1、Standard Method of Test for Accelerated Aging of Hot-Poured Asphalt Crack Sealant Using a Vacuum Oven AASHTO Designation: T 367-171Technical Section: 4e, Joints, Bearings, and Geosynthetics Release: Group 2 (June 2017) American Association of State Highway and Transportation Officials 444 North Capi
2、tol Street N.W., Suite 249 Washington, D.C. 20001 TS-4e T 367-1 AASHTO Standard Method of Test for Accelerated Aging of Hot-Poured Asphalt Crack Sealant Using a Vacuum Oven AASHTO Designation: T 367-171Technical Section: 4e, Joints, Bearings, and Geosynthetics Release: Group 2 (June 2017) 1. SCOPE 1
3、.1. This method applies to hot-poured asphalt crack sealant used in the construction and maintenance of roadways. 1.2. The method covers the accelerated aging of hot-poured asphalt crack sealant material by means of elevated temperatures and vacuum as specified in MP 25 and PP 85. 1.3. This standard
4、 does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish and follow appropriate health and safety practices and determine the applicability of regulatory limitations prior to use. 2. REFERENCED DOCUME
5、NTS 2.1. AASHTO Standards: R 28, Accelerated Aging of Asphalt Binder Using a Pressurized Aging Vessel (PAV) MP 25, Performance-Graded Hot-Poured Asphalt Crack Sealant PP 85, Grading or Verifying the Sealant Grade (SG) of a Hot-Poured Asphalt Crack Sealant T 368, Measuring Low-Temperature Flexural Cr
6、eep Stiffness of Hot-Poured Asphalt Crack Sealant by Bending Beam Rheometer (BBR) T 369, Evaluation of the Low-Temperature Tensile Property of Hot-Poured Asphalt Crack Sealant by Direct Tension Test T 370, Measuring Adhesion of Hot-Poured Asphalt Crack Sealant Using Direct Adhesion Tester 2.2. ASTM
7、Standards: D5167, Standard Practice for Melting of Hot-Applied Joint and Crack Sealant and Filler for Evaluation E77, Standard Test Method for Inspection and Verification of Thermometers E145, Standard Specification for Gravity-Convection and Forced-Ventilation Ovens 2017 by the American Association
8、 of State Highway and Transportation Officials. All rights reserved. Duplication is a violation of applicable law.TS-4e T 367-2 AASHTO 3. TERMINOLOGY 3.1. Definition: 3.1.1. hot-poured asphalt crack sealantpolymer- or rubber-modified asphalt binder most often formulated with a mineral filler. Note 1
9、Based on the references, hot-poured asphalt crack sealant is typically applied at a temperature of 160C or above. 4. SUMMARY OF METHOD 4.1. Hot-poured asphalt crack sealant material is placed in a stainless steel pan and aged at 115C for 16 h under a vacuum of 75.9 cmHg. 5. SIGNIFICANCE AND USE 5.1.
10、 This procedure is designed to simulate the aging and weathering of hot-poured asphalt crack sealant. 5.2. Hot-poured asphalt crack sealant material aged with this procedure is best used to evaluate sub-zero characteristics. 5.3. For hot-poured asphalt crack sealant materials with different asphalt
11、binder sources, polymer grades, and filler types and content, there is no unique correlation between the accelerated conditions and the time of in-service weathering. The accelerated aging leads to hot-poured asphalt crack sealant rheology typical of sealants weathered 1 to 10 years in the field. 5.
