Fiberglass geogrid for base stabilization

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TINM team explained the advantages of fiberglass geogrid for four road problems in a previous website article, and the two articles complement each other.

Fiberglass geogrid has very stable performance, high strength, high wear resistance, good cold resistance and good thermal stability（The melting point of glass fiber geogrid ＞250℃, and the melting points of pet geogrid and pp geogrid ＜ 200℃), which can improve the bearing capacity of foundation and asphalt mixed materials. The surface is coated with asphalt coating, making it more suitable for base stabilization projects.

1. Resist pavement cracking,

Asphalt pavement must have a certain load-bearing capacity and must not suffer fatigue damage within a specified period of time. The asphalt pavement is under pressure in the layer directly in contact with the wheel. In the area outside the wheel load edge, the surface layer is under tension. Since the force properties of the two stressed areas are different and they are close to each other, the two stressed areas are Destruction occurs at the junction of force areas, that is, at the sudden change of force, and cracking occurs under the action of long-term load.

The fiberglass geogrid in the asphalt surface layer can disperse the above-mentioned forces and form a buffer zone between the two stress-bearing areas, reducing the damage to the asphalt caused by sudden stress changes. At the same time, the low elongation of the fiberglass geogrid reduces the subsidence of the road surface and ensures that the road surface will not be excessively deformed.

2. Resistant to high temperature ruts,

Asphalt concrete has rheology at high temperatures. Under the action of vehicle load, the stress area will be depressed. After the vehicle load is removed, the asphalt surface layer cannot completely return to its original state, that is, it will deform. Under the action of repeated rolling crushing by vehicles, the asphalt concrete will deform. Continuous accumulation forms a rut.

Fiberglass geogrid is used in the asphalt surface layer, which plays a skeleton role in the asphalt surface layer and forms a composite mechanical interlocking system, which increases the lateral binding force in the asphalt surface layer. Each part of the asphalt surface layer restrains each other. Prevents the displacement of the asphalt surface layer.

3. Resistant to low temperature shrinkage cracking,

During severe cold periods, the temperature of the asphalt concrete surface layer is close to the air temperature, and the asphalt shrinks when it is cold. Under repeated loads, cracks occur. At both ends of the crack, the tensile stress becomes more concentrated, and the crack gradually forms a crack.

The fiberglass geogrid is placed in the asphalt, which greatly improves the tensile strength of the asphalt, which is enough to resist large tensile stress without causing pavement damage. Even if small cracks occur in local areas, the stress at the cracks is concentrated, and the stress at the cracks is concentrated through the glass fiber. The geogrid disappears due to the transfer, and the cracks will not develop into cracks.

4. Delay reflective cracks

There are two types of reflections caused by cracks. One is that after cracks occur in the surface layer, the cracks will reflect downward, destroying the underlying structure and reducing the strength of the pavement structure. During the rainy season, water enters the cracks and will be repeatedly resisted by the traffic load (tire pressure). Pressure, water creates water pressure in the cracks, and the water continuously impacts the asphalt mixture, causing the cracks to expand.

The other is the original cracks in the old surface layer. The cracks generated in the subgrade layer or the underlying subgrade layer are reflected upward. The new covered pavement cannot withstand the shear force and tensile stress caused by the movement of the bottom layer, resulting in cracks in the pavement surface layer.

Adding a fiberglass geogrid interlayer to the asphalt overlay can suppress stress, release strain, enhance the overall strength of asphalt concrete, and prevent cracks from reflecting upward or downward.