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GPRS Conducts Concrete Investigation & Analysis Prior to Demolition

GPRS recently completed a concrete investigation and analysis at the University of Michigan School of Dentistry in Ann Arbor, MI. The project that GPRS was working on was being overseen by Granger Construction and John E. Green Company. The scope of the project was increased upon arrival as multiple contractors onsite are planning to core drill many locations throughout a roughly 7,500SF room on the 3rd floor. The elevated slab being cored has steel rod that cannot be hit when drilling.

The main concern that the contractors had was getting all of the steel rod travelling north and south in this room marked out. Getting information on the elevated slab was vital for the contractors and the university because the structural integrity of the floor could not be jeopardized. Understanding the importance and accuracy of this, they reached out to GPRS.

Upon arrival to the site, GPRS was escorted to the area to be scanned. The original scope was to scan approximately 36-40 core locations on the 3rd floor. Once the scan area was reached GPRS was informed that the entire room needed to be scanned. What was to be at most 80SF of scanning, and a half day on site, quickly turned into 7500SF and multiple days onsite.

With this new information, arrangements were made to make sure the client was taken care of. GPRS proceeded to walk the area down with the site foreman, and discuss the desired results and information that was needed. Once a game plan had been put in place to tackle the area in sections, GPRS got to work.

Right away GPRS knew that scanning this room was going to be a process due to the amount of work being performed by other contractors in the same space. The sheer amount of equipment, materials, and mobile operating equipment also created a multitude of obstacles for GPRS to navigate. To properly scan the concrete, GPRS would have to work with everyone onsite as a team to coordinate work areas. After extensive communication and relocation of materials, we were ready to scan.

GPRS utilized the structure mini xt concrete scanner to scan the top of the elevated slab. Grid scans were used to get an accurate layout of the elevated slab and to confirm the type reinforcing used. Upon scanning GPRS discovered that the elevated slab was not very thick at all, ranging between only 3”-4” thick, it was no wonder the steel rod was so important to not core through. While there were beams detected as well, the rods could not be compromised. The slab thickness made this even more evident.

Potential conduits, beams, and all of the steel rod travelling north and south was marked out by GPRS per the request of the client. The rod was spaced roughly 8”-10” on center. This spacing made marking out each and every rod a very meticulous endeavor. All of the information and markings provided by GPRS were vital for the client.

GPRS was able to determine thickness, quantity and spacing of steel rods, beam locations, and paths of potential conduits. Although most, if not all of the potential conduits had previously been cut and abandoned, the client still had concerns. GPRS was more than happy to alleviate any worry. After scanning with GPR, passive sweeps with the EM pipe locator were conducted to pick up any radio or power tones within the slab.

Ground penetrating radar is a very beneficial service to implement during any construction project. Whether it’s concrete scanning or private utility locating, GPRS is a step ahead of the rest when it comes to making sure a project stays on track and most importantly of all – everyone stays safe. We are the best at what we do, because it is all we do.

GPRS does not provide geophysical, geological, land surveying or engineering services. If you need such services, please contact an appropriate professional.

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