectives, Scope of Work and Proposed Work Plan; Contractor's Work Plan Other Reports/Articles/Presentations: Concrete Paving Notes Materials No. 1 - Formation and Characteristics of Portland Cement Concrete for Pavements: The Basis by Dale Harrington, Kejin Wang, Todd Hanson, and Jim Grove, Iowa State University, November 2002. Task 65 (03) - Technology Transfer, Deployment and Delivery for the Concrete Pavement Technology Program (CPTP)Contracting Dates: September 2003 to September 2005 (plus three optional years) Project Goals/Objectives: This contract will provide the engineering and communication services needed for the technology transfer, deployment and delivery of products resulting from the Concrete Pavement Technology Program (CPTP). The scope of the work to be performed under this contract will be defined both by the products that result from the CPTP and by the communication and outreach strategy that is proposed by the contractor and accepted by the FHWA. The technology transfer program is for the benefit of FHWA's customers and partners and it will be planned and executed in a timely and cost-effective manner. Task 65 will support FHWA's efforts to clearly demonstrate the value of the products resulting from the CPTP and to deliver benefits to a variety of end-user groups in the highway community including the States, industry, and academia. Status: The contract was awarded during September 2001. A CPTP Status Report (this report) has been prepared. In addition, a CPTP information flyer and a website (www.CPTPNOW.com) have been developed. A CPTP newsletter is under development. Meeting of Task 65 Executive ETG and Engineering ETG are planned for early 2004. Available Reports/Articles/Presentations: FHWA RFP Objectives, Scope of Work and Proposed Work Plan; Contractor's Work Plan
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This page last modified on 06/01/06 |
