• Concrete Scan For Post Tension Cables

    GPR Concrete Scan For Post Tension Cables

    GPR concrete scanning

    for post tension cables

    before cutting the


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Nondestructive testing with GPR Concrete Scanning Services

used to image conduit, pipe, rebar, post tension cables, voids, mesh, concrete thickness. Like a X Ray .

Locate underground utilities using a concrete scanner. 2-D and 3-D images or maps are created by processing and printing the ground penetrating radar results. Hire a geophysicist to do the concrete scanning. Contact Art Fromm, a professional geophysicist who founded his company in 1985. He is dedicated to near surface geophysical applications (see Geophysicss.com). He has not only used ground penetrating radar to characterize concrete, he has successfully surveyed environmental sites, ice thickness in the arctic circle, ponds, dams, archaeological sites, cemeteries, graves, tile lines, utilities, and mine operations. As a ground penetrating radar concrete scanner he personally conducts and oversees the NDT ground penetrating radar surveys. Having spent a vast amount time in the field with sophisticated electronics, he is also capable of maintaining much of the equipment he owns, which leads to less down time.

Click here for geophysical services for geophysicists, engineers, geologists, military, and underground utility locators. These geophysical services are often used to map geology, locate underground storage tanks UST, find graves, archaeological investigations, map contamination, determine ice thickness, locate utilities, mining, map fracture and fault systems, shear wave surveys using MASW, detect voids, forensic investigations, agriculture, finding drain tiles, forestry, military investigations, and security applications. Many of these applications also fall into the category of engineering geophysics. A wide range of equipment can be rented from K. D. Jones Instruments.

In Fromm Applied Technology’s opinion

Desirable concrete scanning has to do with the personal approach of the concrete scanner.

Today we have available to us some of the greatest geophysical instrumentation ever manufactured. A geophysicist or concrete scanner needs to design his ground penetrating radar surveys around the site conditions and the clients desired level of confidence. However, the client needs to understand and accept that the laws of physics apply to concrete scanning and these laws need to be respected by the client for the concrete scanner to deliver desirable results. Then and only then geophysical non-destructive testing, such as GPR, can be implemented by a concrete scanner for utility locating, measuring concrete thickness, locating post tension cables, finding voids, locating plastic or PVC pipe, and as a rebar locator.

Concrete Scanner Avoid Hitting Rebar for 60 Core holes

Concrete Scan 5×5 ft Area to Avoid Hitting Rebar for 60 Core holes

Estimators and proposal writers, when preparing a bid or responding to a quote requiring a concrete scanner be careful who or what you ask for. You are the people who create the budgets for the subcontracted services. You are part of the process for finding someone who provides reasonable services that can demonstrate due diligence was exercised.  A concrete scanner who provides professional services, often directly to architects, engineers, an upper management, is not typically in the business of providing concrete scanning services to fulfill a line item in a contract. I found over the years that concrete scanners are divided into two general groups. The first group provide concrete scanning as professional services and generally charge $1000 to $2000 per day per scanner. They also provide a written report with colored graphics. The second group of concrete scanners generally provide services to supplement or perpetuate their primary business. Their primary business is often in the construction trades and charge $300 to $500 per day. Don’t get me wrong, I am certain this second group of concrete scanners are good people with good intentions. However, their company’s primary concern is how fast can they get approval from a project manager or supervisor to cut the concrete. I have seen contractors cut through marked lines. There are some (not all) who’s only concern is to come in, cut, and install plumbing lines,  heating lines, electrical lines, or pour the new slab. When something is hit, they commonly fall back on the argument that there are not any guarantees in geophysical applications. This mind set leads to the customer saying GPR doesn’t work and has the tendency to undermine the credibility of GPR concrete scanning. GPR works. Support of the above opinion is provided by reviewing the typical fees charged for professional services in general. There are few professional services offered for an average cost of less than $1800 per day. One needs to ask why doesn’t the 2nd group charge these rates? In my opinion, I believe it is because they are making their money on something else and provide concrete scanning to get the contract. I am not sure that engineers, architects, project managers, and building owners and operators would appreciate this approach, especially, after something was hit and they found out how their concrete scanner was hired.  Additional support of the above opinion is provided by searching for other internet sites that offer concrete scanning services. Take a look at their content. Many sites that offer a concrete scanner at the lower rate offer a very limited amount of information about concrete scanning, which, at times, correlates to the services they provide. While this may be an overstatement of the types of concrete scanners and services, I am certain that this discussion rings true with those of you who have been there and done that. Click here  to better understand the theory behind ground penetrating radar concrete scanning. Click here to better understand ground penetrating radar concrete scanning technology.

