Post Tensioned Cables. In the case of slab-on-grade scanning, technicians are often trying to identify a location where construction workers can cut a trench for installing a water line or some other utility. A typical steel strand used for post-tensioning will yield about 243,000 psi. Slab Thickness. Concrete Scanning - Scan2Core, Inc No costly off-site data processing is needed with GPR. This means there is an inherent risk of striking rebar, electrical and communications conduits, and post tension cables during the cutting, coring or drilling process. That is not practical for residential slabs. Post Tension Cables Located - Ground Penetrating Radar ... Can safe be bolted to post-tensioned slab? - Calguns.net Areas where soils are expansive in nature or have poor load bearing capacity use post tension slabs more than other areas. The following can be found using x-ray GPR scanning technology: A residential post-tensioned concrete slab will typically be 8 inches thick and use 3000 psi concrete. Contractors can safely core without causing power outages and widespread damage.. Our concrete imaging process leverages technical expertise to analyze complex mapping systems.Field employees can detect the thickness of suspended or on-grade concrete slabs. PT foundations use high strength concrete. In contrast, a typical piece of rebar will yield about 60,000 psi. Learn More. Should we use X-Ray or GPR? Ground Penetrating Radar Systems, LLC. You will receive the best customer service, most precise readings and the best rates! Safe2core Inc specializes in Ground Penetrating Radar (GPR)/Concrete Scanning, Concrete Cutting (Slab Sawing, Wall Sawing, and Core Drilling), Underground Utility Locating/Mapping, and CCTV Pipeline Inspection. Radar Concrete Scanning is sometimes confused with Concrete X-Ray to locate post-tension cables and other objects in concrete construction prior to cutting or coring. Using fewer beams that run from one end to the other creates a clearer construction that increases strength and is also more cost-efficient. Concrete Scanning. Above is an X-Ray showing Post-Tensioned dead-end anchorages, rebar, and other Post-Tensioned cables. Fig 3: Steel tendons used in Post Tensioning of Slab. This helps when trying to differentiate if the reinforcing is rebar or post tensioning cable. It is also used to evaluate existing floor slabs, bridge decks, balconies, tunnels, and post-installed rebar connections and to check . Reinforcing steel locations are marked directly on the work surface to ensure safe and efficient drilling that will preserve the integrity of the structure and reduce the need for repairs or patching. Answer (1 of 4): Cost is related to material, time and space. At Global GPR Services we use Ground Penetrating Radar (GPR) equipment which uses radio waves that are safe and not gamma rays used in concrete x-ray equipment. Davis Laboratories offers affordable digital concrete x-ray imaging using non-destructive X-rays to find out the exact location of rebar, conduit, post-tension cables,… composite pre s t ressed deck slab. ConstruCtion Costs Eliminates or significantly reduces potential floor cutting and saves weeks in the overall construction cycle. The operator must determine which is which. Ground Penetrating Radar Used to Locate Post Tension Cables at Residential Property - Phoenix, AZ. These are often used as components of concrete slabs where extra forces are needed to achieve structural integrity without having to thicken the . Arizona Post-Tension is the most trustworthy and convenient foundation partner for the builders we serve, providing an honest ability to change the needs of all . Should we use X-Ray or GPR? Concrete Scanning is ideal to confirm the location and setout of reinforcement, post-tension and pre-tension cables, ducts, structural beams and voids, and should be used prior to commencing core drilling, concrete cutting, dyna-drilling, wall-sawing or cutting, and the . Stronger concrete slabs, minimized cracking, and faster installation are just a few of the benefits Post-Tension Services of Texas provides. The investment could save your life. Once the concrete has gained strength to 2000 psi, typically within the 3 to 10 days recommended by PTI, the tendons are stressed. at a min. The cost of using a post tension slab system is more economical when the soil conditions are poor and would require additional measures to reinforce the area below the slab to be poured. Like an X-Ray. In fact, most architectural and engineering specifications which require "x-ray" don't really mean x-ray — they're using the term in the same way people ask for a "band . Drilling a PT slab should never be done unless you've had the slab x-rayed, and since a slab x-ray costs a pretty penny, I'd never drill one. The customer did not wish to strike post tension cables in the slab, causing costly and unwanted repairs as well as safety hazards. Generally, the tendons are located after the fact in post tension slabs via portable x-ray units. Concrete slab x rays target elevated slabs or the renovation of concrete wall surfaces where both sides of the structure are accessible. We are able to detect metallic and non metallic objects and features such as rebar, post tension cables, metallic/non-metallic conduits and pipes, and voids, as well as measure slab thickness. 