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Geogrid uses high-strength polyester fiber or polypropylene fiber as raw material, and adopts warp knitting oriented structure. The warp and weft yarns in the fabric are free of bending, and the intersection is bound with high-strength fiber filament to form a firm joint, giving full play to its mechanical properties. Do you know how good its fatigue crack resistance is?
The main effect of asphalt overlay on the old cement concrete pavement is to improve the application function of the pavement, but it does not contribute much to the bearing effect. The rigid concrete pavement under the overlay still plays a vital role in bearing. The asphalt overlay on the old asphalt concrete pavement is different. The asphalt overlay will bear the load together with the old asphalt concrete pavement. Therefore, asphalt overlay on asphalt concrete pavement will not only present reflection cracks, but also fatigue cracks due to the long-term effect of load. Let’s analyze the stress of the asphalt overlay on the old asphalt concrete pavement: because the asphalt overlay is a flexible pavement with the same nature as the asphalt overlay, the road surface will deflect when subjected to the load effect. The asphalt overlay directly touching the wheel is under pressure, and the surface is subject to tension in the area beyond the wheel load margin. Because the force properties of the two stress areas are different and close to each other, the junction of the two stress areas, that is, the sudden change of force, is easy to be damaged. Under the effect of long-term load, fatigue cracking occurs.
In the asphalt overlay, the geotextile can loosen the above compressive stress and tensile stress, and form a buffer zone between the two stress bearing areas. Here, the stress changes gradually rather than suddenly, reducing the damage to the asphalt overlay caused by the sudden stress change. The low elongation of the glass fiber geogrid reduces the deflection of the pavement and ensures that the pavement will not suffer from transition deformation.
Unidirectional geogrid is extruded into thin sheets by polymer (polypropylene PP or polyethylene HDPE), and then punched into regular mesh, and then stretched longitudinally. In this process, the polymer is in a linear state, forming a long oval network structure with uniform distribution and high node strength.
The unidirectional grid is a kind of high-strength geosynthetics, which can be divided into unidirectional polypropylene grid and unidirectional polyethylene grid.
Uniaxial tensile geogrid is a kind of high-strength geotextile with high molecular polymer as the main raw material, added with certain anti ultraviolet and anti-aging agents. After unidirectional stretching, the original distributed chain molecules are reoriented to a linear state, and then extruded into a thin plate, impacting the conventional mesh, and then stretched longitudinally. Material Science.
In this process, the polymer is guided by the linear state, forming a long elliptical network structure with uniform distribution and high node strength. This structure has very high tensile strength and tensile modulus. The tensile strength is 100-200Mpa, close to the level of low carbon steel, which is much better than traditional or existing reinforcement materials.
In particular, this product has an ultra-high early international level (elongation of 2% – 5%) tensile strength and tensile modulus. It provides an ideal system for soil commitment and diffusion. This product has high tensile strength (>150Mpa) and is applicable to various soils. It is a kind of reinforcing material widely used at present. Its main characteristics are high tensile strength, good creep performance, convenient construction and low price.