AASHTO TP 92-14

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Standard Method of Test for

Determining the Cracking

Temperature of Asphalt Binder

Using the Asphalt Binder

Cracking Device (ABCD)

AASHTO Designation: TP 92-141

American Association of State Highway and Transportation Officials

444 North Capitol Street N.W., Suite 249

Washington, D.C. 20001

TS-2b TP 92-1 AASHTO

Standard Method of Test for

Determining the Cracking Temperature

of Asphalt Binder Using the Asphalt

Binder Cracking Device (ABCD)

AASHTO Designation: TP 92-141

1. SCOPE

1.1. This test method covers the determination of cracking temperatures of asphalt binders by the

means of an Asphalt Binder Cracking Device (ABCD). This device can be used with unaged

material or with material aged using T 240 (RTFOT) or R 28 (PAV), or both. The test apparatus is

designed for testing a cracking temperature in the range of –60 to +20°C.

1.2. This standard may involve hazardous materials, operations, and equipment. This standard does

not purport to address all of the safety concerns associated with its use. It is the responsibility of

the user of this procedure to establish appropriate safety and health practices and to determine

the applicability of regulatory limitations prior to use.

2. REFERENCED DOCUMENTS

2.1. AASHTO Standards:

 R 28, Accelerated Aging of Asphalt Binder Using a Pressurized Aging Vessel (PAV)

 T 240, Effect of Heat and Air on a Moving Film of Asphalt Binder (Rolling Thin-Film Oven

Test)

2.2. ASTM Standard:

 C670, Standard Practice for Preparing Precision and Bias Statements for Test Methods for

Construction Materials

3. TERMINOLOGY

3.1. Definitions:

3.1.1. asphalt binder—an asphalt-based cement produced from petroleum residue with or without the

addition of particulate organic modifiers of a size less than 250 µm.

3.1.2. Invar—a nickel steel alloy with a low coefficient of thermal expansion (CTE). The typical CTE of

Invar is about 1.2 × 10–6/°C.

TS-2b TP 92-2 AASHTO

3.2. Description of Terms Specific to This Standard:

3.2.1. ABCD cracking temperature—the temperature at which a sudden reduction of compressive strain

on the ABCD ring occurs due to the fracture of a test specimen during the test specified in this

standard.

3.2.2. fracture stress—the maximum tensile stress in the specimen calculated from the strain jump at the

time of fracture.

3.2.3. strain jump—the amount of strain that the asphalt binder specimen releases when it cracks during

the test specified in this standard.

4. SUMMARY OF TEST METHOD

4.1. The asphalt binder cracking device measures the temperature and strain of a restrained asphalt

binder ring subjected to a constant rate of cooling.

4.2. Asphalt binder samples are heated and poured outside of an Invar ring placed in the center of a

silicone mold. The Invar ring includes a strain gauge to record the strain applied to it by

contraction of the asphalt binder during cooling and a surface-mounted resistance temperature

detector (RTD) to record the temperature of the sample.

4.3. Samples are cooled at a constant rate and the cracking of the asphalt binder sample is represented

as a jump in strain on a real-time plot.

4.4. The ABCD cracking temperature is determined by reading the temperature at the strain jump on a

strain versus temperature plot.

4.5. The strain jump is recorded and, through calculations, the fracture stress of the asphalt binder

specimen at the cracking temperature is determined.

5. SIGNIFICANCE AND USE

5.1.1. The thermal cracking temperature can be estimated directly without elaborate assumptions and

calculations by creating a condition similar to that encountered in the field.

5.1.2. The thermal stress and fracture strength can be determined from strain readings.

5.1.3. The low-temperature thermal cracking performance of asphalt pavements is related to the ABCD

cracking temperature of the asphalt binder contained in the pavement.

6. APPARATUS

6.1. Asphalt Binder Cracking Device (ABCD) System—System consisting of the following

components: (1) an air-cooled environmental chamber capable of being programmed to cool

specimens at a constant rate from a temperature of +25°C to a temperature of –60°C; (2) a

computer-controlled data acquisition system capable of real-time display and of recording strain,

temperature, and time readings; (3) ABCD rings; and (4) specimen molds.

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摘要：

AASHTO TP 92-14 是美国国家公路与运输协会（AASHTO）发布的一项标准试验方法，全称为“Standard Method of Test for Determining the Dynamic Modulus of Asphalt Mixtures Based on a Simplified Testing Protocol”。该标准旨在通过简化测试流程，更高效地测定热拌沥青混合料（HMA）及温拌沥青混合料（WMA）在不同温度与荷载频率下的动态模量值，为路面结构设计与性能评估提供关

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