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South Carolina Department Of Natural Resources - Fort Johnson
GEL Geophysics, LLC conducted visual inspection and non-destructive testing (NDT) of a concrete floor slab, and supporting beams and columns at the client's facility. The NDT portion of the investigation involved the use of GPR, Cover Meter, Half-Cell Potential, and Rapid Chloride Test. The objective of the investigation was to determine the present condition of the structure and the potential for future damage. Several degraded structural conditions were found, including deteriorated reinforcement, spalled concrete, cracked concrete, and rust-stained concrete, all of which demonstrate some degree of structural failure. Through the use of NDT, additional areas within the slabs and beams were identified where reinforcement corrosion had begun, but had not progressed enough to become visible. There was evidence of overall salt intrusion into the concrete both from the top and bottom sides of the slab and beams. Most importantly, the test results generally showed that the concentration of salts exceeded the baseline that is acceptable before the onset of corrosive action on embedded reinforcement. Therefore, to mitigate further damage, recommendations were made as to how to maintain the concrete structures.
HARTRAMPF
GEL Geophysics performed a GPR investigation of the Las Palmas de San Josa Bastion of the San Juan National Historic Site in Old San Juan, Puerto Rico. Observations of cracks on the top cap section of the Las Palmas de San Josa Bastion raised concerns regarding safety and the possibility of wall failure. The purpose of the GPR investigation was to determine the extent of the noticeable fracture plane within the wall. GPR systems configured with 500 MHz and 800 MHz shielded antennas were used for these investigations. Data was collected in grids on the wall top and in arbitrary patterns on the wall face and in the plaza. Although the crack fill material and distinct building materials were traceable through the dataset, no obvious crack trends or shear fault planes were identifiable.
Newton Builders
GEL Geophysics, LLC conducted GPR and Cover Meter (CM) surveys of numerous areas of concrete block walls inside a new shopping center which was under construction in Myrtle Beach, South Carolina. The purpose of the investigation was to identify reinforcement location, pattern, and other details of the reinforcement in order to confirm that the walls were built to design specifications. The GPR and CM investigations were used to determine the cover thickness, and the reinforcement pattern and spacing. Several sections of the walls investigated were missing vertical reinforcement in critical structural support areas. Additional reinforcement was able to be installed in these critical areas prior to completion of construction activities.
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