Disadvantages of Prestressed Concrete. For such critical structural element, the repair should only be completed using a certified, experienced repair contractor. 2) Pre stressed concrete allows for a longer span. Some people prefer a light sleep, while others prefer a deep sleep. This allows the concrete to be treated in a more durable way, which can result in a longer lasting concrete project. An inward slope of 1in 20 on either side is provided to achieve required tilt of rails, at the time of pressing the sleepers. -Pre-treated concrete is less likely to be as responsive to changes in temperature or weather. The cookie is used to store the user consent for the cookies in the category "Other. Longer span length increases untroubled floor space and parking facilities. Post-tensioning is preferred when the structural element is heavy. Cement cant be used for large-scale construction works since it has higher heat hydration than concrete. Steel has very small resistance against fire as compared to concrete. Ample space required to do the precast works. Plate sleepers consists of two rectangular plates. Pre-stressed concrete is less likely to cause environmental damage than traditional concrete. These sleepers are used at rail joints to prevent Cantilever action between two supports of CST-9 Sleepers. Your email address will not be published. It is now commonly used for floor beams, piles and railways sleepers, as well as structures such as bridges, water tanks, roofs and runways It's a site that collects all the most frequently asked questions and answers, so you don't have to spend hours on searching anywhere else. These sleepers are constructed with steel elements, which are generally manufactured using steel troughs made of 6 mm thick steel sheets. Advantages of prestressed concrete: . Pre-stressed concrete is a type of concrete that is pre-treated to resist cracking and warping. The followings are the disadvantages of prestressed concrete: It requires high-strength concrete and high-tensile-strength steel wires. What is Concrete? Possibility of steel corrosion and subsequent concrete deterioration is declined because concrete is crack-free. The railway sleepers should ideally be laid on a surface that is level and firm. Advertisement cookies are used to provide visitors with relevant ads and marketing campaigns. Possibility of steel corrosion and subsequent concrete deterioration is declined because concrete is crack-free. The Metal Sleepers Advantages and Disadvantages are discussed in this post. What are the advantages of prestressed concrete? 4 What are the advantages of prestressed concrete as compared to normal concrete? Get Ready for Power Bowls, Ancient Grains and More. Since the early 1950s, post tension tendons have been used in the design of concrete structures. If your partner is a type of sleeper that has the maximum creep, then you may want to consider moving. We use cookies on our website to give you the most relevant experience by remembering your preferences and repeat visits. It is economical as compare to wood and steel. This cookie is set by GDPR Cookie Consent plugin. It is also difficult to cure, thus making it unsuitable for areas that are susceptible to movement. Provides adequate warnings if designed correctly before collapsing. These cookies help provide information on metrics the number of visitors, bounce rate, traffic source, etc. It requires high strength concrete and high tensile strength steel wires. This means that it is easier to stay safe when working with a building or structure, and it is less likely to catch on fire. Importance of Geology in Civil engineering. Highly skilled manpower and supervision required. Sleepers hold the rails in proper gauge by fixing them in position. An insulator plate is placed between rail and tie to isolate the tie electrically. It is more durable having greater life (up to 50years) . The load-carrying capacity is comparatively higher. A persons sleep type can be determined by theirallowance for sleep, their age, their sex, and their health condition. High strength steel is required, which is 2.5 to 3.5 times more expensive than mild steel. In this type of sleepers, A box is provided at the top of each plate, having similarities with plate sleepers. Prestressed concrete has the following advantages: Since the prestressing technique removes cracks from the concrete at all stages of loading, the entire section of the structures takes part in the resistance to external load. . How do I choose between my boyfriend and my best friend? 2) Pre stressed concrete allows for a longer span. What are prestressed concrete two advantages of prestressing? What is the concrete mix ratio for concrete What is disadvantages of concrete sleepers? Which Teeth Are Normally Considered Anodontia? Concrete Ties: Concrete ties are rapidly gaining acceptance for heavy haul mainline use as well as for curvature greater than 2 degree. Cast iron sleepers have been extensively used in India as compared to the other countries. Track circuiting can be executed by using these types of sleepers. The metal of sleepers should be strong enough to resist bending, It is more durable. They all have their own advantages and disadvantages, which may be useful for track laying work in different geographical locations, and depending upon the length of the gauge used for that track in the railway project. Advantages of Prestressed Concrete: Prestressed concrete members are free from cracks and the resistance to the effect of impact, shock and stresses are higher than RCC structures. Advantages of Steel Sleepers It is more durable. These sleepers are heavily damaged in case of derailment