12、4. Hot-poured asphalt crack sealant must be remixed before being aged by this method. 6. APPARATUS 6.1. Vacuum OvenOven with a vacuum valve, a bleed valve, and a pressure gauge in centimeters of mercury (cmHg). The oven must be capable of maintaining a vacuum of 75.9 2 cmHg and a uniform temperature
13、 of 115 1C. Refer to ASTM E145 to verify temperature uniformity. The oven should be of a size sufficient to accommodate a minimum of eight sample pans of 6 in. diameter on two shelves. 6.2. Vacuum PumpA one- or two-stage mechanical pump capable of achieving a vacuum of 99.9 percent or better in 10 m
14、in or less. (See Note 2.) Note 2At sea level, the achievable vacuum is 76 cmHg. See the Appendix for the effect of elevation on the achievable vacuum reading. 6.3. Laboratory OvenCalibrated Type IIA oven specified in ASTM E145. This oven can produce and maintain a temperature of 180 0.5C. 6.4. Stain
15、less Steel PansPans of sufficient dimensions for containing 35 g of melted sealant. (See Note 3.) Note 3PAV pans, used in R 28, work well for the purpose of Section 6.4. 2017 by the American Association of State Highway and Transportation Officials. All rights reserved. Duplication is a violation of
16、 applicable law.TS-4e T 367-3 AASHTO 7. HAZARDS 7.1. Standard laboratory caution should be used in handling and remixing hot-poured asphalt crack sealant in accordance with ASTM D5167. 8. VERIFICATION AND STANDARDIZATION 8.1. Temperature and vacuum control of the ovens should be verified and standar
17、dized according to the standard recommended practices for establishing and implementing a quality management system for construction materials testing laboratories (AASHTO R 18) or each users quality assurance program. 8.2. Temperature DetectorVerify the calibration of the temperature-sensing device
18、 to 0.1C every 6 months in accordance with ASTM E77 for liquid-in-glass thermometers. 8.3. Vacuum GaugeStandarize the vacuum gauge to an accuracy of 1 percent every 6 months. 8.4. Verify that the sought temperature is obtained within 1 h after the application of vacuum. An example is shown in Figure
19、 1. Figure 1Typical Change in Temperature over Time at Top and Bottom Shelf of a Vacuum Oven before and after Evacuation 9. PREPARATION 9.1. Apply vacuum and preheat the vacuum oven to 115 1C. This typically takes 2 to 4 h. 9.2. Preheat the laboratory oven to 180 5C. 9.3. Melt and homogenize 400 to
20、500 g of hot-poured asphalt crack sealant material following the procedures outlined in ASTM D5167 specified for solid materials. Pour 35 0.5 g of hot material into a stainless steel pan. (See Note 4.) Note 4Homogenization should be done at the manufacturers recommended heating temperature for 1 hr
21、10 minutes. Note 5At the same time, samples can be poured for other tests, including the viscosity test (T 366), the low-temperature tests (T 368 and T 369), and the adhesion test (T 370). 2017 by the American Association of State Highway and Transportation Officials. All rights reserved. Duplicatio
22、n is a violation of applicable law.TS-4e T 367-4 AASHTO 10. PROCEDURE 10.1. Close the vacuum valve on the vacuum oven and slowly open the bleed valve. Once atmospheric pressure is reached, open the door and place the sealant pan in the oven. The oven door must be left opened for less than 1 min. Rea
23、pply vacuum by opening the vacuum valve. (See Note 6.) Note 6During this step, the vacuum pump must be left running. 10.2. Start timing once the vacuum has reached 73.3 cmHg. Maintain a vacuum better than 73.7 cmHg and a temperature of 115 1C for 16 h 10 min. 10.3. After 16 h, slowly release the vac
24、uum with the bleed valve and transfer the pan to the oven preheated to 180C. Heat the sealant for 5 min or until it is sufficiently fluid to pour into shape for the tests according to T 368, T 369, or T 370. Pans may be scraped to collect maximum amount of sealant. (See Note 7.) Note 7Allow 24 h at
25、room temperature before an evaluation of the properties according to T 368, T 369, or T 370. 11. REPORT 11.1. Report the following information: 11.1.1. Sealant name and supplier; 11.1.2. Lot number and date received; 11.1.3. Date aged; 11.1.4. Aging temperature and vacuum; 11.1.5. Total aging time i
