1、Standard Practice for Grading or Verifying the Sealant Grade (SG) of a Hot-Poured Asphalt Crack Sealant AASHTO Designation: PP 85-171Technical Section: 4e, Joints, Bearings, and Geosynthetics Release: Group 2 (June 2017) American Association of State Highway and Transportation Officials 444 North Ca
2、pitol Street N.W., Suite 249 Washington, D.C. 20001 TS-4e PP 85-1 AASHTO Standard Practice for Grading or Verifying the Sealant Grade (SG) of a Hot-Poured Asphalt Crack Sealant AASHTO Designation: PP 85-171Technical Section: 4e, Joints, Bearings, and Geosynthetics Release: Group 2 (June 2017) 1. SCO
3、PE 1.1. This standard practice describes the testing required to determine the sealant grade (SG) of a hot-poured asphalt crack sealant according to MP 25, Table 1. It presents two approaches. In the first, the SG of an unknown hot-poured asphalt crack sealant is determined. In the second, the nomin
4、al SG of a hot-poured asphalt crack sealant is verified. It also provides an estimate of the time required to complete a single test sequence. 1.2. This standard practice may involve hazardous material, operations, and equipment. This standard does not purport to address all of the safety concerns a
5、ssociated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practice and determine the applicability of regulatory limitations prior to use. 2. REFERENCED DOCUMENTS 2.1. AASHTO Standards: MP 25, Performance-Graded Hot-Poured Asphalt Crack
6、Sealant T 315, Determining the Rheological Properties of Asphalt Binder Using a Dynamic Shear Rheometer (DSR) T 366, Apparent Viscosity of Hot-Poured Asphalt Crack Sealant Using Rotational Viscometer T 367, Accelerated Aging of Hot-Poured Asphalt Crack Sealant Using a Vacuum Oven T 368, Measuring Lo
7、w-Temperature Flexural Creep 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 a Direct
8、 Adhesion Tester T 371, Measuring Interfacial Fracture Energy of Hot-Poured Asphalt Crack Sealant Using a Blister Test TP 126, Evaluation of the Tracking Resistance of Hot-Poured Asphalt Crack Sealant by Dynamic Shear Rheometer (DSR) 2.2. ASTM Standard: 2017 by the American Association of State High
9、way and Transportation Officials.All rights reserved. Duplication is a violation of applicable law.TS-4e PP 85-2 AASHTO D5167, Standard Practice for Melting of Hot-Applied Joint and Crack Sealant and Filler for Evaluation 3. SUMMARY OF THE PRACTICE 3.1. The homogenized sample of hot-poured asphalt c
10、rack sealant obtained according to ASTM D5167 is tested to determine viscosity after 1 hr 10 minutes at the installation temperature recommended by the manufacturer (T 366) and sealant flow and deformation (TP 126). 3.2. The hot-poured asphalt crack sealant is aged in the vacuum oven (T 367), and th
11、e residue is tested to determine the creep stiffness (S) and average creep rate of the log creep stiffness versus log time relationship at 240 s (T 368), extendibility in direct tension (T 369), and maximum adhesion load (T 370). 3.3. Based on these test results, the hot-poured asphalt crack sealant
12、 is graded according to MP 25, Table 1. 4. SIGNIFICANCE AND USE 4.1. This practice describes the testing required for grading or verifying the SG of a hot-poured asphalt crack sealant according to MP 25, Table 1. 5. ESTIMATED TIME NECESSARY FOR TESTING 5.1. For both testing and verification, if the
13、analysis is started at the beginning of a morning work shift, all testing and analysis should be completed during the afternoon of the next day. This schedule provides the 16 h needed for conditioning of hot-poured asphalt crack sealant material in the vacuum oven. Samples can be aged and analyzed i
14、n parallel, and the productivity of the laboratory thus increased. However, for the purpose of this document, analysis of a single hot-poured asphalt crack sealant will be discussed. 6. TEST PROCEDURE FOR GRADING AN UNKNOWN HOT-POURED ASPHALT CRACK SEALANT 6.1. Prepare samples and test specimens usi
15、ng the procedures specified in the applicable test methods. In the case where the grade of a hot-poured asphalt crack sealant is unknown, approximately 550 g of unaged hot-poured asphalt crack sealant is required to complete the tests with the necessary replicates. 6.2. Homogenize the hot-poured asp
16、halt crack sealant according to ASTM D5167. Homogenize a sufficient amount of hot-poured asphalt crack sealant depending on the type and number of tests to be performed. Note 1Four crack sealant bending b eam rheometer (CSBBR) beam specimens requiring Vacuum Oven Aged (VOA) residue are needed at eac
17、h test temperature. In addition, at least six crack sealant direct tension (CSDT) specimens and six crack sealant adhesion test (CSAT) specimens requiring VOA residue will also be needed at each test temperature. A minimum of two test temperatures will be required. This testing will utilize approxim
