Why do some roads use cement and some use asphalt What is the difference between these two materials

1.The type of materials and structures used in the construction of roads depends mainly on the grade of the road built, its function and the transport tasks undertaken in the overall road network.

2.Generally, the roads that use asphalt concrete or cement concrete pavement belong to high-grade roads, and of course, urban roads also use a large number of these two materials.

3.One of the obvious differences between the two materials is the construction conditions, asphalt paving requires a certain amount of energy due to heating, while cement concrete does not.

4.Then the comfort of the vehicle driving on it is also different, the asphalt pavement is better than the cement pavement, which can be experienced from the noise generated by the vehicle when driving, if you can drive or take a car to feel it, in addition, the cement pavement bears traffic load strength is better than the asphalt pavement.

5.But its maintenance is more difficult, and the maintenance or new road needs a certain time to open up traffic, of course, there are many other differences, in our country has been built highway pavement, more than 90 is semi-rigid base asphalt pavement.

6.The difference between asphalt pavement and cement pavement.

Good flatness, smooth and comfortable driving, low noise.

The asphalt semi-rigid base has the characteristics of high strength, good stability and high stiffness.

The cement road belongs to the rigid ground, there must be joints, the construction is more difficult, and the thermal expansion and contraction are also easy to produce cracks.

The asphalt is used for fast construction and easy maintenance.

It may be determined by the topography. Cement roads do not have the long life of asphalt roads, and of course the cost of asphalt roads is also high. The general long-distance roads such as the inter-provincial ones use asphalt, and the short-distance roads are mostly cement roads.

This is because the pavement grade is different. Pavement grades are classified as high, sub-high, intermediate, and low according to the type of surface layer.

Advanced: Asphalt concrete pavement or cement concrete pavement.

Sub-level: asphalt penetration or pavement-type asphalt gravel pavement.

Intermediate: Sand and gravel pavement.

Low: Mud, gravel or dirt roads.

We don't need professional knowledge to directly see that the higher the level of the road, the stronger its carrying capacity, and the kind of mountain trails that are not advanced can only be used for mountaineering or hiking.

In China's highway pavement has been built, more than 90 is semi-rigid base asphalt pavement 1, good flatness, smooth and comfortable driving, low noise 2, asphalt semi-rigid base has the characteristics of high strength, good stability and stiffness 3, cement road belongs to the rigid ground, there must be joints, construction difficulty is relatively large, thermal expansion and contraction are also easy to produce cracks. 4. The asphalt construction is fast and the maintenance is also convenient.

Asphalt pavement refers to various types of pavement paved with asphalt materials mixed with mineral materials. Asphalt binder improves the ability of paving pellets to resist road damage to the road surface caused by driving and natural factors, making the road surface smooth and dusty, impermeable and durable. Therefore, asphalt pavement is one of the most widely used high-grade pavements in road construction.

The asphalt structure layer of asphalt pavement itself belongs to the category of flexible pavement, but its base layer can also use rigid cement concrete or semi-rigid hydraulic material in addition to flexible materials.

Features of cement concrete pavement.

Cement concrete pavement is a pavement structure with large stiffness, strong diffusion load stress capacity, good stability and long service life, it has the following characteristics compared with other pavement:

Merit. 1) High strength.

2) Good stability.

3) Good durability.

4) Low maintenance cost.

5) Good anti-slip performance.

6) It is conducive to night driving.

Advantages of asphalt roads:

1. Asphalt pavement.

It is stable at high temperatures.

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 such as waves, shifts and ruts under the repeated action of driving load in the 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 drops with temperature, the stiffness.

Increase, decrease in swelling capacity. Under the action of external loads, some of the stresses do not have time to relax, and the stresses gradually accumulate, and these accumulated stresses exceed the tensile strength of the material.

Cracking will occur from time to time, which will lead to the destruction of the pavement, so the asphalt pavement should have low 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.