or accident of trains. There are also several disadvantages to using pre-stressed concrete, including: -Pre-treated concrete is more expensive than regular concrete. These sleepers are in use these days. -Pre-treated concrete is more resistant to water infiltration, leading to a longer lasting finish. should be easy to handle. Their design takes into account static and dynamic loading conditions. Followings are the disadvantages of prestressed concrete: It requires high strength concrete and high tensile . Longer span length increases untroubled floor space and parking facilities. These cookies ensure basic functionalities and security features of the website, anonymously. They can be left in their natural state or they can be modified to suit the rest of the yard design. : R.C.C. Due to the increasing shortage of timber in the country and other economic factors have led to the use of steel and concrete sleepers on railways. 2) Pre stressed concrete allows for a longer span. The main disadvantage is construction requires additional special equipment like jacks, anchorage, etc. Prestressed concrete construction has many advantages over traditional concrete construction. Its life is about 35 years Lesser damage during handling and transport It is not susceptible to vermin attack It is not susceptible to fire Its scrap value is very good Disadvantages of Steel Sleepers It is liable to corrosion. It does not store any personal data. 3) Pre-stressed concrete members offer more resistance against shear force. They absorb shocks and vibrations better than other types of sleepers. Post-tensioning is preferred when the structural element is heavy. Hence they are universally used. Finally, concrete sleeper beds are not very aesthetically pleasing, as they are typically simple, box-like structures. Why Do Cross Country Runners Have Skinny Legs? This type of sleeper is also used in skyscrapers and other high-rise buildings. Pre-tensioning is preferred when the structural element is small and easy to transport. Form good track for light traffic up to 110 kmph as they form rigid track subjected to vibrations under moving loads without any damping, Gauge maintenance is difficult as tie bars get bent up, Heavy traffic and high speeds (>110kmph) will cause loosening of keys and development of high creep, It is more durable having greater life (up to 50years). Following are the types of railway sleepers: These are commonly 254mm wide by 127mm thick in cross section by 2600 mm long. What are the disadvantages of post-tensioning? the lowest carbon footprint for a structure or pavement over its lifecycle. Also, the inward slope of the rail seat provided is 1in 20. The prestressing system works for a span greater than 35 m. Prestressing will increase the shear strength and exhaustion resistance of concrete. What are the advantages of post-tensioning? They are not suitable for all types of ballast. If you construct them professionally and look after them, they will last a good 15-20 years (even more). . Softwood Ties: softwood timber is more rot (decay) resistant than hardwood, but does not offered resistance to spike hole enlargement, gauge spreading, also are not as effective in transmitting the load to the ballast section as the hardwood tie. 9 What kind of steel is needed for prestressed concrete? What are the advantages and disadvantages of pre tensioning? They are very strong in resisting tension and do not creep under stress. It is brittle and cracks without warning. Compared with wooden sleeper, concrete sleeper with extra weight makes track more stable. The gauges can be easily maintained and adjusted, Their scrap value more than the wooden sleepers. Analytical cookies are used to understand how visitors interact with the website. Earthquake Resistant Construction Techniques, Self Healing Concrete- Types, Advantages, Disadvantages, Dewatering Techniques for Construction Projects, Top 10 Construction Industry innovations in 2021, Manual handling; no damage to sleeper while handling, Manual handling; liable to break by rough handling, No manual handling; gets damaged by rough, No damage by white ants but corrosion is possible, The initial and maintenance cost of railway sleepers should be low, Moderate weight i.e. High tension steel wires are used. It is more efficient, economical, and environmentally friendly. -Pre-treated concrete is also less likely to require painting or caulking after it is installed. This will reduce the likelihood of any cable becoming loose and causing a failure. Advantages of Prestressed Concrete Sleepers: Disadvantages of Prestressed Concrete Sleepers: Comparison of different types of Sleepers. What are the advantages of prestressed concrete over reinforced concrete? They are very cheap in the long run due to their long life. Do Men Still Wear Button Holes At Weddings? The physical FE model of the concrete sleeper and ballast layer are created using the elements mentioned above, as shown in Fig. They are very strong in resisting tension and do not creep under stress. It cannot be repaired, and required replacement. We also use third-party cookies that help us analyze and understand how you use this website. The main disadvantage is construction requires additional special equipment like jacks, anchorage, etc. Prestressed members are lighter in weight and easily transportable. Precast members like electric poles and railway sleepers are produced in factories using simple pre-stressing methods. For one, concrete is strong and durable, which can save on construction costs. Disadvantages of Prestressed concrete It is economical for large-span structures only. For example, they can be rendered smooth or textured and painted a variety of colours. There are a few disadvantages to using concrete sleepers. The concrete is not as likely to crack or break under heavy use, which makes it more resistant to deterioration. Required fields are marked *. There are generally two types of RCC sleepers. These sleepers are best suitable for track circuiting. Reinforced concrete members require additional shear reinforcements to resist shear forces. It is difficult to maintain gauge in case of wooden sleepers. The gauge can be easily maintained and adjusted using these sleepers. 