Since the s, post-tensioning concrete has grown in popularity. Whether you&#;re trying to streamline the building process, reduce costs or give a structure the best chance of surviving weather hazards, there are numerous benefits of post-tension slabs.
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Here&#;s a look at some hidden advantages of post-tensioning concrete and why you should consider these methods for new structures.
Post-tensioning concrete is the process of adding steel bars (tendons) below a mixture&#;s surface. Once the concrete fully cures, tension is applied to the steel bars. These reinforcements introduce stress to the concrete, which can prevent cracks and shifting down the road.
Construction teams rely on post-tensioning methods to help concrete reach its strongest state. This process is efficient for creating surfaces that can withstand the loads required for a newly developed structure.
Consider these surprising advantages of post-tensioning.
Prestressed concrete supports larger loads compared to traditional pouring. Using post-tension methods means concrete substrates are thinner, sometimes by as much as 20%.
When a building is complete, the total height of the structure is shorter than constructing slabs without post-tension reinforcements. Smaller buildings call for teams to use less cladding, concrete, cement and shear. Extra materials can be used for future projects or returned to the manufacturer to increase your bottom line. Either way, you&#;ll save on costs and materials.
When you rely on post-tensioning concrete methods, fewer materials are involved in the final structure. This includes the amount of cement used to create concrete mixtures &#; a significant source of carbon emissions.
It&#;s possible the timeline for a building project will be shorter with post-tensioning concrete, which lessens the amount of time gas-powered tools and vehicles run from the start of the assignment through completion.
The setup for post-tension procedures can be done quickly without the variables of traditional curing. The fact that crews spend less time laying steel supports means teams will be ready to pour mixtures and let the concrete dry on an impressive timeline. Your post-tension building project can progress consistently.
Post-tensioning results in compressive stress in concrete, which helps to reduce the effects of shrinkage and temperature changes that can cause cracking. The post-tensioning system consists of steel strands that are tensioned after the concrete has hardened, creating internal forces that resist external loads.
Post-tensioning systems are effective for crack control because the tendons act as reinforcement for the concrete and prevent it from splitting apart. The tendons are anchored at both ends of the concrete member and are usually placed in ducts or sleeves to allow them to move freely during tensioning.
The tendons are tensioned by hydraulic jacks and then locked in place by wedges or nuts at the anchorages. The tension in the tendons induces a compressive stress in the concrete, which counteracts the tensile stress caused by shrinkage or bending. This way, the concrete remains relatively crack-free and watertight throughout its service life.
Many property owners building post-tension structures find surfaces do a fantastic job of limiting unwanted vibration and sag. Inside the poured concrete, cables help to balance the load.
Rather than the center of slabs being put under immense stress where they can crack, the internal cables take care of the heavy lifting. Over time, concrete maintains its shape and refrains from dipping downward when objects are placed on top of it.
STRUCTURAL TECHNOLOGIES provides VSL post-tensioning products as well as construction systems in the United States. Whether you want to build or repair a commercial building, parking lot or similar structure, we will assist with design, installation and material fabrication for unbonded monostrand post-tension systems, bonded multistrand post-tension systems, shear reinforcements, barrier cables and lockable dowels.
We specialize in external and internal post-tensioning technology. STRUCTURAL TECHNOLOGIES provides you with solutions for installations outside a structural element &#; within grouted ducts &#; or within an existing member &#; via core drilling &#; to handle the scope of your project.
To learn more about post-tensioning products and our service capabilities, submit a contact form with STRUCTURAL TECHNOLOGIES.
Post-Tension Slabs of the advantages and disadvantages of using post tensioning in reinforced concrete slabs?
Post Tension Slab
Although concrete is a strong material for construction, it is not resistant to breakdown especially where longer concrete slabs are required like in a bridge or a length of a beam. For this, the concrete slab is tensioned with a process called pre-stressing and the slab of concrete which comes out after this process is known as post tension slab. This slab is much stronger as well as more durable than the normal concrete slabs. In today&#;s world, where the modern engineering is finding new ways to build longer, more efficient and stronger structures, post tension slab becomes one of their chief requirements. There are many advantages and disadvantages of post tensioned slabs which we will discuss in this post.
