A precast manufacturer is also more likely to receive greater discounts on materials due to the volume of purchases that can be made for multiple projects at a time. @CIVIL Enlightener Materials, Advantages and Disadvantages of prestressed concrete MOD 6-LEC 03||DCS 2 ||S6CE||KTU Closer quality control required in manufacture.Click to see full answer. It is relatively easy for prospective home buyers to spot issues of structural weakness or mould and damp during a viewing, however, issues regarding non-standard construction are often difficult to note. Fewer supporting columns or walls result in larger floor space, which allow more flexibility in interior design. Our team has collected thousands of questions that people keep asking in forums, blogs and in Google questions. In addition, you also need to stabilize the components to avoid damaging the actual concrete pieces. This rectifies several deficiencies of concrete. This compression is produced by the tensioning of high-strength "tendons" located within or adjacent to the concrete and is done to improve the performance of the concrete in service. We Provide Valuable Information on Construction, Building Tips, Site Knowledge & So On.. These offer great technical advantages in comparison with other . Precast concrete may be either normal or lightweight concrete. Topics: Business, Contracting eSUB, Precast Concrete. Many precast components have thinner cross sections than cast in situ concrete. What are the advantages of precast concrete construction quizlet? This result in components with smooth surfaces which resist moisture penetration, fungus and corrosion. Assembly on site is faster and less affected by adverse weather conditions. These buildings are normally associated with prefabricated mass construction method, low quality buildings, leakages, abandoned projects, unpleasant architectural appearances and other drawbacks. Other disadvantages include the following: 1. Precast piles can be cast well before the initiation of the work bringing about fast execution work. The concrete can be prone to defects, leading to structural issues later on. Composite construction using this concrete unit and cast-in-unit achieves economic structure. Having lesser beams and columns, will provide larger open space. It is strong in compression and very weak in tension. In prestressed members, compressive stresses are introduced into the concrete to reduce tensile stresses resulting from applied loads including the self weight of the member (dead load). Precast floors can also be classified according to their manufacture into totally & partially precast floors. Higher grades of concrete and steel needed to get good strength. If the labour supply experience sudden reduction while demand remains the same, labour costs will definitely be increased and produce more problems to the industry. They can be loaded very soon after driving to the required depth. It behaves non-linearly at all times. Percast concrete is mainly used in construction of high-rise buildings and flats, which are atleast 5 storeys high. Smooth surface is obtained. Perfect concrete quality in the production, laying and compaction required. iii. Prestressed concrete refers to concrete that has applied stresses induced into the member. The inherent compressive strength of concrete is used to its fullest. All of the above simplify the construction processes and increase productivity, quality and safety. What are the advantages and disadvantages of precast concrete piles? No case. High density is achieved by using vibrating table or external vibrators placed on formworks. Advantages of precast concrete piles are as follows: 1. This method is done due to bonding between concrete and steel. Frames can simultaneously achieve both structural and decorative design requirements. This characteristic of cement makes it imperative that it is used before its 'best before' date to ensure a durable structure. Disadvantages Of Prestressed Concrete: The main disadvantage of prestressing is that it requires some special equipment like jacks, anchorage etc, which pretends the use of prestressing. The ideal method is using project management software likeeSub. However, precast wall units are usually conventionally reinforced with inert steel bars. This rectifies several deficiencies of concrete. Open Building System i.e permitting hybrid applications. It is very ideal for the construction of places of worship, warehouses, halls, car parks, shops and offices. Advantages of PRESTRESSED CONCRETE: Prestressed concrete overcomes the weak property of concrete which can be difficult as in regular RCC Reinforced Cement Concrete. Excessive cost for prestressing is also there. Concrete is great at putting up with stress in the form of compression. Cracks that do form are held tightly together. Advantages Of Precast Piles: 1. Nevertheless, the government of Malaysia still feels that the usage of IBS is low despite the possible potential. Totally precast floors are composed of units, which are totally cast at the plant. When the structural elements are needed, they are immediately sent to the site and assembled continuously, forming the structural frame and enclosing the building. Source: The construction method can be classified into 4 categories: To export a reference to this article please select a referencing stye below: If you are the original writer of this essay and no longer wish to have your work published on