Development and Research Status of Geotextiles at Home and Abroad
Abstract: The concept, classification and raw materials of filament nonwoven geotextile manufacturers, as well as the research status and application development of filament nonwoven geotextile for sale at home and abroad, are expounded, and the status quo of several new high quality filament nonwoven geotextile is introduced.
Keywords: polypropylene nonwoven geotextile factory price; performance; application; status
The American Society for Testing and Materials (ASTM) stipulates that all textiles used with foundations, soil, rock, earth, and other civil materials as part of the engineering structure are called polypropylene nonwoven geotextile factory price. filament nonwoven geotextile for sale has good functions of reinforcement, protection, isolation, drainage, filtration, anti-seepage and leakage prevention. Therefore, they are widely used in roads, railways, civil engineering, water conservancy projects, environmental protection projects, etc., and are related to wood, steel, and cement. Together they are called the four major building materials. In 1926, filament nonwoven geotextile manufacturers were first used in the field of geotechnical engineering in the Netherlands; in the late 1950s, the United States first used high quality filament nonwoven geotextile in the field of beach revetment engineering to replace traditional sandstone filter materials; in the early 1980s, geotechnical engineering Cloth began to be widely used in China’s railway and water conservancy departments.
1. Overview of geotextiles
1.1 Classification
According to different processing and production methods, filament nonwoven geotextile for sale is roughly divided into four categories: textile polyester nonwoven geotextile factory price, non-woven wholesale polyester nonwoven geotextile, synthetic filament nonwoven geotextile factory price, and composite polypropylene nonwoven geotextile factory price. Among them, textile filament nonwoven geotextile factory price is mainly divided into three types: knitted, woven and woven filament nonwoven geotextile factory price. Nonwoven filament nonwoven geotextile factory price can also be divided into three types: spun clay cloth, short fiber needled filament nonwoven geotextile factory price and hot melt bonded wholesale polyester nonwoven geotextile. Non-woven filament nonwoven geotextile manufacturers are simple to process, high in production efficiency, low in cost, and have good extensibility, mechanical properties, and horizontal percolation filtration performance, so they have the widest application field and the largest application. Synthetic polyester nonwoven geotextile factory price is classified into geomembrane, grid, grid, flakes and geotechnical sheets according to product classification. The composite high quality filament nonwoven geotextile is divided into a needle-punched composite filament nonwoven geotextile factory price, a knitted-stitched composite wholesale polyester nonwoven geotextile, a bonded composite filament nonwoven geotextile factory price, and an ultrasonic composite filament nonwoven geotextile factory price according to different composite processes. The composite polypropylene nonwoven geotextile factory price not only has the characteristics of non-woven filament nonwoven geotextile for sale, but also the advantages of woven and woven polyester nonwoven geotextile factory price. Its comprehensive performance is excellent and can meet the special needs of various projects, so it is widely used in engineering.
1.2 Raw materials used
The physical properties, chemical properties, and service life required in the application environment are the primary considerations for selecting high quality filament nonwoven geotextile materials. Due to the polypropylene nonwoven geotextile factory price used, costs must also be considered. In general, natural fibers are inferior to synthetic fibers in terms of strength, aging resistance, acid and alkali resistance, and corrosion resistance. Therefore, the raw materials used in filament nonwoven geotextile manufacturers are mostly synthetic fibers such as polyester fibers (polyester) and polypropylene. Fiber (polypropylene), polyamide fiber (nylon), polyvinyl acetal fiber (Vinyl) and polyacrylonitrile fiber (acrylic fiber), etc., the most widely used are polyester fiber and polypropylene fiber.
In recent years, some natural fibers, biodegradable fibers, and inorganic fibers have gradually been adopted in filament nonwoven geotextile for sale materials at home and abroad. Related studies have shown that some natural fibers can be used in the roadbed, drainage, bank protection, soil erosion control, such as jute, kenaf, coconut shell fiber, bamboo pulp fiber. Amit Rawal et al. analyzed the structure of jute and polyester nonwoven polypropylene nonwoven geotextile factory price, and the results showed that the former had less anisotropy and the fabric was tight. DS Technical Nonwoven has developed a polylactic acid high quality filament nonwoven geotextile for the protection of vegetation, which has the advantage of being biodegradable.
