Reinforcing concrete slab and roof using fiberglass reinforced carbon materials is one of the best methods of bending and shear strengthening of concrete slab, which has replaced the old steel and concrete methods in the past decade. Depending on the project conditions, this reinforcement can be performed at the bottom or on the slab in order to increase the positive or negative bending capacity.
For the first time in the country, Pekran Sazan Reinforcement Company solved the concrete slab problem that resulted from the designer’s error in calculating long-term flexibility, by using 300 grams of unidirectional fibers and 1.4 mm thick laminated FRP strips. The very high speed of work in this method has made employers interested in using FRP materials. Kubiax (Bubble Deck) concrete slab reinforcement and reinforcement
What is FRP?
FRP or fiber reinforced polymer is a kind of composite material which consists of two parts of fiber reinforcement and fiber covered with a resin matrix. This method has many applications in various construction industries, which can be used to strengthen engineering infrastructures such as water and chemical tanks, silos and cooling towers. FRP is composed of two materials: matrix and fiber, which is a matrix that contains some chemicals such as epoxy resin and polyester. These materials help a lot in reducing the cost and improving the mechanical, chemical and filler properties of the additives. The price and cost of implementing FRP is very economical.
The most important advantages of strengthening concrete slabs and ceilings using FRP
The fastest way to increase shear bending capacity
The best way to prevent cracks from spreading
Immediate and long-term reduction
Economical method compared to other methods
Methods of strengthening concrete slabs
Adding a steel beam
Use of FRP materials
Improve the performance of diaphragm slab
Domestic concrete slab repair
Increase slab thickness
Add a steel beam
This is one of the simple, effective and very useful ways to strengthen the concrete slab by adding steel column, which is easy to apply and does not increase the weight of the concrete slab, it is also effective in increasing the height of the concrete slab. Slab: Other advantages of adding a steel column are to reduce floor vibration and also create a reverse elevation to eliminate sagging and increase the diaphragm resistance of the floor.
Use of FRP materials
Another way to strengthen the slab is to use FRP materials. Using these materials with fibers instead of using traditional materials is a very effective method today. It has high tensile strength. You can place FRP materials in the form of strips or sheets on the surface under tension.
Improve the performance of the diaphragm slab
Improving the performance of the diaphragm is another way to strengthen the slab, as the slab is responsible for both carrying the vertical load and transferring the lateral loads.
Domestic concrete slab repair
To clean the concrete slab, you can use epoxy polymer materials and cement clay in the cracks. Also, we have to replace the rebar for concrete cracking and cracking. In this way, after removing the damaged material, we place a new stiffener and weld it to the other stiffener. New concrete should look like old concrete.
What is the purpose of strengthening slab structures?
Increased bending resistance of one-way slabs
Increased durability and longevity
Increased plasticity
Corrosion repair and strengthening
Increase difficulty
Increased bending resistance of one-way slabs
FRP application
FRP strengthening methods have many applications in various industries today. FRP can be used to strengthen and improve the seismic performance of concrete beams, concrete slabs, concrete columns, bridge foundations, foundations, underground pipe piles and many other things.
FRP is used to strengthen and resist worn-out structures, and it is also widely used in improving structures in earthquake-prone areas. Among its other uses, we can mention preventing corrosion phenomena against strong acids and increasing the life of structures.
Steps to triangulate FRP materials
Preparation before starting restoration and strengthening
Surface preparation
Installation steps
Mixing epoxy glue
Implementation of FRP system on the prepared surface
Surface preparation before restoration includes the following steps
Ambient temperature: Avoid installing materials at temperatures below 15 degrees Celsius and above 45 degrees.
Presence of moisture in the structure: The presence of moisture disrupts the adhesion of the lining resin layer to the surface of the structure. You should not start installing FRP when it is raining or when the humidity is high and there is a possibility of water particles leaking onto the surface of the structure.
Concrete surface conditions and sharp edges: Loose concrete must be removed from the surface before installing FRP, and the surface must be free of any materials such as paint, plaster, plaster and grease.
conclusion
Today there are many factors that cause concrete structures to undergo wear and tear, causing a lot of damage to the structures. To repair and strengthen these structures, there are methods that can be used to cover the damage, and the use of FR fibers is one of the methods that can be used to strengthen these structures, and it can be implemented.