How long does it take for the asphalt pavement to pass the car

The temperature of the initial pressure link is generally maintained between 110 and 140 degrees Celsius. The temperature of the recompression link of the road surface should be kept at 120-130 degrees Celsius. The temperature at the end of the final pressure should be greater than 90 degrees Celsius.

Asphalt spreading temperature should be determined according to the construction temperature and asphalt number, in general, petroleum asphalt should be 130 170, coal asphalt should be 80 120, emulsified asphalt should be dispersed at room temperature. After paving, the rolling process is immediately followed, and the compaction is divided into three stages: initial pressure, double pressure and final pressure (including forming). The rolling temperature is 110 140 during normal construction, and not less than 110; Low temperature construction rolling temperature 120 150.

The final temperature of rolling is not lower than 65 80. Extended informationAsphalt pavement is usually used to pave the surface layer of pavement, which is directly affected by vehicle load and atmospheric factors, and the physical and mechanical properties of asphalt mixture are greatly affected by climatic factors and time factors, so in order to make the pavement provide stable and durable services to vehicles. Asphalt pavement must be required to have the following important characteristics:

1. 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 decrease significantly with the increase of temperature, in order to better ensure that asphalt pavement will not produce diseases such as waves, shifts, ruts, and congestion under the repeated action of driving load in high temperature season, asphalt pavement should have good high temperature stability.

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 temperature, the stiffness increases, and the expansion capacity decreases.

Under the action of external load, so that part of the stress has no time to relax, the stress gradually accumulates, and these accumulated stresses exceed the tensile strength of the material when cracking, which will lead to the destruction of the pavement, so the asphalt pavement should have lower stiffness and greater deformation resistance at low temperature to meet the low temperature crack 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 membrane peeling, granulation, loosening, and potholes.

This is due to the presence of moisture on the one hand to reduce the cohesion of the asphalt itself, but also to destroy the asphalt pavement between the cohesion between the asphalt and the mineral material, thereby accelerating the spalling phenomenon and causing water damage to the road. Therefore, asphalt pavement must have water stability, so as to ensure the durability of the pavement.

The specification has requirements, after the construction of the road surface temperature dropped below 50 ° can be passed, usually after the marking is completed, and after the cooling, the traffic will be opened.

It takes about 3 hours for a small vehicle to be opened, and about 24 hours for a large vehicle. Asphalt pavement is a variety of types of pavement formed by paving and rolling asphalt concrete.

Road engineering refers to the whole process of planning, design, construction, maintenance and management of roads and the engineering entities engaged in them.

Like any other type of civil engineering, road engineering has obvious technical, economic and managerial characteristics.

Maintenance works:

Maintain the intact condition of the road, prevent and repair all kinds of defects and damage in a timely manner, provide and guarantee safe, fast, economical, comfortable driving conditions, improve the technical condition of the road in a planned way, so as to meet the needs of traffic development.

Most countries use trained and equipped road maintenance teams and engineering teams to complete maintenance projects. According to the nature of their work and tasks, maintenance projects are divided into: minor repairs and maintenance. Accident prevention and repair of minor damage to the road and all its facilities.

According to the technical code for the construction of highway asphalt pavement JTGF40-2004, the hot-mix asphalt mixture pavement should be completely naturally cooled by the paving layer, and the surface temperature of the mixture is lower than 50 degrees before it can be opened to traffic. When it is necessary to open traffic early, it can be cooled with water to reduce the temperature of the mixture.

Small vehicles can take about 3 hours, large vehicles need about 24 hours, and the temperature drops below 50 degrees a day and a night.

10 days. Bitumen is a complex mixture of black-brown hydrocarbons and their non-metallic derivatives of different molecular weights, which is a kind of high-viscosity organic liquid, mostly in the form of liquid or semi-solid petroleum, with a black surface and soluble in carbon disulfide and carbon tetrachloride. Asphalt is an organic cementitious material that is waterproof, moisture-proof and anti-corrosion.