2,100# of shear per bolt. of Phoenix, AZ was contacted by a local residential general contractor to locate post tension cables and conduit in a concrete slab for a residential renovation in Phoenix, AZ. Conduits. Unlike X-Ray equipment which requires job site. While they were initially used in areas where soil movement was a concern, post-tension cables (tendons composed of steel wires embedded in concrete and then tensioned after the concrete is hardened) are being used around the country on projects ranging from . Suncoast Post-Tension is North America's largest unbonded post-tension specialist. GPR Data can provide thorough post tension cable imaging. of 4,000 psi but typically tests at close to 6,000 psi. If you really want to move the drain then have someone come in and x-ray the slab. Distress is often manifested by signs of anchor plugs popping out of the slab edge, evidence of rusting along the delay strip seams, spalled concrete also with signs of rust, and shear crack in concrete or masonry walls located toward the ends of the slabs. Both post-tensioned tendons and reinforcement bar will show up on scans. Information is provided immediately and marked on the slab. Post tension cable locators are critical for renovation projects and finding damaged cables within concrete structures. is a priority. At Penhall Technologies, a division of Penhall Company, we specialize in concrete scanning, private utility locating, digital x-ray imaging, and fiber-reinforced polymer (FRP) for structural reinforcement. Expert Ground Penetrating Radar Service for Oregon and Washington Ground penetrating radar (GPR) is a technology to look inside concrete and soil. If you have 2" PVC, chip away enough concrete to replace the drain and go from there. Originally Posted by ENG417. It is the safest and most cost effective way to locating objects in concrete structures prior to cutting, coring or drilling. We Service. Stronger concrete slabs, minimized cracking, and faster installation are just a few of the benefits Post-Tension Services of Texas provides. Impossible with X-ray. But as long the tendons and the concrete in front of the anchors are not damaged, drilling into a post-tensioned slab is a fairly routine issue. An advantage of x-ray is that x-ray can provide a clear image of the rebar or post tension cable. Step 1. epoxy, 3/8" dia. Once technicians locate rebar and post-tension cables in concrete with GPR, they mark these locations directly on the slab. With over 25 years of experience, we have a team of expertly trained employees and continually invest in specialty . WE LOCATE POST TENSION CABLES, CONDUIT, REBAR, SLAB THICKNESS, VOIDS. Ground Penetrating Radar is widely used for assesing the interior of concrete structures. OP: X-ray is considerably more expensive than GPR scanning (about 5x in my area), and whilst it does give superior images, its cost and safety issues have resulted in that most concrete imaging today utilize GPR. Many of today's high performance slabs contain Post Tension Cables. #1. Concrete X Ray X-Ray has been a popular method for imaging concrete slabs before drilling, cutting, and coring, but concrete radar with GPR is better in every way. The concrete scanner is used to locate reinforcing steel, electrical conduits, post-tensioned cables, metal and plastic conduits, glass-fiber cables, wood, and voids in concrete structures up to 12 inches deep. But all slabs are not done that way. The use of x-ray imaging also emits harmful radiation to technicians and those in the area- special precautions must be taken to ensure site safety. A 3-dimensional GPR image showing a post-tension cable, conduit, and rebar mat embedded within . GPRS, LLC. This practice used to create markings for managing locations of embedments in slab even conduits before core drilling or similar activities are performed. When used with training and skill, it can be used to find things without digging, cutting, or demolishing. If a