Tips for Geotextile Felt Installation

With the development of construction engineering, geotextiles have been widely used in the construction industry, environmental protection and sanitation projects. Their application range is wide. Then, here is our tips for geotextile installation, which stars from explaination of geotextile felt properties.

Geotextile usually defined as s a kind of chemical synthetic fiber product. Its raw materials can be polypropylene, polyester, polyamine, etc. Geotextile can be divided into two categories: woven fabric and non-woven fabric. The so-called woven fabrics are obtained by polymer fibers, then spun into threads, and weaving on a loom to form a cloth with a regular organization. Non-woven fabrics are made by needle-punching, thermal bonding and chemical bonding directly with synthetic fibers without weaving process.
 

Since the raw material of geotextile is a chemical fiber product such as polypropylene, it has the features of strong chemical resistance, high melting point and high strength. Compared with woven fabrics, non-woven fabrics have lower cost, simple process, high yield strength, and no significant directionality in tensile strength. Therefore, non-woven fabrics are the most widely used geotextiles in the world.

1.To clean the pavement so that there is no debris on the pavement, it is best to clean the pavement with clean water. Cracks with size of larger than 0.6 cm on the pavement should be repaired in time. Asphalt concrete, tar sand or cement mixed soil can be used as repair material based on different conditions.

2.The hot asphalt spraying truck sprays the tack coat oil on the pavement surface. The amount of oil can be depended on the oil absorption rate of the pavement surface. The general dosage is between 0.9-1.2kg/m², and the oil number is generally 60 or bigger.

3.When placing the geotextile felt, it is necessary to ensure a certain height of the coil material from the pavement surface. When the non-woven geotextile is stretched and straightened, then it can be bonded with the tack coat oil, later can be brushed to keep smooth and finally can be made dense by roller compaction.

4.After the geotextile felt and the tack coat oil are thoroughly combined, non-crushed stone chips can be sprinkled on the geotextile felt. Generally, the sand can be melon-seed size sand or medium-coarse sand. The amount of sand is depended on the oil bleeding situation on the geotextile felt. Usually it is 2m³ / km².

5. When placing a large area of ​​geotextile, at the horizontal overlap of geotextile cloth, a fixture can be chosen to be used based on the specific situation.

At the same time, the geotextile should be kept dry. If it is rained, it needs to be dried before its placement. When installing geotextiles, installation workers must not smoke. Only in the conditions that the asphalt used for bonding geotextiles is cooled, then the overlying material can be installed. When the geotextiles are saturated and the hot asphalt is not cooled yet, vehicles are not allowed to drive on it. Meanwhile turning around and brake are both not allowed on the installed geotextile felt.