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原文传递 Improved Conditioning and Testing Procedures for HMA Moisture Susceptibility.

题名：	Improved Conditioning and Testing Procedures for HMA Moisture Susceptibility.
作者：	solaimanian, m. bonaquist, r. f. tandon, v.
关键词：	performance tests, moisture content, damage assessment, aggregates, binders
摘要：	Moisture damage continues to be one of the major causes of premature failure of hot-mix asphalt pavements. Moisture damage in HMA occurs due to a loss of adhesion and/or cohesion, resulting in reduced strength or stiffness of the HMA and the development of various forms of pavement distress. Numerous laboratory tests have been developed over the years to identify the moisture sensitivity of HMA. A general consensus in the industry is that laboratory tests performed on compacted HMA have the potential to be better indicators of moisture sensitivity than tests on loose mixture samples or the component asphalt binder or aggregate. Research documented by R. P. Lottman in NCHRP Report 192: Predicting Moisture-Induced Damage to Asphaltic Concrete(Transportation Research Board, National Research Council, Washington, D.C.,1978) with further modifications by D. G. Tunnicliff and R. Root (Antistripping Additives in Asphalt Concrete State-of-the-Art 1981, Proceedings, Association of Asphalt Paving Technologists, Volume 51, 1982, pp. 265293) resulted in the laboratory test that currently has the widest acceptance in the paving industry, AASHTO T283/ASTM D4867. Some state highway agencies have used alternatives such as the Hamburg Wheel Tracking Device and the Asphalt Pavement Analyzer. Under NCHRP Project 9-34, research was undertaken to develop an improved laboratory test procedure for predicting asphalt concrete susceptibility to moisture damage through integrating the Environmental Conditioning System and Superpave simple performance tests. The ECS was developed under the Strategic Highway Research Program (SHRP)for predicting the moisture sensitivity of asphalt concrete under conditions of temperature,moisture saturation, and dynamic loading similar to those found in pavements. Several modifications were made to the ECS based on Post-SHRP evaluations at the University of Texas at El Paso. Specific Superpave simple performance tests were researched and recommended under NCHRP Project 9-19. These tests included flow time (static creep), flow number (repeatedload permanent deformation), and dynamic modulus. The objective of NCHRP Project9-34 was to investigate whether an improved moisture sensitivity test could be developed by combining the ECS conditioning procedure with one of the NCHRP Project 9-19 simple performance tests. The scope of work for NCHRP Project 9-34 was divided into two Phases. Phase I focused onthe development and execution of a limited experiment to evaluate the potential for combining the NCHRP Project 9-19 simple performance tests with the ECS conditioning procedure to produce an improved moisture sensitivity test. Phase IA focused on further investigation of the ability of the selected simple performance test in combination with the ECS conditioning procedure to predict the moisture sensitivity of a larger number of mixes with documented field performance. / NOTE: Final rept. for 27 Sep 01-26 Dec 04. / Supplementary Notes: Prepared in cooperation with Texas Transportation Inst., College Station. Sponsored by John A. Volpe National Transportation Systems Center, Cambridge, MA. and Federal Highway Administration, McLean, VA. / Availability Note: 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：	u0808；79p
报告类型：	科技报告