Ask before you contract,

who is the concrete scanner, an experienced geophysicist or?

For your next survey

Contact: Fromm, Arthur-Licensed Professional Geologist/Geophysicist-Started 1985-Conducted over 900 geophysical surveys.

For help, fill out ConcreteScanner.Com’s form.

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We will respond.

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Basic Contact Form for Geophysical Services

30 Responses to Concrete Scanner for Ground Penetrating Radar Concrete Scanning Services NDT

  1. Concrete Scan 200 Locations August 9, 2013 at 6:39 am #

    Dear sir, we need to scan the MS conduit pipes already laid in the slab , the scaning is required becauce we need to do core cutting for plumbing works , the no of holes is around 200, and this may increase please give your location to find.

    • Concrete Scanner August 9, 2013 at 9:16 am #

      Would all of the concrete scanning be done all at one time? Or, would a few GPR surveys be done, wait a period of time, and then do some more? Where do you need a concrete scanner?

      • Concrete Scan 200 Locations August 9, 2013 at 10:48 am #

        we can do all at a time ,after confirming the conduit abscene area Trivandrum , india

      • Concrete Scanner August 9, 2013 at 11:51 am #

        Thank you for your inquiry. It sounds like a great concrete scanning project. However, I do not have a GPR system or a concrete scanner in the Trivandrum area at this time.

  2. Low Cost GPR July 15, 2013 at 5:26 pm #

    I need an inexpensive way to scan 8 floors in the same area for rebar or pipes before we drill. Need lowest cost possible and work asap. Job is in Hialeah.

    • Concrete Scanner July 16, 2013 at 2:38 pm #

      What do you mean by low cost?

      • Low Cost GPR July 16, 2013 at 2:52 pm #

        Couple of $1000

        • Concrete Scanner July 16, 2013 at 3:35 pm #

          Unless you need a concrete scanner to survey one or two locations per floor I think you need to rethink costs. If you find a concrete scanner to do that volume of concrete scanning for a “couple of $1000,” I suspect you may want to budget for repairs. You often get what you pay for.

  3. Buy A Concrete Scanner June 24, 2013 at 1:10 pm #

    I’ve just found your website coincidentially, looking for refferences to buy online a Concrete Scanner for my father. We just know about this HILTI PS 1000 (He’s actually looking for PS2000 which was not on the internet). It was really usefull to have found your web page but the thing is, we don`t know much about companies that produce this kind of device. We live in Colombia, south America. My father just finished a master’s degree in Material’s Pathology Analysis and it`ll be really helpfull for him and his team to include this in their work equipment. Basically what would be important to get for them it’ll be a scanner that can detect diameter, separation, thickness and depth for steel in reinforced concrete structures. Can you reccommend or suggest anything or maybe, tell us about a price range or something? Thank you and again very interesting website, Have a very nice day.

    • Concrete Scanner June 25, 2013 at 7:23 am #

      There are a couple of different concrete scanners manufactured. While the physics behind the technology is basically the same, the packaging and ability to create long term documentation of the GPR results is important to me. I used Sensors & Software Ground Penetrating Radar systems for a couple of decades. I am comfortable with their Conquest, Noggin, and pulseEKKO systems. I find that the Conquest works well for small areas, while the Noggin or pulseEKKO systems have few limitations and are able to image any size area. I often create plan view plots of entire rooms 10’s of feet in size. I also find that a concrete scanner needs to be able post process the results to get the greatest sensitivity.