2. Development and application of geotextiles at home and abroad
According to a research report by market research firm Transparency Market Research, the global market value of filament nonwoven geotextile manufacturers is expected to reach $6.4 billion in 2018. It is predicted that the demand for global filament nonwoven geotextile for sale will increase to 3.398 billion m2 in 2018.
2.1 Status of application and development of geotextiles abroad
In the application of high quality filament nonwoven geotextile, European and American countries, as pioneers, began to apply them to road construction as early as the 1960s. Since the 1970s, wholesale polyester nonwoven geotextile has been used in railway construction, river embankment, and coastal protection. In 2013, the US and Canada geosynthetics market were $2.2 billion, an increase of 3% compared to 2012. In the next five years, sales in the North American market are expected to grow at a rate of 9.9% per year. In 2018, the demand for polypropylene nonwoven geotextile factory price in Europe will reach $1,647.7 million. According to Transparency Market Research, the polyester nonwoven geotextile factory price market in the Gulf Cooperation Council (excluding Arab) region reached US$101 million. The market sales in 2013-2019 increased by 10.3%, and it is expected to exceed US$200 million by 2019. In 2012, the demand for filament nonwoven geotextile manufacturers products was 52 million m2. During 2013-2019, the average annual growth rate of product demand was 7.6%, and it is expected to reach 86.8 million m2 by 2019.
2.2 Status of application and development of domestic geotextiles
The production and application of polypropylene nonwoven geotextile factory price started late in China, and it was not until the end of the 1970s that filament nonwoven geotextile for sale began to be produced and applied in China. Before 1986, China’s wholesale polyester nonwoven geotextile products were mainly polypropylene woven fabrics, with a cumulative consumption of fewer than 1 million m2. At the end of the 1980s, the production and application speed of polyester nonwoven geotextile factory price in China accelerated, especially the production technology of non-woven filament nonwoven geotextile factory price became more and more mature. According to statistics, during the period of 2006-2010, the annual growth rate of China’s polypropylene nonwoven geotextile factory price production was as high as 35%. Until 2015, the consumption of high quality filament nonwoven geotextile in China has exceeded 300 million m2. In recent years, as China continues to increase the construction of infrastructures such as railways, highways, landfills, and the implementation of the “One Belt, One Road” development strategy, it has provided a strong impetus for the development of filament nonwoven geotextile manufacturers. In the first half of 2016, China’s fixed assets investment in transportation continued to grow. The road and waterway industry completed fixed assets investment of 78.13 billion yuan, up 8.7% year-on-year. On the railway side, China plans to invest 800 billion yuan in 2016. During the month of May, the railway’s fixed-asset investment increased by 11.8% year-on-year. China plans to build a high-speed railway network of “eight vertical and eight horizontal”. By 2025, the high-speed railway will reach 38,000 km. Large-scale railway construction will bring a huge application market for geotechnical materials.
3. Geotextile product performance study
3.1 Physical and mechanical properties
Song Qinjie et al. tested the breaking strength, elongation at break, tensile strength and creep properties of hot-melt bonded and the recompression bonded polypropylene nonwoven filament nonwoven geotextile for sale. The results show that the hot-press bonded nonwoven high quality filament nonwoven geotextile is only worse than the hot-spot bonded nonwoven wholesale polyester nonwoven geotextile in terms of tensile strength, and other properties are superior to hot-bonded non-woven polypropylene nonwoven geotextile factory price.
Natália de Souza Correia et al. evaluated two nonwoven polyester nonwoven geotextile factory price polyester and polypropylene filament nonwoven geotextile manufacturers that are often used in anti-reflective crack systems. The wide tensile test after asphalt impregnation was carried out according to the specification of ABNT-NBR12824 (1993) to test the increase of the initial stiffness of the wholesale polyester nonwoven geotextile. The results show that the tensile strength value increases significantly. When the strain is less than 0.05%, the strength value increases sharply, the strain increases, and the obtained stiffness decreases.
Amit Rawal et al. proposed a simple model for the axially symmetric tensile strength of anisotropic hybrid needle-punched nonwoven filament nonwoven geotextile for sale. The internal tensile properties were obtained by tensile tests from large widths in the weaker direction; axially symmetric tensile strength was used. The model tests different proportions of polypropylene/viscose mixed high quality filament nonwoven geotextile. The test results show that the axially symmetric tensile strength theory and experimental results have a good correlation.
