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Prestressed concete made using high tensile wires which is stressed (as per the design load) before concreting, and post tensioned concrete made of Strands covered with duct, in this, wires/strnads are stressed after concreting then the ducts are grouted using cement slurry..
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What best compares scissors and a seesaw?
They are post examples of a fulcrum and lever
What subjects are required to study sound engineering?
That is a broad question but I would have to say some of the most important subjects would be digital audio & theory, a recording class of some sort, depending on which software you, the school or the business uses. Music theory, media arts, and of course math because, audio technology, or sound engineering, media production, music production which are all basically similar degrees are a science.
Explian about cryogenic hardening?
Cryogenic hardening is often referred to cryogenic treatment and cryogenic processing. Using the term "hardening" is not correct. Cryogenic treatment does not increase the hardness of metals (I.E. rockwell hardness). Rather it changes metals on the molecular level so that they perform better. Cryogenic treatment is used for a variety of reasons including improving dimensional stability, stress relieving, increasing wear resistance, and eliminating walk and creep. A typical cryogenic treatment lasts for several days. Metal and steel parts will be put in a cryogenic processor at room temperature. The temperature will slowly be taken down to -300F below. Then it will hold there for 12 to 24 hours depending on the company doing the treatment. After that, the processor will have the temperature raised back to room temperature very slowly. Finally, the parts will be post-tempered to finalize the cryogenic treatment. Cryogenic treatment re-aligns the micro-structure of the metal to improve its structural stability. Retained austenite will be converted to martensite which allows for a tougher piece of metal. The eta-carbides in the metal will become precipitated which allows for a much higher degree of wear resistance. Below are some good sites for additional reference...
Which of these is not an example of how engineering has affected society?
Our understanding of how cancer cells grow and spread
What is the term for a tool that makes work easier by changing the size or direction of a force?
The term for a tool that makes work easier by changing the size or direction of a force is "simple machine." Simple machines are fundamental mechanical devices that allow us to multiply or redirect the force applied to accomplish tasks more easily. There are six types of simple machines: **Lever:** A lever consists of a rigid bar (lever arm) that rotates around a fixed point called a fulcrum. Levers can change the amount of force applied or the distance over which the force is applied. **Wheel and Axle:** A wheel and axle consists of a large wheel connected to a smaller axle. When force is applied to the wheel, it can change the direction of the force and multiply it. **Pulley:** A pulley is a wheel with a groove that a rope or cable can run through. Pulleys are used to lift or move objects and can also change the direction of force. **Inclined Plane:** An inclined plane is a flat surface that is angled. It allows objects to be moved up or down with less force over a longer distance. **Wedge:** A wedge is a triangular-shaped object used to split, lift, or secure materials. It transforms a force into two forces acting in different directions. **Screw:** A screw is an inclined plane wrapped around a cylindrical post (called a screw thread). When the screw is turned, it converts rotational motion into linear motion, making it useful for lifting or holding objects. These simple machines form the basis of more complex machinery and tools we use every day. They enable us to perform a wide range of tasks with less effort by altering the magnitude or direction of forces.
What is difference between pre tension and post tension precast girders of bridge?
A simple explanation: PRE tensioned- cables are tensioned, and the concrete is cast around it. The tensioning is done BEFORE casting the concrete (PRE = before). POST tensioned- cables are placed inside of ducts or are greased to prevent bonding to the concrete, the concrete is cast around the cables, and then the cables are tensioned after the concrete has reached a desired strength. The tensioning is done AFTER the concrete is cast (POST = after).
What is the definition of post tensioned concrete?
Post tensioning is the prestressing of a concrete member by tensioning the reinforcing tendons after the concrete has set
Which grade of concrete is used in pre-tensioned prestressed concrete structure?
42 mpa for pre tension and 35 mpa for post tensioned
Difference between pre-tensioned and post-tensioned?
what a wicked page, really helpfull Difference between pre-tensioned and post-tensioned?
What has the author Eric Humphrey Cooley written?
Eric Humphrey Cooley has written: 'Friction in post-tensioned prestressing systems' -- subject(s): Prestressed concrete
What are the advantages and disadvantages between post tensioned slab and pre tensioned slab?
post tension: the forces considered as outer force since pre tension forces are internal forces.
What has the author Jun Yamazaki written?
Jun Yamazaki has written: 'Shear and moment transfer between reinforced concrete flat plates and columns' -- subject(s): Concrete Columns, Reinforced concrete, Testing 'A comparison of the behavior of post-tensioned prestressed concrete beams with and without bond' -- subject(s): Prestressed concrete beams, Testing
In what type of concrete are the tendons also known as the reinfocement cables covered to prevent bonding with the concrete and why?
The tendons aren't concrete, they're steel ropes. They're strung thru tubes rather then being cast into the concrete so they can flex. A cable twists a bit as it flexes, so if it was bonded to the concrete it couldn't flex properly. It would also be subject to corrosion from the chemicals in the concrete. The answer is post-stressed concrete.
Why is pre-stressed concrete the most ideal material to build beam bridges with?
Here is what I do know. Concrete is very good material to use when the stresses involved are in compression. It is when concrete is in tension is where it causes problems. In any beam with a load applied to it, the top portion is in compression and the bottom portion is in tension with the maximum shear stress in the center of the beam. This is ok for steel beams but concrete has a big problem with the bottom portion under tensile stress (tension). To solve this problem, someone thought why not put "rubberbands", post tensioned steel cables, in the concrete to put the bottom portion in compression? Well they did and it works well. Some advantages is that sections and beams can be precast at the concrete factory and assembled at the bridge site. Steel welders are expensive. Concrete is cheap and only gets stronger with age. It is kind of a dumb question since concrete is not an ideal material in some situations but I know what you ment. I am an engineeer, not an English major. sorry for all mispellings and incorrect grammer
How do you patch or seal an exposed rebar post tension cable in foundation slab?
Rebar and Post Tension cable (PT) are two entirely different items. Rebar is the static steel bars placed in the concrete while the PT are high tensile strength cables that were placed in concrete than stressed under hydraulic jacking to a tension generally around 2500 to 3500 psi. As a result, the situations for repair are different. The exposed rebar can be cleaned and patched through approved methods. However the PT should be looked at by a professional as it is an integral part of the structure and, as mentioned before, is under tensioned stress. If the exposed rebar is in a PT slab, caution should be used and a professional consulted as well, due the rebar being integrated with the PT.
What has the author Chester Leroy Post written?
Chester Leroy Post has written: 'Building superintendence for reinforced concrete structures' -- subject(s): Building, Concrete construction, Reinforced concrete, Superintendence
What is post mortem stress?
Post mortem stress is when a person stressed and overwhelmed by the death of someone, usually that of a loved one.
