Post tensioning is a method for strengthening concrete. Post-tensioning tendons is pre-stressing steel cable televisions inside plastic ducts or sleeves, are placed in the forms prior to the concrete is placed.” Post tension cables in impact permit us to securely build large concrete structures. They permit larger spans, thinner slabs and greater ranges between assistance commons. Post tensioning is used in bridges and box girder structures worldwide including on our bridges, on and off ramps. These tendons make it possible to build structures that may not otherwise be possible. Since concrete is not flexible it can split under loads. Although rebar is used to enhance the concrete to prevent cracks from growing the concrete can still sag under increased loads. PT or post tension tendons are load bearing and can stand big boosts in loads bearing up the concrete.
There are numerous advantages that are gained by utilizing a post-tensioned approach. It allows for versatility of style, faster building and lower material expenses. Over the long term, it can decrease maintenance costs and permit increased loads over time.
Bridges that make use of post tension tendons have the ability to include long and clear periods, have few beams and slim members and thinner slabs can be utilized which is not possible in case of regular bridges. This technique strengthens or reinforces the concrete or other product with high strength steel bar or hair which is referred to as “tendons”. It significantly lowers the building weight and foundation load which is really useful in seismic locations.
Post stress tendons help in construction of intricate bridges which has particular geometry requirements such as intricate curves and super elevation. Exceptionally long span bridges can be built with the help of post stress tendons. Such architectures functions efficiently without interfering with the traffic moving under it and also lowers the influence on environment substantially.
Post tension tendons are made of prestressing strand, anchorage, ducts, and grout and corrosion protection materials. Because this innovation is brand-new for that reason there are no evaluation systems for tendon components. Recent cases of corrosion of post tension tendons in complicated bridges have actually become a substantial issue.
After getting information about tendon corrosion, department of transport has checked their post stress structure inventory to examine and quantify the rate of tendon deterioration and to approximate the staying life-span of the affected member.
Infrastructure Conservation Corporation (IPC) has developed a detailed post stress tendon assessment service called “TendonScan ®” which makes use of non destructive testing and examination approaches that can find deterioration and section loss within a PT tendon.
What it is?
As we have pointed out above that it is a thorough tendon scanning system which deals with non destructive screening principals to find out voids, water invasion and bleeding grout in external tendons. This system also consists of a gadget to discover section loss within the tendon.
Why was it developed?
During building of intricate bridges, tendons are completed grout to prevent deterioration. During grouting procedure, the grout tends to separate depending on grout’s quality, admixtures, pumping equipment and treatments. This separation result into low pH grout at tendon points and anchorage that made these locations vulnerable to rust.
Complicated bridge examination is incomplete without tendon testing for that reason we have established this TendonScan system to resolve this problem.
How it is utilized?
It is a battery ran robotic system that utilizes the latest in non damaging screening and modern technology. This system couples itself with the tendon and travel along it to carry out a MRI like examination of the material inside it. The inspector bases on the mobile control system which takes a trip along with the sensing unit. The sensing unit overcomes cordless connectivity to transfer the gathered information. The details is moved to manage station for real time evaluation of the tendon condition. The image of internal area of tendon is then highlighted in 3D color graphics so that any discontinuity like water intrusion, void or bleeding grout can be determined and quantified quickly.
What issue does it fix?
This tendon evaluation system helps in locating rust, voids, bleeding grout, area loss and other issues inside and outside the tendon. It also assists in keeping track of the discontinuities over a period of time which helps in deciding that when to repair or replace a post stress tendon.
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