There are numerous kinds of concrete reinforcing fibers, which commonly confuse people and impact their optimal strengthening effect. Actually, these fibers can be divided into four groups: synthetic fibers, metal fibers, mineral fibers and plant fibers. Each kind of fiber has its unique application area and reinforcing result.
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1. Synthetic Fiber
It is processed from many plastics, which are mainly divided right into 2 classifications: crack-resistant fibers and strengthening fibers. Strengthening fibers include in a comparable technique to steel fibers and are created to enhance the resilience of concrete and mortar.When it is essential to create a rugged and dense grid comparable to steel bars, toughening fibers with a high fiber material are chosen; so a great grid is needed, the fiber content can be appropriately reduced, or regular toughening fibers can be selected. Although the strengthening effect of artificial fibers is somewhat substandard to that of steel fibers, they have great dispersibility, safe building and construction without irritability, and no rust issues, so they have been widely utilized in decoration and outside surface area engineering. Amongst them, regular toughening fibers made from polypropylene are often used in mortar products.
High-performance toughening fibers play a crucial function in ultra-high-performance concrete (UHPC) and high ductility concrete (ECC). These fibers primarily include Shike high-performance polypropylene microfiber, polyvinyl alcohol fiber and ultra-high molecular weight polyethylene fiber. Shike high-performance polypropylene microfiber is known for its special microfiber design and very easy diffusion qualities. It has an optional size and a size of 0.15 mm. It not just has little effect on the fluidness of concrete but also can be 50-100% more affordable than various other fibers with the very same reinforcement result. Nonetheless, as micron-level fibers, polyvinyl alcohol fiber and ultra-high molecular weight polyethylene fiber have greater diffusion obstacles and are pricey, and a lot of them rely on imports.
Anti-crack fibers, particularly early-stage anti-crack fibers, are important to the performance of concrete after pouring. Such fibers can considerably enhance the split resistance of concrete, subsequently enhancing its resilience. In ultra-high performance concrete (UHPC) and high ductility concrete (ECC), anti-crack fibers give tough safety and security for concrete using credible diffusion and support.
The anti-cracking outcome within 1 day is essential. As quickly as the durability of the concrete is developed, the influence of this sort of fiber will gradually weaken.At present, the most extensively utilized fibers in China are polypropylene fibers and polyacrylonitrile fibers, and their dose is typically 1-2 kilograms per cubic meter of concrete. These 2 fibers are budget-friendly because they are made from faster ways of thread used to make clothing, such as polypropylene fiber, which is polypropylene yarn, and polyacrylonitrile fiber, which is acrylic yarn. The market rate is about 12,000 yuan per lot. Nevertheless, there are additionally lower-priced fibers on the marketplace, regarding 7,000 yuan per heap. These fibers are typically made from waste clothing silk, with a wetness content of as much as 30-50%, or blended with other polyester fibers or glass fibers, and the high quality varies.
Anti-crack fibers have a wide variety of applications. In outdoor jobs, specifically in severe atmospheres such as solid winds and heats, concrete is susceptible to splitting because of shrinkage. At this time, adding anti-crack fibers will considerably boost its sturdiness. On top of that, for the manufacturing of components that are maintained indoors or at high temperatures, the efficiency of concrete after putting can likewise be improved by anti-crack fibers.
Suppose the concrete can be well treated within 24 hours after pouring. Because case, there is really no need to add additional anti-cracking fibers. On top of that, polypropylene fibers also play an essential function in fire protection engineering. Because the fibers will melt throughout a fire, they give a reliable way to get rid of water vapor from the concrete.
2. Metal Fiber
Among steel fibers, steel fiber is the primary element, and stainless steel fiber is in some cases utilized. This fiber can properly enhance the compressive and flexural stamina of concrete, and its strengthening effect is far better than various other types of fibers. Nonetheless, steel fiber additionally has some significant imperfections, such as high price, difficulty in diffusion, feasible pricking during construction, feasible corrosion on the surface of the item, and the risk of corrosion by chloride ions. For that reason, steel fiber is typically used for architectural support, such as bridge development joints and steel fiber flooring, however is not ideal for attractive parts. In addition, steel fiber is divided into several grades. The rate of low-grade steel fiber is more economical, however the reinforcing result is far much less than that of state-of-the-art steel fiber. When picking, it is needed to make a cost effective suit according to real needs and budget plan. For the particular classification and quality of steel fiber, please describe the suitable nationwide criteria and sector requirements for comprehensive details.
3. Mineral fiber
Lava fibers and glass fibers represent mineral fibers. Lava fibers are an optimal option to steel fibers in high-temperature concrete environments where steel fibers can not be made use of due to their excellent heat resistance. Glass fibers are a key element of standard glass fiber concrete (GRC) because of their playability. However, it should be noted that these two mineral fibers are prone to rust in silicate cement, particularly after the fiber stops working; a lot of cracks might create in the concrete. For that reason, in the application of GRC, not only alkali-resistant glass fibers need to be chosen, but additionally low-alkalinity concrete needs to be used in mix. In addition, mineral fibers will substantially decrease the fluidity of concrete, so GRC is generally put making use of fiber splashing contemporary innovation instead of the standard fiber premixing technique.
4. Plant Fiber
Plant fiber is acknowledged for its environmentally friendly home or service structures, yet it is inferior to numerous other fiber enters concerns to resilience and support influence.Its individuality hinges on its excellent water retention, that makes it play a crucial role in the production procedure of concrete fiberboard and calcium silicate fiberboard. There are numerous types of plant fibers, consisting of pulp fiber, lignin fiber, bamboo fiber, and sugarcane bagasse, a lot of which are stemmed from waste use and are an important element of environmentally friendly concrete.
Please understand that the in-depth description of steel fiber, mineral fiber and plant fiber may not be specialist and extensive. If you have any questions or require further info, please feel free to call us for corrections and supplements.
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