Deterioration of asphalt concrete and its reason
Every year, millions of tons of asphalt in cities and intercity roads are destroyed (the cause of asphalt concrete failure) and thrown away, the street or road is reconstructed by spending energy, money, materials and road construction materials.
In the meantime, economic consequences include spending money and expenses, social consequences including closing roads and streets, creating noise and hindering the movement of citizens, environmental harms including the loss of road construction materials, indiscriminate extraction of mines, destruction of riverbeds and disturbing the natural balance of underground aquifers.
Also, air pollution with the operation of asphalt grinding machines, asphalt factories, heavy road construction machines and dust from the traffic of machines and Virtgen machines in addition to damage to the undercarriage and suspension system of cars, all in addition to the consumption of non-renewable resources of fuel and petroleum materials. , bitumen is also created.
It has often happened that the road that was paved and asphalted in one of the working seasons has suffered many cracks and damages in the next year as well, traffic on these roads has faced many problems and should be demolished and renovated from the beginning. to be
It is worth considering that the procedure implemented with the existing standards and after passing the laboratory tests is destroyed and needs to be reconstructed at the beginning of the year, mainly considering the useful life considered in the design and implementation.
The steps including the way of design and operation will also be included in the review, this review will determine that the road design standards include the number of layers, drainage of layers, thickness of layers and materials approved by the resident consultant in the form of mine determination workshops. , also examining the way of operation, including directing surface water and snow removal, dredging and most importantly salt consumption in winter maintenance of roads are important.
If the main reason for the destruction of asphalt pavements in the winter season, especially in mountainous areas, is the use of salt, then it is necessary to think about it, just on snowy days, mountain salt has not been tested and is spread on the asphalt in a large volume. From the influence of hydrochloric acid in it, it will tolerate consecutive freezing and thawing in the coming days along with the loading of vehicle traffic.
Examining road paving issues and problems
Asphalt breakdowns and injuries
In the texts and articles that are mostly presented or written, the road and railway pavements are discussed as a member of the load on the analyzed structure, while most of the time, less attention is paid to the breakdowns of urban roads in research and investigations. be made
Therefore, in this collection and the researches that we will pursue, we will try to analyze the pavement methods of roads and airports, in relation to the behavior of asphalt concrete surfaces and pavement layers of urban roads. We present all kinds of problems and issues in this path.
Every year, millions of tons of asphalt are used on the surface of urban roads for the reconstruction and repair of these roads.
Different types of failures can be divided into two groups:
- A) Fundamental (structural) failures.
- B) Surface (functional) failures.
Fundamental failures occur when the pavement system is damaged due to insufficient bearing capacity due to the incoming loads and can no longer withstand more loading without increasing the failures.
Surface failures occur when the pavement system is not necessarily structurally strong
has lost its bearing capacity, due to the excessive unevenness of the pavement surface, it will be operated with problems.
Diagnosing the type of damage (fundamental-surface) is very important in terms of selecting the type and method of repairing and improving the pavement. To repair the fundamental damage, the pavement system should be from a structural point of view
be strengthened While to repair the surface damage, the surface should be smoothed by taking the necessary measures.
In other breakdowns, failures are divided into four main categories:
1 - Turks.
2- Changing the top surface shapes.
3-Crushing and plucking.
4 - slippery pavement surface
Examining the issues and problems of road paving in Iran
2 - Cracks in the asphalt
2-1-Mosaic crack (lizard skin) in asphaltine, the cracks are also called lizard cracks or snake skin due to their resemblance to the skin on the back of a lizard's body. This type of failure appears with the cracking of all or part of the surface of the asphalt surface in the form of relatively small polygonal pieces, and the extent of the failure is usually increased by repeated loading.
The cause of mosaic cracks is excessive deformation of the pavement layers due to loading, or excessive fatigue of the top layer due to the loads applied to it. Pavements that are built on soils with low resistance and high deformability usually crack in this way.
Also, if the base and sub-base layers do not have the necessary resistance due to insufficient compaction, it may cause mosaic cracks to appear. In cases where mosaic cracks cover all or a large part of the pavement, the cause is usually excessive fatigue of the asphalt surface under the effect of heavy vehicles.
To repair mosaic cracks, if the damage is localized and occurs on a relatively small surface, the damaged part of the pavement must be repaired using a deep patch. If damage is observed in a large area and length of the top surface, the cause of the damage is the insufficient bearing capacity of the pavement, and to strengthen it, an asphalt coating layer with sufficient thickness should be used.
Examining road paving issues and problems
1 - Asphalt breakdowns and injuries
In the texts and articles that are mostly presented or written, the road and railway pavements are discussed as a member of the load on the analyzed structure, while most of the time, less attention is paid to the breakdowns of urban roads in research and investigations. be made
Therefore, in this collection and the researches that we will pursue, we will try to analyze the pavement methods of roads and airports, in relation to the behavior of asphalt concrete surfaces and pavement layers of urban roads. We present all kinds of problems and issues in this path.
Every year, millions of tons of asphalt are used on the surface of urban roads for the reconstruction and repair of these roads.
Different types of failures can be divided into two groups:
- A) Fundamental (structural) failures.
- B) Surface (functional) failures.
Fundamental failures occur when the pavement system is damaged due to insufficient bearing capacity due to the incoming loads and can no longer withstand more loading without increasing the failures.
Surface failures occur when the pavement system is not necessarily structurally strong
has lost its bearing capacity, due to the excessive unevenness of the pavement surface, it will be operated with problems.
Diagnosing the type of damage (fundamental-surface) is very important in terms of selecting the type and method of repairing and improving the pavement. To repair the fundamental damage, the pavement system should be from a structural point of view
be strengthened While to repair the surface damage, the surface should be smoothed by taking the necessary measures.
In other breakdowns, failures are divided into four main categories:
1 - Turks.
2- Changing the top surface shapes.
3-Crushing and plucking.
4 - slippery pavement surface
Examining the issues and problems of road paving in Iran
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