UKEssays.com then please: Our academic writing and marking services can help you! Most people don't seem to realise that cement comes with a shelf-life. These 2 early prefabricated flats were constructed in mass to produce low cost accomodation for lower income groups. Advantages of Reinforced Concrete Reinforced concrete has a high compressive strength compared to other building materials. ii. Wastage of material is less as only the required length is cast2. This field is for validation purposes and should be left unchanged. Disadvantages of precast concrete: This plays out in multiple ways. if you have any doubts ask me in comment section. The second construction project, which used precast concrete, was the construction of 6 blocks of 17-storey flat, 3 blocks of 18-storey flat and 66 units of shop house along Jalan Rifle, Penang. This is something far more difficult to attend to than a similar situation with conventional concrete. If the full advantages of precast concrete are to be realized, the structure should be conceived according to its specific design philosophy: Long spans, appropriate stability concept, simple details,etc. Knowing the advantages and disadvantages of concrete piles is an absolute thing that must be obtained to have a foundation and careful consideration when using concrete pile products. Soluble salts cause efflorescence. Precast wall systems are mostly used in domestic construction, both for individual housing & for apartments. If it is not provided, these may break during the transport or driving. For example, this concrete is less expensive than other variants, and also saves money by being quicker to implement. Disclaimer: This is an example of a student written essay.Click here for sample essays written by our professional writers. What are the advantages of pre stressing? Concrete may contains soluble salts. After their successful visit in 1964, the government had started first project on IBS aims to speed up the delivery time and built affordable and quality houses. Both parts are working together at the final stage to achieve the composite structural capacity. The precast concrete casting can be carried on simultaneously with other works on site such as earthwork, survey, etc. Some of the drawbacks of using precast concrete construction are as follows: A large amount of resources must be invested initially to set up a precast concrete plant. 4 Piles are subjected to the driving shocks after the concrete has completely set. Application of prestressed concrete in the field of construction of industrial structures is getting momentum. Pre-tensioning is preferred when the structural element is small and easy to transport. Precast concrete is also utilized in construction of housing estates where the design of houses is uniform. Formwork is extra complicated than RC. It was reported that at least 21 of various manufacturers and suppliers of IBS are actively promoting their system in Malaysia. Precast Concrete products are monitored and quality checked before going to the jobsite. 1. It's basically like this, concrete is strong in resisting compressive forces but is very weak in resisting tensile forces ( the compressive strength of concrete is nearly 10 times its tensile strength for a particular grade). 3. Consequently, the dead load weight of the structure is decreased which results in reduced consumption of materials. Also, as elements are produced in the plant and mostly designed to be repetitive, minimal wastage will be experienced at both factory and construction sites. It requires high tensile steel which is 2.5 to 3.5times costlier than mild steel. Prestressed concrete bridges have many advantages over the reinforced concrete ones and therefore, majority of long span concrete highway bridges are now-a-days being constructed of prestressed concrete. For example, the walls of a flat built using load bearing precast walls cannot be demolished for renovation purposes, as this will affect the stability of the entire precast structure. Not only in comparison to steel, wood, & masonry structures, but also with respect to cast in-situ concrete. After the concrete has set and has reached its required strength, the elongating forces are released. It permits the use of large spans (greater than 30 m) with shallow members, even when heavy load are encountered. . After erection, the units are connected to the structure & the longitudinal joints are grouted.In some cases a cast in-situ structural topping screed is added. Used for floor and floor decks. Building can be done quickly. This is your one-stop encyclopedia that has numerous frequently asked questions answered. The name 'prestressed' itself indicates that this particular type of concrete has been put under stress . The precast frame is composed of precast column and beam. Especially when a structure is exposed to the weather, elimination of cracks prevents corrosion. This greatly reduced the number of unskilled requirements. Advantages of Prestressed Concrete. In precast concrete construction method, structural elements are produced in manufacturing plants while other activities at the construction site proceed. Precast foundation piles have many advantages: being much faster foundation time, highest foundation quality, real-time load test etc., but most importantly precast piling is a cost effective and environmental friendly method to install concrete foundation. A key advantage is that prestressed