How to repair asphalt driveway

In many cities in the municipal road maintenance work, maintenance personnel are always in the road quality problems or defects only when the beginning of maintenance, but do not realize the significance and necessity of daily preventive maintenance work. In fact, if you can do a good job of daily maintenance of municipal roads, you can effectively prevent and control the road surface damage, thereby reducing the maintenance of the normal operation of the road to the impact of the road to improve the quality of operation and efficiency of the road.

Then in the asphalt pavement maintenance and repair to pay attention to what matters?

Under the premise of ensuring the structural standard of the original pavement, maintaining the original structural strength, according to the construction program to repair the pavement in a planned manner.

Asphalt driveway often remove mud, stones, gravel and other debris, especially with other different kinds of pavement connection, must strengthen the cleaning, prohibit mixing mortar on the road, or concrete and other operations, to avoid pollution, resulting in uneven pavement or anti-skid, is not conducive to driving.

The joints of asphalt driveway is the key to repair and maintenance work, concrete slabs in the joints due to the load and the expansion and contraction of the slab itself is easy to damage, rainwater from the joints penetrate into the grassroots, the stability of the grass-roots level has an impact on the unevenness of the joints, asphalt driveway is the weak point of the joints, is a road repair and maintenance of the work of the most important. Repair and maintenance of asphalt driveway, must be based on the original quality of the pavement, traffic flow, operation function and other aspects of consideration, combined with construction and climate conditions, based on improving the construction program and priority arrangement of large, medium and small repair, to ensure that the construction of the pavement after the road surface is intact.

As the traffic flow of municipal highway is large, the wear and tear of pavement performance declines faster, so it is necessary to carry out periodic maintenance, and real-time information on road conditions, analysis and evaluation to determine the maintenance program. The maintenance cycle of municipal highways in China is generally an annual inspection and evaluation. For some special road sections can be seasonal inspection or semi-annual inspection, according to the actual situation to determine the maintenance cycle law of municipal roads.

1. Municipal road pavement preventive maintenance overview in municipal road maintenance work, in the normal operation of the road or the road surface early disease when maintenance and repair, so as to avoid the road to appear more serious quality of disease, improve the smoothness of the road to ensure that the normal operation of the road to extend the normal service life of the road, this maintenance work is the municipal road pavement preventive maintenance.

Take preventive maintenance work compared to the road surface has serious quality disease has to carry out large-scale repair when the maintenance work to be more simple and convenient, economically feasible. It can be said that the municipal pavement preventive maintenance work is very necessary. The original response to the municipal road maintenance method due to high cost, poor results have been far from meeting the needs of social development. For this reason, the development and implementation of preventive maintenance work must be caused by the municipal road maintenance department's attention.

 

2. Municipal road preventive maintenance of the best period and cycle law

Generally speaking, most of the municipal roads are asphalt driveway, the road cycle can be roughly divided into three stages:

The first stage

Asphalt highway was initially built after the use of the stage, this stage of the asphalt will continue to oxidize or wear with the prolongation of time;

Stage II

The stage when the asphalt highway has been in operation for a period of time and minor gaps or potholes appear on the road surface;

Stage III

On the basis of the second stage, the disease is further developed and lead to the aggravation of the road surface disease stage, the road surface has a larger range of cracks, or even cracking, subsidence, so that the highway road surface can no longer normal traffic vehicles.

As can be seen, in these three stages, the best maintenance time for municipal roads for the first stage, at this time the possible road surface disease "killed in the cradle" in the second stage, the third stage can be avoided, greatly extending the service life of the road.

3. Commonly used municipal road pavement pre-maintenance technology measures

At present, in China's municipal road maintenance work, there are many kinds of maintenance and repair methods for roads. In the actual maintenance work need to choose the most appropriate maintenance technology measures according to the specific road conditions or pavement disease conditions.

Here we will introduce the more common preventive maintenance technical measures:

3-1. Grouting

Due to uneven settlement, construction lap, excessive load, temperature changes and reflection cracks, etc., the pavement is easy to produce different degrees of reflection cracks after a certain period of time; pavement cracking, the road surface water in the high-speed traffic under the action of the pavement cracks penetration repeated erosion of asphalt and the aggregate interface until the breakdown of the surface layer damage to the roadbed. In order to prevent the cracks from expanding to raise the further damage of the grass-roots level, the cracks should be grouted in time.

3-3.Asphalt slurry sealing

It is a new sealing technology which is developed fast at home and abroad in recent years. It can effectively manage the cracks on the pavement, improve the smoothness of the pavement and waterproof, anti-friction, anti-skid ability, has the advantages of fast construction, low cost and energy saving, etc., and mainly improves and restores the surface function of the pavement, especially suitable for preventive maintenance of asphalt driveway.

 

3-4.Regeneration sealing

Under the repeated action of frequent traffic load and temperature expansion and contraction, asphalt driveway will be aging, oil gradually to the gum, carbon transformation, the performance indexes decline, can use asphalt driveway regeneration sealant to paint the pavement, supplement the oil from the asphalt group, restore the activity of aging asphalt, and restore the performance of the pavement.

 

3-5.Asphalt concrete overlay

City roads and highways are different, all kinds of pipes are buried underground, pipe trench due to insufficient compaction, new and old grass-roots level is not a plate body and other reasons, often uneven settlement and other phenomena, resulting in various types of pavement disease. In order to maintain road levelness and elevation, the original pavement can be milled and hooded as needed.

 

3-6.Pavement crack filling and sealing

Cracks in asphalt driveway not only affect the road appearance and driving comfort, but also make the road surface water through the cracks into the structural layer of the pavement, resulting in a decline in the bearing capacity of the pavement, which in turn causes local or piece damage to the pavement, greatly shortening the service life of the pavement. Most of the cracks in asphalt driveway are small cracks at the beginning. For small cracks usually use asphalt binding material or asphalt as the base material of the sealant as a sealing material. The best time to caulk cracks in asphalt driveways is April-May of each year. At this time, the ambient temperature is favorable and the tensile and compressive stresses on the sealing material are not too great.

 

3-7.Pavement local defect repair

Localized pavement defects refer to potholes, embraces, looseness, network cracks, slurry and other localized diseases of the pavement caused by improper design or construction. For pavement localized defects, if not timely maintenance repair, it will cause serious pavement damage. At present, the commonly used pavement repair materials are mainly divided into 2 categories: hot mix asphalt mixture and cold mix asphalt mixture. The construction process of hot mix asphalt as a repair material has a greater impact on the effect of the repair. On the contrary, the construction process has less influence on the repair effect of cold mix materials.

3-8.Surface Sealer Technology

Surface sealing material can be a separate asphalt or other sealing agent, can also be asphalt and aggregate composition of the mixture surface sealing can be used to restore or delay the aging of the surface layer of asphalt material, to prevent the loss of aggregate, to restore the skidding ability of the pavement, sealing the surface of the micro-cracks, to prevent the water seepage into the structural layer of the pavement, and to improve the pavement driving ability.

At present, the commonly used surface sealing technology mainly includes fog sealing layer, thin slurry sealing layer, micro-surface and stone chip sealing layer.

 

In summary, in the municipal road maintenance work, it is necessary to pay attention to the importance of its preventive maintenance work, comprehensive maintenance of highway pavement in the best maintenance period, and summarize a certain maintenance cycle law, regular inspection and evaluation of the road. When choosing the maintenance technology of the road, it is necessary to combine the actual road conditions and the size of the degree of road surface damage to choose, through reasonable and effective maintenance technology to maintain the quality of the road surface, and prolong the service life of municipal roads.