3.2 Permeability
Wang Xiangqin et al discussed the relationship between the permeability of spunbonded needle-punched nonwoven polypropylene nonwoven geotextile factory price and the pore size characteristics and compression properties. The results show that the decrease of the average pore size of the filament nonwoven geotextile manufacturers leads to the decrease of the flow velocity index; when the pressure is the same, the increase of the polyester nonwoven geotextile factory price density leads to the increase of the vertical permeability coefficient; when the areal density is constant, the vertical permeability coefficient increases with the pressure. Reduced.
Li Zhihong et al. explored the relationship between the permeability of woven polyester nonwoven geotextile factory price and the fabric structure, yarn fineness, warp, and weft density, etc., and determined the regression relationship between the permeability coefficient of high quality filament nonwoven geotextile and the fabric structure parameters.
Yiping Zhang et al. carried out a series of permeable experiments on polypropylene is woven filament nonwoven geotextile for sale under tensile strength of 20～30 kN/m. The experimental results show that under tension conditions, the dielectric constant of the polypropylene nonwoven geotextile factory price decreases rapidly in the direction of the warp yarn, and then approaches a value which is 10% to 25% of the dielectric constant of water in the absence of tension. In contrast, in the direction of the weft yarn, as the tension increases, the dielectric constant of water increases and there is no stable value. According to the result, a reasonable load can be applied in the warp and weft directions to make the filament nonwoven geotextile manufacturers have the best water permeability.
3.3 Interface strength
Liu Xiangyuan et al. used two kinds of polyester-spun polyester nonwoven geotextile factory price as reinforced materials and clay as fillers. A series of direct shear tests and pull-out tests were carried out using the direct shear drawing friction test system (TUH-2C). The results show that the tensile interface strength and the straight shear interface strength of high quality filament nonwoven geotextile and clay are in accordance with the Mohr-Coulomb strength type, the direct shear friction coefficient is between 0.87 and 1.71, and the drawing friction coefficient is between 0.38 and 0.81. It can be seen from the data that the interface friction performance can meet the needs of engineering when the application engineering is reinforced.
MMA Sayeed and other sands are used as fillers. polypropylene nonwoven geotextile factory price and jute/polypropylene hybrid nonwoven wholesale polyester nonwoven geotextile are used as reinforcement materials. Direct shear tests are carried out under three normal stress conditions to determine the sand and filament nonwoven geotextile manufacturers. Interface shear characteristics. The results show that under the condition of high normal stress, the interface between the wholesale polyester nonwoven geotextile and the sand has a higher initial shear stiffness than the interface between the polyester nonwoven geotextile factory price and the sand. Despite this, and has a similar contact efficiency with sand and polypropylene wholesale polyester nonwoven geotextile compared to mixed filament nonwoven geotextile for sale.
Andreia Moreira et al. conducted experiments on large-scale direct shear tests based on cyclic loading and cyclic displacement. The interface friction test was between filament nonwoven geotextile factory price and filament nonwoven geotextile factory price, sand-filled wholesale polyester nonwoven geotextile, sand layer and Sand-filled between polyester nonwoven geotextile factory price bags. The results show that the friction parameters (ie shear strength and friction angle) obtained from the geotechnical specimens are lower than those filled with sand. Sand interface tests have shown that changes in the shear plane of sand-filled high quality filament nonwoven geotextile embedded in the sand layer are likely to occur. Deformation can lead to instability at the bottom, which ultimately leads to the accumulation of damage and collapse of the entire structure.
3.4 Impact of the environment on geotextiles
Han Yong Jeon simulates the application environment of polypropylene nonwoven geotextile factory price in a landfill. In the solution of pH 3, 8, 12 and landfill leaching solution, the modified EPA9090 test method is used to test polyester nonwoven geotechnical Chemical resistance of 8 filament nonwoven geotextile manufacturers such as cloth, polypropylene non-woven wholesale polyester nonwoven geotextile, and composite polyester nonwoven geotextile factory price.