  4. Beneath Basement Floor June 1, 2013 at 4:46 pm #

    How much would it cost to find out what (if anything) is beneath 3 basement rooms in a house in Minneapolis?

    • Concrete Scanner June 2, 2013 at 7:50 am #

      To use a GPR concrete scanner, I need to know a little more about the site. I am assuming the floor is concrete. Do you know what type of reinforcing material is has? What are the dimensions of the three rooms? How are they shaped? Are the rooms open and clear of any features that can obstruct the concrete scanner survey? Also, what do you mean by “anything?” I need to know the size and what you are looking for? Metal, voids, plastic, and other all respond differently to GPR. Also, how deep are you interested in investigating? Is the basement large enough to stand up in? What is the application (e.g., business, personal, or government)?

      • Beneath Basement Floor June 2, 2013 at 10:34 am #

        The ceilings are about 7′-6″ high in two of the rooms, and about 9′ high in the other room. (guestimates) The floors are made of concrete, and I have no idea what the reinforcing material is, although the original blue prints indicate that a 3/8″ diameter reinforcing rod was used in the concrete floors, as it was built in 1921. The rooms are approximately 14′ X 10′, 14′ X 10′, 10′ X 23′. The rooms are clear and open.

        By “anything”, I am just curious as to if there is anything under the floors for 2 reasons:
        1.) The floors in 2 of these rooms sound hollow when one jumps on them. Which is odd to me.
        2.) We already know that there was some bootlegging activity done on the premises back in the day (not too surprising, as it was built during prohibition),so I was curious if there was a connection there. It might just be nothing….possibly just a void under the floor. It is just my curiosity about the house that makes me want to find out everything I can about it. The application is personal and am an architect. I am super excited to just find out everything I can about it. I was asking an archaeologist friend of mine about ground penetrating radar and your site is one of the two she recommended I contact.

        • Concrete Scanner June 2, 2013 at 11:59 am #

          Depending on the level of confidence you are looking to achieve, it would take a concrete scanner one or two days to geophysically characterize the subsurface using GPR. If you want great detail, the concrete scanning would need to be done on a grid with perpendicular lines spaced about 3 inches apart. Based on your response (not looking for utilities in the concrete, interested in large voids imediately below the slab, you expect rebar so wire mesh does not seem to be an issue, and this is a personal application), the three rooms could be concrete scanned with a 1000 MHz GPR system in one day, assuming lines are spaced fairly far apart in two perpendicular directions. However, if this was a commercial application that involved penetrations, I would expect you would want a higher level of confidence. A higher level of confidence is associated with more closely spaced lines and would take a second day on site.

          • Beneath Basement Floor June 2, 2013 at 2:21 pm #

            Would I see what is in the voids?

          • Concrete Scanner June 2, 2013 at 6:14 pm #

            The high frequency GPR will likely respond well to the top of a void but after that it is difficult to know what the signal will do. To determine the thickness of a void is often difficult unless it is fairly deep or large. The signal has a tendency of bouncing around inside the void.

  5. Rebar Scanner Saudi Arabia May 9, 2013 at 9:39 am #

    We have concrete members. We want to check the reinforcement by Rebar Scanner. Is your Rebar scanning service available in dammam (Saudi Arabia).

    • Concrete Scanner May 9, 2013 at 10:42 am #

      I do not have a GPR concrete scanner in Dammam at this time. I am forwarding your request to Sensors & Software, the manufacture of the equipment I use most of the time. They may be able to provide you with a contact that is near you.