Disadvantages of asphalt roads:

1. Asphalt is easy to age, and the dark color of the pavement is easy to absorb heat and produce a certain degree of dissolution.

1. The differences are roughly as follows:

1. The cement concrete pavement is a rigid pavement, and the asphalt pavement is a flexible pavement.

2. The cement concrete pavement is noisy when driving, and the asphalt pavement is less noisy.

3. The construction speed of cement concrete pavement is slow, and the construction speed of asphalt concrete pavement is fast.

4. The maintenance of cement concrete pavement is inconvenient (because cement concrete needs to reach a certain maintenance time), and the maintenance of asphalt pavement is convenient and easy, and it can be opened to traffic after construction.

5. In terms of service life, cement concrete pavement is generally higher than asphalt pavement (depending on the form).

Second, the cost: generally if it is not a reinforced concrete pavement, then the cost of simple cement concrete pavement is lower, probably the cost of asphalt pavement depends on the road grade and structural form).

In addition, cement or asphalt composite pavements are more expensive.

1. The surface layer is different. Asphalt roads are also called asphalt roads, and their base structure is consistent with cement roads (also called reinforced concrete roads), and asphalt roads are different in that they are paved with asphalt concrete.

2. The materials are different. The materials of asphalt road include graded granules, gravel gradation, asphalt cement, bone, stone powder, etc. The materials of the cement road are cement, sand, gravel, water.

3. The hardness of the pavement surface layer is different. The asphalt pavement layer is relatively soft, so the car will feel comfortable walking on it, with a certain degree of elasticity. The hardness of the cement pavement layer is large, and the car will feel hard when walking on it, and some small defects of the pavement will give people a strong vibration feeling.

4. The landscape is different. The asphalt road is generally black, giving people a deep and stable feeling, and people will feel more solid when driving. The color of the cement pavement is gray-white, and there is no landscape at all.

Therefore, when designing the main roads and secondary roads of the community or municipal, if you want to go up the grade, you should choose asphalt pavement.

5. The asphalt of the asphalt road is liquid, and the dark color of the road surface is easy to absorb heat, and it will dissolve to a certain extent, so it will melt a little in high temperature weather, and if it is damaged, it needs to be repaired in time. The cement road is a relatively solid stone road, which is a rigid pavement and has a longer life of self-use.

1. Cement pavement.

Advantages: 1) High strength.

2) Good stability.

3) Good durability.

4) Low maintenance cost.

5) Good anti-slip performance.

6) It is conducive to night driving.

Disadvantages: 1) The demand for cement and water is large, and the construction of 20cm thick and 7m wide cement concrete pavement requires 400 500 tons of cement and about 250 tons of water per kilometer.

2) There are more seams.

3) Late opening of traffic.

4) Difficulty in maintenance and repair.

2. Asphalt pavement.

Advantages: smooth surface, no joints, comfortable driving, low vibration, low noise, wear-resistant, dust-free and easy to clean, short construction period, simple and renewable maintenance and repair, suitable for phased construction, etc.

Disadvantages: Asphalt material has poor temperature stability, is easy to be brittle in winter and easy to soften in summer; The compacted mixture has large porosity, poor water resistance, and is prone to water damage; Asphalt is a polymer material, with poor aging resistance and durability that is not easy to guarantee; The flatness is poorly retained, not only the flatness deteriorates due to settlement, but also the material is easy to form ruts when it softens.

Cement pavement is being replaced by asphalt because asphalt is cheaper and more practical.

Cement pavement is being replaced by asphalt, and the highway is no longer allowed to use concrete, all asphalt is used, paved with asphalt. The main reason for this is that asphalt is cheaper and paved with pavement is more practical. Now asphalt material paved highway all use mechanized operation, do not need to invest too much labor cost paved asphalt pavement can be quickly cooled and put into use as soon as possible, this material is not high, practicability is particularly strong, can save the cost of paving.