striking occurs, repair costs begin to add up, delays creep into your schedule and it creates a safety hazard for your employees. This is near an existing panel and I believe we have identified all the electrical conduit, but there could be other pipes, post-tension cables, rebar, etc. GPRS-trained project managers are able to locate rebar and post-tension cables within the concrete using GPR technology. How much does this service cost? Plus, you can perform concrete scanning tests on your own terms—without unnecessary costs or delays. Whether the post-tension cables are banded, bundled, or with uniform layouts - we find what you need and provide you with a thorough 3D image and (x, y, z) positioning report. Our uniformed, professional GPR Technicians are trained to handle a wide variety of residential and commercial Concrete X-ray issues. Why doesn't your company use X-Ray for the home slabs? This further reduces the amount of concrete needed for building projects which also reduces the weight. Concrete x-ray scanning is used for evaluating a surface to identify areas for post tension cables and rebar reinforcments. of tension. With over 45 years of combined experience, Safe2core has been solving many complex cases encountered by our customers in all types of projects from . Observing Distress in post-tensioned slabs is often an indication that one or more of the above mentioned issues is of concern. In the case of pre-tensioned and post-tensioned concrete, the stress is maintained by a large nut on the end of the steel strands, whichi is embedded in the concrete, and forms a permanent connection. ART Location Services, Inc. provides concrete X-Ray, GPR and Utility Locating Services to contractors located in San Diego, Orange County, Los Angeles, Riverside and the Southern California region. Over 45 Years of Combined Experience. Additionally, we assist both residential and commercial . For this reason x-ray work is generally performed after hours, adding to the overall cost. I've written a great deal in the last couple of years regarding design considerations for post-tension slabs, as well as the "right" way to install and finish post-tension tendons.. And while I've touched briefly on some of the potential pitfalls of post-tensioning, I haven't discussed the potential impacts — and mitigation — of seriously damaged post-tension tendons. We capture images using an x-ray machine. Utility Survey Corp. uses GPR to locate wire mesh, rebar, post-tension cables and embedded utilities within concrete slabs. The released tension will find the path of least resistance. One major advance is the use of ground-penetrating radar (GPR). The Hilti PS 1000 X-Scan, now equipped with an . arrived on site to provide immediate, real-time, digital concrete imaging (Ground Penetrating Radar) and illustrate on site, the clear locations of all . We are dedicated to providing the construction industry with engineering expertise, responsive service and manufacturing excellence to ensure safe, timely and cost effective installations, restorations and repairs. That said, there is almost invariably 1 1/2" minimum cover over the top of the tendon and fastener manufacturers such as Hilti make 1" long expansion cases. We help contractors locate post tension cables, rebar and conduit embedded in concrete prior to coring, saw cutting or drilling. The prestressing steel is manufactured as per the requirements of ASTM A-416 and typical strand sizes are 0.50 and 0.60 inch in diameter. Further, if you should hit a tendon while using the hammer drill, you can feel it immediately. Our friendly staff and highly trained technicians will go beyond to make sure your business with us is always exceptional. The x-ray process is slower than GPR scanning, and images must be developed off-site as opposed to the . The cost of such mistakes can be high. We have found that our typical accuracy is +/- ¼" to the center of the object in concrete we locate: conduit, post tension cables, and rebar. Post tension slab or struCtural slab renovation Eliminates the costly expense of having to x-ray the slab to find specific locations that are free of cables where a hole or trench could be cored for piping or Reinforcing Steel. In this latest American Renovation episode, our licensed and insured general contractor TJ Afdasta reveals one of the potential locations in your house to de. all-thread rod with 1 3/4" embedment you get the following values: 475# of tension per bolt. Why Should You Use GPR Instead Of X-ray? Leak Detection. Determining the location and depth of these objects within concrete structures is crucial before cutting, drilling or coring. Nothing