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ASTM-D7312:2007 Edition

ASTM-D7312:2007 Edition

$40.63

D7312-07 Standard Test Method for Determining the Permanent Shear Strain and Complex Shear Modulus of Asphalt Mixtures Using the Superpave Shear Tester (SST)

Published By Publication Date Number of Pages
ASTM 2007 8
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1.1 This standard provides performance-related test procedures for the determination of stiffness complex shear modulus and permanent shear strain of asphalt mixtures using the Superpave Shear Tester (SST). This standard is applicable to the testing and analysis of modified and unmodified asphalt mixtures.

1.2 This standard is applicable to specimens prepared in a laboratory or cored from a pavement for post-construction analysis. It is intended for use with specimens having the following minimum dimensions:

Nominal maximum aggregate size is defined in AASHTO R35 as one sieve larger than the first sieve to retain more than 10 % of the total aggregate. Asphalt mixtures with a nominal maximum aggregate size greater than 19 mm can be tested using this procedure, but it is not recommended. The larger aggregate sizes may significantly interfere with the material response, thereby affecting the repeatability of the test.Note 2

The SST shall accommodate test specimens of 150 mm in diameter and 50 mm in height. The specimen height of 50 mm is preferred, but may not be available in roadway cores where layer thickness may be less. If the specimen height is less than 50 mm, use platen to platen fixturing (Linear Variable Differential Transformers (LVDTs) or extensometers). Specimen heights less than 38 mm cannot be tested because of equipment constraints.

Note 3

The diameter-to-height ratio for shear test specimens should be 3:1 or greater. This effectively eliminates the use of 100 mm diameter specimens (because of minimum height requirement for testing discussed in NOTE 2).

1.3 The between laboratory reproducibility of this test method has not been determined, therefore this standard should not be used for acceptance or rejection of a material for purchasing purposes.

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.

PDF Catalog

PDF Pages PDF Title
1 Scope
Referenced Documents
2 Terminology
Summary of Test Method
Significance and Use
Apparatus
3 Test Specimens
4 Calibration and Standardization
Procedure A—Shear Frequency Sweep Test
5 Procedure B—Repeated Shear Test at Constant Height
Calculations
6 Report
Precision and Bias
Keywords
A1. MINIMUM TEST SYSTEM REQUIREMENTS
TABLE 1
TABLE A1.1
7 A2. REQUIRED INTERVAL RANGES FOR RECORDING DATA FOR PROCEDURE B
TABLE A2.1
TABLE A2.2
8 X1. CALCULATING AGGREGATE BATCH WEIGHTS
X1.1 Calculating Aggregate Batch Weight for LMLC Specimens
X1.2 Calculating Mixture Sample Weight for FMLC Specimens

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