Geogrid wholesale in Minhang District, Shanghai

The main function of geogrid
is to slow down reflective cracks
Reflective cracks are caused by the large displacement of the old concrete surface layer near the joints or cracks causing stress concentration in the asphalt overlay layer above it. This includes horizontal displacements due to temperature and humidity changes and vertical shear displacements due to traffic loads. The former causes relatively concentrated tensile stress in the asphalt overlay above the joints or cracks, and the latter causes the asphalt overlay above the joints to undergo greater bending, tensile and shear stresses.
Due to the large modulus of geogrid, it can be used as a hard interlayer with high stiffness in asphalt overlay. Its function is to suppress stress release strain and at the same time serve as asphalt concrete reinforcement material to improve the tensile strength and tensile strength of the overlay layer structure. Shear resistance to reduce cracks. Practice has shown that the corresponding crack energy of a horizontal crack that has changed direction can be moved from its origin. Meters. Meters and above of width of reinforced material help to ensure that the energy is completely dissipated on both sides of the crack.
Fatigue cracking resistance
The main function of the asphalt overlay on the old cement concrete pavement is to improve the use function of the pavement, but it does not contribute much to the load-bearing effect. The rigid concrete pavement under the overlay still plays a key role. carrying role. When asphalt overlay is carried out on the old asphalt concrete pavement, the asphalt overlay will be carried together with the old asphalt concrete pavement. Therefore, asphalt overlaying on asphalt concrete pavement will not only cause reflection cracks, but also fatigue cracking due to long-term load effects. We conducted a stress analysis on the load bearing conditions of the asphalt overlay on the old asphalt concrete pavement: Since there is a flexible surface layer under the asphalt overlay with the same properties as the asphalt overlay, the road surface will deflect when it is subjected to load. The asphalt overlay in direct contact with the wheel is under pressure, and the surface layer is under tension in the area outside the wheel load edge. Since the force properties of the two stress areas are different and they are close to each other, there is a gap at the junction of the two stress areas. That is, damage is prone to occur at sudden changes in force. Fatigue cracking occurs under long-term load.
Fiberglass geogrid in the asphalt overlay can disperse the above-mentioned compressive stress and tensile stress between two stressed areas to form a buffer zone where the stress changes gradually instead of suddenly, reducing the impact of stress sudden changes on asphalt. Destruction of the overlay. At the same time, the low elongation of the fiberglass geogrid reduces the deflection of the road surface and ensures that the road surface will not undergo excessive deformation.
High temperature resistant rutting
Asphalt concrete has rheology at high temperatures. The specific manifestations are: the asphalt road surface layer becomes soft and sticky in summer, and dents are formed in the stressed area under the action of vehicle load. The asphalt surface is removed after the vehicle load is removed. The layer cannot fully recover to the condition before loading, resulting in plastic deformation. Under the action of repeated rolling by vehicles, plastic deformation accumulates to form ruts. After analyzing the structure of the asphalt surface layer, we can know that due to the rheology of asphalt concrete at high temperatures, there is no mechanism in the surface layer that can restrain the movement of the aggregates in the asphalt concrete when it is loaded, causing the movement of the asphalt surface layer, which is what forms ruts. main reason.
Fiberglass geogrid is used in the asphalt overlay, which plays a skeleton role in the asphalt overlay. The aggregates in asphalt concrete penetrate between the grids to form a composite mechanical interlocking system, which limits the movement of the aggregates and increases the lateral binding force in the asphalt overlay. Each part of the asphalt overlay restrains each other and prevents the asphalt overlay from moving, thus providing resistance. The role of rutting.
Resistance to low-temperature shrinkage and cracking
The surface temperature of asphalt roads in severe cold areas is close to the air temperature in winter. Under such temperature conditions, the asphalt concrete shrinks when exposed to cold and produces tensile stress. When the tensile stress exceeds the tensile strength of asphalt concrete, cracks will occur. Cracks will occur where the cracks are concentrated and cause disease. From the perspective of the causes of cracks, how to make asphalt concrete strong enough to resist tensile stress is the key to solving the problem.
The application of fiberglass geogrid in asphalt overlay greatly improves the tensile strength of asphalt concrete and can resist large tensile stress without causing damage. In addition, even if the stress at the location where the crack occurs is too concentrated due to cracks in a local area, the crack will gradually disappear through the transmission of the fiberglass geogrid and will no longer develop into a crack. When selecting fiberglass geogrid, in addition to its performance indicators complying with the requirements in the table above, special attention should be paid to ensuring that its width is not less than . At the same time, its mesh size should be ~ times the maximum particle size of the asphalt surface material on it. This will help achieve optimal shear adhesion and promote aggregate interlocking and restriction.