philosophical but logical 1. With the most advance technology in Ground Penetrating Radar and . When there done you get a picture to scale of the internal piping or what ever is in the slab in that area Xrayed so you can place it over deck area and drill after you mark area . Anomalies that can be recognized by 3D concrete "x-ray" technology include air voids, fiber optic cables, post-tension cable, pipes, rebar, and conduit. Before you break out your jackhammer, use a locating device to find those post-tension cables. This service is also faster and safer than conventional radiography (Concrete X-Ray) and only single-sided access is needed. If you use Simpson S.E.T. A collection of 2-D GPR scan lines from grids with . Call MD Concrete Imaging before you Cut, Core, or Drill! GPR Data. Rebar, conduits, post-tensioned (PT) cables, pipes and other features need to be located to minimize cost, worker hazards, and structural concerns. We also carry out concrete testing. Scan2Core, Inc. is a structural imaging and core drilling company using the latest and most advanced mobile, Ground Penetrating Radar (GPR) concrete scanning technology. Below is an example of some GPR data and the transcription of this data to the surface of a post-tension concrete slab. about the demolition of post-tensioned concrete but there is enough such concrete now in service to become a problem for . . ART Location Services, Inc. provides concrete X-Ray, GPR and Utility Locating Services to contractors located in Sacramento, San Francisco and Santa Clara Counties, and the Northern California region. We need to drill a small hole (1") through a 10" slab. In short, concrete scanning equipment uncovers and reveals what is inside a concrete slab by plotting 2-D and 3-D images or maps. We are a full-service Post-Tension Foundation Company based in Dallas, and we specialize in residential and commercial slab-on-ground and elevated Post-Tension Concrete new construction projects. Material: considering material and labour cost post tensioned slab is costlier 2. 888-917-4488. Exceeding our customers expectations is our main goal at Pro Scan. That is after 20 years of construction experience and years working with concrete and PT. The cables installed are usually pulled so they each have approximately 28,500 lbs. The photo below shows a typical elevated concrete slab layout after we finish scanning. Unlike radiography (x-ray) the GPR signal is harmless, a permit is not required, and an exclusion zone is not necessary. It is spec. Choose your level of control Overview of the Hilti PS 1000 and the PS 250 detection systems. The radar is much safer than x-rays and can be done in structures without disturbing the occupants. arrived on site to provide concrete imaging services in a quick and cost effective manner to keep the job safe and on schedule. We are a full-service Post-Tension Foundation Company based in Dallas, and we specialize in residential and commercial slab-on-ground and elevated Post-Tension Concrete new construction projects. Time that the client is paying for and which is better spent doing the important work. Concrete X-Ray requires that film be placed on one side of the slab while radiation is released on the other. ( 1 ) . Let us show you how we can maximize the benefits Concrete and Structural X-Ray Services has to offer to your specific needs while minimizing overall costs of non-destructive x-ray services in Southern California including L.A., San Diego Ca, and The Inland Empire area. Locate post-tension cables and other hazards which would otherwise be undetectable with GPR. For the repair and modification of post tensioning (PT) systems as well as post-tensioned concrete structure repair and protection, STRUCTURAL TECHNOLOGIES offers highly specialized products and services including investigation, repair design support, repair and replacement components, corrosion protection products, strengthening solutions as well as new or replacement post-tensioning systems. Expand the survey area if unsure. ART Location Services, Inc. provides concrete X-Ray, GPR and Utility Locating Services to contractors located in San Diego, Orange County, Los Angeles, Riverside and the Southern California region. Welcome to Pro Scan. - Concrete X-Ray cannot be used on residential slab on grade foundations simply because radiation has to be released on one side of the slab while a film that captures the image is on the other. The cost is $400.00 US dollars for one shot !Now thats what my company says it maybe less but its not cheap . Time: Post tensioned slab saves time - thus shuttering can be removed earli. Like a X Ray, a GPR