26、n hours and minutes; and 11.1.6. Any deviations from test temperature and vacuum. 12. PRECISION AND BIAS 12.1. The precision and the bias for this method of test have not been measured. 13. KEYWORDS 13.1. Aging; cracks; guidelines; hot-poured asphalt crack sealant; joints; maintenance; pavement; roa
27、dways; specification. 14. REFERENCES 14.1. Al-Qadi, I. L., J. F. Masson, E. Fini, S. H. Yang, and K. K. McGhee. Development of Performance-Based Guidelines for Selection of Bituminous-Based Hot-Poured Pavement Crack Sealant: An Executive Summary Report. VTRC 09-CR7. Virginia Transportation Research
28、Council, Charlottesville, VA, 2009. Available online at http:/vtrc.virginiadot.org/PubDetails.aspx?PubNo=09-CR7 2017 by the American Association of State Highway and Transportation Officials. All rights reserved. Duplication is a violation of applicable law.TS-4e T 367-5 AASHTO 14.2. Al-Qadi, I. L.,
29、 J. F. Masson, A. Loulizi, P. Collins, J. R. Woods, S. Bundalo-Perc, and K. K. McGhee. Long-Term Accelerated Aging and Low Temperature BBR Testing of Sealants. Interim Report No. B5508-5, National Research Council of Canada, 2004, p. 262. 14.3. Al-Qadi, I. L., S. H. Yang, M. A. Elseifi, S. Dessouky,
30、 A. Loulizi, J. F. Masson, and K. K. McGhee. Characterization of Low Temperature Creep Properties of Crack Sealants Using Bending Beam Rheometry, Final Report. No. ICT-08-029, Illinois Center for Transportation, Rantoul, IL, December 2008. Available online at https:/www.ideals.illinois.edu/bitstream
31、/handle/2142/45989/ICT-08-029.pdf?sequence=2 14.4. Al-Qadi, I. L., S. H. Yang, J. F. Masson, and K. K. McGhee. Characterization of Low Temperature Mechanical Properties of Crack Sealants Utilizing Direct Tension Test, Final Report. No. ICT-08-028, Illinois Center for Transportation, Rantoul, IL, Dec
32、ember 2008. Available online at https:/www.ideals.illinois.edu/bitstream/handle/2142/45988/ICT-08-028.pdf?sequence=2 14.5. Al-Qadi, I. L., E. H. Fini, H. D. Figueroa, J. F. Masson, and K. K. McGhee. Adhesion Testing Procedure for Hot-Poured Crack Sealants, Final Report. No. ICT-08-026, Illinois Cent
33、er for Transportation, Rantoul, IL, December 2008. Available online at https:/www.ideals.illinois.edu/bitstream/handle/2142/45986/ICT-08-026.pdf?sequence=2 14.6. Collins, P., M. Veitch, J. F. Masson, and I. L. Al-Qadi. “Deformation and Tracking of Bituminous Sealants in Summer Temperatures: Pseudo-F
34、ield Behavior.” International Journal of Pavement Engineering, Vol. 9, No. 1, 2008, pp. 18. APPENDIX (Nonmandatory Information) X1. EFFECT OF ELEVATION ON THE ACHIEVABLE VACUUM READING X1.1. The vacuum reading on the oven gauge depends on the atmospheric pressure outside the oven, which depends on e
35、levation (excluding the effect of weather on pressure). The maximum achievable vacuum reading (P) at an elevation h is given by P(h) = P0exp(mgh/kT) (X1.1) where: P0 = the pressure at sea level; m = the average molar mass of dry air; g = the acceleration due to gravity; k = the Boltzmann constant; a
36、nd T = the temperature in Kelvin. X1.2. Considering a laboratory temperature of 22C and vacuum readings in centimeters of mercury, Equation X1.1 can be simplified to P(h) = 76 exp(hc) (X1.2) 2017 by the American Association of State Highway and Transportation Officials. All rights reserved. Duplicat
37、ion is a violation of applicable law.TS-4e T 367-6 AASHTO where: h = the elevation in m; and c = 0.0001151 m1. As examples, in Denver, CO, the elevation is 1656 m and the maximum attainable vacuum is 62.7 cmHg. In Edmonton, AB, with an elevation of 650 m, the achievable vacuum is 70.6 cmHg; and in O
38、ttawa, ON, the elevation is 188 m, so the achievable vacuum is 74.4 cmHg. 1Formerly AASHTO Provisional Standard TP 86. First published as a full standard in 2017. 2017 by the American Association of State Highway and Transportation Officials. All rights reserved. Duplication is a violation of applicable law.
