High Strength Plastic Geocell
Geocell is a new type of geosynthetic material with high strength, large bearing capacity and small deformation. It has been widely used in roadbeds and other engineering projects.
It is made from polyethylene plastic, wood shavings and fiberglass cloth. These three raw materials can be mixed to improve their mechanical performances and provide environmentally friendly characteristics.
Tensile Strength
The tensile strength of High Strength Plastic Geocell (previously known as Neoloy) is the load it can withstand before failing. This value is measured through a laboratory tensile test. The test results are used to determine the material strength of a geocell, which is important for project design and safety considerations. The tensile test is performed by applying a constant load at a specific speed until the point of failure is reached.
The test is conducted on a specimen that has been cut to a specified length. A flat compression clamp is then placed on the specimen and secured by bolts to ensure that it stays in place during testing. The test is performed using a universal tensile testing machine for geosynthetic materials.
It is important to test the tensile strength of geocells because they are often exposed to dynamic loading conditions. These loading conditions cause the cells and junctions to undergo creep, which can result in a loss of geometry and stiffness. To avoid this, the Dynamical Mechanical Analysis (DMA) test is utilized. This test measures the net elastic modulus of polymers to ensure that they are capable of storing and releasing dynamic loads without permanent deformation or loss of stiffness.
The tensile strength of High Strength Polyethylene Geocell is dependent on the raw material, ambient temperature, and tensile test condition. Masahiro Shinoda studied the effects of tensile test conditions on the stress-strain response of geocell specimens by varying the tensile rate, specimen length, and specimen width. He found that the tensile strength of the geocells made from different raw materials varied, and that HDPE geocells were more sensitive to low temperatures than PP and PET ones.
Elastic Modulus
The elastic modulus of a geocell is an important factor to plastic geogrid consider when designing the reinforcement in pavements and slopes. This is because it determines the amount of hoop stress that can be provided to soil. It also helps in determining the maximum load that can be applied to the geocell and its junctions.
In the laboratory, the tensile mechanical properties of geocell strips are tested using a universal testing machine for geosynthetic materials. The test results are recorded as force (kN) versus displacement (mm). According to the specifications of this instrument, the type I dumbbell specimen and the type II rectangular specimen were used for the tensile tests on geocell strip. However, the tensile test results of the type III trapezoidal specimen have not been reported yet.
To analyze the tensile properties of the geocell strip, the stress-strain relationships of three types of raw material were first investigated at room temperature. It was found that the elongation of the HDPE geocell specimen is sensitive to temperature, with an obvious necking phenomenon and large lateral deformation. On the other hand, the PP and NPA specimens exhibit less sensitivity to temperature and more concentrated stress-strain curves.
The tensile mechanical behavior of the geocells can also be analyzed by performing a biaxial tensile test on the geocell-reinforced quadrangle wedge (QW) with and without a geocell junction. The results of the biaxial tensile test show that the confined, single geocell-reinforced QW has a lower cumulative deformation than the unconfined case. This is mainly due to the confinement of the geocell by the soil and the hoop stress provided by the geocell junction.
Fracture Resistance
Geocell is a three-dimensional honeycomb-shaped reinforcement material used in engineering constructions to restrain soil laterally and improve its stability. Compared to planar reinforcement materials, geocell has better confinement and provides better support for infill materials. This is especially important in cold areas where the ground substrate has low mechanical properties. In this study, the tensile mechanical behavior of geocell strips made of different raw materials under low temperatures was studied by means of laboratory tensile tests. The stress-strain relationship and failure characteristics were analyzed.
The results of the tensile tests showed that the overall tensile properties of the three types of geocell were similar. However, there were some differences in their fracture resistances. The HDPE specimen has a lower fracture resistance than the PET and PP samples. This is because the production process of the HDPE geocell strips involved extrusion, which causes the molecular chains to not be fully oriented. It also has a favorable ductility, which makes it more difficult for the molecular chains to orient under a tensile load.
In order to explore the influence of the geometry and width of the geocell strip on its tensile mechanical behaviors, this research conducted a series of tensile tests and trapezoidal test on a HDPE geocell strip with a welding junction in the laboratory. The tensile strength and elongation test results of the specimen with a junction were compared with those of the type I dumbbell specimen and the type II rectangular specimen.
Water Resistance
Plastic geocells have excellent geogrid for retaining walls water resistance, which makes them ideal for use in various construction projects. They can help stabilize sloped surfaces and reduce erosion, while also promoting the growth of vegetation. They are also lightweight and durable enough to withstand different environmental elements.
Plastic geocells are made using a new type of high-strength geosynthetic material. They are welded together to create a three-dimensional reticular formation, making them easy to transport and install. They are also made with a perforation pattern to allow for water drainage. They also have a textured surface that grips soil and prevents slippage.
During the manufacturing process, each plastic geocell is subjected to rigorous quality control checks. This is important because these products are often used for sensitive construction purposes that require adherence to industry standards.
Once the geocells are finished, they are packaged and transported to the construction site. Once they arrive, they are folded and unrolled to adjust them according to the desired design. They are then filled with soil, gravel, concrete, or other granular materials to create a stronger foundation.
Plastic airfield geocells can help to strengthen grassy runways and increase their load capacity. The TERRA-GRID E 35 geocell, for example, has a rhomboidal indentation texture that allows it to create friction and keep the fill material in place. It is also resistant to UV radiation, frost, oils, solvents, salt, and acids.
