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What kinds of geosynthetics are there
Geosynthetic materials in fact can be seen everywhere in our life, the range of geosynthetic materials is relatively wide, a lot of things are really dead Fan Tao of geosynthetic material, however, a lot of people don’t know who is belong to the geosynthetic materials, small make up to introduce you to what is now geosynthetic materials and geosynthetic materials has several kinds, In addition, various kinds of geosynthetics are introduced in detail. I hope that the introduction of xiaobian can help you to have a more comprehensive understanding of geosynthetics
What are geosynthetics?
Geosynthetics are used in geotechnical engineering and civil engineering construction, synthetic materials as raw materials made of various products. Because they are mainly used in geotechnical engineering, they are given the word “geo” and are called “geosynthetics” to distinguish them from natural materials.
Geosynthetics were once called geotextile and geomembrane. With the needs of engineering, there are new varieties of this kind of material, such as geogrid, geogrid and geogrid bag, geogrid pad, geogrid belt, composite geomemes, bentonite waterproof blanket, composite drainage net, etc., the original name can not accurately cover all products, so that in the following period of time, Call them “geotextiles, geomembranes and Related Products” (relatepyOCT). Obviously, such a name is not suitable as a technical or academic term. In 1997, at the fifth International Geosynthetic Conference in Singapore, the name of this kind of material was formally identified as “geosynthetics.”
The raw material of geosynthetics is polymer. They are made from chemicals extracted from coal, oil, natural gas or limestone, which are further processed into fibres or sheets of synthetic materials, and then made into various products. The main polymers of geosynthetic materials are polyethylene (PE), polyester (PET), polyamide (PER), polypropylene (PP) and polyvinyl chloride (PVC), chlorinated polyethylene (CPE), polystyrene (EPS) and so on.
How many kinds of geosynthetics are there?
Geotextiles
Another name for geotextiles is geotextiles. Early products are few, meaning a cloth material used in geotechnical work.
Geotextiles are made by processing polymer materials into silk, staple fibers, yarns or strips, and then into geotextiles of flat structure. Geotextiles can be divided into spun (woven) geotextiles and non-woven (nonwoven) geotextiles according to the manufacturing method. Woven geotextiles are made by interlacing two sets of parallel warp and weft threads that are either positively or diagonally intersected. Nonwoven geotextiles are made by processing fibers in directional or random arrangement. According to the different methods of connecting fiber, it can be divided into chemical (binder) connection, thermal connection and mechanical connection.
The outstanding advantages of geotextiles are light weight, good continuity of the whole (can be made into a larger area of the whole), convenient construction, high tensile strength, corrosion and microbial erosion resistance. The disadvantage is that without special treatment, low uv resistance, such as exposure, easy to aging by ultraviolet direct irradiation, but if not directly exposed, the anti-aging and durability is still higher.
Two. Geomembrane
Geomembranes can be generally divided into asphalt and polymers (synthetic polymers) two categories. Geomembrane containing asphalt, mainly compound (including woven or non-woven geotextiles), asphalt as a wetting binder. Polymer geomembrane, according to different main materials are divided into plastic geomembrane, elastic geomembrane and combined geomembrane.
A large number of engineering practice shows that the geomembrane has good water impermeability, strong elasticity and adaptability to deformation, can be applied to different construction conditions and work stress, has good aging resistance, the durability of the geomembrane under water and in the soil is particularly outstanding. Geomembrane has outstanding impermeable and waterproof properties.
PE composite geomembrane
1, density: density depends on the manufacturing material, even if the polymer manufacturing geomembrane belongs to the same category, there are often obvious differences. For example, polyethylene material can be divided into different categories such as ultra-low density, low density, medium density and high density, so that the density of PE geomembrane is different. The density range of geomembrane polymer is about 0./L~1./L, and the density commonly used in engineering is generally above 0.
2. Thickness: thickness refers to the distance from the top surface to the bottom surface of the film under normal pressure. For smooth geomemes (no embossed or patterned surface), the thickness of the measurement method is similar to that of geotextile thickness, but should be measured with a more accurate micrometer. Each sample should be measured at least three different positions, with the average as the thickness of PE composite geomembrane.
Above, small make up to you what is geosynthetic materials was introduced in detail, for the characteristics of geosynthetic materials as well as the change of composition and some nouns and origin are introduced, in detail all that, the concept of geosynthetic materials have more clear understanding, small make up also introduced three different types of geosynthetic materials, The characteristics of different kinds of geosynthetics are introduced in detail, as well as their respective uses. I hope that the introduction of xiaobian can help you better understand geosynthetics.
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