1、Standard Practice for Grading or Verifying the Sealant Grade (SG) of a Hot-Poured Asphalt Crack Sealant AASHTO Designation: PP 85-181Technical Section: 4e, Joints, Bearings, and Geosynthetics Release: Group 2 (June) American Association of State Highway and Transportation Officials 444 North Capitol
2、 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 85-181Technical Section: 4e, Joints, Bearings, and Geosynthetics Release: Group 2 (June) 1. SCOPE 1.1. Th
3、is 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 nominal SG of a
4、 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 associated
5、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 Sealant T
6、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 Low-Temperat
7、ure 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 Adhesion
8、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) 2018 by the American Association of State Highway and Transportation Officia
9、ls. All rights reserved. Duplication is a violation of applicable law.TS-4e PP 85-2 AASHTO 2.2. ASTM Standard: D5167, Standard Practice for Melting of Hot-Applied Joint and Crack Sealant and Filler for Evaluation 3. SUMMARY OF THE PRACTICE 3.1. The sample of hot-poured asphalt crack sealant is homog
10、enized in accordance with ASTM D5167 for 1 h 10 min at the manufacturers recommended installation temperature. Portions of the homogenized sample are used to test viscosity (T 366) and sealant flow and deformation (referred to as flow coefficient and shear thinning in TP 126). 3.2. The hot-poured as
11、phalt crack sealant is aged in the vacuum oven (T 367), and the 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. Bas
12、ed on these test results, the hot-poured asphalt crack sealant 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 NECESSA
13、RY FOR TESTING 5.1. For both testing and verification, if the 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 m
14、aterial in the vacuum oven. Samples can be aged and analyzed in 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 ASP
15、HALT CRACK SEALANT 6.1. Prepare samples and test specimens using 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 wit
16、h the necessary replicates. 6.2. Homogenize the hot-poured asphalt crack sealant according to ASTM D5167 for 1 h 10 min at the manufacturers recommended installation temperature. Homogenize a sufficient amount of hot-poured asphalt crack sealant depending on the type and number of tests to be perfor
17、med. Note 1Four crack sealant bending beam rheometer (CSBBR) beam specimens requiring Vacuum Oven Aged (VOA) residue are needed at each test temperature. In addition, at least six crack sealant direct tension (CSDT) specimens and six crack sealant adhesion test (CSAT) specimens requiring VOA residue
18、 will also be needed at each test temperature. A minimum of two test temperatures will be required. This testing will utilize approximately 300 g of homogenized hot-poured asphalt crack sealant material. 2018 by the American Association of State Highway and Transportation Officials. All rights reser
19、ved. Duplication is a violation of applicable law.TS-4e PP 85-3 AASHTO 6.3. Determine the viscosity of the homogenized hot-poured asphalt crack sealant at installation temperature using T 366. The viscosity shall be higher than 1.0 Pas and must not exceed 3.5 Pas to meet the requirements of MP 25. N
20、ote 2The installation temperature should be in accordance with the manufacturers recommendation for each hot-poured asphalt crack sealant 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
21、will not satisfy the specification for any SG, and no further testing is required. 6.5. Perform the DSR test (TP 126) on the homogenized 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 kPas and a
22、 value for shear thinning 0.7 is obtained. The highest test temperature where the value for flow coefficient 4 kPas and a value for shear thinning 0.7 are obtained determines the starting high temperature SG grade. Note 3For example, if flow coefficient is 3.4 kPas and shear thinning is 0.63 at 70C
23、and flow coefficient is 4.1 kPas and shear thinning is 0.84 at 64C, the starting sealant grade of the hot-poured asphalt crack sealant is 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
24、 the number of test samples needed as indicated in Note 1. Note 4Testing for Sections 6.1 through 6.6 can be completed during the first 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), includi
25、ng aging and combining the hot-poured asphalt crack sealant residue, prepare four CSBBR specimens for each test temperature according to 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
26、 VOA hot-poured asphalt crack sealant residue beginning at 22C, and increase or decrease the test temperature at 6.0C increments until a value for creep stiffness (S) 15 MPa at 240 seconds and a value for average creep rate 0.31 is obtained. The lowest test temperature where the value for creep stif
27、fness (S) 15 MPa and a value for average creep rate 0.31 determines the initial low temperature for SG grade. At the initial low temperature determined by the maximum stiffness criteria, check if creep stiffness (S) 40 MPa at 1 second. If creep stiffness (S) 40 MPa, then the sealants low temperature
28、 grade cannot be finalized. Test fresh CSBBR specimens at each temperature. Note 5Sealants satisfying maximum stiffness criteria but failing minimum stiffness criteria (creep stiffness (S) 40 MPa at 1 second) are very soft and prone to damage due to snow plowing operations. 6.9. If the crack treatme
29、nt selected is clean and seal (i.e., crack filling), 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.