concrete elements can more economically span larger distances than conventionally-reinforced concrete elements. Precast concrete members may be solid or may contain hollow cores. Advantages of Pre-tensioned concrete: Disadvantages of Prestressed Concrete The cost of high-strength materials being used is higher than the normal RCC. Tension cracks are eliminated, reducing the risk of the steel components corroding. and thus saves time. High density concrete reduces the size and quantity of surface voids thus resisting accumulation of dirt and dust. How exactly does this work out? is cheaper than steel and prestressed concrete. This may lead to defective construction. Required fields are marked *. A huge sum of money will be saved by not having to do rectification works. Precast concrete fits nicely into this methodology. These structures, large spans, and other concrete elements require high-strength concrete that resists tensile stresses. So, feel free to use this information and benefit from expert answers to the questions you are interested in! They are expected to withstand high dynamic loads and harsh environments. 2) It requires quality control and inspection. Modern design and manufacturing method using CAD/CAM. This will help confirm that you made the right decision after switching over. Fire and weather resistance of reinforced concrete is fair. Precast components have higher density and better crack control, offering better protection from harsh weathers and sound insulation. There are many advantages of precast concrete. The main totally precast floor & roof types are described hereafter. The total registered IBS contractors in Malaysia stand for 1,993 in year 2007 and registered IBS manufacture in Malaysia until 2007 is 138 producing 347 IBS products available in the market. Precast construction also lessens the problem of site wastages and the related environmental problems. The main disadvantage is construction requires additional special equipment like jacks, anchorage, etc. Longevity of prestressed structure is greater than rcc structure because the reinforcement stays unaffected from outer agencies. Lacking in this design consideration leads to problems of leakage that becomes the common issue with precast buildings. The deformation and cracks in the PSC members are much lesser than in an RCC member. When it comes to large construction projects, space is always a concern on the different sites. Advantages of Pre-stressed Concrete Disadvantages of Pre-stressed Concrete 1) Use of pre-stressed concrete needs expertise and special equipment. 13) ADVANTAGES & DISADVANTAGES OF PRESTRESSED CONCRETE :-. Precast Concrete . Many precast concrete walls are cast in a flat position at the building site. This is of benefit in infrastructure (e.g. The precast . 2. Precast concrete is well-suited for a variety of applications, from support to foundation to full-on concrete structures. Precast products are manufactured in a casting area where critical factors including temperature, mix design and stripping time can be closely checked and controlled; and this will ensure that the quality of precast products are better than cast-in-situ concrete. Perfect quality concrete in production, placement and compaction is required. R.C.C. Disadvantages of PRESTRESSED CONCRETE: Precast wall are used for internal & external walls, lift shafts, central cores etc. In prestressed concrete, whole concrete area is effective in resisting loads, unlike RCC where concrete below the neutral axis is neglected. All work is written to order. Precast prestressed concrete used in the construction of dynamically loaded structures such as railway bridges and machine foundations and in the construction of long-span floors and roofs. PRESTRESSED CONCRETE CONSTRUCTION Advantages: The original concept of prestressed concrete was that it was crackfree under service loads. -The concrete is cured in a controlled environment as opposed to on-site or where it will eventually be. Advantages of Prestressed concrete vs. non . 2) Pre stressed concrete allows for a longer span. Deflection control. As a result, pre-making certain components is not only a time-saver but a necessity in order for some jobs to be completed. As a result, the country is faced by problems of low quality, productivity and safety in the construction industry due to high dependency of manual labour. In addition, in many cases the low cost housings are not maintained properly, thus contributing further to the poor image of IBS buildings. 3 If a pile is observed to be too long after driving it must be cut down which includes additional labor, time, and cost. After prestresssing we are able to reduce the thickness of beams and self weight. 