Why does the state ban the use of concrete to build highways?

Why does the state ban the use of concrete to build highways? It turns out that the reason is so simple.

To get rich first build roads, this is the slogan shouted at the beginning of China's development, now China's transportation network extends in all directions, there are highways everywhere, and it is very convenient to go to the first place. On some national highways and provincial highways, concrete is commonly used for paving, but now the state prohibits the use of concrete when building highways, why is this?

The highway is very important to us, and now there are more people with cars, and if we are driving in the city, we will definitely get stuck in traffic. Therefore, when they go out, they can choose the highway, battery cars, bicycles, and pedestrians are not allowed to get on the highway, which has speed requirements, and they cannot park casually, so the congestion is greatly reduced. However, I don't know if you have noticed it, but the first highway was made of concrete, but now it is all asphalt.

This is because the country has banned the use of concrete to build highways, why is that? <

Nowadays, China's highways are generally paved with asphalt, and the state stipulates that concrete cannot be used. This is because the concrete is laid for a long time, and there will be cracks on the road surface after a long period of wind and sun, and if you want to complete the repair, you have to knock out the entire section of the road surface, which is too costly. There is a lot of traffic on the highway, and there are many large trucks passing through, and if all of them are concrete, it is estimated that the high-speed maintenance team will not be able to rest for a few days throughout the year.

But asphalt is different, asphalt is very flexible, and the more pressure it is subjected to, the stronger it will become. And asphalt has a stronger pressure-bearing capacity and is more suitable for highways. In addition, the asphalt pavement is not easy to dust, which is often experienced by car owners who often run at high speeds, and the wheels will feel more suitable when running on the road.

The highway is a national project, we must choose the most cost-effective and safest materials, asphalt pavement also needs to be maintained, but the difficulty is lower than concrete, ** if there is a problem on a separate **, there is no need for a whole section of road surface to be rebuilt. The color of the asphalt should be more profound, giving people a more comfortable and advanced visual experience, in addition to the highway in our country, there is also a runway that can be used for aircraft to take off and land temporarily, it has higher requirements for the material, and the concrete can not withstand such pressure. Therefore, asphalt pavement will not only be used on highways in the future, but will gradually spread to more places.

Because concrete is prone to dry cracking, it is not only expensive but also risky to build highways, so asphalt is not used for concrete construction.

Because of the hard texture of concrete, it is certain to die in the event of a traffic accident, and it cannot be mixed with soil, so it is unstable and prone to collapse.

Now every family has a car. It is also common to travel by car with your family during the holidays.

During a road trip, friends may find that, in fact, we drive on a different road every day. Especially after getting on the highway, one will find that all the roads are paved with asphalt. There are almost no concrete highways. What's going on?

First, let's look at the roads that these two materials are made of.

What are their characteristics? Concrete roads, in general, are relatively difficult. If the car is driving on it, the friend who drives it obviously feels a little bumpy

In addition, cement roads often raise dust. Thousands of cars pass by here every day. Over time, this will result in some potholes or cracks in the concrete pavement.

But concrete roads are difficult to repair.

Not only does it consume a lot of money and manpower, but it also takes a relatively long time to maintain. Usually after the road is damaged, this takes a few days. This bad place was sealed off and repaired.

But the asphalt-paved road, not only is the pressure resistance very good, the car does not feel bumps when driving on it. The drive is very smooth. In addition, the asphalt itself does not produce dust, therefore, the cleanliness of the road can be greatly improved.

At the same time, it will also reduce the huge burden on the cleaners. Asphalt is a great repair material. Once the damage is discovered, only a few people need to be sent.

Just patch it with new asphalt. Suffice it to say, this can be done in a very short time。As a result of all these advantages, more and more highways are now being built with this material.

The country has gradually banned the use of concrete in the construction of roads. It turns out that the reason is simple.

Highway can be said to be a very convenient facility in our life, it can allow us to get to a place faster, and avoid various unfavorable traffic factors such as traffic jams and poor road conditions. Although many highways now have tolls.

That's because of the high speed, and if you use concrete, there is a high risk of cracking due to thermal expansion and contraction.

Because it is not cost-effective to use this on the highway, the friction is relatively large, and the resistance is high.

This is mainly because the highway must be very good, so naturally it can't be used.

Because the safety factor of concrete is still not enough to meet the use of highways.

Now the traffic is more and more convenient, in order to prevent faster arrival at the destination, the country began to build highways, avoid the city, prevent a series of problems such as traffic congestion, save a lot of time, the efficiency is greatly improved, but if you get on the highway you need to pay the fee, the time of the holiday time is not charged, in general it is convenient and save money. Most of the highways we used to walk on were made of concrete, but now asphalt pavements are common. So why does the state not allow the use of concrete, and what is the reason?

