Post Tension Anchorage – Stop By Us ASAP To Look For Extra Answers..
Post tensioning is a way of strengthening concrete. Post-tensioning tendons is Barrel And Wedges inside plastic ducts or sleeves, are positioned in the forms prior to the concrete is placed.” Post tension cables essentially permit us to safely build large concrete constructions. They enable larger spans, thinner slabs and greater distances between support commons. Post tensioning can be used in bridges and box girder structures around the world including on our bridges, on / off ramps. These tendons make it possible to construct structures that might not otherwise be attainable. Because concrete is not flexible it may crack under loads. Although rebar can be used to reinforce the concrete to prevent cracks from growing the concrete can certainly still sag under increased loads. PT or post tension tendons are load bearing and may stand large increases in loads bearing up the concrete.
There are numerous benefits which can be gained simply by using a post-tensioned approach. It provides for flexibility of design, faster construction and minimize material costs. Over time, it may reduce maintenance costs and allow for increased loads as time passes.
Bridges that utilize post tension tendons are able to contain long and clear spans, have few beams and slender members and thinner slabs can be used which is difficult in case of regular bridges. This method reinforces or strengthens the concrete or any other material with high strength steel bar or strand which is known as “tendons”. It significantly decreases the building weight and foundation load which is very useful in seismic areas.
Post tension tendons assist in construction of dead-end anchorage that has specific geometry requirements including complex curves and super elevation. Extremely long span bridges could be constructed with the help of post tension tendons. Such architectures functions effectively without disrupting the traffic moving under it and in addition decreases the effect on environment significantly.
Post tension tendons are created from prestressing strand, anchorage, ducts, and grout and corrosion protection materials. Since this technology is new therefore you will find no inspection systems for tendon components. Recent cases of corrosion of post tension tendons in complex bridges have grown to be a significant problem.
Once you have details about tendon corrosion, department of transportation has inspected their post tension structure inventory to evaluate and quantify the pace of tendon corrosion and to estimate the other lifespan of the affected member.
Infrastructure Preservation Corporation (IPC) has evolved a comprehensive post tension tendon inspection service named “TendonScan®” which utilizes non destructive testing and evaluation methods that will find corrosion and section loss in a PT tendon.
What exactly it is? Since we have mentioned above that it is a thorough tendon scanning system which works on non destructive testing principals to find out voids, water intrusion and bleeding grout in external tendons. This technique includes a device to detect section loss within the tendon.
Why was it developed? During construction of complex bridges, tendons are completed grout to prevent corrosion. But during grouting process, the grout is likely to separate according to grout’s quality, admixtures, pumping equipment and operations. This separation result into low pH grout at tendon points and anchorage which made these locations vunerable to corrosion. Complex bridge inspection is incomplete without tendon testing therefore we have developed this TendonScan system to resolve this issue.
How it can be used? It really is a battery operated robotic system which uses the newest in non destructive testing and modern technology. This system couples itself using the tendon and travel along it to perform a MRI like inspection of smtzmh material within it. The inspector stands on the mobile control unit which travels together with the sensor. The sensor works through wireless connectivity to send out the collected data. The information is moved to control station for real-time assessment from the tendon condition. The photo of internal section of tendon will be illustrated in 3D color graphics so that any discontinuity like water intrusion, void or bleeding grout may be identified and quantified easily.
What problem can it solve? This post stressed anchor helps with locating corrosion, voids, bleeding grout, section loss as well as other problems in and out of the tendon. Moreover, it also helps in monitoring the discontinuities during a period of time which will help in deciding that when to fix or replace a post tension tendon.