Asphalt pavement refers to various types of pavement paved with asphalt materials mixed with mineral materials. Asphalt bond improves the ability of pavement material to resist the damage of driving and natural factors to the road surface, so that the road surface is smooth, less dust, impervious and durable.
Advantages of Asphalt Pavement
1. Asphalt pavement has high temperature stability
Asphalt is produced by a stationary asphalt mixing plant or mobile plant, and then paved by asphalt laying equipment. High temperature stability is the ability of asphalt pavement to resist flow deformation. Since the strength and stiffness of asphalt pavement decrease significantly with the increase of temperature, asphalt pavement should have good high temperature stability in order to better ensure that the asphalt pavement will not produce diseases such as wave, push, rutting, hugging and other diseases under the repeated action of driving load in high temperature season.
2. Asphalt pavement has low temperature crack resistance
Low temperature crack resistance refers to the ability of asphalt pavement to resist low temperature shrinkage cracks. As the asphalt pavement decreases with the temperature, the strength increases and the deformation resistance decreases. Under the action of external loads, part of the stress is too late to relax, and the stress gradually accumulates. When the cumulative stress exceeds the tensile strength of the material, the cracking occurs, which will lead to the destruction of the pavement. Therefore, the asphalt pavement should have lower strength and greater deformation resistance to meet the low temperature cracking resistance.
3. Asphalt pavement has water stability
Water stability refers to the ability of asphalt pavement to resist the erosion of water and gradually produce asphalt film stripping, dropping grain, loose, pit and damage. This is because the existence of water on the one hand reduces the adhesive force of the asphalt itself, but also destroys the adhesive force between the asphalt and the mineral in the asphalt pavement, thus accelerating the occurrence of spalling phenomenon, resulting in water damage on the road.
4. Asphalt pavement should have fatigue resistance
Fatigue resistance refers to the ability of asphalt pavement to resist damage under repeated loads. It is because the asphalt pavement is subjected to the repeated action of the wheel load during use, and is in the state of stress and strain overlapping for a long time, resulting in the gradual decline of the structural strength of the pavement.
Disadvantages of Asphalt Pavement
The disadvantage of asphalt pavement is high temperature sensitivity. The strength decreases in summer, and if it is not controlled well, it will make the pavement soft and oily or destroy the emulsified asphalt by pushing shear cracking. Asphalt mixture becomes brittle at low temperature, which may cause pavement cracking.
Prevention Measures of Asphalt Pavement
Material aspect
Reasonable determination of asphalt pavement structure, asphalt surface cracks are mainly caused by the low temperature shrinkage of asphalt surface itself. Select the high quality asphalt with low temperature stiffness, high ductility, low temperature sensitivity and low wax content, select the mineral material, accurately grade the mineral material of the asphalt surface layer and rationally allocate the mixture ratio of asphalt. The crack can be reduced effectively by preparing the asphalt mixture with good performance, controlling the amount of asphalt and ensuring the good performance of the asphalt mixture. Visit Lutonmachinery to find how to produce high asphalt by asphalt mixing technology.
Design aspect
In the design of semi-rigid pavement, under the premise that the stability meets the requirements, the asphalt with large penetration degree is preferred as the asphalt surface. The asphalt surface layer is made of dense asphalt concrete. The use of appropriate asphalt surface thickness to ensure that the semi-rigid base generally does not produce dry shrinkage cracks and temperature shrinkage cracks during use. Elaborate design, the terrain of complex areas to do geological survey work.
Maintenance aspect
Strict maintenance management, strengthen road cleaning, ensure good drainage performance. Timely scientific treatment of cracks to avoid further expansion of diseases.