AASHTO PP 72-2011 Standard Practice for Recovering Residue from Emulsified Asphalt Using Low-Temperature Evaporative Techniques.pdf
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1、Standard Practice for Recovering Residue from Emulsified Asphalt Using Low-Temperature Evaporative Techniques AASHTO Designation: PP 72-11 (2013)1American Association of State Highway and Transportation Officials 444 North Capitol Street N.W., Suite 249 Washington, D.C. 20001 TS-2a PP 72-1 AASHTO St
2、andard Practice for Recovering Residue from Emulsified Asphalt Using Low-Temperature Evaporative Techniques AASHTO Designation: PP 72-11 (2013)11. SCOPE 1.1. This practice covers two methods for recovering the residue from emulsified asphalts such as those specified in M 140 and M 208, using low-tem
3、perature evaporative techniques that are similar to pavement conditions. The recovered residue can be used for further testing as required. 1.2. The values stated in SI units are to be regarded as the standard. 1.3. This standard may involve hazardous materials, operations, and equipment. This stand
4、ard does not purport to address all of the safety concerns associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. 2. REFERENCED DOCUMENTS 2.1. AASHTO S
5、tandards: M 140, Emulsified Asphalt M 208, Cationic Emulsified Asphalt T 59, Emulsified Asphalts 2.2. ASTM Standard: E 145, Standard Specification for Gravity-Convection and Forced-Ventilation Ovens 2.3. French Standard Institute: NF EN 13074, Recovery of Binder from Bitumen Emulsions by Evaporation
6、 Note 1The EN 13074 Standard is published and distributed through AFNOR (French Standard Institute) and is available online at www.afnor.fr. 3. SIGNIFICANCE AND USE 3.1. Use the procedures described in this practice to obtain a residue from emulsified asphalt for further testing in devices such as a
7、 dynamic shear rheometer. The lower evaporative temperatures of these procedures provide conditions that are very close to that of application techniques for these materials. Use this practice in place of recovery techniques such as those in T 59; the temperatures used in that standard may negativel
8、y affect the residue. 2014 by the American Association of State Highway and Transportation Officials.All rights reserved. Duplication is a violation of applicable law.TS-2a PP 72-2 AASHTO 4. APPARATUS 4.1. Silicone MatThe mat used can be similar to that specified in NF EN 13074 or any mat that will
9、allow an emulsified asphalt spread rate of 1.5 to 2.0 kg/m2(0.31 to 0.41 lb/ft2) for Procedure A or a 0.381-mm (0.015-in.) wet film thickness for Procedure B. The mat may have a lip to contain the emulsified asphalt in the appropriate area. Note 2A silicone mat can be purchased at restaurant supply
10、stores. The size of the mat should be larger than the wet film applicator or other suitable sample-spreading tool. The mat size should be sufficient to produce a sample of the desired volume for subsequent testing. A good size for this application is a half-sheet pan size, which will fit in most lab
11、oratory ovens. 4.2. Flat Oven Tray A flat oven tray or other flat heat-resistant tray or pan to support the silicone mat and allow easy transfer to the oven. Note 3A metal cookie sheet, slightly larger than the silicone mat, works well. The tray and silicone mat must fit on a rack in the forced-draf
12、t oven. 4.3. Spatula A spatula or palette knife for spreading the emulsified asphalt. 4.4. RodsRounded-end glass or metal rods of sufficient diameter and length to roll up the residue sample. 4.5. Forced-Draft OvenHorizontal air flow, mechanical convection oven meeting the requirements of ASTM E 145
13、, Type IIA, at 25C (77F) and 60C (140F). Racks shall be spaced a minimum of 10 cm (4 in.) from the top and bottom of the oven and with a minimum spacing of 4 cm (1.6 in.) between racks with samples. Use a bubble level of 25-cm (10-in.) minimum length to ensure the racks are level from side to side a
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