ASTM D7405

This test method is used to identify the presence of elastic response in a binder and the change in elastic response at two different stress levels. Non-recoverable creep compliance has been shown to be an indicator of the resistance of an asphalt binder to permanent deformation under repeated load.

This test method is also useful as a surrogate for other test methods used to measure elasticity in asphalt binders such as Test Method D 5801 (Toughness and Tenacity), Test Method D 6084 (Elastic Recovery), and Test Method D 7175 (DSR phase angle).

1. Scope

1.1 This test method covers the determination of percent recovery and non-recoverable creep compliance of asphalt binders by means of Multiple Stress Creep and Recovery (MSCR) testing. The MSCR test is conducted using the Dynamic Shear Rheometer (DSR) at a specified temperature.

1.2 This standard is appropriate for unaged material, material aged in accordance with Test Method D 2872 (RTFO), material aged in accordance with Practice D 6521 (PAV), and material aged in accordance with both Test Method D 2872 and Practice D 6521.

Note 1—The majority of development work on this test method was performed on material aged in accordance with Test Method D 2872 (RTFO).

1.3 The percent recovery is intended to provide a means to determine the presence of elastic response and stress dependence of polymer modified and unmodified asphalt binders.

1.4 A precision and bias statement for this standard has not been developed at this time. Therefore, this standard should not be used for acceptance or rejection of a material for purchasing purposes.

1.5 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.

1.6 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

ASTM Standards
C670 Practice for Preparing Precision and Bias Statements for Test Methods for Construction Materials
D2872 Test Method for Effect of Heat and Air on a Moving Film of Asphalt (Rolling Thin-Film Oven Test)
D5801 Test Method for Toughness and Tenacity of Bituminous Materials
D6084 Test Method for Elastic Recovery of Bituminous Materials by Ductilometer
D6373 Specification for Performance Graded Asphalt Binder
D6521 Practice for Accelerated Aging of Asphalt Binder Using a Pressurized Aging Vessel (PAV)
D7175 Test Method for Determining the Rheological Properties of Asphalt Binder Using a Dynamic Shear Rheometer
D8 Terminology Relating to Materials for Roads and Pavements
AASHTO Standards
TP 70 Test Method for Multiple Stress Creep and Recovery (MSCR) of Asphalt Binder Using a Dynamic Shear Rheometer

Index Terms

asphalt binder; creep and recovery; DSR; dynamic shear rheometer; elastic recovery; MSCR; non-recoverable creep compliance; polymer modified asphalt; Asphalt binder; MSCR (multiple stress creep and recovery); Multiple stress creep and recovery (MSCR); Rheometers; ICS Number Code 91.100.50 (Binders. Sealing materials)

Citing ASTM Standards

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