- Glass Fibre Reinforced Concrete Project Report Pdf
- Glass Fiber Reinforced Concrete Panels
- Glass Fiber Reinforced Concrete Pdf Free
- Glass Fiber Reinforced Cement
Glass fiber reinforced concrete or GFRC is a type of fiber-reinforced concrete. The product is also known as glassfibre reinforced concrete or GRC in British English.[1] Glass fiber concretes are mainly used in exterior building façade panels and as architectural precast concrete. Somewhat similar materials are fiber cement siding and cement boards.
Fiber-Reinforced Concrete Professor Kamran M. Nemati Winter Quarter 2015 3 Concrete Technology 5 Fiber-Reinforced Concrete (FRC) Concrete containing a hydraulic cement, water, fine or fine and coarse aggregate, and discontinuous discrete fibers is called fiber-reinforced concrete(FRC). It may also contain pozzolans and other. Made of steel fiber reinforced concrete. In the future, structural glass fiber reinforced concrete shall provide a simple and visually appealing alternative to conventional steel bar or steel fiber reinforced concrete. The glass fibers can also be used in combination with conventional reinforc- ing bars or mat reinforcements. Attempting to develop high performance concrete with the use of glass fibers as well as admixtures. While the combination of fly ash, alkaline liquids, fine and coarse aggregate and glass fibers resulted in the product called as Glass Fiber Reinforced Geopolymer Concrete (GFRGC). Fiber-Reinforced Concrete (FRC) Seminar and PPT with pdf report: Fiber-Reinforced Concrete (FRC) is concrete consisting fibrous material which increases its structural purity. It holds short discrete fibers that are uniformly distributed and circumstances oriented.This page contains Fiber-Reinforced Concrete (FRC) Seminar and PPT with pdf report.
- 1Composition
- 2Properties
Composition[edit]
Glass fiber-reinforced concrete consists of high-strength, alkali-resistant glass fiber embedded in a concrete matrix.[2] In this form, both fibers and matrix retain their physical and chemical identities, while offering a synergistic combination of properties that cannot be achieved with either of the components acting alone. In general, fibers are the principal load-carrying members, while the surrounding matrix keeps them in the desired locations and orientation, acting as a load transfer medium between the fibers and protecting them from environmental damage. The fibers provide reinforcement for the matrix and other useful functions in fiber-reinforced composite materials. Glass fibers can be incorporated into a matrix either in continuous or discontinuous (chopped) lengths.
Durability was poor with the original type of glass fibers since the alkalinity of cement reacts with its silica. In the 1970s alkali-resistant glass fibers were commercialized.[1] Alkali resistance is achieved by adding zirconia to the glass. The higher the zirconia content the better the resistance to alkali attack.[3] AR glass fibers should have a Zirconia content of more than 16% to be in compliance with internationally recognized specifications (EN, ASTM, PCI, GRCA, etc).
Laminates[edit]
A widely used application for fiber-reinforced concrete is structural laminate, obtained by adhering and consolidating thin layers of fibers and matrix into the desired thickness. The fiber orientation in each layer as well as the stacking sequence of various layers can be controlled to generate a wide range of physical and mechanical properties for the composite laminate. GFRC cast without steel framing is commonly used for purely decorative applications such as window trims, decorative columns, exterior friezes, or limestone-like wall panels.
Properties[edit]
The design of glass-fiber-reinforced concrete panels uses a knowledge of its basic properties under tensile, compressive, bending and shear forces, coupled with estimates of behavior under secondary loading effects such as creep, thermal response and moisture movement.
There are a number of differences between structural metal and fiber-reinforced composites. For example, metals in general exhibit yielding and plastic deformation, whereas most fiber-reinforced composites are elastic in their tensile stress-strain characteristics. However, the dissimilar nature of these materials provides mechanisms for high-energy absorption on a microscopic scale comparable to the yielding process. Depending on the type and severity of external loads, a composite laminate may exhibit gradual deterioration in properties but usually does not fail in a catastrophic manner. Mechanisms of damage development and growth in metal and composite structure are also quite different. Other important characteristics of many fiber-reinforced composites are their non-corroding behavior, high damping capacity and low coefficients of thermal expansion.
Glass-fiber-reinforced concrete architectural panels have the general appearance of pre-cast concrete panels, but differ in several significant ways. For example, the GFRC panels, on average, weigh substantially less than pre-cast concrete panels due to their reduced thickness. Their low weight decreases loads superimposed on the building’s structural components making construction of the building frame more economical.
Sandwich panels[edit]
A sandwich panel is a composite of three or more materials bonded together to form a structural panel. It takes advantage of the shear strength of a low density core material and the high compressive and tensile strengths of the GFRC facing to obtain high strength-to-weight ratios.
GFRC sandwich panels at Public Library Lope de Vega in Tres Cantos, Madrid
The theory of sandwich panels and functions of the individual components may be described by making an analogy to an I-beam. The core in a sandwich panel is comparable to the web of an I-beam, which supports the flanges and allows them to act as a unit. The web of the I-beam and the core of the sandwich panels carry the beam shear stresses. The core in a sandwich panel differs from the web of an I-beam in that it maintains a continuous support for the facings, allowing the facings to be worked up to or above their yield strength without crimping or buckling. Obviously, the bonds between the core and facings must be capable of transmitting shear loads between these two components, thus making the entire structure an integral unit.
The load-carrying capacity of a sandwich panel can be increased dramatically by introducing light steel framing. Light steel stud framing is similar to conventional steel stud framing for walls, except that the frame is encased in a concrete product. Here, the sides of the steel frame are covered with two or more layers of GFRC, depending on the type and magnitude of external loads. The strong and rigid GFRC provides full lateral support on both sides of the studs, preventing them from twisting and buckling laterally. The resulting panel is lightweight in comparison with traditionally reinforced concrete, yet is strong and durable and can be easily handled.