2. Precast concrete is also resistant to fire and flooding and can be easily deconstructed. However, the design was very basic and not considering the service aspects like the need for wet toilets and bathrooms. Some latest examples are the Telekom Headquarter in KL, townhouses in Cyberjaya, City Square in Johor Bahru, Putra Mosque in Putrajaya and Metal Pak Factory in Shah Alam. Raw materials such as concrete, sand, and reinforcement bars are under high level of quality control. The prestressing system is an extra cost in the concrete casting process. Precast concrete structures have longer service years and require minimal repairs and maintenance. High Initial Investment: For installing a Precast Concrete plant, heavy and sophisticated machines are necessary which requires a high initial investment. Many companies are reliant on specialized transport methods like picker trucks. It is used mainly in the construction of buildings with repetitive design and elements, such as schools and apartments. Principle of CFRP Reinforced Concrete Structure: When a special resin is used to bond carbon fiber fabric to the tensile surface of concrete structure, carbon fiber fabric and the original structure form a new stress entirety. -The concrete is cured in a controlled environment as opposed to on-site or where it will eventually be. Charlotte Business Journal, The art and craft of commercial real estate, Lowes selling Canadian retail business for $400M, Greensboro wafer supplier plans to add 31 jobs, Wildlife Commission, private firm vie for Southport tract, Charlotte firm Tectonic plans $27M industrial building in Triad hot spot, CarolinaPower Welcomes Chip Wilson as Project Manager, Construction Industry Recruiting: Thinking Beyond the Obvious, North Carolinas Be Pro Be Proud Trucks Hit the Road, Attracting Talent That Sticks with Jim Sobeck. By producing precast concrete in a controlled environment (precast plant), the precast concrete is provides the opportunity to properly cure and be closely monitored by plant employees. One of the great benefits of the prestressed beams is the elimination of cracks from all of the load stages. Many contractors only have equipment available to actually pour it, not necessarily move around finished pieces. 2. The prestressing in post-tensioned slabs takes optimal advantage of tendon, rebar and concrete properties to deliver an economical structural system. Some of the advantages of using precast concrete construction are as follows: Precast concrete construction will save valuable time and helps to reduce the risk of project delay and possible monetary losses. It requires high tensile steel, which is 2.5 to 3.5 times costlier than mild steel. 3) It can be costly for small scale in initial cost. For structural reasons, its important that you take the time to make sure every single concrete component or building you make has the exact same properties. Elegant connections are required between columns and beams to transfer considerable forces without affecting the visual appearance of the frame. Sophisticated machineries are expensive and require heavy investment. What are the advantages of precast concrete construction?Because precast concrete is more easily controlled, the quality and durability is typically much better than cast-in-place concrete. In the construction industry today, the usage of cast in-situ method is not so practical and effective especially when it is in a large scale construction. It all depends on the final application. 14) Numerical Prestressed concrete :-. For each effect, the benefits are listed. The advantages of using precast concrete is the increased quality of the material, when formed in controlled conditions, and the reduced cost of constructing large forms used with concrete poured on site. Disadvantages of Prestressed Concrete: Material cost is very high. Advantages & Disadvantages Of Precast Piles. Prestressed concrete construction has the following disadvantages: High quality heavy duty dense concrete is required. The advantages of using prestressed concrete are: longer spans of trusses can be constructed. 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. We list out the advantages and disadvantages of prestressed concrete. Dense precast and prestressed concrete components are cast-in with smooth steel, concrete or fiberglass. Prestressed concrete is a concrete which has been tensioned before the application of the loading. Its is requires high strength concrete and they are costly. Post-tensioning is preferred when the structural element is heavy. What are the advantages of prestressed concrete? But they are still classified as precast, not sitecast. It needs highly skilled workers under skilled supervision. Proper control in casting and curing can be exercised and if any defect after casting is noticed, it can be corrected before piles are used. 16) WSM DOUBLY REINFORCEMENT NUMERICAL :-. Longer spans are achieved. DISADVANTAGES OF PRE-STRESSED CONCRETE : Any concrete contractor already has transportation available to move liquid concrete or other components to the job site in order to be poured as a baseline. The aesthetic look of the structure is enhanced. Failing to do this is limiting your profit, or worse, disguising the fact that there may be a better alternative to precast concrete for your business. Prestressing may be achieved either by pretensioning or by post-tensioning. The stress is usually imposed by tendons of individual hard-drawn wires, cables of hard-drawn wires, or bars of high strength alloy steel. What are the advantages and disadvantages of cast in place concrete? Precast concrete is a form of construction, where concrete is cast in a reusable mould or form which is then cured in a controlled environment, transported to the construction site and lifted into place. Compared to other binding materials, the tensile strength of concrete is relatively low. Precast concrete frames are cast in the same way as precast concrete cladding, but as they are designed as structural elements they have heavier reinforcement than required for non-structural cladding. They are discussed below. 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