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Glass fiber geogrid plays an important role in old road reconstruction and asphalt pavement

Author: Hengke Shandong HuaSu Engineering Co., Ltd Time: April 3, 2020 06:10 Visits: second
Description: fiberglass geogrid plays an incomparable role in the reconstruction of old roads and asphalt pavement. Before laying, the humus soil and other unsuitable soil layers should be removed at least 30cm. The old subgrade should be stepped according to the design requirements, and the compactness should be checked. If it does not meet the requirements, it should be reinforced by impact rolling or dynamic compaction to make the compactness reach more than 95%. If the quality of the original shoulder is poor, it can not reach the standard According to the design requirements, the shoulder should be turned over and then rolled to meet the quality requirements, and the differential deformation caused by the splicing and widening of new and old subgrade should be reduced as far as possible.
 Glass fiber geogrid

Glass fiber geogrid plays an important role in old road reconstruction and asphalt pavement

Glass fiber geogrid The role in old road reconstruction
Due to the rapid development of highway construction, some roads with full load operation need to be reconstructed and widened. The splicing of new and old subgrade has become an important research topic in highway construction engineering. In the joint of new and old subgrade, the strength of subgrade and pavement structure is different, one side is the original old subgrade, and the foundation settlement is different, which leaves hidden danger for road cracking. The study of engineering practice shows that reinforcement can obviously improve the bearing capacity of soil. Geogrid is a product made of synthetic polymer as raw material. It has the characteristics of high strength and small creep, and can adapt to various environmental soils. Therefore, it plays an important role in the reconstruction of old roads.
? 1. Before laying the geogrid. The humus soil and other unsuitable soil layers should be removed at least 30cm, the old subgrade should be excavated according to the design requirements, and the compactness should be checked. If it does not meet the requirements, impact rolling or dynamic compaction should be used to enhance the compaction degree to more than 95%. If the original shoulder quality is poor and can not meet the design requirements, the shoulder should be rolled again after sunning to meet the quality requirements and reduce the splicing of new and old subgrade as much as possible The difference of deformation is widened.
 Function of glass fiber geogrid in old road reconstruction
? ? 2. During laying, the geogrid shall be tensioned by the crossbeam with row hook To produce 2% - 4% elongation and fix with u-row anchor. The overlapping length of two adjacent geogrids along the longitudinal direction shall not exceed 20cm, and nylon rope shall be used to tie the two Geogrids in zigzag shape to form a whole.
What role can glass fiber geogrid play in asphalt pavement;
Glass fiber geogrid is a kind of network structure material which is made of glass fiber as the main raw material by a certain weaving process. At the same time, in order to protect the glass fiber and improve the overall performance, the new excellent geogrid is formed by special coating process. Glass fiber geogrid has the characteristics of high tensile strength, low elongation, high elastic modulus and excellent resistance to high and low temperature. After surface coating, it has excellent alkali resistance and aging resistance. ??
The main component of glass fiber is silica. Its physical and chemical properties are very stable, with high strength, high modulus, high wear resistance and excellent cold resistance, without long-term creep; at the same time, it has good thermal stability, and its network structure makes the aggregate locked and restricted. Because of the special modified asphalt on its surface, it has double composite properties, which greatly improves the wear resistance and shear capacity of glass fiber geogrid.
? ? 1. Prevent reflection cracks
? ? Reflection crack is caused by the large displacement of the old concrete surface near the joint or crack, which results in the stress concentration in the upper asphalt overlay. It includes the horizontal displacement caused by temperature and humidity changes, and the vertical shear displacement caused by traffic load. The former results in concentrated tensile stress in the asphalt overlay above the joint or crack, while the latter causes the stress concentration in the asphalt overlay above the joint or crack The tensile and bending stresses on the top of the asphalt layer are greater. When the glass fiber geogrid is laid in the asphalt surface course, the high tensile strength and low elongation of the glass fiber geogrid are used to improve the tensile and shear capacity of the overlay structure, disperse the stress, prevent the cracks from extending to the pavement, and prevent the bottom cracks from reflecting to the pavement.
2. Improve the fatigue life of asphalt pavement
The pavement is under pressure in the area directly in contact with the wheel, while in the area outside the load edge, it is subject to tension. Due to the different nature of the force in the two stress areas, they depend on each other. Therefore, at the junction of the two stress regions, that is, at the sudden change of force, it is easy to damage. Under the long-term repeated action of vehicle load, fatigue cracks occur.
Laying glass fiber grid in asphalt surface course can disperse the above-mentioned compressive stress and tensile stress, form buffer zone between the two stress areas, and reduce the damage of asphalt surface layer caused by stress mutation. The high tensile strength and low elongation of the pavement material are used to improve the fatigue life of the pavement.
 Glass fiber geogrid can improve the service life of Asphalt Pavement
3. Improve the high temperature rutting resistance of asphalt pavement
The glass fiber grid is laid between the upper layer and the lower layer of the asphalt overlay, which plays a skeleton role in the asphalt surface course. The aggregate in asphalt concrete runs through the grid, forming a composite mechanical interlocking system, restricting the movement of aggregate, increasing the binding force in the asphalt surface layer. The various parts of the asphalt layer restrain each other to prevent the asphalt surface from moving forward, thus playing a role in resisting rutting.
? 4. Improve the low temperature shrinkage cracking resistance of asphalt pavement
The glass fiber geogrid is laid between the upper layer and the lower layer of the asphalt overlay, which can improve the tensile strength of the surface layer and resist the large tensile stress without damage. When cracks appear in the local area of the pavement, the stress concentration at the crack location will disappear through the transmission of glass fiber geogrid, and the cracks will not develop into cracks.
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