Characteristics and application of glass fiber geogrid in anti-crack pavement

1. Characteristics of glass fiber geogrid

• High tensile strength and low elongation
  • Glass fiber geogrid is made of glass fiber, which has high strength, exceeding other fibers and metals. It has high tensile strength and low elongation in both warp and weft directions, and can withstand large tensile force without over-extension. This characteristic makes it effectively resist tensile deformation caused by various stresses in pavement structure, thus preventing the occurrence of pavement cracks. For example, high tensile strength can ensure the integrity of the pavement structure when the pavement expands and contracts due to vehicle load or temperature change.
• Good physicochemical stability
  • Glass fiber is an inorganic non-metallic material with excellent physicochemical stability. It can resist all kinds of physical wear and chemical erosion, as well as biological erosion and climate change, and has excellent properties such as acid resistance, salt and alkali resistance, and oxidation resistance. This stability allows the fiberglass geogrid to maintain its performance under different environmental conditions, and effectively play the anti-cracking role for a long time, whether it is in wet, acid-alkali environment or other harsh road conditions, it can work normally.
• High and low temperature resistance
  • In road construction, the temperature of paved asphalt concrete is as high as 130-140 ℃，Generally, chemical fibers, plastic geonets or other organic fabrics will soften at such high temperatures, while glass fibers melt at 1000 ° C. ℃Above, as long as the construction procedure is normal, it will ensure the stability of the fiberglass geogrid to withstand heat in the paving operation. At the same time, in the severe cold period, the temperature of the asphalt concrete surface layer is close to the air temperature, and the asphalt concrete shrinks when it is cold. Glass fiber geogrid can also adapt to the low-temperature environment, prevent the pavement from cracking due to temperature changes, and has the ability to resist low-temperature shrinkage cracking. For example, in road construction in cold areas, it can effectively reduce the damage caused by low temperature of the pavement 。
• Aging and corrosion resistance
  • Fiberglass geogrid has excellent properties of anti-aging and corrosion resistance. Long-term exposure to the natural environment, pavement materials are easily eroded by ultraviolet rays, rain, air and other factors, aging and corrosion, resulting in performance decline. Fiberglass geogrid can resist the influence of these factors, maintain the stability of its structure and performance, thus prolonging the service life of pavement, continuously exerting its anti-crack function, and can be widely used in various climatic conditions and different road environments 。

2. Application of glass fiber geogrid in anti-crack pavement

• Reinforced pavement structure
  • Fiberglass geogrid can be used as a reinforcement material embedded into asphalt concrete ( AC） Or concrete pavement, increase the tensile strength and bearing capacity of the pavement. When the pavement is affected by traffic load, temperature change and foundation settlement, it can share the stress and reduce the cracks and damage caused by these factors, just like adding steel bars to buildings, and improve the strength and stability of the whole structure 。
• Controlling crack propagation
  • Once cracks appear on the pavement, the addition of glass fiber geogrid can effectively control the propagation of cracks and prevent the cracks from developing in the direction of depth and width. It can disperse the stress at the crack into the surrounding pavement structure, avoid the crack from expanding further, help to extend the service life of the pavement, and reduce maintenance and repair costs. This is of great significance to reduce the development of pavement diseases and maintain the normal use of roads 。
• Improve the water resistance of pavement
  • Fiberglass geogrid can increase the compactness and impermeability of the pavement, and prevent moisture from penetrating into the road base layer and the bottom of the pavement. Moisture is one of the important factors leading to pavement damage and crack formation. By preventing the infiltration of moisture, we can reduce pavement damage and crack formation caused by moisture, keep the pavement structure dry and stable, and further improve the durability of pavement.
• Adapt to pavement deformation
  • The flexibility and adaptability of glass fiber geogrid enable it to adapt to the deformation and change of pavement. When the road surface is deformed due to vehicle load, temperature change and other factors, the glass fiber geogrid can deform accordingly without breaking or losing its function, reducing cracks and damage caused by road surface deformation, and ensuring the smoothness and integrity of the road surface.