Glass Fiber Reinforced Concrete
Glass fiber reinforced concrete is a special type of concrete , which contains binder cement, polymers material, and glass fibers which are reinforce in the cementcious mixture. These concrete properties are improved by the glass content, mix design, and production of casting process. GFRC is basically used for external applications for aesthetic appearance.
Glass fiber reinforced cement concrete is special concrete material which utilizes glass fibers as reinforcement purpose, as a supplement of steel. Glass fibers are totally resistant from alkali. Alkali protective glass fiber is used widely as it has a better resistant properties to the environmental action. GFRC is mixed composition of cement, glass fibers, and polymer compound. The benefit is the glass fibers does not rusted like steel. Composite weight of thin and hollow GFRC sections produced is comparatively lesser than the conventional pre-cast concrete. The GFRC characteristics will be variable by the concrete glass reinforcement spacing, and the concrete reinforcement mesh type.
Advantages of GFRC
GFRC is used for several applications, there are various advantages of using GFRC, as discussed below,
- GFRC is prepared by minerals and will not decay easily. Whenever exposed to a burning flame, the GFRC act as a thermal regulator and protect the materials from the flame heat.
- Weight of materials are comparatively light compared to the conventional concrete materials. The application and installation is fast, easy and basically simple. GFRC may be produced as thin sections or layer.
- GFRC can be cast to in any shape or structure.
- High strength concrete can be achieved by using GFRC, also tough and resistant to crack and fracture, and high ratio of strength – weight. So, the GFRC are durable and light compared to other concrete.
- Good compaction of mix is achieved when GFRC is sprayed, without use of any vibrations.
Features of GFRC
Characteristic strength of GFRC is achieved due to high content of alkali resistant glass fibers and acrylic polymer compound. The cement content are very high, and the ratio of water – cement is low, so as a result the GFRC strength under compressive load is high and also possess good tensile and flexural strength. Used fiber must be hard to ensure the provision of required concrete tensile strength. Then, the performance of these concrete is better than the normal concrete. These fiber carry the tensile loads, and the concrete is much flexible due to the polymers. Now the physical properties of GFRC are much better than any non-reinforced concrete. Though, GFRC is not substitute as reinforced concrete if applied loads are heavy. GFRC are best suitable option for light load concrete.
Glass fibre is basically 200-400 isolated filaments, available in bounded form as stand. Small pieces of stand of various lengths is used for a various applications. Prime engineering application of glass fibres is cement concrete or mortar matrices reinforcing, used for thin-sheet concrete manufacture. Ideal mixing techniques for concrete only allow about 3% of fibres of a length of 25mm e glass may be used. Polymers can be added in the glass fibre mixes to improve physical properties of GFRC.
Difference between GFRC and Precast Concrete
The elastic nature and bulk density of the GFRC is greater than any precast concrete. Cement and sand ratio for GFRC is approximately 1:1, in case of precast concrete it is 1:6. The glass fibres is added to reinforce the concrete for gain comparatively greater impact on strength and low permeability to water and air than any precast concrete.