1 What are the advantages and disadvantage of prestressed concrete? What are the advantages of prestressed concrete construction? Press ESC to cancel. Pre-stressed concrete is typically less expensive to build and is typically less expensive to maintain. Initial costs are greater, and they are unsuitable for change of gauge, unless this is already taken into account. Overall, prestressing is an efficient structural form, which minimises the volume of concrete required and permits new types of structures (not affordable with ordinary reinforced concrete). This website uses cookies to improve your experience while you navigate through the website. This type is preferably used in bridge approaches, heavily traveled, railway crossovers and as transition ties. Advantages of Prestressed Concrete Sleepers: Disadvantages of R.C.C. What is the purpose of a post tension slab? This type of steel ties can cause problem to signals control system. What Are The Advantages And Disadvantages Of Concrete Sleepers? What are the disadvantages of concrete construction? The reason is because post-tensioning is a method of pre-compression, which means the concrete is put into a state of compression, which allows the concrete to take on flexure without cracking. Dense concrete is provided by a prestressing system, thereby . Section remains uncracked under service loads. It allows slabs and other structural members to be thinner. Cracks at rail seats develop during the service. Wooden sleepers are suitable for all types of ballast. What is the reason for using prestressed concrete? Longer spans results in fewer joints, as a result, less maintenance is needed. Pre-stressed concrete offers more advantages than reinforced concrete, which are as follows; 1) The cross-section is utilized more efficiently in pre-stressed concrete as compared to reinforced concrete. The first disadvantage is that concrete is a heavy material that can take a lot of wear and tear. What is the formula for calculating solute potential? 2. Compared with wooden sleeper, concrete sleeper with extra weight makes track more stable. Prestressing also reduces the diagonal tension in concrete. Advantages of Concrete Sleepers. The cookie is set by the GDPR Cookie Consent plugin and is used to store whether or not user has consented to the use of cookies. . The cookie is used to store the user consent for the cookies in the category "Performance". 10 What are the disadvantages of concrete construction? In this method prestressing is done after the concrete attains sufficient strength. Because it has essentially zero strength in tension, it is almost always used as reinforced concrete, a composite material. Switch Ties: The primary use for switch ties is to transfer load (as from the name) and are made of hard wood. 10) Prestressed concrete can be used with an advantage in all those structures where tension develops, such as railway sleepers, electric poles, u/s side of gravity dams. They are an inexpensive option and are highly durable. There are a few benefits to using concrete sleepers. It requires a smaller amount of construction materials. The initial cost of these sleepers is more than wooden sleepers. They are liable to crack due to creep and shrinkage. One of the great benefits of the prestressed beams is the elimination of cracks from all of the load stages. The cookie is set by GDPR cookie consent to record the user consent for the cookies in the category "Functional". These Sleepers have a high initial cost, but the cost of maintenance and operation is very low. Solve this simple math problem and enter the result. It requires highly skilled workers under skilled supervision. The shear resistance of members can be increased by using curved tendons. Railway Sleepers are the transverse members that are laid to support the rails. What are the advantages and disadvantages of cement? 4) Considering same depth of concrete member, a pre stressed . Pot sleepers consists of two bowls placed under each rail and connected with a tie bar. The prestressing of concrete has several advantages as compared to traditional reinforced concrete without prestressing. What are the advantages of concrete sleepers? Concrete sleepers may be of two types: Stay informed - subscribe to our newsletter. Necessary cookies are absolutely essential for the website to function properly. Which is correct poinsettia or poinsettia? Additionally, concrete is an environmentally friendly material, which can help to conserve resources. What Is The Wavelength Of Visible Light In Meters, Do The Halogens Family Have 7 Valence Electrons. This cookie is set by GDPR Cookie Consent plugin. Which is the most durable type of concrete? -Pre-treated concrete is also more resistant to staining and other environmental damage. Concrete is a non-linear, non-elastic and brittle material. By using a higher level of compression, prestressed concrete sleepers are said to help reduce the amount of noise that is made during sleep. The scrap value for this type of sleepers are Nil. This cookie is set by GDPR Cookie Consent plugin. They can easily be moulded into the required/design shape to withstand stresses induced by fast and heavy traffic. Performance cookies are used to understand and analyze the key performance indexes of the website which helps in delivering a better user experience for the visitors. Prestressed concrete construction has the following disadvantages: High quality heavy duty dense concrete is required. Another advantage of using pre-stressed concrete is that it is a less expensive option than traditional concrete. For one, concrete is strong and durable, which can save on construction costs. Why is post tensioning better than pre tensioning? How do you stop sleepers from rotting in the ground? These cookies will be stored in your browser only with your consent. . Advantages and disadvantages of Prestressed concrete. Softwood ties are typically used in open deck bridges. 