Advantages of Post Tension Slab
Post tension slabs are advantageous in many ways. Some of the major benefits of post tension slabs are as follows.
1. Reduced cost: Post tension slabs are excellent ways to construct stronger structures at an affordable price. There are many structures like parking garages as well as stadiums, since they are required to hold much more weight than average buildings, this slab becomes a viable option.
2. Flexibility in design: The designs made with this slab are sleek, require lesser space and give way to dynamic contours. All this makes them ideal for the expression of creativity in the building design.
3. Lesser usage of materials: Since the post tension slab is thin, the materials used with it are also lesser. Be it the thin beams, walls or supporting pillars of buildings, this compact concrete slab does not need bulky materials.
4. Durability: Being a very strong substitute of the normal concrete, it lasts longer.
Disadvantages of the post tension slab
Here are a few disadvantages of post tension slabs:
1. Since there are a number of tendons and wires spread inside the post tension slab, it can result in corrosion. But largely, this tendency to corrode depends on the quality of the material used.
2. Complexity of work: The post tension slab can be made only by skillful professionals. The local workers may not have the necessary skills required to prepare this complex slab.
3. Poor workmanship can lead to accidents: The main problem with using post tension slab is that if care is not taken while making it, it can lead to future mishaps. Many a times, ignorant workers do not fill the gaps of the tendons and wiring completely. These gaps cause corrosion of the wires which may break untimely, leading to some untoward events.
The post tension slab is one of the building blocks of the modern architecture and builders cannot think of making skyscrapers, longer bridges and marvelous structures without using it. A skilled and experienced work is one of the key requirements while making these slabs, on the other hand, carelessness in the manufacture process may lead to disastrous results.
Although concrete is a strong material for construction, it is not resistant to breakdown especially where longer concrete slabs are required like in a bridge or a length of a beam. For this, the concrete slab is tensioned with a process called pre-stressing and the slab of concrete which comes out after this process is known as post tension slab. This slab is much stronger as well as more durable than the normal concrete slabs. In today&#;s world, where the modern engineering is finding new ways to build longer, more efficient and stronger structures, post tension slab becomes one of their chief requirements. There are many advantages and disadvantages of post tensioned slabs which we will discuss in this post.Post tension slabs are advantageous in many ways. Some of the major benefits of post tension slabs are as follows.Post tension slabs are excellent ways to construct stronger structures at an affordable price. There are many structures like parking garages as well as stadiums, since they are required to hold much more weight than average buildings, this slab becomes a viable option.The designs made with this slab are sleek, require lesser space and give way to dynamic contours. All this makes them ideal for the expression of creativity in the building design.Since the post tension slab is thin, the materials used with it are also lesser. Be it the thin beams, walls or supporting pillars of buildings, this compact concrete slab does not need bulky materials.Being a very strong substitute of the normal concrete, it lasts longer.Here are a few disadvantages of post tension slabs:1. Since there are a number of tendons and wires spread inside the post tension slab, it can result in corrosion. But largely, this tendency to corrode depends on the quality of the material used.The post tension slab can be made only by skillful professionals. The local workers may not have the necessary skills required to prepare this complex slab.The main problem with using post tension slab is that if care is not taken while making it, it can lead to future mishaps. Many a times, ignorant workers do not fill the gaps of the tendons and wiring completely. These gaps cause corrosion of the wires which may break untimely, leading to some untoward events.is one of the building blocks of theand builders cannot think of making skyscrapers, longer bridges and marvelous structures without using it. A skilled and experienced work is one of the key requirements while making these slabs, on the other hand, carelessness in the manufacture process may lead to disastrous results.
Concrete has high strength in compression but is weak in tension. Since it is brittle in nature it may crack suddenly after failure.
