What is the role of tar sand between the road base and the surface course?

In layman's terms, it is a mixture of sand and asphalt that can be used to fill the cracks in the road surface and the cushion of the oil tank.

Affected by traditional habits, when building large storage tanks, it is always necessary to lay a layer of asphalt sand under the bottom plate of the storage tank to prevent the upper leaching of groundwater, so as to achieve the purpose of slowing down the corrosion of the tank floor. But facts have proved that by the change of the storage tank crossing position and the deformation of the storage tank floor, the asphalt sand layer will soon crack, pulverize, can not achieve the purpose of preventing groundwater, in addition, after the moist air enters the gap between the storage tank floor and the asphalt sand, due to the influence of temperature change, there will also be water analysis, condensation, cause the corrosion of the storage tank floor. For storage tanks with cathodic protection, the presence of tar sands hinders the flow of cathodic protection current and affects the cathodic protection effect of the bottom wrench of the tank.

The 2 cm thick asphalt sand is paved at high temperature by using the asphalt sand to make the clay layer oil spread at the bottom layer work together with stone chips and tar sand, so that the bridge deck is closely connected with the paving layer, and plays the role of dense and waterproof on the bridge deck. 3 Bridge deck.

That layer of sand is called slurry sealing layer, the main role is to have better wear resistance, waterproofness, and better adhesion to the lower layer, which can prolong the service life of the road and reduce its comprehensive maintenance cost!! The construction speed is faster, the impact on traffic is smaller, the operation is at room temperature, clean and environmentally friendly!!

Summary. Dear, hello, I am glad to answer for you: try to describe the role of asphalt pavement base, according to the material and mechanical properties A:

According to the material and mechanical properties, the role of the asphalt pavement base is as follows: 1. It plays the role of a continuous and evenly supported elastic foundation to make the pavement slab reliably supported. The pavement greatly diffuses the load through the thicker rigid pavement slab, so the load distributed in the base layer is small, but the pavement slab is a brittle material, the deformation adaptability is poor, and the flexural tensile strength is relatively small.

2. The water stability of the base layer is good (good permeability). There are many longitudinal and transverse joints in the pavement slabs, and the surface water is easy to seep in after the material at the joints is aged and falls off. The grassroots mainly has the following functions:

1. Bear the driving load, as the main load-bearing layer of the road and the surface layer, the load of the wheel is transmitted to the structure of the lower layer. 2. It increases the overall strength of the road and the fatigue resistance of the surface layer, and prevents or alleviates the appearance of cracks in the surface layer. 3. It can alleviate the adverse effects of uneven frost heave or uneven volume deformation of soil foundation on the surface layer.

4. Provide stable driving surface and working surface for surface construction machinery. The basic requirements of the base layer: 1. Have sufficient strength and rigidity.

2. Sufficient water stability and frost resistance 3. Sufficient flatness. 4. The base layer should be well combined with the surface layer.

The role of the asphalt pavement base layer is described, according to the material and mechanical properties.

Hello, I have seen your question and am sorting out the answer, please wait a while Oh Dear, hello, I am happy to answer for you: try to describe the role of asphalt pavement base, according to the material and mechanical properties A: According to the material and mechanical properties, the role of asphalt pavement base is as follows:

1. Play the role of continuous and evenly supported elastic foundation, so that the pavement slab can be reliably supported. The pavement greatly diffuses the load through the thicker rigid pavement slab, so the load distributed in the base layer is small, but the pavement slab is a brittle material, the deformation adaptability is poor, and the bending tensile strength disturbance is relatively small. 2. The water stability of the base layer is good (good permeability).

There are many vertical and horizontal pure open joints in the road slab, and the surface water is easy to seep into the joints after the material is aged and falls off. The base layer mainly has the following functions: 1. Bear the driving load, as the main load-bearing layer of the road and the surface layer together to transmit the load of the wheel to the structure of the lower layer.

