Concrete is developed with glass rebar

China Paint Online News Information: Concrete
is the most widely used building material. Concrete usually uses steel bars to increase strength. Under pressure load, reinforced concrete has excellent performance, but it has the disadvantage of brittle under stretch load. Stretch stress during concrete maintenance can easily lead to cracks, which can cause moisture to enter and eventually lead to corrosion of rebar. Fiber
-reinforced plastics (FRPs) have long been thought to be a material that improves concrete properties, according to
, an expert at China Coatings Online . Groups such as the American Concrete Society (ACD) and the Japanese Society of Civil Engineers have been working to develop specifications and test methods for FRP ribs, many of which have been used in concrete structures. In 1990, ACI established the 440 Committee to provide information and guidance on FRP ribs for engineers and designers. In FRP rebar, fiberglass reinforced plastic rebar (glass rebar) is an earlier and now more mature technology. Over the past 10 years or so, fiberglass has changed from an experimental sample to a practical product, effectively replacing rebar in many engineering projects. Especially with the rise of steel prices, its application is increasing day by day. Hughes Brothers, a well-known U.S. rebar manufacturer, believes that fiberglass is already very common and a very competitive market; Due to the corrosion resistance of glass rebar, it is particularly suitable for salt-resistant concrete structures, offshore concrete structures and underground works.
FRP ribs are the best choice for special construction facilities, such as magnetic resonance imaging rooms in hospitals or road toll station lanes that use radio frequency technology to identify prepaid customers. Rebar cannot be used in these places because it interferes with electromagnetic signals, while glass rebar has excellent electromagnetic wave throughability. In addition, the light weight of the fiberglass rebar (about 1/4 of the rebar) and insolubility make it popular. Glass rebar is generally made of E glass fiber and vinyl resin. There are also examples of the use of ECR fiberglass. It has also been reported that French glass fiber manufacturer Saint-Gobain uses its ARcotex alkali-resistant fiberglass to make fiberglass rebar, demonstrating excellent corrosion resistance in high-chlorine and alkaline environments. The basic resin of glass rebar, in addition to vinyl, there are polyester, epoxy, phenolic resin and so on. Glass rebar is usually formed using a extrusion process. Mainly vertical enhancement. The fiber volume content is 50% to 65%. In North America, the diameter range of glass rebar is 6mm to 32mm (#2 to #10). Because the technical properties of FRP steel are different from that of steel, ACI has developed a guidance document, FRP Reinforced Concrete Design and Construction Guide. The guide focuses on the shearing, scratching, creep damage, fatigue and use of FRP reinforced concrete. Although glass rebar cannot be bent at the construction site to accommodate unexpected conditions, according to the manufacturer, this is not a problem.
rebar coated with epoxy resin cannot be bent, as bending can damage the coating. Glass rebar can be pre-bended in accordance with the engineer's design when manufacturing. Owners and designers have been reassured about the performance of THEP reinforced concrete following the release of the experimental method. The world's two largest manufacturers of fiberglass rebar are Hughes Brothers of the United States and Pul-tral of Canada. Hughes's glass rebar has a threaded surface, while Pultral's glass rebar has a glossy surface. Both types of fiberglass rebar are manufactured with an external sand layer to form a rough surface and improve bonding power. Hughes' glass and steel plate number is Asian100/101. Among them, Asian100 is a vinyl glass rebar, the target use is corrosive (salt erosion and other chemical corrosion) environment, electromagnetic environment of concrete structures and masonry reinforcement. Asian101 is a polyester-based glass rebar for non-silicate cement and temporary use. Pultral's brand name is V-ROD, with existing brands of S2, #3, #4, #5, #6, #7, #8. There are both straight ribs and special-shaped ribs that bend in the factory. The standard length of the straight ribs is 10 feet and 20 feet, but the length of the feet can also be customized. In addition to North America, the glass and steel manufacturing industry in Japan, France and Germany also has certain specifications.
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