José Ricardo Carneiro et al. studied the existence of synergy between some degradation agents of polypropylene filament nonwoven geotextile for sale. Geotextiles are immersed in some liquids (water, sulfuric acid, and nitric acid, sodium hydroxide and metal ion solutions) for thermal oxidation and artificial weathering. The results indicate that, in some cases, the combined action of the two degrading agents is more destructive than the separate use of each agent. For example (1) immersion in sodium hydroxide and thermal oxidation; (2) immersion in ferric nitrate and thermal oxidation; (3) immersion in cadmium or copper nitrate and artificial aging.
Qian Cheng and others used Y802A eight-basket constant temperature oven to heat the polypropylene woven high quality filament nonwoven geotextile to study the effect of temperature on the performance of polyester nonwoven geotextile factory price. The results show that as the temperature increases, the strength of the filament nonwoven geotextile factory price first increases and then decreases, while the shrinkage rate increases.
4. Status of several new geotextiles at home and abroad
4.1 Glass fiber geotechnical materials
Glass fiber geotechnical products have the characteristics of high strength, low elongation, high-temperature resistance, high modulus, lightweight, good toughness, corrosion resistance, and long service life, and they usually exert their reinforcing and reinforcing functions. Glass fiber geotechnical materials can be divided into three types: glass fiber grating, glass fiber network cloth and glass fiber composite polypropylene nonwoven geotextile factory price. The characteristics of this product determine its good application prospects in road engineering, airport runway maintenance, dam, riverbank, slope protection, and other engineering fields.
4.2 Jute Geotextile
As a kind of natural fiber, jute fiber has many advantages and is suitable for the production of filament nonwoven geotextile manufacturers. It has high strength, is suitable for textile thick polyester nonwoven geotextile factory price, has good water absorption, environmental protection, and low price. For example, Ghosh et al. designed a jute filament nonwoven geotextile factory price suitable for revetment engineering; designed and developed a woven jute wholesale polyester nonwoven geotextile with potential applications in geotechnical engineering. The ecological harmony of jute high quality filament nonwoven geotextile and its superior ability to control soil erosion make it a promising application in various engineering fields.
4.3 Polypropylene spun acupuncture geotextile
Polypropylene filament non-woven wholesale polyester nonwoven geotextile has the advantages of high strength, acid and alkali resistance, corrosion resistance, mildew resistance, and low-temperature resistance. According to the characteristics of polypropylene filament non-woven filament nonwoven geotextile for sale, it has a good application prospect in the fields of road and railway subgrade laying, dam reinforcement, sewage treatment plant, landfill, hydraulic structure seepage prevention, and building anti-seepage. However, in the past 20 years, the development of filament nonwoven geotextile factory price in China has lagged behind. The only practical application is polyester. At present, only Shaoxing Lida Nonwovens Co., Ltd. has successfully built the first domestic polypropylene filament wholesale polyester nonwoven geotextile production line.
4.4 Geotextile modification
The presence of deposits containing harmful components such as organic compounds and heavy metals may affect the surrounding environment. In some ports, a large amount of sediment and sludge containing high concentrations of heavy metals such as arsenic, cadmium, chromium, copper, mercury, nickel, lead, and zinc Although they can be dredged, they cannot be used further. polyester nonwoven geotextile factory price is a commonly used material with a permeable structure for filtration and drainage. When filament nonwoven geotextile manufacturers are grafted with some biomolecules, heavy metals can be captured from contaminated water. M.Vandenbossche, etc.
The chitosan is grafted onto a polypropylene nonwoven high quality filament nonwoven geotextile to effectively capture metallic copper from the contaminated liquid. M.Vandenbossche et al. grafted cysteine onto polypropylene nonwoven filament nonwoven geotextile for sale to effectively capture metallic copper, lead and chromium.
5. Conclusion
filament nonwoven geotextile factory price (filament nonwoven geotextile for sale) are important varieties in industrial textiles, and they play an increasingly important role in civil engineering in countries around the world, such as water conservancy, roads, railways, seaports, and construction. With the continuous increase of industrial and infrastructure construction and transformation, China’s filament nonwoven geotextile manufacturers industry has begun to take shape, but it is still at a lower stage compared with the overall technical level and supporting standard system of advanced countries and regions such as Europe and the United States. To be in line with international standards, China must accelerate the introduction and development of related technologies and equipment, so as to absorb and re-innovate. National standards must be scientific and practical, advanced and mature, uniform and differentiated, serious and flexible. Contradictory and unified, in order to promote the standardization of China’s business operations and management, so that product quality reached a higher level.