Uniaxially stretched plastic geogrid
is made of high-density polyethylene (D) as raw material, which is plasticized, extruded, punched, heated, and stretched, and then extruded into thin plates and then punched. A geogrid made of a mesh of regular holes that is then stretched longitudinally. In this process, the polymer is brought into a directional linear state and forms an oblong network-like overall structure with uniform distribution and high node strength. By stretching, the originally scattered chain molecules are reoriented into a linear state, which fully improves the tensile strength and rigidity of the grid. When it is laid in the soil, an efficient stress transfer mechanism is formed through the interlocking and interlocking effects between the grid mesh and the soil, so that the local load can be quickly and effectively spread to a large area of soil, thereby reducing the local load. The purpose of destroying stress is to improve the service life of the project.
Unidirectional plastic geogrid product features:
The outstanding advantage of polyethylene unidirectional tensile geogrid is that it has little tendency to deform (creep) under long-term sustained load and has high creep resistance. Geogrids, which are superior to other materials, play an important role in improving the service life of the project.
This product is suitable for the construction of highways, railways, reinforced retaining walls, dams, bridge decks, steep slopes and geocells on rivers, lakes and coasts. Its function is to improve the bearing capacity of the retaining wall or dam, extend its service life, reduce the floor space, shorten the construction period, reduce the cost and reduce maintenance costs.
Unidirectional plastic geogrid product usage:
Unidirectional tensile geogrid is a high-strength geosynthetic material widely used in dams, tunnels, docks, highways, railways, construction and other fields.
Its main uses are as follows:
. Reinforced subgrade can effectively distribute the diffuse load, improve the stability and bearing capacity of the subgrade and extend its service life
. Can withstand greater alternating loads
. Prevent roadbed deformation and cracking caused by loss of roadbed material
. Improve the self-supporting capacity of the fill behind the retaining wall, reduce the earth pressure of the retaining wall, save costs, extend the service life and reduce maintenance costs
. Combination The shotcrete construction method for slope maintenance can not only save %% investment but also shorten the construction period by more than double
. Adding geogrids to the roadbed and surface layer can reduce deflection, reduce rutting, and delay the occurrence of cracks. It can reduce the thickness of the structural layer by up to %
. It is suitable for various soils and does not require the use of materials from other places, saving labor and time
. The construction is simple and fast, which can greatly reduce the construction cost.
Construction method of one-way plastic geogrid
1. When used for roadbed and pavement, excavate the base bed and set up a sand cushion (the height difference is not greater than) and roll it into a platform to lay the grid longitudinally. The longitudinal overlap should be consistent with the main force direction. The transverse overlap should be tied with plastic tape and spaced on the laid grid. The geogrid laid on the ground should be fixed to the ground with nails. The geogrid laid should be backfilled with soil in time. The number of gate layers depends on the technical requirements.
2. When used for reinforced soil retaining walls, the construction regulations are as follows:
Set the foundation and carry out construction according to the designed wall system. When precast reinforced concrete panels are selected, they are generally thick-supported on the precast concrete foundation. . The width should not be greater than the thickness, not less than the burial depth, and should not be less than the depth to prevent the impact of frost heaving on the foundation. The wall foundation should be excavated and leveled according to the design requirements. The soft soil needs to be compacted or filled until the required density should be slightly beyond the range of the wall
. The main strength direction of the reinforcement should be perpendicular to the wall and fixed with pins
. The wall filling should be The distance between the mechanical filling wheels and the reinforcements should be at least approximately
thick after compaction. During wall construction, the wall should be covered with geotextile to prevent leakage of filling soil.
Biaxially stretched plastic geogrid
is made of high molecular polymer through the process of extrusion, plate forming and punching, and then stretched longitudinally and transversely. The material has great tensile strength both longitudinally and transversely. This structure can also provide a more effective force bearing and diffusion in the soil. The ideal interlocking system is suitable for large-area permanent load-bearing foundation repairs. powerful.
Usage:
Biaxially stretched plastic geogrid is suitable for various dams and roadbed reinforcement, slope protection, cave wall reinforcement, permanent bearing foundation reinforcement in large airports, parking lots, docks and freight yards, etc. powerful.
. Two-way geogrid is used to increase the bearing capacity of the road (foundation) foundation and extend the service life of the road (foundation) foundation.
. Two-way geogrid is used to prevent the road (ground) surface from collapsing or cracking and keeping the ground beautiful and tidy.
. Two-way geogrid is used to facilitate construction, save time and effort, shorten the construction period and reduce maintenance costs.
. Two-way geogrid is used to prevent cracks in culverts.
. Two-way geogrid is used to strengthen soil slopes to prevent soil erosion.
. Two-way geogrid is used to reduce the thickness of the cushion and save costs.
. Two-way geogrid is used to support the stable greening environment of slope grass planting mats.