When using cement to pave the pavement, it is necessary to invest a lot of manpower and wiring equipment, and the cost of a number of preparatory work such as mixing and mixing should be carried out before laying the cement will be much higher, and the pavement of the cement paving is particularly slow, and often leaves marks, affecting his appearance, and in the process of his drying, it will also affect the normal passage of the road, which will have a negative impact on traffic.

The maintenance of asphalt pavement is more convenient, and it is also the main reason why cement pavement is replaced by asphalt because the pavement compressive capacity of cement repair is relatively poor, and it is easy to deform and fracture after a period of use, and it needs to be maintained and hardened regularly, which will have a bad impact on local traffic, and will spend a lot of money, waste a lot of manpower, and will increase the cost of road repair in disguise, and repair the pavement is necessary to dismantle the whole pavement and re-irrigate, which will increase the workload.

Asphalt pavement also has a certain flexibility, which is also the main reason why he replaces the cement pavement, he will not be as hard as the cement pavement, and it is not easy to crack, if the asphalt pavement is damaged, only need to make a patch in the damaged place, so that the pavement can be used normally, will not affect the normal passage of vehicles. The safety of asphalt pavement is better, because the cement pavement is very smooth, and it is easy to let the wheels slip and cause traffic accidents after rain, while the asphalt paved pavement has a certain degree of friction, and even after the rain, there will be no slippage, which can ensure driving safety.

Asphalt is now used instead of concrete in the construction of roads in many places! It is not only the best affordability of asphalt, but also the asphalt road can reduce the discomfort of driving on the way of people, especially on the highway, if the distance is far away but more comfortable, people's mood will also increase with the comfort of the body.

Some friends living in rural areas can see a phenomenon, that is, the country used to use concrete when building roads, but now most of them use asphalt as raw materials, this is because the open cycle of concrete is too long, if we use concrete to build roads, we need to wait until the concrete is dry, generally need to wait for about a month, during this period to do a good job of concrete maintenance, otherwise it will affect the use of roads later! And the concrete leads to poor driving comfort, in order to avoid thermal expansion and cold contraction, we need to divide the concrete into pieces, which will lead to a crack in the road surface, the tire noise is too large when driving, and the comfort is not good! <>

The maintenance of concrete is more difficult, if the concrete is destroyed, it is necessary to replace a whole concrete, the operation process is very troublesome, not to mention the difficulty coefficient is also relatively large, and in contrast to the asphalt is not as long as the open cycle of concrete, there is an old saying that "if you want to be rich, first build a road" The ability level of road repair also represents the economic level development of this region, just like a lot of deep mountains in the place, there is not enough money to build roads, it can be seen that the area is still relatively poor and backward! <>

Asphalt pavement belongs to the elastic pavement, mainly cause ruts, cracks, water damage, etc., the degree of damage is relatively light, if you want to engage in a large-scale renovation will have a very small impact on traffic, you can be like a patch piece by piece, asphalt pavement can be repaired and used, traffic jam will be shorter, resulting in economic losses will be minimized, in general, the benefits of asphalt pavement are far greater than it! <>

Choosing more than 10 times the asphalt road as the road surface of the highway is actually considered in many aspects. The alternation of cement pavement and asphalt pavement also represents the development and changes of our country over the years Asphalt pavement does not need to consider joint crack prevention, but asphalt pavement will cause pollution to the land and groundwater around the highway, and the natural decomposition and degradation of asphalt will take decades, and the cost of asphalt pavement is more expensive than cement pavement. Asphalt pavement is more convenient to maintain than cement pavement and opens to traffic faster, but its maintenance cost is high.

At the same level of flatness, asphalt pavement is more comfortable than cement pavement, and cement pavement operation is more economical than asphalt pavement. The ** of the asphalt is very high.

Yes. Asphalt pavement is more practical, can better reduce noise, and is more durable and very strong.