Asphalt can be divided into three main types: coal coke asphalt, petroleum asphalt and natural asphalt: among them, coal coke asphalt is a by-product of coking. Petroleum bitumen is the residue after distillation.

Natural bitumen is stored underground, and some form layers or accumulate on the surface of the earth's crust. Asphalt is mainly used in coatings, plastics, rubber and other industries, as well as paving roads.

On October 27, 2017, the World Health Organization's International Agency for Research on Cancer (IARC) published a preliminary list of carcinogens, asphalt, occupational exposure to oxidized asphalt and its emissions in the process of roofing are in the list of Class 2A carcinogens, occupational exposure to straight-run asphalt and its emissions during paving, and occupational exposure to hard asphalt and its emissions when doing asphalt sand glue work are in the list of Class 2B carcinogens.

According to the highway asphalt pavement construction technical specification JTGF40-2004, the hot-mix asphalt mixture pavement should be completely naturally cooled by the paving layer, and the surface temperature of the mixture is lower than 50 degrees before it can be opened to traffic. When it is necessary to open traffic early, it can be cooled with water to reduce the temperature of the mixture.

12 hours later! After the surface temperature drops, you can pass the car!

Legal analysis: If it is a small vehicle, it can be opened to traffic in about 3 hours, and if it is a large vehicle, it will take about 24 hours. Now the asphalt is high-tech synthetic, there are also imported, it has special equipment when laying through high temperature and back and forth heavy pressure and other several processes in one go, so not a few days, generally as long as the weather is good, laid for pedestrians to walk, if it is a motorway, at most paved for about three hours, you can let the car pass normally.

Legal basis: Regulations on the Administration of Urban Roads

17th urban road design, construction, shall be strictly implemented by the State and local provisions of the technical specifications for the design and construction of urban roads.

For urban road construction, the project quality supervision system is implemented.

The urban road project can be delivered only after the completion of the experience and the passing of the experience; If it has not been accepted or the acceptance is unqualified, it shall not be delivered.

Article 21 Units undertaking the maintenance and repair of urban roads shall strictly implement the technical specifications for the maintenance and repair of urban roads, and regularly maintain and repair urban roads to ensure the quality of maintenance and repair projects.

The administrative departments of municipal engineering are responsible for supervising and inspecting the quality of maintenance and repair projects to ensure that urban roads are in good condition.

Article 24 The maintenance and repair of urban roads shall be repaired and completed in accordance with the prescribed time limit, and clear signs and safety prevention facilities shall be set up at the construction site of the maintenance and repair projects to ensure the safety of pedestrians and traffic vehicles.

You can take the way of water cooling, but you can wait for the asphalt material to cool down to about 50 degrees (touch it with your hands, don't feel too hot) before it can be carried out, and it takes about 2 hours of natural cooling time, and the newly paved road surface can be opened to traffic after dropping to room temperature.

Before asphalt pavement construction, the pavement should be sealed, when the formal paving, the surface of the pavement base that passes the acceptance is comprehensively cleaned, and then the floating ash is blown clean with a blower along the longitudinal longitudinal line, and the surface aggregate is exposed as much as possible, so as to facilitate the bonding of asphalt and the base layer, when the surface of the pavement base has been dried, a small amount of water is quickly sprayed with a sprinkler truck one hour before spraying the modified emulsified asphalt to wet the surface of the pavement base layer.

There is no moisture in asphalt and generally does not dry. Generally speaking, it is cooled, and you can leave at about 50 degrees.

It depends on the local situation. Yes, cooling.

When the temperature is lowered below 50 degrees, you can drive, and the driving can also play a compaction role. The asphalt pavement of many rural roads is constructed in this way, and the impact on traffic is minimized.

After asphalt concrete paving construction, the temperature is lower than 50 and the car can be passed.

Hot-mix epoxy asphalt paving is required for days after construction.

Cold-mix epoxy asphalt needs to be cured for hours after construction.

The temperature is lower than 50 can pass the car, and the asphalt pavement construction technical specifications are above.