30、If the extendibility is lower 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
31、.10. If the crack treatment selected is rout and seal (i.e., crack sealing), perform the CSAT test (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 loa
32、d is equal to or higher than the threshold defined by MP 25. If the adhesion load 2018 by the American Association of State Highway and Transportation Officials. All rights reserved. Duplication is a violation of applicable law.TS-4e PP 85-4 AASHTO criteria is not satisfied, the hot-poured asphalt c
33、rack sealant will fail to satisfy the requirements of the low temperature sealant 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. 7. TEST PROCEDURE FOR VERIFYING THE NOMINAL SEALANT GRADE OF A HOT-POURED ASPH
34、ALT CRACK SEALANT 7.1. Prepare samples and test specimens using the procedures specified in the applicable test methods. In the case where the sealant grade of the hot-poured asphalt crack sealant is being verified, approximately 300 g of unaged hot-poured asphalt crack sealant material is required
35、to complete the tests with the necessary replicates. 7.2. Homogenize hot-poured asphalt crack sealant according to ASTM D5167 for 1 h 10 min at the manufacturers recommended installation temperature. Homogenize a sufficient amount of hot-poured asphalt crack sealant depending on the type and number
36、of tests to be performed. Note 6Four CSBBR beam specimens requiring VOA residue are needed at each test temperature. In addition, at least six direct tension (CSDT) specimens and six adhesion test (CSAT) specimens requiring VOA residue will also be needed at each test temperature. Only one test temp
37、erature 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 asphalt crack sealant at installation temperature using T 366. The viscosity should be higher than 1.0 Pas and
38、must not exceed 3.5 Pas to meet the requirements of MP 25. Note 7The installation temperature should be in accordance with the manufacturers recommendation for each hot-poured asphalt crack sealant type. 7.4. If the homogenized hot-poured asphalt crack sealant does not meet MP 25 requirements for th
39、e 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 homogenized hot-poured asphalt crack sealant at the test temperature indicated by the high-temperature sealant grad
40、e designation. For example, test a SG 64-28 hot-poured asphalt crack sealant at 64C. The value for flow coefficient must be 4 kPas and a value for shear thinning must be 0.7 to meet the requirements of MP 25. Note 8This step verifies the starting SG grade. For example, if a SG 58-34 is tested at 58C
41、 and the value for flow coefficient 4 kPas and a value for shear thinning 0.7, the high-temperature sealant grade designation for the hot-poured asphalt crack sealant is verified to be SG 58-xx. Note 9If the hot-poured asphalt crack sealant fails to meet the requirement of MP 25, Table 1 for the sea
42、lant grade designated, it may be treated as a hot-poured asphalt crack sealant of unknown sealant grade and tested according to Section 6, or the testing may be stopped because the sealant grade was not verified. 7.6. Age a sufficient quantity of homogenized hot-poured asphalt crack sealant material
43、 in the vacuum oven (T 367). Note 10Four CSBBR beam specimens requiring 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. Note 11Complete Sections 7.1 through 7.6 during the first day of testin
44、g. This schedule will allow further testing to begin on the second day after VOA aging is completed. 2018 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 7.7. At the conclusion of the VO
45、A procedure (T 367), including aging and combining the hot-poured asphalt crack sealant residue, 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
46、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 crack sealant at 22C. The value for average creep rate must be 0.31 and a value for creep
47、 stiffness (S) at 240 s must be 15 and a value for creep stiffness (S) at 1 s must be 40 to meet the requirements of MP 25. 7.9. If the hot-poured asphalt crack treatment selected is clean and seal (i.e., crack filling), test six CSDT specimens according to T 369 at the test temperature specified in
48、 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 crack sealant at 22C. The extendibility at the test temperature should meet the requirements of MP 25. 7.10. If t
49、he crack treatment selected is rout and seal (i.e., crack sealing), 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-temperature 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 hot-poured asphalt