concrete scanner images post tension cables, conduit, pipe, wire, rebar, voids, mesh, tubing, and concrete thickness, to name a few features. My concern is that I don't know if the floor is a post-tension slab or if there is other conduit in the slab. 3. We cannot access both sides of the slab with slab-on-grade foundations. Both sides of the slab have to be accessible to use X-Ray. Digital concrete x-ray imaging involves the non-destructive use of hard X-rays or gamma rays to image the interior of a concrete target to identify and locate rebar, conduit, post tension cables and other embedded objects. These devices are often used to locate reinforcing steel members such as rebar, post-tensioning cables and steel mesh in concrete floors, walls and bridge decks, utility conduits laid beneath or within a building slab, significant air voids, and similar potential obstacles. Ground Penetrating Radar Systems, LLC. ABOUT US. Tendons today are seven high-strength steel wires wound together and placed inside a plastic duct. Scanning a larger area provides more information to discern the layout of the slab structural elements. Avoid Cutting Cables. Scanning, analyzing, and interpreting what's beneath concrete has never been faster or easier. With new build construction and renovation projects, the likelihood of needing to cut or core a concrete slab is high. We help contractors locate post tension cables, rebar and conduit embedded in concrete prior to coring, saw cutting or drilling. The clarity of GPR is high but does not give the same resolution in concrete as x-ray. Concrete Scanning is used to image conduit, pipe, rebar, post tension cables, voids, mesh, concrete thickness. Releasing tension on a prestressed concrete slab is a specialized practice, typically handled by a professional company with lots of experience. With GPR, we can also pinpoint the depth of every object we locate in concrete with an accuracy of +/- 10-15%. GPR is a geophysical method, very similar to sonar, in which electromagnetic waves are sent into […] We use the latest state of the art structural investigation methods and can tailor our services to your project specific requirements. That is not practical for residential slabs. For instance, post-tension cable, rebar, conduit, pipes, fiber optic cables and air voids can all be identified using the 3D imaging capabilities of GPR. Digital Concrete will manage the entire X-Ray process. We locate Post Tension Cables, Rebar, Slab Thickness, Conduits embedded in slabs, walls, balconies, and columns. Each beam had been pre s t r essed to a load of about 750 tons. We help contractors locate post tension cables, rebar and conduit embedded in concrete prior to coring, saw cutting or drilling. Usually the cost is between $400 to $500. however, GPR needs to undertaken by those experienced with it use and who have knowledge of the structural framing system too. GPR can provide depth/thickness estimation of concrete structures while X-Ray usually can't. Using Ground Penetrating Radar (GPR) for concrete structure scanning provides a safe, cost effective and fast alternative to X-Ray! Concrete scanning, also known as concrete x-ray, with ground penetrating radar (GPR) is used to locate and map the positions of metallic and nonmetallic materials such as rebar, post-tensioning cables, conduit, metal and plastic pipes, electrical cables, and other near-surface anomalies and objects in concrete. Structural engineers design the slabs with post tension cables in an effort to make the slab act monolithically to counter the point loads created by the soil. Additionally, we assist both residential and commercial . Maverick makes sure that your request for work is answered immediately and that qualified personnel are dispatched as soon as possible to work with your schedule and timeline. Our equipment provides accurate inspection of concrete structures such as floors, walls, slabs, and bridge decks. Post tension cables create the ability to use thinner and more continuous slabs of concrete. CONCRETE IMAGING & MAPPING. By using GPR technologies, we can provide high-resolution imaging of concrete to map out exactly where post tension cables are and evaluate if there are any failure points. We know how to interpret the film. As Southern Arizona's leading supplier of unbounded post-tension materials, Arizona Post-Tension specializes in all aspects of posts tensioning, involved in slab-on-grade. Per the requirements of ASTM A-416 and typical strand sizes are 0.50 and inch. Much safer than x-rays and can be removed earli be placed on one side of the slab to... 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