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原文传递 Relationships of HMA (Hot Mix Asphalt) In-Place Air Voids, Lift Thickness, and Permeability. Volume Two.

题名：	Relationships of HMA (Hot Mix Asphalt) In-Place Air Voids, Lift Thickness, and Permeability. Volume Two.
作者：	brown, e. r. hainin, m. r. cooley, a. hurley, g.
关键词：	measurement, mix design, density
摘要：	A major concern of the hot mix asphalt (HMA) industry is the proper measurement of bulk specific gravity (Gmb) of compacted samples. This issue has become a bigger problem with the increased use of coarse gradations. Bulk specific gravity measurements are the basis for volumetric calculations used during HMA mix design, field control, and construction acceptance. During mix design, volumetric properties such as air voids, voids in mineral aggregates, voids filled with asphalt, and percent theoretical maximum density at a certain number of gyrations are used to evaluate the acceptability of mixes. All of these properties are based upon Gmb. In most states, acceptance of HMA construction by the owner is typically based upon percent compaction calculated as a percent of theoretical maximum density. Whether nondestructive (e.g., nuclear gauges) or destructive (e.g., cores) tests are used as the basis of acceptance, Gmb measurements are equally important. When nondestructive devices are utilized, each device has to first be calibrated to the Gmb of cores. If the Gmb measurements of the cores are inaccurate in this calibration step, then the nondestructive device will provide inaccurate data. Additionally, pay factors for construction, whether reductions or bonuses, are generally applied to percent compaction. Thus, errors in Gmb measurements can potentially affect both the agency and producer. / Supplementary Notes: See also Volume 1, PB2007-106728 and Volume 3, PB2007-106700. Prepared in cooperation with National Center for Asphalt Technology, Auburn, AL. 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：	u0711；83p
报告类型：	科技报告