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Asphalt Brittle Point Tester Instruction Manual

I. Purpose and Principle of the Instrument

The ductility test for asphalt is an unconventional test that has not yet been incorporated into standard specifications. As the temperature of asphalt materials decreases, they gradually transition from a viscous-plastic state to an elastic-brittle state. Consequently, their plasticity diminishes while their brittleness increases. This instrument is designed specifically to determine the brittle point of asphalt at low temperatures.

This testing instrument involves coating a specific metal sheet with a thin layer of asphalt. Inside an insulated container equipped with a cooling device, the metal sheet is bent by means of a handle. As the temperature decreases, the temperature of the asphalt film also gradually drops. When the temperature reaches a certain point and the asphalt film fractures under the specified bending conditions (as indicated by an alcohol thermometer), that temperature is defined as the asphalt’s brittle point.

II. Instrument Structure

Structural diagram:

The instrument consists of parts such as a base, an insulation cylinder, a thermometer, a lower clamp plate, an upper clamp head, a fixing rod, a movable rod, a pedestal, a guide rail, a slider, and a handle.

The base is the support for the instrument.

The thermal insulation cylinder is a double-walled glass cylinder used to hold a mixture of solid carbon dioxide (dry ice) and ethanol; it serves as the instrument’s cooling device.

Fixed metal plates used for the lower clamp and upper chuck.

The fixed rod and the movable rod are made of cloth-reinforced adhesive tape, overcoming the shortcomings of the original metal-tube asphalt brittleness tester’s instruction manual.

I. Purpose and Principle of the Instrument

II. Instrument Structure

Structural diagram:

The base is the support for the instrument.

The thermal insulation cylinder is a double-walled glass cylinder used to hold a mixture of solid carbon dioxide (dry ice) and ethanol; it serves as the instrument’s cooling device.

Fixed metal plates used for the lower clamp and upper chuck.

The fixed rod and the movable rod are made of cloth-reinforced adhesive tape, overcoming the issue of initial oscillation in the handle of the original metal tube. The speed of swinging the handle is controlled at five revolutions per second. At this speed, the slider rises from the first step to the second step, with a height difference of 3.5 millimeters. Simultaneously, the steel strip bends into an arc shape. Then, at the same speed, the handle is swung back in the opposite direction, returning to its original position (the first step), where the steel strip straightens out again.

For every 10°C decrease in temperature, repeat the above steps once.

8. The temperature at which cracks first appear in the specimen is defined as the brittle point of that asphalt sample.

9. Record the experimental results in the table below.

Test Number				Sample Source
Trial Name				Proposed Use
Number of trials	Sample weight (grams)	Cooling rate (℃/minute)	Start handle temperature (℃)		Brittleness (℃)	Average
1 2 3

Tester: Date: Reviewer: Date:

IV. Instructions

1. The arithmetic mean of three parallel trials shall be taken as the brittle point for each determination.

The difference in crispness shall not exceed 30°C.

2. Each instrument is equipped with four stainless steel sheets, which must be flattened and stored in the dry instrument case when not in use.

Company Profile

Hebei Yinfeng Experimental Instrument Co., Ltd. is a high-tech enterprise dedicated to the research and development, production, and sales of experimental instruments. The company is headquartered in Hebei Province, relying on the strong industrial foundation and technological innovation resources in the Beijing Tianjin Hebei region. It is committed to providing high-precision and high reliability testing equipment and solutions for material testing, engineering quality control, scientific research experiments and other fields.

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Asphalt Waterproof Membrane Dimensional Stability Tester

Asphalt Extractor

Asphalt Brittle Point Tester

Instructions for Use of the Asphalt Brittleness Tester I. Purpose and Principle of the Instrument The asphalt brittleness test is an unconventional test that has not yet been incorporated into standard specifications. As the temperature of asphalt material decreases, it gradually transitions from a viscous-plastic state to an elastic-brittle state, resulting in reduced plasticity and increased brittleness. This instrument measures the brittleness point of asphalt at low temperatures. In this test, a thin film of asphalt is coated onto a specific metal sheet. The metal sheet is bent by means of a handle within an insulated container equipped with a cooling device. As the temperature drops, the temperature of the asphalt film also gradually decreases. When the temperature reaches a certain point, the temperature at which the asphalt film fractures under specified bending conditions—indicated by an alcohol thermometer—is defined as the asphalt’s brittleness point. II. Instrument Structure Structural Diagram: The instrument consists of the following components: base, insulated container, thermometer, lower clamp plate, upper clamp head, fixed rod, movable rod, base platform, guide rail, slider, handle, and other parts. The base serves as the instrument’s support. The insulated container is a double-layer glass cylinder used to hold a mixture of solid carbon dioxide (dry ice) and ethanol; it functions as the instrument’s cooling device. The lower clamp plate and upper clamp head are made of fixed metal sheets. The fixed rod and movable rod are constructed using cloth-covered adhesive tape, overcoming the drawbacks of the original metal tubes. Instructions for Use of the Asphalt Brittleness Tester I. Purpose and Principle of the Instrument The asphalt brittleness test is an unconventional test that has not yet been incorporated into standard specifications. As the temperature of asphalt material decreases, it gradually transitions from a viscous-plastic state to an elastic-brittle state, resulting in reduced plasticity and increased brittleness. This instrument measures the brittleness point of asphalt at low temperatures. In this test, a thin film of asphalt is coated onto a specific metal sheet. The metal sheet is bent by means of a handle within an insulated container equipped with a cooling device. As the temperature drops, the temperature of the asphalt film also gradually decreases. When the temperature reaches a certain point, the temperature at which the asphalt film fractures under specified bending conditions—indicated by an alcohol thermometer—is defined as the asphalt’s brittleness point. II. Instrument Structure Structural Diagram: The instrument consists of the following components: base, insulated container, thermometer, lower clamp plate, upper clamp head, fixed rod, movable rod, base platform, guide rail, slider, handle, and other parts. The base serves as the instrument’s support. The insulated container is a double-layer glass cylinder used to hold a mixture of solid carbon dioxide (dry ice) and ethanol; it functions as the instrument’s cooling device. The lower clamp plate and upper clamp head are made of fixed metal sheets. The fixed rod and movable rod are constructed using cloth-covered adhesive tape, overcoming the drawbacks of the original metal tubes. Initially, the instrument’s handle was designed to cause oscillation. The speed of handle movement should be controlled at five rotations per second. At this speed, the slider rises from the first step to the second step, with a height difference of 3.5 millimeters. The steel strip then bends into an arc shape accordingly. Afterward, the handle is swung back at the same speed, returning to its original position (the first step), and the steel strip straightens out again. Each time the temperature drops by 10°C, repeat the above steps once. 8. The temperature at which cracks appear in the specimen is defined as the brittleness point of that asphalt sample. 9. Record the experimental results in the table below: Experiment Number Sample Source Test Name Preliminary Intended Use Number of Tests Sample Weight (grams) Cooling Rate (°C/minute) Starting Handle Swing Temperature (°C) Brittleness Point (°C) Average Value 1 2 3 Examiner: Date: Reviewer: Date: IV. Notes 1. The arithmetic mean of three parallel tests shall be taken as the brittleness point. The difference between each measurement of the brittleness point must not exceed 30°C. 2. Each instrument is equipped with four stainless steel strips. When not in use, they must be flattened and stored in a dry instrument case.

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