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Comparison of Three AOCOMM® Geogrid

 1. Overview

With the development of reinforced technology and the continuous improvement of geosynthetics reinforcement theory, AOCOMM continuously developed new types of geosynthetics, including three kinds of geogrid, that is plastic geogrid, warp knitted geogrid and glass fiber geogrid, infusing new blood to civil engineering and other fields. Today, the construction engineering is more and more complicated, and the requirements of the performance of building materials are more strict, so it is extremely important to choose the proper material for the project quality control.

2. Three geogrid performance comparison

Experts from AOCOMM have conducted a detailed analysis and discussion to determine the performance of the three geogrids, then compared some of their important engineering properties, the results are shown in Table 1.

Table 1 Comparison of three different geogrid performance

Type

Ultimate tensile strength

Ulimate elongation

Contact strength

Temperature

Creep

Sfiffness

Plastic geogrid

General

≥10%

High

General

Big

Big

Warp Knitted geogrid

High

About 10%

Low

Better

Larger

General

Fiberglass geogrid

Very High

About 3%

Low

Very good

None

General

From Table 1 is not difficult to draw the following conclusions: 

(1)   The ultimate tensile strength of geogrid from high to low is listed in the following sequence:  glass fiber geogrid, warp knitted geogrid, plastic geogrid, and the ultimate elongation from high to low are followed by warp knitted geogrid, plastic geogrid. The expansion rate of the geogrid as the material has a larger range of changes, and some may be smaller than the plastic geogrid, glass fiber geogrid. Glass fiber geogrid is not creep.

(2)   Fiberglass geogrid has significantly better temperature resistance than other kinds of geogrid, as a result of impregnation coating, temperature resistance of the warp knitted geogrid has improved.

(3)  Vertical and horizontal joints of plastic geogrid are molded directly, so the strength and vertical and horizontal ribs are of the same strength, and the joints of the warp knitted, glass fiber geogrid are woven, so the intensity is much lower than its own strength. 

3.Comparison of applications of three kinds of geogrid

3.1 Application of geogrid  

The application of plastic geogrid applications:

(1)  Uniaxial  geogrid: 

Uniaxial geogrid is applicable to the road and railway road bed, embankment, slope reinforcement, all kinds of retaining wall reinforcement, reinforcement of the river dam and the yard reinforcement, abutment reinforcement, the more shallow foundation of the reinforcement, widely used in various types of reinforced retaining wall. 

(2)   Biaxial geogrid: 

The biaxial geogrid is suitable for the enhancement of the permanent bearing foundation of the highway and railway embankment, the embankment reinforcement, the shallow foundation reinforcement, the large-scale square, the yard, the dock yard, as well as the reinforced embankment of the riverbed and the reflective crack of the asphalt pavement, widely used in roadbed, embankment and reinforced shallow foundation.

3.2 Application of warp knitted geogrid 

The scope of application of warp knitted geogrid is: soft soil foundation, embankment reinforcement, in order to homogenize the stress, improve the stability of the basement, adjust the settlement, reduce the uneven settlement, improve the bearing capacity; It is used to reinforce embankment slope and improve stability of slopes. It is used to reinforce abutments, improve the integrity and strength of abutments, and prevent the bridgehead from jumping. As the asphalt pavement reflects cracks, the strength of pavement base is strengthened. Therefore, the high-strength fiber as the raw material of the warp knitted geogrid become the most promising products. Due to the current warp knitted geogrid joints are woven by the vertical and horizontal ribs, which often slip after the force, the actual control of the strength of the building material is from the joints instead of the strength of the ribs, so the design should pay special attention to the value of building material strength.

3.3 Application of glass fiber geogrid 

Fiberglass geogrid is applicable for asphalt and concrete pavement reinforcement, prevention and treatment of road reflection cracks and the convergence of old and new pavement and other deformation. Fiberglass grids for asphalt roads play a role of anti-fatigue cracking, anti-low temperature shrinkage, high temperature rutting and delayed reflection cracks.  

4. Analysis of some controversial issues

4.1 Whether the plastic geogrid can be used for pavement reinforcement and reflection cracks

Plastic geogrid for pavement reinforcement and reflections cracks began in the mid-1980s. After four years of study by Brown of the University of Nottingham et al., a report published in 1985 pointed out that plastic geogrid can extend the useful life of asphalt pavement and later comparison experiment of different geogrid used in road reflection cracks. The test results show that after 14 months of repairing the pavement with glass fiber geogrid, some short hair cracks appeared, and a few similar hair cracks appeared after 32 months. The use of plastic geogrid surface 9 months after repairing the hairline cracks, followed by cracks increased, 14 months after the uplift of many asphalt mixture. From the above analysis we can see: plastic geogrid can be used for pavement reinforcement and reflective cracks, but the effect is not very satisfactory, the analysis may be due to the following: ① itself is not high temperature, hot asphalt fusion may occur the material damage; ② bonding with the asphalt less effective, in the repeated load and the role of hot and cold temperature difference, easy and bitumen separation, the infiltration of water generated by the upward pressure more quickly worsen the speed. 

4.2   Fiberglass geogrid can be used for soft foundation treatment

Fiberglass geogrid used for the treatment of soft base experiments, the application is not much. However, fiberglass geogrid in the end can be used for soft foundation treatment. The following analyzed of the nature of the material itself and the nature of the soft soil. We know the high strength of glass fiber, which is very beneficial for reinforcement. However, the ultimate elongation of glass fiber geogrid is very small (about 3%), but also has a great brittleness, if used in the uneven ground or bent place, it is easy to break during construction and after completion of loading damage. In general, the treated soft base will undergo some deformation, and deformation is of more than 3%. If the use of fiberglass geogrid reinforcement processing, it may cause fiberglass geogrid too large and occurred rupture damage. At the same time, the overall integrity and stiffness of glass fiber geogrid materials are not as good as plastic geogrid, so, we should not try to use fiberglass geogrid for soft foundation treatment. 

5. Conclusion

Choosing different reinforcement materials according to different reinforcement conditions is the key to the successful application of the project. In the choice of materials, the application condition of the same type of project should be more frequently referred to, at the same time pay more attention to the engineering requirements of the strength and elongation of the building materials, not just from a certain point of view, it will be more conducive to the rational use of technology.

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