2. It increases the overall strength of the road and the fatigue resistance of the surface layer, and prevents or alleviates the appearance of cracks in the surface layer. 3. It can alleviate the adverse effects of uneven frost heave or uneven volume deformation of soil foundation on the surface layer. 4. Provide stable driving surface and working surface for surface construction machinery.

The basic requirements of the base layer: 1. Have sufficient strength and rigidity. 2. Sufficient water stability and frost resistance 3. Sufficient flatness.

4. The base layer should be well combined with the surface layer.

The main role of asphalt pavement base is: mainly load-bearing.

Analysis: The main role of the asphalt pavement base assessed in this question. The asphalt surface course is a structural layer that directly bears the repeated action of wheel load and the influence of natural factors; The level at which the base level plays a major load-bearing role.

Pavement base: It is a layered structure that is paved in layers with a single material or mixed material on the surface of the roadbed (cushion) according to certain technical measures, and is divided into upper base and lower base. The base can be divided into a stable base with binders (semi-rigid base layers) and granular base without binders, and the subbase can be divided into stable inorganic binders and granules without binders.

Types of pavement bases:

1. Material composition - cement stabilized, lime fly ash stabilized, cement concrete, asphalt stabilized, unbound granules;

2. Mechanical behavior - semi-rigid, flexible, rigid;

3. Structural composition - skeleton dense structure, skeleton pore state shed gap structure, suspended dense junction and state structure, uniform dense structure.

4. The structural strength requirements of the base layer: it means that under the action of driving load, there will be no residual deformation, and shear failure and bending and tensile failure are not allowed.

Stability of base structure: Hydraulic stability mainly refers to the performance of small changes in the strength of the base layer when affected by surface water infiltration and groundwater. Temperature stability refers to the volume change characteristics of the base structure such as expansion or contraction when the ambient temperature rises or falls.

Answer]: B2021 2020 Teaching Pants Bucket Which Material Hu Code P77 2019 Textbook P72

The base layer is set under the surface layer, and together with the surface layer, the reverse pin and tremor of the wheel load is transmitted to the bottom layer, cushion and soil foundation, and plays the main load-bearing role.

Answer]: B pavement base is set under the surface layer, and together with the surface layer, the repeated action of the wheel load is spread to the base layer, cushion layer, soil foundation, and plays the main load-bearing role.

Answer]: B This question examines the composition of asphalt pavement structure. The surface layer is a structural chain return layer that directly bears the repeated hunger removal effect of the load of the car hungry wheel and the influence of natural factors, and can be composed of 1 3 layers. The level at which the base level plays a major load-bearing role.

The role of the asphalt pavement base layer is described, according to the material and mechanical properties.

Dear, I am glad to answer for you: asphalt pavement is often used as a binder with rubber or polymer modified asphalt to pave an open-graded anti-slip surface layer. The thickness of asphalt pavement has the tendency to develop to thick layer, and some thickness reaches more than 30cm.

To reduce reflection cracks, they use asphalt-coated polypropylene fabric to cover the base layer as an insulating layer. With the increase of traffic volume, the thickness of cement pavement is also increasing, and the thickness of Chang Chun is up to 28 30cm. Part of the panel section structure adopts a trapezoidal section with thin inner side and thick outer side.

In order to adapt to the characteristics of fast running speed of automobile on the highway, the direction of the drawing of its road surface is parallel to the direction of the route. In order to alleviate the driving bumps and the pushing effect of the panel expansion in summer, the shrinkage joint is pressed0m unequal spacing is arranged, and it is at a 70° 80° bevel angle with the centerline.

Highways or airports should be made of lean cement concrete or economic cement concrete. Features of asphalt concrete: waterproof, wear-resistant, noise-reducing waterproof:

Prevent the pavement water from entering the roadbed to cause frost heave, loss and other anti-skidding: prevent the road pants from being too smooth, causing inconvenience of driving braking, and preventing deformation in traffic accidents: using the plasticity of asphalt, it can withstand volcanic when the roadbed is deformed, and it can not damage the road surface within a certain range to ensure the possibility of use.