At present, the application of smart technical textiles in the field of civil engineering has become more and more important. In addition to the application of optical fiber sensors, graphene, an emerging material, has also been developed and applied to geotextile leakage detection. Since the advent of graphene materials, it has received extensive research and attention. In just 10 years, its applications in the fields of RFIDs, composite materials, sensors and related products have become increasingly mature. At the same time, emerging application fields are still developing rapidly.
Recently, the application of graphene materials has expanded to the field of geosynthetic materials used on a large scale in the industrial field, and is considered to have brought about innovation in geosynthetic materials.
1. Performance and application fields of graphene composite conductive geotextile
Graphene is currently the thinnest and hardest nanomaterial in the world. It has high electrical conductivity, thermal conductivity and high strength. It is also hydrophobic and impermeable to all gas molecules. It can provide strength and self-healing capabilities that exceed those of steel, as well as excellent on the conductivity of copper.
Nano-geocomposites made by applying graphene to geotextiles are considered to be the future development trend of geosynthetic materials. Graphene will give geotextiles excellent properties, including excellent thermal conductivity (large thermal conductivity) and good electrical conductivity. , high strength (weight reduction), stability, self-healing, hydrophobicity, antibacterial performance (preventing filter clogging), temperature/pressure/humidity sensing function (temperature, pressure changes and leak location detection), big data collection and interpretation, etc.
The foreseeable application fields include waste landfills, mining, sewage treatment plants, lining systems of reservoirs, dams and other liquid storage tanks, etc. It has obvious advantages in replacing traditional EKG materials (electric geosynthetic materials), especially in storage It has great potential in liquid pool leakage detection.
2. Application of graphene composite conductive geotextile in liquid leakage detection
When leakage occurs in a liquid storage tank, traditional detection methods such as monitoring wells often fail to detect leakage and determine the location of the leakage point in time. Graphene composite conductive geotextile is used. When the conductive geotextile is not soaked by exudate, its resistance is a constant value. When leakage soaks the geotextile, the resistance will change. Special equipment connected to the conductive geotextile can detect the leakage in real time. The change in resistance is detected, so leakage can be discovered promptly and effectively, and the location of the leakage point can be determined by comparing data from detection points at different locations, so that the leakage point can be repaired in a timely manner.
Leakage detection of graphene conductive geotextiles
3. Manufacturing of graphene composite conductive geotextile
Australian graphene technology company Imagine IM collaborated with geotextile manufacturer Geofabrics Australasia to launch graphene composite conductive geotextile products (Bidim®) in August 2016 and announced that Australia has become the first country to use graphite in large-scale industrial products. ene country. It is reported that Imagine IM’s specially established North Geelong factory provides graphene coating technology solutions (imgne® In the field of liquid leakage detection in mining facilities and other areas, the first application installation is planned to be carried out at a coal seam methane station in Queensland in April this year.
According to estimates by Imagine IM, this technology can save 20% to 40% of costs compared to existing solutions. Tests have shown that the conductivity of graphene can be used to detect leaks in geotextiles with pore diameters as low as 1mm, and can show reliable results at test voltages as low as 5kV. The test did not produce any false alarms. Even when the geotextile is deformed, the test sensitivity at 15kV can be ensured at a distance of 1 to 20m from the ground wire, making it a very cost-effective conductive geotextile solution.
In addition, imgne®X3 as a graphene coating can enhance the electrical conductivity of textiles and other materials without affecting the strength and other properties of the material itself. Imagine IM expects to receive its first revenue from the sales license of imgne® X3 masterbatch in the first quarter of this year.
The Cambridge Graphene Center (CGC) has previously developed a graphene geomembrane material production technology, including the key manufacturing equipment extrusion system. Bandera Spa is one of the companies working with CGC in the production of graphene geomembranes and sheets. According to the company, its industrial extrusion line for graphene geosynthetics can produce up to several tons per hour and can produce Products with a width of up to 22m in the agricultural field, 3m in width for packaging and other fields, and 8.5m in width for waterproofing systems, the product can have a multi-layer (3 to 9 layers) structure depending on the application field.
Source: Textile Herald
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