1、 Standard Method of Test for Penetration of Bituminous Materials AASHTO Designation: T 49-15 ASTM Designation: D5/D5M-13American Association of State Highway and Transportation Officials 444 North Capitol Street N.W., Suite 249 Washington, D.C. 20001 TS-2b T 49-1 AASHTO Standard Method of Test for P
2、enetration of Bituminous Materials AASHTO Designation: T 49-15 ASTM Designation: D5/D5M-13AASHTO T 49-15 is identical to ASTM D5/D5M-13 except for the following provisions: 1. Replace all references to ASTM D36 with AASHTO T 53. 2. Add the following to Section 2: 2.4 AASHTO Standard: R 16, Regulator
3、y Information for Chemicals Used in AASHTO Tests 3. Replace the last sentence of Section 6.1 with the following: The weight of the spindle shall be checked. 4. Add the following sentence to the end of Section 7.2: If air bubbles are visible in the surface of the specimen, briefly flash the top of th
4、e specimen with a flame. 5. Replace Section 11 with the following: 11. Precision and Bias 11.1 PrecisionCriteria for judging the acceptability of penetration of asphalt binder results obtained by this method are given in Table X. Note: Precision data for penetration on asphalt residue of emulsified
5、asphalt can be found in T 59. 11.1.1 Single-Operator Precision (Repeatability)The figures in Column 2 of Table X are the standard deviations that have been found to be appropriate for the conditions of test described in Column 1. Two results obtained in the same laboratory, by the same operator usin
6、g the same equipment, in the shortest practical period of time, should not be considered suspect unless the difference in the two results exceeds the values given in Table X, Column 3. 11.1.2 Multilaboratory Precision (Reproducibility)The figures in Column 2 of Table X are the standard deviations th
7、at have been found to be appropriate for the conditions of test described in Column 1. Two results submitted by two different operators testing the same material in different laboratories shall not be considered suspect unless the difference in the two results exceeds the values given in Table X, Co
8、lumn 3. 2015 by the American Association of State Highway and Transportation Officials.All rights reserved. Duplication is a violation of applicable law.TS-2b T 49-2 AASHTO Table XPrecision Estimates of Penetration of Bituminous Materials Condition of Test and Test Property Standard Deviation 1sa,bA
9、cceptable Range of Two Test Results d2sa,bSingle-Operator Precision: 4C Original 1s = 0.01X + 0.8 d2s = (0.01X + 0.8) x 2.83 RTFO 1s = 0.02X + 0.4 d2s = (0.03X + 0.3) x 2.83 25C Original 1s = 0.01X + 0.7 d2s = (0.01X + 0.6) x 2.83 RTFO 1s = 0.01X + 0.5 d2s = (0.02X + 0.5) x 2.83 Multilaboratory Prec
10、ision: 4C Original 1s = 0.06X + 1.9 d2s = (0.06X + 2.0) x 2.83 RTFO 1s = 0.06X + 1.5 d2s = (0.07X + 1.5) x 2.83 25C Original 1s = 0.03X + 1.3 d2s = (0.02X + 1.8) x 2.83 RTFO 1s = 0.04X + 1.2 d2s = (0.04X + 1.2) x 2.83 aThese values represent the 1s and d2s limits described in ASTM Practice C670. bTh
11、e value of X represents the average value of two test results. Note: The precision estimates given in Table X are based on the analysis of test results from 21 pairs of AMRL Viscosity Graded Asphalt Cement proficiency samples. The data analyzed consisted of results from 71 to 97 laboratories for eac
12、h of the pairs of samples. The analysis included original asphalt cements with the average penetration value of 11.7 units to 44 units at 4C and 33.4 units to 128.9 units at 25C and RTFO residue with the average penetration value of 7.8 units to 27.2 units at 4C and 19.8 units to 68.4 units at 25C.
13、11.2 BiasNo information can be presented on the bias of the procedure because no comparison with a material having an accepted reference value was conducted. 2015 by the American Association of State Highway and Transportation Officials.All rights reserved. Duplication is a violation of applicable law.
