Geotextiles And Geomembranes In Civil Engineering
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can the national standard quality of composite geo-membrane be used for geotextile?
- no. composite geomembrane and geotextile are two different products, their function is not the same. Non-woven geotextile is woven into nets with long silk or short silk through different equipments ans technology, needling technology will make different fibers interwoven together, interwoven them and make the fabric standardization, making the fabric soft, rich, thick, hard to make different thickness satisfy the usage requiremants, non-woven geotextile has good fabric gaps and adhesive force, fibers are soft and has tear-resistance performance, also good deformation adaptability, good surface dewatering, it's surface is soft and multi-gap, also good friction coefficient, which will increase the adhesive force of soi particles, it can prevent little particles, losing surplus water while preventing the loss of particles, soft surface has good protective ability. it is divided into long fiber nonwoven geotextile filament or staple fiber nonwoven geotextile in accordance with the length, They can play a very good filtering, isolation, reinforcement, protection function and is a kind of widely used geosynthetics material.s
How to distinguish the quality of HDPE geomembrane?
- Orddinary people will find it very hard to distinguish its quality. You need to seek help form some authorized institutions to test the engineering data. Guodu building material testing center is an authorized HDPE geomembrane test institution. All the geomembrane used in international big projects is tested here.s
How is the power amplifier tone quality of thick membrane?
- Thick power amplifier tone quality is very good. It is widely used in high-end multimedia classrooms, training rooms, small meeting room or other simple amplification occasions. The microphone can be directly connected to frequency shift for power amplifier and can also effectively inhibit the whistle of microphone to loudspeaker box and support the background music for amplification.s
What's the method of adhering glass film to the window?
- For adhering glass film to windows, you should be careful at every step, otherwise the film will be crooked or crumpled. 1. Clean the glass. Wash the glass thoroughly to make sure there is no soft flocks, dust or sand on the glass. 2. Cut the glass film according to the size of the glass. 3. After cleaning the glass, spray some water on it. 4. And meanwhile spray some water on the glass film and protective film, and separate the protective film from the glass film. 5. Scrape the water between the glass film and the glass slowly, and trim off the excess glass film at corners.s
Why composite geo-membrane can not be used in underground garage?
- Composite geo-membrane was invented in China, applied in the The South-to-north Water Diversion Project with good anti-seepage effect. While there are no composite geo-membrane in foreign countries. It has also been widely used in subway tunnel and other underground constructions. Of course, it can be used in underground garage , but you must choose the appropriate specifications. It is recommended to use 300g/1.0mm/300g composite geo-membrane. The following are the details. Composite geo membrane is geotechnical impermeable material made of plastic film as anti-seepage material and non-woven fabrics. Its waterproof performance mainly depends on the performance of plastic film. Impermeable plastic film at home and abroad are mainly polyvinyl chloride (PVC) and polyethylene (PE), which are Polymer chemistry flexible material with smaller proportion, good extensibility and high adaptability to the deformation. Corrosion resistance, low temperature resistance, good anti-frost property. The main mechanism is to block earth dam leakage passage by imperviousness of plastic film and bear hydraulic pressure and adapt to deformation of dam with greater tensile strength and elongation. Non-woven geotextile is also a kind of macromolecule staple fibre chemical material shaped through acupuncturing or hot sticking, having high tensile strength and extensibility. Combined with plastic film, it can not only increases the tensile strength and anti-puncture ability of plastic film, but also increase the friction coefficient of contact surface and make the composite geo-membrane and packaging layer stable as the non-woven fabrics surface becomes rough. At the same time, they have good corrosion resistance to bacteria and chemical action, not afraid of acid, alkali, salt erosion, high seepage coefficient.s
Is it safty to use the infrared electrothermal film floor heating?
- Electrothermal membrane floor heating is composed of temperature controller, connecting conducting wire, connection card, auxiliary insulation, insulation materials, electric heating film and finishing materials. The power is connected with the electrothermal film and temperature controller by the wire, so the indoor temperature can be controlled freely between 0-35 degrees. Because the electrothermal film is pure resistance circuit, the electric energy can be transformed into heat energy with high efficiency, it can release the heat and generate far infrared waves, which are beneficial to the human body. Electrothermal membrane heating is one of the advanced heating methods in the world. It is a new type of heating method, which is based on the infrared radiation to transfer the heat. The main body of low temperature radiation heating system: The electrothermal film is a kind of semitransparent polyester film which can be heated by electricity. it has high pressure resistance, humidity resistance, wide temperature range, high toughness, low shrinkage rate, safe operation, easy storage and transportation and other excellent performance.s
What is the difference between the mica electrothermal film and electric thermal dissipation film?
- There are many kinds of electric heating system, in which the electrothermal film products can be divided into metal film, polymer film, printing oil film and carbon fiber membrane.
These can be installed in the ground. Besides, there is a better electric heating system, namely the non-magnetic heating cable. The service life of it is 50 years and it can used under cement layer. Only floor or floor leather can be laid on the electrothermal film. The best way to reach the required body temperature is that the foot is warm and the head is cool, so electrothermal film is better in accordance with heating comfort and heating perfromance. In terms of electric quantity it mainly depends on heat peservation effect of your house. As for the heat peservation effect, all of them are the same.s
What is the film sticking process for computer screen?
- 1. First, tool material preparation: Usually the essential materials for sticking film for computers include: Hard card (ID card, bank card or other hard cards), cleaning solution, wide adhesive tape, wiping cloth, film and computer. Among which,the wiping cloth should be made of materials with good flexibility, which can effectively prevent scratches when wiping the computer screen. 2, wipe the screen with wiping cloth along one direction to clean the dirt and dust on the screen. 3. Uncover the fim and observe carefully, you will find that film is composed of three layers, among which the topmost layer is used for protection and the middle layer is the real film. At this time, uncover the topmost layer. 4 and then slightly uncover the bottom layer, stick on computer screen in corresponding position, take out the bottom layer continuously at the same time. 5, the next step is the most important part, namely eliminate the bubbles in computer film. Stick the hard card closely on the top of the film, priority processing the relatively large bubble during promoting course, slowly push the bubbles to to the edges of computer screen, and then squeeze out the gas. Push toward the nearest place from the edge when pushing. 6, finally squeeze the upwarped parts around the film to ensure that the film is closely integrated with the computer screen. At the same time, if the film contains dirt or dust, they also need to be cleaned up in this step.s
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