18、ately 300 g of homogenized hot-poured asphalt crack sealant material. 2017 by the American Association of State Highway and Transportation Officials.All rights reserved. Duplication is a violation of applicable law.TS-4e PP 85-3 AASHTO 6.3. Determine the viscosity of the homogenized hot-poured aspha
19、lt crack sealant at installation temperature using T 366. The viscosity shall be higher than 1.0 Pa.s and must not exceed 3.5 Pa.s to meet the requirements of MP 25. Note 2The installation temperature s hould be in accordance with the manufacturers recommendation for each hot-poured asphalt crack se
20、alant type. 6.4. If the homogenized hot-poured asphalt crack sealant does not meet MP 25 requirements for the test in Section 6.3, the hot-poured asphalt crack sealant will not satisfy the specification for any SG, and no further testing is required. 6.5. Perform the DSR test (TP 126) on the homogen
21、ized hot-poured asphalt crack sealant beginning at 64C, and increase or decrease the test temperature at 6.0C increments until a value for flow coefficient 4 kPa.s and a value for shear thinning 0.7 is obtained. The highest test temperature where the value for flow coefficient 4 kPa.s and a value fo
22、r shear thinning 0.7 are obtained determines the starting high temperature SG grade. Note 3For example, if flow coefficient is 3.4 kPa.s and shear thinning is 0.63 at 70C and flow coefficient is 4.1 kPa.s and shear thinning is 0.84 at 64C, the starting grade of the hot-poured asphalt crack sealant i
23、s SG 64-xx. 6.6. Age a sufficient quantity of homogenized hot-poured asphalt crack sealant material in the vacuum oven (T 367). Quantities can be estimated based on the number of test samples needed as indicated in Note 1. Note 4Testing for Sections 6.1 through 6.6 can be completed during t he first
24、 day of testing. This schedule allows further testing to begin on the second day after VOA is completed. 6.7. At the conclusion of the VOA procedure (T 368), including aging and combining the hot-poured asphalt crack sealant residue, prepare four CSBBR specimens for each test temperature according t
25、o TP 86. Retain sufficient residue to prepare at least six CSDT specimens or six CSAT specimens for each test temperature. 6.8. Perform the CSBBR test (T 368) on the VOA hot-poured asphalt crack sealant residue beginning at 22C, and increase or decrease the test temperature at 6.0C increments until
26、a value for creep stiffness (S) 25 MPa at 240 seconds and a value for average creep rate 0.31 is obtained. The lowest test temperature where the value for creep stiffness (S) 25 MPa and a value for average creep rate 0.31 determines the initial low temperature for SG grade. Test fresh CSBBR specimen
27、s at each temperature. 6.9. Perform the CSDT test (T 369) on the VOA hot-poured asphalt crack sealant residue beginning at the initial low temperature SG grade determined by CSBBR test (T 368). The extendibility at the test temperature should meet the requirements of MP 25. If the extendibility is l
28、ower than the threshold, then increase the temperature by 6.0C and test the VOA hot-poured asphalt crack sealant residue again using the CSDT test. Continue increasing temperature increments until the extendibility is equal to or higher than the threshold defined by MP 25. 6.10. Perform the CSAT tes
29、t (T 370) on the VOA hot-poured asphalt crack sealant residue beginning at the low temperature SG grade determined by CSBBR test (T 368). Continue increasing temperature increments until the adhesion load is equal to or higher than the threshold defined by MP 25. If the adhesion load criteria is not
30、 satisfied the hot-poured asphalt crack sealant will fail to satisfy the requirements of the low temperature grade. 6.11. Using the results of Section 6.8 through 6.10, determine the final sealant grade (SG) of the hot-poured asphalt crack sealant. 2017 by the American Association of State Highway a
31、nd Transportation Officials.All rights reserved. Duplication is a violation of applicable law.TS-4e PP 85-4 AASHTO 7. TEST PROCEDURE FOR VERIFYING THE NOMINAL GRADE OF A HOT-POURED ASPHALT CRACK SEALANT 7.1. Prepare samples and test specimens using the procedures specified in the applicable test met
32、hods. In the case where the grade of the hot-poured asphalt crack sealant is being verified, approximately 300 g of unaged hot-poured asphalt crack sealant material is required to complete the tests with the necessary replicates. 7.2. Homogenize hot-poured asphalt crack sealant according to ASTM D51
33、67. Homogenize a sufficient amount of hot-poured asphalt crack sealant depending on the type and number of tests to be performed. Note 5Four CSBBR beam specimens requiri ng VOA residue are needed at each test temperature. In addition, at least six direct tension (CSDT) specimens and six adhesion tes