We came back to popularize the knowledge, and learned from the master of learning construction that concrete is a not so strong material, can not withstand the wind and rain, and a series of problems such as cracks will occur after a long time, it needs to be repaired, and a maintenance will cause traffic congestion to bring great inconvenience to people, and it is very troublesome to repair, we have seen the road repair, it takes about half a year to repair, and it will also cost a lot of money and manpower and material resources, and many aspects of consideration will give up the use of concrete. Now the more commonly used material is asphalt, which solves the problem of many cracks in concrete, this material is relatively soft, so its flexibility is better, and the compression color resistance is relatively strong.

Another point is that the construction of highways now belongs to the state, of course, the country will choose some better cost-effective materials, the asphalt pavement is forced to lay concrete for a shorter time, and the time is greatly saved, and once the asphalt pavement is worn, it is convenient and time-saving to repair, and the dust generated by the asphalt is smaller, and to a certain extent, it is also more environmentally friendly.

The country is constantly developing, and will continue to innovate on the basis of the original, asphalt is a major innovation discovery in concrete, find a more suitable thing to replace the current thing, this is also the law of survival, it is for these reasons that concrete will be eliminated, and asphalt to a large extent more advantages than concrete.

Cement pavement has little friction and is easy to slip, especially after rain. Cement pavement is easy to be damaged, especially for over-heavy vehicles, which is easy to be crushed and cracked, and the later maintenance is troublesome and the maintenance time is long.

Concrete is a fragile material, can not withstand a large number of vehicles on the highway back and forth, need to be repaired frequently, so the high-speed maintenance cost will be very high, the cost of cost is too low.

The concrete pavement is easy to be damaged, and the pavement is easily affected by the weather, which is easy to accumulate water, inconvenient for cars to drive, and easy to cause accidents.

First, the concrete pavement takes a long time to build. Second, concrete pavement is easily damaged. Thirdly, concrete pavement is susceptible to weather.

Why does the country use asphalt instead of concrete when building highways? The reason is simple.

First of all, compared with the construction of roads, not only have to suffer from extreme loads in different conditions, but also have to withstand the corrosion of the external environment such as wind and sun, and the construction requirements will be higher.

Due to the general substandard quality of road construction in China, the phenomenon of cutting corners is too common, and the construction period is too short, resulting in the phenomenon of concrete highway, which is far lower than the design life.

Secondly, compared with concrete pavement, asphalt pavement has many advantages, such as having sufficient mechanical properties, being able to load vehicles with different loads, having higher elastic and plastic deformation capabilities, and being able to adapt to various load-bearing forces without being damaged.

The friction coefficient is larger than that of concrete pavement, which can improve the grip of car tires, further ensure the safety of driving, and have a certain shock absorption function that can make the car run quickly and smoothly.

Asphalt pavement.

Pros:1Sufficient mechanical properties to withstand various forces exerted on the road surface by vehicle loads;

2.A certain elastic and plastic deformation ability, which can withstand strain without damage;

3.The adhesion to the automobile tire is better [the friction coefficient is larger than that of the concrete slab], which can ensure the safety of driving;

4.It has a high degree of shock absorption, which can make the car drive quickly, and why is the noise of asphalt pavement less than that of cement pavement? -Pavement;

5.No dust, and easy to sweep and clean;

6.The maintenance work is relatively simple, and the asphalt pavement is recyclable; Later maintenance is simple, and partial reconstruction can be carried out without large-scale construction like concrete pavement, and the maintenance cost is low.

7.Strong adaptability to roadbed, foundation deformation or uneven settlement;

Cons: 1Crack due to the serious overload of the vehicle, resulting in tensile stress exceeding its fatigue strength and breaking, or asphalt surface course shrinkage, in winter, the average temperature in the asphalt surface course is lower than the fracture temperature, the surface course will break.

2.Rutting is very common, in the season of higher temperature, repeated rolling of vehicles, asphalt produces plastic flow formation, ruts reach a certain depth, rut grooves accumulate water, prone to accidents.

3.Loose spalling Asphalt peels off the surface of the material.

4.Surface polishing The wheel is repeatedly rolled and rubbed, and the surface of the aggregate is polished, resulting in a smooth surface of the asphalt surface layer, which is easy to cause car accidents in the rainy season [there are many kinds of asphalt pavement, such as OGFC, and the road surface has good drainage performance].

5.Water damage [This is actually the most terrible in reality, after all, ruts leave wheel prints, and they are not deep]. Now the norms are paying more and more attention to water stability.

6.Waves, potholes, gnawing edges, etc.

Ordinary concrete pavement [reinforced concrete pavement is too reinforcing steel, expensive, generally rarely used in road sections, continuous reinforcement is more expensive].

Pros:1High strength High compressive strength and flexural tensile strength, anti-wear capacity, better than asphalt pavement for heavy-duty traffic.

2.Good stability The strength gradually increases with the extension of time, and there will be no "aging" phenomenon of asphalt pavement.

Why does the state prohibit the construction of highways with reinforced concrete? After reading it, I understood the intention.