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Significance and Use
Stress at failure is used in a mechanistic pavement cracking model to compute critical cracking temperature. The procedure to compute critical cracking temperature is described in Practice D6521. The critical cracking temperature is then used in specifying the low temperature grade of asphalt binder in accordance with Specification D6373.
The test method is designed to measure the strength of the asphalt binder at the critical cracking temperature. The asphalt binder has limited ability to resist stress without cracking. In the asphalt binder Specification D6373, failure stress is used to determine the critical cracking temperature.
For evaluating an asphalt binder for conformance to Specification D6373, the elongation rate of the gage section is 1.0 mm/min and the test temperature is selected from Table number 1 of Specification D6373 according to the grade of asphalt binder. Other rates of elongation and test temperatures may be used to test asphalt binders.
1.1 This test method covers the determination of the failure strain and failure stress of asphalt binders by means of a direct tension test. It can be used with unaged material or with material aged using Test Method D2872 (RTFOT), Practice D6521 (PAV), or AASHTO T240 (RTFOT) and AASHTO PP1 (PAV). The test apparatus is designed for testing within the temperature range from +6 to -36°C.
1.2 This test method is limited to asphalt binders containing particulate material having dimensions less than 250 µm.
1.3 The values stated in SI units are to be regarded as the standard.
1.4 This standard 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 appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.
C670 Practice for Preparing Precision and Bias Statements for Test Methods for Construction Materials
D8 Terminology Relating to Materials for Roads and Pavements
D140 Practice for Sampling Bituminous Materials
D2872 Test Method for Effect of Heat and Air on a Moving Film of Asphalt (Rolling Thin-Film Oven Test)
D6373 Specification for Performance Graded Asphalt Binder
D6521 Practice for Accelerated Aging of Asphalt Binder Using a Pressurized Aging Vessel (PAV)
E1 Specification for ASTM Liquid-in-Glass Thermometers
E4 Practices for Force Verification of Testing Machines
E77 Test Method for Inspection and Verification of Thermometers
E83 Practice for Verification and Classification of Extensometer Systems
E220 Test Method for Calibration of Thermocouples By Comparison Techniques
E691 Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method
Deutche Industrie Norm (DIN) Standard43760 Standard for Calibrating Thermocouples Deutsches Institut fur Normung e.V. (German Standards Institute), Beuth Verlag GmbH, Burggrafenstrasse 6, 10787, Berlin Germany.
ICS Number Code 91.100.50 (Binders. Sealing materials); 93.080.20 (Road construction materials)