So, to make the concrete strong in tension and prevent the sudden collapse of the structure we have to provide tension-bearing materials like steel rods in the tension zone of the slab.
Read Also, Detailed Estimate of the building. This method is generally used for multistoried buildings. It is more accurate than the other two methods viz., plinth area method and unit base method. The cost of a structure is calculated approximately as the total cubical contents (Volume of buildings) multiplied by Local Cubic Rate.
Now let us come to our topic.
But nowadays slabs are provided tension with the help of tendons to reduce the amount of tension providing materials like steel rods.
Tendons are the group of steel wire. You can see in the picture below.
The slab which is subjected to tension with the help of tendons before casting of concrete for slab or after casting of concrete for the slab is known as pre-tensioned and post-tensioned slab respectively.
These types of slabs are used for many years for economic as well as time-saving purposes. Here we will discuss only the post-tensioned slab in detail.
Tension in the post-tensioned slab is provided in two steps after casting of concrete for the slab. Generally, it is provided in 7 days and then in 28 days, but I recommend you to provide tension as per design.
After providing tension in the tendons we have to grout with the help of cement, water, and some chemicals (Intraplaster) for strong bonding with the help of a pressure grouter. After that, the tendons wire is cut and tighten with anchors.
It has less deflection after loading.
It has high fatigue strength
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Less numbers of steel are used which decrease the chance of corrosion.
It is time saving in nature
Generally it is prepared at site so no need to transport from one place to another.
It can be casted for large span because we have to provide tension at site.
Different tendons should be used for different members like slab, beam etc.
It is les reliable and less durable than pre-tension slab
It is costlier as compared to pre tension slab
Skilled human power is required.
Difficult to grout.
Sometimes due to natural calamities and overload slab got crack in some areas. It makes the steel rods inside the slab in contact with an atmosphere that corrode the steel and make the slab week.
So for the following purpose post tension slab are used,
To avoid crack as it is post-tensioned.
To increase the strength of the slab with the help of tendons wire.
To reduce deflection in the slab, due to loading.
It is used School auditoriums, cinema hall, shopping mall, bridge, parking garage etc.
It is also used in railway sleeper, water tank etc.
First of all, we need high-strength concrete to prepare a post-tension slab. Because when tension is given in the slab then the slab has to shink somewhat to be strong in tension. If high-strength concrete is not constructed then there will be shrinkage cracks in the slab which may damage the entire slab.
When tendons are given tension force and released then the lower portion of the slab becomes more strong in tension due to compression force already added by tendons to overcome tension force.Tendons Stretcher
Now, whenever a load is applied on the slab then the lower portion of the slab balances the compression force by tendons first, and then tension forces are applied. In this way, tension resistance in the tension zone of the slab increases, and post-tension slabs are workable for more loads with low tension-steel rods.
It is for bay size 30&#;x30&#; (30 feet x 30 feet)
ParametersPost tension SlabRCC SlabSlab Thickness8 inch10 inchRebars per square feet0.8 Kg.2 KgPost-tension-steel per square feet0.5 Kg0 KgCost per Square feet. ($)8.19.16
At first, the tendons are laid down along with the other reinforcement according to the suggestion of structural engineers.
The tendons are fitted with the help of experienced labors or skilled person.
After that, the tendons should be wrapped with the help of a duct to prevent them from contact with moisture or water coming from the concrete.
One end of the tendons is fixed with the help of an anchor and another end of the tendons of the slab should be left free for proving the tension in the tendons.
Now the concrete should be cast to prepare the slab and let it take its strength till 20 to 24 days. The slab should have taken about 75% of the strength before providing tension in the tendons.
Now the tendons are provided tension force with the help of tendon stretcher.
The tension force is provided about 80% of the strength of the slab when tension is provided into tendons it gets elongated and the concrete slab get compressed to bear extra load against tension.
After the whole process, the tendons are fixed permanently with the help of an anchor and an extra part of tendons are trimmed and insulated with the help of chemical coating to prevent them from corrosion.
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