34、t (CSAT) specimens requiring VOA residue will also be needed at each test temperature. Only one test temperature will be required. This testing will utilize approximately 150 g of homogenized hot-poured asphalt crack sealant material. 7.3. Determine the viscosity of the homogenized hot-poured asphal
35、t crack sealant at installation temperature using T 366. The viscosity should be higher than 1.0 Pa.s and must not exceed 3.5 Pa.s to meet the requirements of MP 25. Note 6The installation temperature s hould be in accordance with the manufacturers recommendation for each hot-poured asphalt crack se
36、alant type. 7.4. If the homogenized hot-poured asphalt crack sealant does not meet MP 25 requirements for the test in Section 7.3, the hot-poured asphalt crack sealant will not satisfy the specification for any SG, and no further testing is required. 7.5. Perform the DSR test (TP 126) on the homogen
37、ized hot-poured asphalt crack sealant at the test temperature indicated by the high-temperature grade designation. For example, test a SG 64-28 hot-poured asphalt crack sealant at 64C. The value for flow coefficient must be 4 kPa.s and a value for shear thinning must be 0.7 to meet the requirements
38、of MP 25. Note 7This step verifies the startin g SG grade. For example, if a SG 58-34 is tested at 58C and the value for flow coefficient 4 kPa.s and a value for shear thinning 0.7, the high-temperature grade designation for the hot-poured asphalt crack sealant is verified to be SG 58-xx. Note 8If t
39、he hot-poured asphalt crack s ealant fails to meet the requirement of MP 25, Table 1 for the grade designated, it may be treated as a hot-poured asphalt crack sealant of unknown grade and tested according to Section 6, or the testing may be stopped because the grade was not verified. 7.6. Age a suff
40、icient quantity of homogenized hot-poured asphalt crack sealant material in the vacuum oven (T 367). Note 9Four CSBBR beam specimens requiri ng VOA residue are needed. In addition, six CSDT and six CSAT samples will also be needed requiring about 60 g of VOA hot-poured asphalt crack sealant residue.
41、 Note 10Complete Sections 7.1 through 7.6 during the first day of testing. This schedule will allow further testing to begin on the second day after VOA aging is completed. 7.7. At the conclusion of the VOA procedure (T 367), including aging and combining the hot-poured asphalt crack sealant residue
42、, prepare four CSBBR specimens according to T 368. Retain sufficient VOA residue to prepare at least six CSDT specimens or six CSAT specimens. 7.8. Test four CSBBR specimens according to T 368 at the test temperature specified in Table 1 of MP 25 for the high-temperature and low-temperature grading
43、designation of the hot-poured 2017 by the American Association of State Highway and Transportation Officials.All rights reserved. Duplication is a violation of applicable law.TS-4e PP 85-5 AASHTO asphalt crack sealant being verified. For example, test a SG 64-28 hot-poured asphalt crack sealant at 2
44、2C. The value for average creep rate must be 0.31 and a value for creep stiffness (S) at 240 s must be 25 to meet the requirements of MP 25. Certain hot-poured asphalt crack sealants may satisfy the BBR average creep rate requirement at a substantially lower temperature than they satisfy the BBR sti
45、ffness requirement (Note 7). 7.9. Test six CSDT specimens according to T 369 at the test temperature specified in Table 1 of MP 25 for the high-temperature and low-temperature grading designation of the hot-poured asphalt crack sealant being verified. For example, test a SG 64-28 hot-poured asphalt
46、crack sealant at 22C. The extendibility at the test temperature should meet the requirements of MP 25. The extendibility may be lower than the threshold (Note 7). 7.10. Test six CSAT specimens according to T 370 at the test temperature specified in Table 1 of MP 25 for the high-temperature and low-t
47、emperature grading designation of the hot-poured asphalt crack sealant being verified. For example, test a SG 64-28 hot-poured asphalt crack sealant at 22C. The adhesion load at the test temperature should meet the requirements of MP 25. If the adhesion load criteria is not satisfied the asphalt cra
48、ck sealant will fail to satisfy the requirements of the low temperature grade. 8. REPORT 8.1. If the grade of a hot-poured asphalt crack sealant tested is determined, report the results of all tests performed and the high-temperature grading designation determined, followed by the low-temperature de
49、signation (e.g., SG 70-22). 8.2. If the grade of a hot-poured asphalt crack sealant is verified, report the results of all tests performed and if the hot-poured asphalt crack sealant meets the requirements of MP 25, Table 1. 9. KEYWORDS 9.1. Hot-poured asphalt crack sealant; performance grading. 10. REFERENCES 10.1. Al-Qadi, I. L. and E. Fini. “Development of the Crack Sealant Adhesion Test (CSADT) Specification.” Journal of Testing and Evaluation, Vol. 39, No. 2. ASTM, 2011, pp. 17. 10.2. Al-Qadi, I. L., E. H. Fini, M.