2 What are the advantages of prestressed concrete? It allows us to build slabs on expansive or soft soils. The main prestressed concrete advantages are as follows: The overall lifespan of prestressed structures is more imperative than the RCC structures considering the way that the reinforcement stays unaffected or undisturbed from external agencies. Advantages & Applications of Post-Tensioning. Additionally, concrete is a great choice for bedrooms that dont have a lot of airflow. There are also disadvantages to using concrete sleepers, though. The utility of timber sleepers has not diminished due to the passage of time. Sleepers are beds in the railway tracks. needs lot of form-work, centering and shuttering to be fixed, thus require lot of site space and skilled labour. They are widely used in high speed railway and the stability is much higher than wood sleepers. Some problem of fatigue cracking have also experienced. They are free from the attack of insects, decay etc. Large rigidity, smoother bottom rail deflection, less dynamic gradient. Pre-stressed concrete members offer improved resistance against shear forces due to the compressive prestressing force. The performance, endurance and quality of prestressed concrete sleepers can detrimentally affect the serviceability and durability of a railway track. For one, concrete is much more durable than traditional bedding materials. The disadvantage of pre tensioning is that it can add unnecessary weight to a construction project. It has made significant contributions to the construction industry, the precast manufacturing industry, and the cement industry. What kind of steel is needed for prestressed concrete? Wooden sleepers absorb shocks and vibration, and this ensures a more convenient journey to the passengers than any other Sleepers. They are less durable as compared to other types of Sleepers, Maintainance cost is best suited for track circuiting. The life of steel sleepers is more than wooden sleepers. These types of Sleepers are subjected to wear, tear and decay. You also have the option to opt-out of these cookies. The greatest stretching force which is applied in the range of 250 kN to 500 kN and this may not sufficient in many cases. It needs highly skilled workers under skilled supervision. C.I. What are the disadvantages of wooden sleeper? advantages and disadvantages of prestressed concrete, advantages and disadvantages of prestressed concrete, advantages and disadvantages when partial prestressing is done, advantages and disadvantages of prestressed concrete, prestressed concrete advantages and disadvantages, what are the 4. Longer spans results in fewer joints, as a result, less maintenance is needed. Further advantages of prestressed concrete include control of cracking and construction speed. 3 What are prestressed concrete two advantages of prestressing? Functional cookies help to perform certain functionalities like sharing the content of the website on social media platforms, collect feedbacks, and other third-party features. The use of the prestressed technique in concrete gives it greater strength, by providing an internal compression force which counteracts the traction force produced by the loads of the structural elements. This is because concrete doesnt create any noise when you move around in it, which is important for a quiet bedroom. Additionally, concrete is an environmentally friendly material, which can help to conserve resources. where wooden sleepers are used. It doesnt cause any air pollution, and its very easy to clean. There are many disadvantages to using concrete sleeper beds, but perhaps the most notable is that they are not very comfortable. Concrete sleepers have a long service life, generally 40 to 60 years. Pre-stressed concrete is an excellent choice for projects that require a high degree of quality and durability. 6. However, you may visit "Cookie Settings" to provide a controlled consent. They are very cheap in the long run due to their long life. a building material that doesnt burn, rust or rot. Use of curved tendons especially in long span members helps to decrease the shearing force at supports. This rectifies several deficiencies of concrete. Other uncategorized cookies are those that are being analyzed and have not been classified into a category as yet. Cast iron sleepers can be widely classified into following types. Should have sufficient effective area to transfer load from rail to ballast. Creosote is an oil generally used/ sprayed on the surface. Is concrete strong in tension or compression? These are the types of sleepers which are extensively used nowadays in Indian Railways. Since there are a number of tendons and wires spread inside the post tension slab, it can result in corrosion. Advantages of prestressed concrete - Prestressed member is free from crack, so the resisting