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原文传递 Refining the Simple Performance Tester for Use in Routine Practice.

题名：	Refining the Simple Performance Tester for Use in Routine Practice.
作者：	bonaquist, r.
关键词：	test equipment, compression tests, product development, loads (forces), data collection, performance test systems, recommendations, performance tests, automated equipment, specifications
摘要：	In Phases I and II of NCHRP Project 9-29, a detailed purchase specification for the Simple Performance Test System (SPT) was developed and two first article devices were procured and evaluated. This evaluation concluded that the SPT is a reasonably priced, user-friendly device for testing stiffness and permanent deformation properties of asphalt concrete. Additional work, however, was needed to further refine the SPT for use in routine practice. This additional work was undertaken in Phases IV and V of NCHRP Project 9-29. These phases of the project included four major activities directed at implementation of the SPT in routine practice: 1. Enhancement of the SPT to perform dynamic modulus master curve testing required for pavement structural design and analysis. 2. Procurement and evaluation of SPTs with dynamic modulus master curve testing capability. 3. Development of equipment for rapid preparation of test specimens for the SPT. 4. Ruggedness testing for the dynamic modulus and flow number tests conducted in the SPT. The ruggedness experiments were performed in Phase V of the project. This report documents the work completed in Phase IV. During Phase IV, a methodology was developed to construct dynamic modulus master curves for pavement structural design using an abbreviated testing protocol. With this protocol, it is not necessary to perform dynamic modulus testing at the lowest temperature included in AASHTO TP62. Eliminating the low temperature testing offers three advantages. First, the cost of environment control capabilities is substantially less. Second, smaller, less expensive actuators can be used since the load required for dynamic modulus testing depends on the stiffness of the material that increases with decreasing temperature. Third, testing below 32DGF is difficult and more variable due to potential icing of the instrumentation. Using the abbreviated protocol and the SPT, it is possible for highway agencies to routinely collect dynamic modulus data for the Mechanistic-Empirical Pavement Design Guide (MEPDG) and other applications. / Supplementary Notes: Prepared in cooperation with Advanced Aspphalt Technologies, LLC., Sterling, VA. Sponsored by American Association of State Highway and Transportation Officials, Washington, DC. and Federal Highway Administration, Washington, DC. / Availability Note: Product reproduced from digital image. Order this product from NTIS by: phone at 1-800-553-NTIS (U.S. customers); (703)605-6000 (other countries); fax at (703)605-6900; and email at orders@ntis.gov. NTIS is located at 5285 Port Royal Road, Springfield, VA, 22161, USA.
总页数：	u0823；153p
报告类型：	科技报告