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Function of steel plastic geogrid in highway asphalt maintenance engineering

Function of steel plastic geogrid in highway asphalt maintenance engineering

  • Categories:NEWS
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  • Time of issue:2020-07-13
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(Summary description)Due to the role of reinforced soil cushion, the overall stiffness of the foundation within the scope of compression layer is increased, which is conducive to the adjustment of foundation deformation.

Function of steel plastic geogrid in highway asphalt maintenance engineering

(Summary description)Due to the role of reinforced soil cushion, the overall stiffness of the foundation within the scope of compression layer is increased, which is conducive to the adjustment of foundation deformation.

  • Categories:NEWS
  • Author:
  • Origin:
  • Time of issue:2020-07-13
  • Views:0
Information

Due to the role of reinforced soil cushion, the overall stiffness of the foundation within the scope of compression layer is increased, which is conducive to the adjustment of foundation deformation. The reinforced soil composite cushion formed by using steel plastic geogrid belongs to flexible structure, which can absorb seismic energy and has good seismic performance.

1. The laying surface of geogrid should be relatively flat. After the laying layer is accepted as qualified, in order to prevent longitudinal deflection, white line or hanging line shall be drawn on the laying layer according to the width, and then the end of the grid shall be fixed with U-shaped nails;

2. After fixing the end of the grid, use the laying machine or manual method to slowly pull the grid forward, and conduct manual investigation once every 10m long until one roll of grid is paved, and then lay the next roll. The operation is the same as before;

3. Joint paving: the unit length of laying section is the roll length. After the section length of the grid should be paved, the laying quality should be checked as a whole, and then the next section should be laid. When the next section is laid, the grid and the grid should overlap a net distance as the lap length, and the second section should be paved in the forward direction after being fixed with binding wire. The operation requirements are the same as before.

The function of steel plastic geogrid in highway asphalt maintenance engineering is as follows

1. Reduce cracking

The reflection crack is caused by the displacement of the old highway pavement at the construction gap, which causes the stress concentration inside the asphalt overlay above it. Because the modulus of geogrid is very large, it can restrain the stress and release the strain when it is used as the rigid interlayer in the asphalt overlay. At the same time, as the reinforced material of asphalt mixture, it can improve the tensile strength and shear resistance of the overlay structure, so as to reduce the cracks.

 

2. Anti fatigue cracking

In asphalt overlay, geogrid can disperse compressive stress and tensile stress, and form buffer zone between the two stress areas, where the stress changes gradually instead of mutation, which reduces the damage of asphalt overlay caused by stress mutation. At the same time, the low elongation of the geogrid reduces the deflection of the pavement and ensures that the pavement will not have excessive deformation.

The treatment of Geogrid in preloading subgrade is as follows: the preloading of geogrid is to improve the bearing capacity of soft foundation, reduce the settlement, improve the degree of consolidation of foundation, and impose certain static load on the soft soil foundation in advance to make the foundation soil compact. Preloading is a common treatment method for soft soil foundation, which aims to solve the problem of allowable post construction settlement. It is suitable for general sections with low allowable settlement standard or small embankment height. When the construction period is restricted strictly and the preloading time is short, the method of overload preloading can also be used to preload the settlement. As the preloading or overload preloading load, the embankment material is appropriate. Due to the settlement of the foundation in the process of preloading, the actual filling height of the embankment should be greater than the design height of the embankment. The actual filling height of the embankment should be equal to the sum of the design height of the embankment and the settlement during the preloading period.

 

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