ASTM D8303-20
Standard Test Method for Determining Thermal Cracking Properties of Asphalt Mixtures Through Measurement of Thermally Induced Stress and Strain

Standard No.

ASTM D8303-20

Release Date

2020

Published By

American Society for Testing and Materials (ASTM)

Latest

ASTM D8303-20

Scope

1.1 This method of test is used to determine the thermal viscoelastic and thermal volumetric properties of field-cored or laboratory-compacted asphalt mixture specimens by measuring the thermally induced stress and strain while being cooled at a constant rate from an initial equilibrium temperature. The thermal stress and strain shall be measured using the uniaxial thermal stress and strain tester (UTSST). 1.2 This standard test method covers procedures for preparing and testing asphalt mixtures to measure thermal stress and strain and directly calculate: (1) the coefficient of axial thermal contraction, and (2) the modulus of asphalt mixture over a range of temperatures. 1.3 The procedure described in this standard provides required information for estimation of thermal cracking susceptibility of asphalt mixtures. The procedure applies to test specimens having a maximum aggregate size of 19 mm or less. 1.4 This standard can be used for conventional and nonconventional asphalt mixtures including but not limited to: hot asphalt mixtures, asphalt mixture with recycled materials, cold asphalt mixtures, warm asphalt mixtures, and neat or modified asphalt mixtures (for example, polymer or rubber-modified). 1.5 This standard can be used to determine the following: 1.5.1 Thermal stress buildup in asphalt mixture during a single cooling event. 1.5.2 Thermal strain in asphalt mixtures as a function of temperature. 1.5.3 Coefficient of axial thermal contraction. 1.5.4 Modulus of asphalt mixture as a function of temperature. 1.5.5 Thermal viscoelastic properties of asphalt mixture: viscous softening, viscous-glassy transition, glassy hardening, crack initiation, fracture temperature, and fracture stress. 1.5.6 UTSST cracking resistance index (CRI). 1.5.7 UTSST CRI adjusted for environmental condition (CRIEnv). 1.6 Units—The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.7 The text of this standard references notes and footnotes which provide explanatory material. These notes and footnotes (excluding those in tables and figures) shall not be considered as requirements of the standard. 1.8 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.9 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

ASTM D8303-20 Referenced Document

• ASTM A36/A36M Standard Specification for Carbon Structural Steel
• ASTM D2041/D2041M Standard Test Method for Theoretical Maximum Specific Gravity and Density of Asphalt Mixtures
• ASTM D2726/D2726M Standard Test Method for Bulk Specific Gravity and Density of Non-Absorptive Compacted Asphalt Mixtures*， 2024-04-21 Update
• ASTM D3203/D3203M Standard Test Method for Percent Air Voids in Compacted Dense and Open Bituminous Paving Mixtures
• ASTM D3549/D3549M Standard Test Method for Thickness or Height of Compacted Asphalt Mixture Specimens*， 2023-05-01 Update
• ASTM D3665 Standard Practice for Random Sampling of Construction Materials
• ASTM D3666 Standard Specification for Minimum Requirements for Agencies Testing and Inspecting Road and Paving Materials*， 2024-04-21 Update
• ASTM D5361/D5361M Standard Practice for Sampling Compacted Asphalt Mixtures for Laboratory Testing*， 2022-12-15 Update
• ASTM D6752/D6752M Standard Test Method for Bulk Specific Gravity and Density of Compacted Asphalt Mixtures Using Automatic Vacuum Sealing Method*， 2023-11-01 Update
• ASTM D6857/D6857M Standard Test Method for Maximum Specific Gravity and Density of Asphalt Mixtures Using Automatic Vacuum Sealing Method*， 2023-11-01 Update
• ASTM D6925 Standard Test Method for Preparation and Determination of the Relative Density of Asphalt Mix Specimens by Means of the Superpave Gyratory Compactor*， 2023-12-01 Update
• ASTM D7981 Standard Practice for Compaction of Prismatic Asphalt Specimens by Means of the Shear Box Compactor
• ASTM D8 Standard Terminology Relating to Materials for Roads and Pavements
• ASTM D8079 Standard Practice for Preparation of Compacted Slab Asphalt Mix Samples Using a Segmented Rolling Compactor*， 2023-11-01 Update
• ASTM D979/D979M Standard Practice for Sampling Asphalt Mixtures*， 2022-11-01 Update
• ASTM F1684 Standard Specification for Iron-Nickel and Iron-Nickel-Cobalt Alloys for Low Thermal Expansion Applications

ASTM D8303-20 history

• 2020 ASTM D8303-20 Standard Test Method for Determining Thermal Cracking Properties of Asphalt Mixtures Through Measurement of Thermally Induced Stress and Strain