References[edit]
- ^ ab'Glass Fiber Reinforced Concrete'. The Concrete Network. Retrieved 21 September 2016.
- ^Ferreira, J P J G; Branco, F A B (2007). 'The Use of Glass Fiber-Reinforced Concrete as a Structural Material'. Experimental Techniques. 31 (May/June 2007): 64–73. doi:10.1111/j.1747-1567.2007.00153.x.
- ^'AR Glass Fiber Products'. Nippon Electric Glass America. Retrieved 21 September 2016.
External links[edit]
Retrieved from 'https://en.wikipedia.org/w/index.php?title=Glass_fiber_reinforced_concrete&oldid=900095982'
- Casting of GFRC
Fiberglass is basically a matrix in which very fine fibers of glass exists. Fiberglass material is usually used for making of boats or for temporary sheds like sometimes on the roof tarus. That is the reason where ever the word fiber glass is touched ones always thinks of it as insulation boards or boats etc. In fiber glass a reinforced plastic-glass polymer is mixed in a polymer and if instead of that polymer one uses the portland cement and sand, then the resultant material will be known as glass fiber reinforced concrete.
What is Glass Fiber Reinforced Concrete?
GRC (Glass Reinforced Concrete) or GFRC (Glass Fiber Reinforced Concrete) basically consists of a cementitious matrix composed of cement, sand, water, and admixtures, in which short length glass fibers are dispersed. According to Bentur and Mindess1 this dispersion will lead to an increase in the tension and impact strength of the material.
Invention of Glass Fiber Reinforced Concrete
One of the Basic hurdle behind development of this Glass Fiber Reinforced Concrete was the alkaline nature of the concrete. We have discussed many times about Alkali-Silica Reaction in which the reactive silica of aggregate it reacts with the alkaline nature of the cement sand matrix. And on that note, you must also be aware of the fact that glass breaks down completely in an alkaline environment – its durability is like nothing in such an environment. However this problem was solved when Alkali-Resistant Glass (AR Glass) was developed by Owens-Corning and by nippon Electric Glass leading to a rapid increase in applications.
The idea of mixing of glass and concrete was of the fact fibers are the principle load-carrying members while the surrounding matrix keep them in the desired locations and orientations. These fibers provide reinforcement to the concrete matrix and thus provide a very useful combination of properties that cannot be achieved with either of the components alone.
Glass Fiber Reinforced Concrete was first created in 1940 by Russia but was not of the shape we used now until 1970s. Just like regular concrete, GFRC can accommodate a variety of artistic shapes. It can be etched, polished, sandblasted and stenciled.
Glass Fiber Reinforced Concrete was first created in 1940 by Russia but was not of the shape we used now until 1970s. Just like regular concrete, GFRC can accommodate a variety of artistic shapes. It can be etched, polished, sandblasted and stenciled.
![Reinforced Reinforced](https://webstore.ansi.org/cover-pages/small/ASTM/ASTM+C947-99.jpg)
Glass Fibre Reinforced Concrete Project Report Pdf
General Benefits in Society
Glass fiber Reinforced Concrete is a material which today is making a significant contribution to the economics, to the technology and to the aesthetics of the construction industry worldwide.
It is environmental friendly composite, due to its low consumption of energy and natural raw materials formed in to a great variety of products and has won firm friends amongst designers, architects, engineers and end users for its flexible ability to meet performance, appearance and cost parameters.
It is environmental friendly composite, due to its low consumption of energy and natural raw materials formed in to a great variety of products and has won firm friends amongst designers, architects, engineers and end users for its flexible ability to meet performance, appearance and cost parameters.
Specific Technical Benefits of GFRC
There are a lot of benefits to use thin sections of GFRC (Glass Fiber Reinforced Concrete) :-
- Light Weight Construction due to thinner sections and being 75 % more light weight than similar pieces cast with traditional concrete.
- Higher Strength: can achieve upto 4000 psi flexural strength and high strength to weight ratio
- No Need of Reinforcement: As in complex shapes the reinforcement can’t be fixed like in 3d structures than in such cases glass fiber reinforced concrete is best.
- No vibration is needed as compared to the conventional concrete
- It has high quality surface finish and no voids exists on top
- It is highly durable and sustainable concrete
- It might be more expensive initially but overall due to thin sections the cost is lesser
The Facade of the Building with GFRC |
Casting of GFRC
Glass Fiber Reinforced Polymer Concrete can be poured or casted in the desired shapes by following three methods :-
1. Spray-UP
![Advantages of glass fiber reinforced concrete pdf Advantages of glass fiber reinforced concrete pdf](https://i1.rgstatic.net/publication/279937941_Toughness-durability_of_glass_fiber_reinforced_concrete_systems_ACI_Mater_J/links/55c28b2c08aeca747d5dd185/largepreview.png)
Like shortcrete you can spray-up GFRC like a fluid in to the formwork. Using specialized guns the GFRC is sprayed.
Glass Fiber Reinforced Concrete Panels
2. Premix
In this case short fibers are mixed into the fluid concrete mixture and then is poured into the formwork as desired.
3. Hybrid
Glass Fiber Reinforced Concrete Pdf Free
One final option for creating GFRC is using a hybrid method that uses an inexpensive hopper gun to apply the face coat and a handpacked or poured backer mix. How to compress a pdf file. A thin face (without fibers) is sprayed into the molds and the backer mix is then packed in by hand or poured in much like ordinary concrete. This is an affordable way to get started, but it is critical to carefully create both the face mix and backer mix to ensure similar consistency and makeup. This is the method that most concrete countertop makers use.