What performance of asphalt do the three index experiments represent asphalt?

The three major indicators point to penetration, ductility and softening point.

1. Penetration degree.

At the specified temperature of 25, the depth (1 10mm is one degree) of the standard needle with a specified mass of 100g penetrated into the asphalt sample within 5s of the specified time is expressed. The greater the penetration, the softer the asphalt and the less viscosity.

2. Ductility. The ductility meter is used to measure, and the asphalt sample is made into a figure-8 standard test mold, and the elongation length when pulled off at the specified tensile speed (5cm min) and the specified temperature (25) is expressed in cm. The larger the ductility value, the better the plasticity.

3. Softening point.

Using the global method, the asphalt sample is loaded into a copper ring of the specified size (diameter 16mm, height 6mm), a standard steel ball is placed on the sample, immersed in water and heated at the specified speed (5 min), the higher the softening point, the better the heat resistance.

The three major indicators point to penetration, ductility and softening point.

Penetration is simply hardness, ductility has low temperature ductility (5 degrees) and high temperature ductility (25 degrees) and 10 degrees 15 degrees, characterizing the plasticity of asphalt, softening point is a high temperature index, temperature sensitivity is characterized by penetration index, viscosity is generally characterized by 60 degrees dynamic viscosity.

Asphalt can be mainly divided into three types: coal coke asphalt, petroleum asphalt and natural asphalt

1. Coal coke asphalt: Coal coke asphalt is a product of coking, that is, the black substance that remains in the distillation kettle after tar distillation. It is only different from refined tar in physical properties, there is no obvious boundary, the general division method is to stipulate that the softening point below 26 7 (cube method) is tar, and above 26 7 is asphalt.

Coal coke asphalt mainly contains anthracene, phenanthrene, pyrene, etc., which are difficult to volatilize. These substances are toxic, and the properties of coke bitumen vary depending on the content of these components. The change of temperature has a great influence on the coal coke asphalt, which is easy to brittle in winter and easy to soften in summer.

It has a special smell when heated; After heating to 260 for 5 hours, the anthracene, phenanthrene, pyrene, and other components contained in it will volatilize.

2. Petroleum asphalt: Petroleum asphalt is the residue after distillation. Depending on the degree of refining, it is formed into a liquid, semi-solid or solid at room temperature.

Petroleum asphalt is black and shiny in color and has high temperature sensitivity. Because it has been distilled to more than 400 degrees in the production process, it contains very few volatile components, but there may still be polymer hydrocarbons that have not volatilized, and these substances are more or less harmful to human health.

3. Natural asphalt: Natural asphalt is stored underground, and some form ore layers or accumulate on the surface of the earth's crust. Most of this asphalt has been naturally evaporated and oxidized, and generally does not contain any toxins.

Asphalt materials are divided into two categories: ground asphalt and tar asphalt. Ground asphalt is divided into natural asphalt and petroleum asphalt, natural asphalt is the residue of oil seeping out of the surface after long-term exposure and evaporation; Petroleum bitumen is a product obtained by refining and processing petroleum residue oil after appropriate process treatment. Tar asphalt is a product of reprocessed tar obtained by dry distillation of organic matter such as coal and wood.

The vast majority of the asphalt used in the project is petroleum asphalt, which is a mixture of complex hydrocarbons and their non-metallic derivatives. Usually the flash point of asphalt is between 240 330, and the ignition point is about 3 6 degrees higher than the flash point, so the construction temperature should be controlled below the flash point.

The three major indicators of asphalt refer to: penetration, softening point, and ductility.

The main technical properties of asphalt materials include:

1. Viscosity: It is the ability of asphalt to resist shear deformation under the action of external force. The greater the viscosity (consistency) of asphalt, the better.

2. Temperature sensitivity: that is, temperature sensitivity, which is the characteristic of asphalt that changes its properties under the influence of temperature. The less sensitive bitumen is to temperature, the better.

3. Adhesion: refers to the ability of asphalt to resist water peeling after coating aggregate.

4. Aging properties: It refers to the irreversible quality attenuation of asphalt under the action of heat, oxygen, light radiation, rainwater, etc.

5. Rheological properties: including elasticity, plasticity, brittleness and toughness of asphalt.

1. Penetration degree.

At the specified temperature of 25, the depth (1 10mm is one degree) of the standard stove needle with a fixed mass of 100g is expressed in the specified time of 5s in the asphalt sample. The greater the penetration, the softer the asphalt and the less viscosity.

2. Ductility: The ductility meter is used to measure, and the asphalt sample is made into a figure-8 standard test mold, and the elongation length when pulled off at the specified tensile speed (5cm min) and the specified temperature (25) is expressed in cm. The larger the ductility value, the better the plasticity.

3. Softening point.

The asphalt sample was measured by the global method, and the asphalt sample was loaded into a copper ring of specified size (diameter 16mm, height 6mm), and a standard steel ball was placed on the sample, which was immersed in water and heated at a specified speed (5 min) to soften the asphalt and sag. The softening point is the temperature at which the sag is reached. The higher the softening cryptographic point, the better the heat resistance.

