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APPLICARION OF GLASS FIBER REINFORCED CONCRETE
Glass fiber reinforced concrete is a kind of special concrete which can be improved, the bending resistance and the compression ratio of concrete are improved by the uniform dispersion of certain glass fiber in the concrete matrix.
Glass fiber reinforced concrete according to different types of fibers are generally classified for steel fiber reinforced concrete, glass fiber reinforced concrete and carbon fiber reinforced concrete, glass fiber reinforced concrete is developed earlier application of a fiber reinforced concrete. Due to the hydration of Portland cement produced a large number of Ca (OH) 2, so that the concrete is a strong alkali, glass fiber is often caused by alkali corrosion and brittle, so that the toughness and flexural strength of concrete decreased severely. The alkali resistance of glass fiber has been improved by replacing common glass fiber with alkali resistant glass fiber as reinforced material. At present, the glass fiber reinforced concrete used in various countries is generally used as the raw material of alkali resistant glass fiber and low alkali cement.
Glass fiber reinforced concrete raw materials: alkali resistant glass fiber.
Alkali resistant glass fiber is zirconium oxide, titanium dioxide and other elements are added in the chemical composition of glass fiber, so as to improve the glass fiber alkali corrosion resistance ability.
The role of zirconia and titania: 1.addition of zirconium oxide, and titanium oxide in the glass fiber chemical composition, main function is zirconium and titanium elements such as adding glass fiber in the silica structure more perfect, less activity, thereby reducing the glass fiber and alkaline chemical reaction of possibility, increase the ability of anti - alkali glass fiber. 2. You can also be in the glass surface coated with a layer of resin or glass fiber after some special dipping treatment, the surface of glass and alkali isolation, not only the alkali erosion surface of glass fiber, but also to prevent the Ca (OH) 2 crystal growth on the surface of glass fiber, thus increasing the alkali resistance of glass fiber.
Construction technology of glass fiber reinforced concrete
The key of the construction technology of glass fiber reinforced concrete is how to make the glass fiber distribute evenly in the concrete. Therefore, the construction of concrete construction technology has great difference from the traditional. At present, the construction technology used at home and abroad:
1 mixed molding method
This method is first cement, sand in the mixer dry, stir evenly, tackifier dissolved in a small amount of mixing water (accounting for the total mixing water about 1%), then the short cut glass fiber dispersion to tackifier water, again with the mixing water also added to the sand cement mixture, while stirring until uniform. Mixed concrete material into the mold and layered tamping layer, each layer thickness of more than 25mm. Ramming should use flat plate vibrator. The surface finishing film covering 25h (curing temperature is greater than or equal to 10 degrees Celsius). Release. Demoulding at RH>10 degrees Celsius under the condition of curing 7-8 days can be used.
2 pressing method
Pressing method is in ready mixed molding method based, after casting one side or both sides of the template by (such as fiber felt, the felt paper) membrane vacuum dewatering by filtration, to reduce the forming of concrete in water, in order to increase the strength of concrete, but also can shorten the release time. Because the vacuum dehydration, so to increase liquidity in the mixing of mixture can increase the water cement ratio.
3 injection molding method
In ready when appropriate to increase the water cement ratio to improve the fluidity of the mixture, and then pumping and pouring pound is shaped in a closed abrasive. The concrete special use and production of complex shapes.
4 direct spray method
Direct spray method is the use of mechanical injection machine for the construction of the specialized construction. Construction of two nozzle, a spray chopped glass fiber and a jet mixing cement mortar, and the ejection of the short cut fiber and atomization of the cement mortar in the mixed space splashed into the molding tool. After reaching certain thickness, pressure roller or vibration grinding compaction, in plastic film mulching, demoulding after 20h above for conservation of nature (curing temperature is greater than or equal to 10 Celsius degrees) and under the conditions of relative humidity of 90% of the maintenance for 7 days. Such as the use of steam curing 6-8h, maintenance after the mold 3-4 days in RH>90%D environment with relative humidity.
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