Definition of rutting of Asphalt Pavement

Definition: rutting is the longitudinal strip of the wheel trace at the depth of more than 10mm.

According to the degree of development of the rut, the highway technical condition assessment standard (H20-2015 JTG) will be divided into two levels of light and heavy:

Light: rut shallow depth between 10~15mm, according to the length of damage calculation, the test results to influence width (0.4m) converted into square meters.

Weight: rut depth, depth of more than 15mm, damage by the length calculation, the test results to influence width (0.4m) converted into the area.

Classification of rutting:

Usually we will be divided into four types of rutting: instability rutting, structural type rutting, wear type rutting and compaction type rut.

1 instability rutting

Asphalt pavement in high temperature condition, in the traffic loads of its internal material lateral flow deformation and the rutting, usually occurs in the wheel track, uplift on both sides, is W, mainly due to lack of high temperature stability of asphalt mixture, this kind of rutting is the main research object at present.

2 structure type rut

This kind of rutting is formed by the deformation of the pavement structure under the action of traffic load. This kind of rutting mainly due to the lack of roadbed strength caused by the general width of the larger, both sides of the phenomenon is not raised, cross section into a shallow basin shaped U. Due to the use of semi - rigid base in our country, this kind of rutting production is less.

3 wear rutting

Due to the formation of losses sustained in the top layer of asphalt pavement materials in the wheel wear and the natural environment factors, the use of automobile anti-skid chain and nail the tire, the more prone to this type of rutting rutting is common in allowing the use of buried nails tire countries, while in China No.

4 compaction rut

In asphalt paving process may be due to insufficient compaction or for one-sided pursuit of flatness in the situation of low temperature rolling caused by inadequate compaction, may also be due to improper mixture design. The surface layer below the rear open traffic trace continue to be compacted, resulting in compaction deformation. This kind of rutting is less in foreign countries, but in our country, it often happens, it is not normal.

Three

Damage of asphalt pavement rut

Rutting is one of the typical diseases of asphalt pavement, rut Valley asphalt mixture is further compaction and thinning; rut peak pavement thickness, but loose. This structural change of road surface leads to decrease of the whole strength and become the source of other diseases.

Rut to the safe running of vehicles pose a threat, because the car will happen Shuipiao rutting water; because of splashing into the mist, affect the driver's attention; the water once frozen, the adverse brake. Rut back to the vehicle overtaking, the replacement of the lanes are difficult and dangerous.

Rutting on the road around the environment also have a negative impact, according to the survey, when the rut in the water thick 25mm, large car through the water will be able to splash 10 ~ 15m. Because of the existence of the rut, the vibration of the automobile is increased, which brings greater noise pollution to the residents along the road.

Causes of rutting

Rutting is one of the common failure forms of asphalt pavement, its formation is very complex, and it can be summed up as internal factors and external factors. Internal factors mainly include the quality of pavement materials and pavement structure, external factors, including climatic conditions and traffic conditions, etc.. The internal factors include the characteristics of mineral aggregate, gradation, the performance of asphalt binder, the interaction between asphalt and mineral aggregate and the pavement structure:

1 aggregate characteristics

It is generally believed that the high temperature anti rut resistance of asphalt mixture is 60%, which depends on the extrusion force of aggregate, and the effect of aggregate on the aggregate gradation and surface characteristics. The aggregate shape and surface roughness of asphalt mixture embed function strength and internal friction angle size. Aggregate, hard texture, rough edges, particles close to the cube under normal circumstances, the asphalt mixture has better high temperature stability.

Packing refers to the aggregate of asphalt mixture in a particle size of less than 0.075mm, in China known as the filler, filler in order to reduce the gap is usually of asphalt mixture and asphalt mortar formation rate. The particle size, shape and extent and affect the performance of asphalt mortar, which will further affect the high temperature stability of asphalt mixture. In order to make the asphalt mixture has the necessary stability, need to have a certain amount of filler filler, but too much will make the hair brittle cracking of asphalt mixture and asphalt mortar, reduce the cohesion, while the asphalt mixture is easy to produce large plastic deformation, so we should strictly control the content of filler asphalt mixture.

2 grading

Grading is the most important of all the technical properties of aggregate, which can almost affect all the properties of asphalt mixture. The aggregate grading determines the size of the particle size of the aggregate and the density of the mixture, which directly affects the stability of the asphalt mixture. SHRP study shows that under normal circumstances, with the high temperature stability of asphalt mixture is superior to the reasonable gradation of discontinuous gradation asphalt mixture (except SMA). The gradation of the formation of the skeleton structure is little affected by the temperature, and has better high temperature resistance to rutting.

The particle size of aggregate has certain influence on the high temperature stability of asphalt mixture. The traditional view is that the more rough the aggregate is, the more favorable it is, but the rutting test shows that the

Definition of rutting of Asphalt Pavement

Definition: rutting is the longitudinal strip of the wheel trace at the depth of more than 10mm.