  6. Gold In A Gully April 19, 2013 at 3:37 pm #

    search for gold in a filled gully

    • Concrete Scanner April 20, 2013 at 9:42 am #

      Unless you are looking for a vein in a rock formation or buckets of gold, it is very difficult to locate gold using any type of GPR. I am not going to say it has not been done but it almost takes a crystal ball. However, if you have specific geologic conditions (e.g. a bedrock depression or a type of overburden you are looking to locate), more general geophysical methods may assist you. A 1000 MHz concrete scanner would likely penetrate less than a foot or two, if solid rock or dry sand.

      • Gold In A Gully April 20, 2013 at 1:48 pm #

        There’s a gully maybe 40 yards wide that has been filled in over time. The center of the gully under all that fill is roughly 20-30 ft deep. There is gold there (drilled and confirmed). My thought was to walk the gully with a GPR and seek out drops (like baby waterfalls) in the gully floor (under all that sand) where gold concentrations would be at their maximum. I’m sure the unit can provide this 3d image of the floor and any drops (can it?). I am hoping it may also be able to discern any metallic items (alluvial gold concentrations) in those drops to confirm the presence so digging is not in vain. We don’t want to excavate the entire gully running through a wash plant of we can cherry pick the deposits.

        • Concrete Scanner April 20, 2013 at 2:11 pm #

          Unlike many people who ask for assistance, you are trying to better define the geology. The big question is what type of access do you have. Is it very brushy or a lot of boulders or other obstacles. The best results are obtained from areas with sand and gravel and little water at depth. A lower frequency ground penetrating radar unit could possibly reach these depths of interest. The best results are obtained by constructing a grid and collecting data in two perpendicular directions. As for detecting gold, the deposits are typically too sparse. It isn’t so much the thickness but the lateral extent. You would likely need a nearly continuous layer of gold that is a couple of meters in diameter. I am sure you would be happy to find such a deposit but how often does that occur.

  7. Thick Concrete March 21, 2013 at 12:33 pm #

    I am in the Jackson Ms area, and I work for Storm Ready Shelters. We have sold an above ground shelter to a home owner in the area that has post tension cables. I am trying to determine how to drill without damage.

    • Concrete Scanner March 22, 2013 at 3:04 pm #

      How thick is the concrete?

      • Thick Concrete March 26, 2013 at 11:32 am #

        Need to locate rebar in 27″ thick mat

        • Concrete Scanner March 29, 2013 at 1:07 pm #

          Submitted on 2013/03/30 at 1:07 pm | In reply to Thick Concrete.

          Often a Sensors & Software 1000 MHz GPR unit is used to scan concrete for rebar, cables, pipe, and post tension cables. The higher frequency antenna provides greater detail. However, you indicated that you want to reach depths of penetration up to 27 inches. If there are not many shallow targets in the 27 inch slab you may get better penetration with a lower frequency 500 MHz antenna. However, you will loose resolution with the 500 MHz antenna, which can effect the ability to delineate smaller diameter targets at depth. In either case, this may be a difficult task.

  8. Garage Slab March 2, 2013 at 10:41 am #

    I am looking for a way to locate post tension cables in a garage conccrete slab.

    • Concrete Scanner March 2, 2013 at 11:22 am #

      High frequency ground penetrating radar is often used to locate post tension cables. Often a 1000 MHz antenna is used; however, if you requie greater depths of penetration you may want to consider a 500 MHz GPR antenna. Please realize there are other factors that may contribute to desirable results.

  9. New Green Concrete February 13, 2013 at 9:59 am #

    Have newly poured concrete slab 22′ x 36′. Location Northeastern MI. Need to determine thickness, between 3″ to 6″.

    • Concrete Scanner February 13, 2013 at 11:05 am #

      Ground penetrating radar does not perform well over newly poured concrete. While the concrete may be hard enough to walk on there remains, for some time, electrically conductive moisture within the pores. I also believe there is a significant amount of chlorides in the concrete that can increase the conductivity of the concrete. How old is the slab? How soon do you need to determine the concrete thickness?

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