The three major indicators of asphalt refer to: penetration, softening point, and ductility.

Penetration: reflects the viscosity of petroleum asphalt, and can also be used as an indicator of labeling;

Softening the number of troubles: reflecting its high temperature, the higher the better;

Ductility: reflects its plasticity index. Return.

1. The three major indicators of asphalt are penetration, elongation and softening point, and the penetration degree reflects the viscosity of petroleum asphalt, and can also be used as an indicator for selling the missing label; The softening point reflects its high temperature and temperature, the higher the better; Elongation is an indicator of its plasticity.

2. Bitumen is a black-brown complex mixture composed of hydrocarbons of different molecular weights and their non-metallic derivatives, which is a kind of high-viscosity organic liquid, which is liquid and has a black surface and is soluble in carbon disulfide. Asphalt is an organic cementitious material that is waterproof, moisture-proof and anti-corrosion. Asphalt can be mainly divided into three types: coal coke asphalt, petroleum asphalt and natural asphalt.

The three major indicators of asphalt refer to: penetration, softening point, and ductility.

Penetration: reflects the viscosity of petroleum asphalt, and can also be used as an indicator of labeling;

Softening point: reflects its high temperature performance, the higher the better;

Ductility: reflects its plasticity index.

The three major indicators of asphalt are penetration, ductility and softening point. The greater the penetration, the softer the asphalt and the less viscosity. The ductility represents the plasticity of the asphalt, and the higher the value, the better the plasticity.

The higher the softening point, the worse the temperature sensitivity (better the temperature stability), which reflects the better the heat resistance of the asphalt. Asphalt penetration: The depth of the standard needle (100 per cent) perpendicular penetration of the specimen in a certain period of time at a specified temperature and weight, in units of 1 10mm.

Asphalt ductility: the extension length of the asphalt specimen of the specified shape, stretched to the time of pull-off at a certain speed at a specified temperature, expressed in cm. The ductility reflects the plasticity of the asphalt, and the larger the value, the better the plasticity.

Asphalt softening point: The specimen is in a metal ring of a specified size, a steel ball of a specified size and weight is placed on it, and the specimen is placed in 5 water (or glycerol.

It is heated at a speed of 5 min to the temperature when the sample softens and sinks to a specified distance, which is expressed as . The softening point reflects the viscosity of the asphalt and the thermal stability of the asphalt material. The three major indicators of asphalt are important technical indicators for dividing viscous petroleum asphalt into asphalt pavement.

The high temperature stability, low temperature crack resistance, fatigue resistance, water stability and durability have an impact.

Bitumen is made up of hydrocarbons of different molecular weights.

and its non-metallic derivatives composed of a complex mixture of black and brown, is a kind of high-viscosity organic liquid, mostly in the form of asphalt or tar, the surface is black, soluble in carbon disulfide.

Asphalt is a waterproof, moisture-proof and anti-corrosion organic cementitious material, which is mainly divided into three types: coal tar asphalt, petroleum asphalt and natural asphalt, which are used in coatings, plastics, rubber and other industries and paving roads.

The three major indicators of asphalt are penetration, softening point, and ductility.

The penetration degree indicates the viscosity of the asphalt, the larger the index, the lower the viscosity of the asphalt, and the higher the grade of the asphalt;

The softening point indicates the thermal stability of the asphalt, and the higher the softening point, the better the thermal stability of the asphalt. The softening point also indicates the isoradical adhesion temperature of the asphalt, which means that the higher the softening point, the higher the temperature required for the asphalt to achieve the same viscosity;

The ductility represents the plastic deformation capacity of asphalt, and the ductility obtained when the test temperature is low reflects the low-temperature performance of asphalt, and the larger the low-temperature ductility value, the better the low-temperature performance of asphalt.

The test conditions of the three major indicators of asphalt are penetration, ductility and softening point.

Penetration: At the specified temperature of 25, the depth of the standard needle with a specified mass of 100g penetrated into the asphalt sample within 5s of the specified time is expressed. The greater the penetration, the softer the asphalt and the less viscosity.

Ductility brightness: The asphalt sample is made into a figure-8 standard test mold by using a ductility meter, and the elongation length when it is pulled off at the specified tensile speed and specified temperature is expressed in centimeters. The larger the ductility value, the better the plasticity.

Softening point: The asphalt sample is loaded into a copper ring of the specified size, and a standard steel ball is placed on the sample, which is immersed in water and heated at the specified speed to soften and sag. The softening point is the temperature at which the sag is reached.

The higher the softening point, the better the heat resistance. Bitumen is a complex mixture of black-brown hydrocarbons and their non-metallic derivatives of different molecular weights, which is a kind of high-viscosity organic liquid, which is liquid and has a black surface, and is soluble in carbon sulfide. Asphalt is an organic cementitious material that is waterproof, moisture-proof and anti-corrosion.