According to the degree of development of the rut, the highway technical condition assessment standard (H20-2015 JTG) will be divided into two levels of light and heavy:

Light: rut shallow depth between 10~15mm, according to the length of damage calculation, the test results to influence width (0.4m) converted into square meters.

Weight: rut depth, depth of more than 15mm, damage by the length calculation, the test results to influence width (0.4m) converted into the area.

Classification of rutting:

Usually we will be divided into four types of rutting: instability rutting, structural type rutting, wear type rutting and compaction type rut.

1 instability rutting

Asphalt pavement in high temperature condition, in the traffic loads of its internal material lateral flow deformation and the rutting, usually occurs in the wheel track, uplift on both sides, is W, mainly due to lack of high temperature stability of asphalt mixture, this kind of rutting is the main research object at present.

2 structure type rut

This kind of rutting is formed by the deformation of the pavement structure under the action of traffic load. This kind of rutting mainly due to the lack of roadbed strength caused by the general width of the larger, both sides of the phenomenon is not raised, cross section into a shallow basin shaped U. Due to the use of semi - rigid base in our country, this kind of rutting production is less.

3 wear rutting

Due to the formation of losses sustained in the top layer of asphalt pavement materials in the wheel wear and the natural environment factors, the use of automobile anti-skid chain and nail the tire, the more prone to this type of rutting rutting is common in allowing the use of buried nails tire countries, while in China No.

4 compaction rut

In asphalt paving process may be due to insufficient compaction or for one-sided pursuit of flatness in the situation of low temperature rolling caused by inadequate compaction, may also be due to improper mixture design. The surface layer below the rear open traffic trace continue to be compacted, resulting in compaction deformation. This kind of rutting is less in foreign countries, but in our country, it often happens, it is not normal.

Three

Damage of asphalt pavement rut

Rutting is one of the typical diseases of asphalt pavement, rut Valley asphalt mixture is further compaction and thinning; rut peak pavement thickness, but loose. This structural change of road surface leads to decrease of the whole strength and become the source of other diseases.

Rut to the safe running of vehicles pose a threat, because the car will happen Shuipiao rutting water; because of splashing into the mist, affect the driver's attention; the water once frozen, the adverse brake. Rut back to the vehicle overtaking, the replacement of the lanes are difficult and dangerous.

Rutting on the road around the environment also have a negative impact, according to the survey, when the rut in the water thick 25mm, large car through the water will be able to splash 10 ~ 15m. Because of the existence of the rut, the vibration of the automobile is increased, which brings greater noise pollution to the residents along the road.

Causes of rutting

Rutting is one of the common failure forms of asphalt pavement, its formation is very complex, and it can be summed up as internal factors and external factors. Internal factors mainly include the quality of pavement materials and pavement structure, external factors, including climatic conditions and traffic conditions, etc.. The internal factors include the characteristics of mineral aggregate, gradation, the performance of asphalt binder, the interaction between asphalt and mineral aggregate and the pavement structure:

1 aggregate characteristics

It is generally believed that the high temperature anti rut resistance of asphalt mixture is 60%, which depends on the extrusion force of aggregate, and the effect of aggregate on the aggregate gradation and surface characteristics. The aggregate shape and surface roughness of asphalt mixture embed function strength and internal friction angle size. Aggregate, hard texture, rough edges, particles close to the cube under normal circumstances, the asphalt mixture has better high temperature stability.

Packing refers to the aggregate of asphalt mixture in a particle size of less than 0.075mm, in China known as the filler, filler in order to reduce the gap is usually of asphalt mixture and asphalt mortar formation rate. The particle size, shape and extent and affect the performance of asphalt mortar, which will further affect the high temperature stability of asphalt mixture. In order to make the asphalt mixture has the necessary stability, need to have a certain amount of filler filler, but too much will make the hair brittle cracking of asphalt mixture and asphalt mortar, reduce the cohesion, while the asphalt mixture is easy to produce large plastic deformation, so we should strictly control the content of filler asphalt mixture.

2 grading

Grading is the most important of all the technical properties of aggregate, which can almost affect all the properties of asphalt mixture. The aggregate grading determines the size of the particle size of the aggregate and the density of the mixture, which directly affects the stability of the asphalt mixture. SHRP study shows that under normal circumstances, with the high temperature stability of asphalt mixture is superior to the reasonable gradation of discontinuous gradation asphalt mixture (except SMA). The gradation of the formation of the skeleton structure is little affected by the temperature, and has better high temperature resistance to rutting.

The particle size of aggregate has certain influence on the high temperature stability of asphalt mixture. The traditional view is that the more rough the aggregate is, the more favorable it is, but the rutting test shows that the