Advantages and disadvantages of asphalt pavement and prevention measures

Asphalt pavement refers to various types of pavement paved with asphalt materials mixed in mineral materials. The asphalt binder improves the ability of the granule used for paving to resist the damage of driving and natural factors on the road surface, so that the road surface is smooth and less dust, impermeable and durable.

Advantage：

Asphalt pavement has high temperature stability

High temperature stability is the ability of asphalt pavement to resist flow deformation. Because the strength and stiffness of asphalt pavement decreases significantly with the increase of temperature, in order to better ensure that the asphalt pavement in the high temperature season under the repeated action of driving load does not produce such as waves, push, rut, cover and other diseases, asphalt pavement should have good high temperature stability.

Asphalt pavement has low temperature crack resistance

Low temperature crack resistance refers to the ability of asphalt pavement to resist low temperature shrinkage cracks. Since the asphalt pavement decreases with temperature, the strength increases and the deformation resistance decreases.

Under the action of external load, part of the stress has no time to relax, and the stress gradually accumulates. When the accumulated stress exceeds the tensile strength of the material, cracking will occur, which will lead to the damage of the pavement. Therefore, the asphalt pavement should have low strength and large deformation resistance to meet the low temperature crack resistance performance.

Asphalt pavement is water stable

Water stability refers to the ability of asphalt pavement to resist the erosion of water and gradually produce asphalt membrane peeling, grain dropping, loose, potholes and damage.

This is because the existence of moisture on the one hand reduces the adhesion of asphalt itself, but also destroys the adhesion between asphalt and ore in the asphalt pavement, thus accelerating the occurrence of spallation phenomenon, resulting in water damage to the road.

Asphalt pavement should have fatigue resistance

Fatigue resistance refers to the ability of asphalt pavement to resist damage under repeated loading. It is due to the asphalt pavement during the use of repeated action of wheel load, long-term stress and strain overlap change state, resulting in a gradual decline in the strength of the pavement structure.

Disadvantages：

The disadvantage of asphalt pavement is its high temperature sensitivity. Summer intensity decreases, if the control is not good, it will make the road soft oil or shear damage emulsified asphalt. Asphalt material becomes brittle at low temperature and may cause pavement cracking.

Control measures for asphalt pavement:

Material aspect

Reasonable determination of asphalt pavement structure, asphalt surface layer cracks are mainly caused by the low temperature shrinkage of the asphalt surface layer itself.

The high quality asphalt with low temperature stiffness, large elongation, poor temperature sensitivity and low wax content is selected, the ore material is selected, the ore material of the asphalt surface layer is accurately graded and the proportion of the asphalt mixture is rationally allocated.

Prepare asphalt mixture with excellent performance, control the amount of asphalt, ensure the excellent performance of asphalt mixture, and effectively reduce cracks.

Design aspect

In the design of semi-rigid pavement, under the premise of meeting the requirements of stability, the asphalt with greater penetration degree is preferred to be used as the asphalt surface.

The asphalt surface layer is made of dense asphalt concrete. The appropriate thickness of the asphalt surface layer is used to ensure that the semi-rigid base layer generally does not produce dry shrinkage cracks and warm shrinkage cracks during use. Elaborate design, do a good job in geological survey of terrain complex areas.

Aspect of maintenance

Strict maintenance management, strengthen road cleaning, ensure good drainage performance. Scientific treatment of cracks in time to avoid further expansion of the disease.