impact, shock and reversal of stresses is much more than reinforced concrete. There are a few different advantages to using pre-stressed concrete, including: -Pre-treated concrete is less likely to crack or warp in the event of a storm. In this method, products are changed according to the structure. The standard length of these types of Sleepers is 2680 mm. It is often used in building and construction projects where the members are close together. Pre tensioning is a technique used in many types of construction to increase the strength of the connection between the members of a structure. These cookies track visitors across websites and collect information to provide customized ads. DISADVANTAGES OF PRE-STRESSED CONCRETE : The main disadvantage is construction requires additional special equipment like jacks, anchorage, etc. Which of the following is a disadvantage of Freyssinet system? The high compressive strength of . It reduces or eliminates shrinkage cracking-therefore no joints, or fewer joints, are needed. . 2022 Times Mojo - All Rights Reserved High elastic cushion ensures even orbital elasticity. In India, Sal, Teak, Deodar are the most common types of timber used for the manufacture of wooden sleepers. Its life is about 35 years, Lesser damage during handling and transport, It can be used only for rails for which it is manufactured. Finally, concrete is easy to clean, which can save time and money on cleaning costs. Longevity of prestressed structure is greater than RCC structure because the reinforcement stays unaffected from outer agencies. The connection can also be more resistant to wear and tear. The sleepers are first seasoned (drying for up to 12 months so that to remove the juice/sap) and treated with preservative. The spans of prestressed beams and girders are longer compared with that of reinforced concrete. CST-9 Sleepers are most satisfactory than other C.I sleepers and had been extensively used in Indian Railways. Longer span length increases untroubled floor space and parking facilities. It requires high tensile steel which is 2.5 to 3.5times costlier than mild steel. Fixing and removing of fasteners should be easy. TimesMojo is a social question-and-answer website where you can get all the answers to your questions. 3) Pre-stressed concrete members offer more resistance against shear force. Upwote 6 Share o> Related Questions 'what's prestressed concrete and what isthe advantage of prestessed concrete over Rec 'What are the advantages of prestressed concrete? sleepers are not suitable for track circuiting, These sleepers are not suitable for all types of ballast. The scrap value is zero in these types of Sleepers. This means that it is much more resistant to structural damage, such as water infiltration. While it allows concrete and steel building materials to work together, as post-tensioned structural elements better meet equivalent loads, long structures with small cross-sectional areas make it possible to pass wide openings. One of the most important advantages of prestressed concrete construction is that it is much more sustainable. -Pre-treated concrete may be less resistant to termites or other pests. Advantages of Prestressed Concrete Sleepers: As high tensile wires used and the concrete is Prestressed, they are less liable to cracking. Softwood ties and hardwood ties should not be mixed on the main track. The added weight helps the rail to resist the forces produced due to thermal expansion and which can buckle the track. Design life is very high for reinforced concrete structures. Perfect concrete quality in the production, laying and compaction required. As high tensile wires used and the concrete is Prestressed, they are less liable to cracking. It requires highly skilled workers under skilled supervision. maximized energy efficiency via thermal mass. 1. What are the advantages of prestressed concrete as compared to normal concrete? Almost from 600-700C half of steel strength reduced. They are very cheap in the long run due to their long life. These sleepers are made of cast iron. The number of sleepers in a track can also be specified by the number of sleepers per kilometre of the track. For one, they are not as comfortable as other types of sleepers. They are very strong in resisting tension and do not creep under stress. Reinforced Concrete and prestressed concrete sleepers are now replacing other types of sleepers except in some special circumstances like bridges etc. Advantages of Prestressed Concrete. As high tensile wires used and the concrete is Prestressed, they are less liable to cracking. It provides an elastic medium between the rails and the ballast. Cement is less solid than concrete and prone to cracking. Advantages of Prestressed Concrete Longer span length increases untroubled floor space and parking facilities. It ensures the stability of the permanent way as a whole. what ae 'tendons in prestessing of concrete? They are very strong in resisting tension and do not creep under stress. Cracks that do form are held tightly together. Which is better pre tensioning and post-tensioning? Your email address will not be published. In the design of Steel sleeper, the following are considered: They are further divided into two categories: They have design life of up to 40 years. They are easily liable to attack by vermin and weather, It is difficult to maintain gauge in case of wooden sleepers. unparalleled strength, durability, longevity and resilience. Additionally, concrete sleepers can be quite expensive to replacement. Disadvantages of steel structures Maintenance cost of a steel structure is very high. 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