Crosshole Sonic Logging

The Crosshole Sonic Logging system is the most accurate and reliable technique for assessing the integrity of deep foundation elements constructed on-site from concrete or grout. The system is designed for testing of newly placed critical drilled shaft foundations and auger cast piles, slurry walls, mat foundations, and mass concrete pours. Using water-filled access tubes, CSL testing provides assurance that the foundation concrete is sound with no defects such as soil intrusions, necking, sand lenses, voids, etc.
Sonic Echo-Impulses Response

The Sonic Echo-Impulse Response system is designed to determine the length and integrity of foundations when the top or part of the upper side of the foundation is accessible for new and existing foundations. This method works best for columnar type foundations such as piles and drilled shafts, but has also been used successfully on mat foundations, abutment walls, and similar structures. Sonic Echo/Impulse Response is applicable on concrete, wood, and round steel pipe foundations.
Impact Echo

Impact echo (IE) investigations are performed to assess the condition or thickness of slabs, beams, columns, walls, pavements, runways, tunnels, and dams. The Impact Echo (IE) system is designed to determine the condition and thickness of concrete, wood, stone, and masonry structural members when voids, honeycomb, and/or cracks are suspected. IE investigations can also be performed to predict the strength of early age concrete if the member thickness is known.
Slab Impulse Response

The Slab Impulse Response (SIR) system is designed to identify subgrade voids below slabs-on-grade less than two feet thick. In addition, the Slab IR test method can be used on other concrete structures to quickly locate areas with delaminations or voids in the concrete, if the damage is relatively shallow. Slab IR can be performed on reinforced and non-reinforced concrete slabs as well as asphalt or asphalt-overlay slabs.
Crosshole/Downhole Seismic

Crosshole/Downhole Seismic (CS/DS) investigations provide information on dynamic soil and rock properties. The Crosshole Seismic (CS) system and method determine shear and compressional wave velocity versus depth profiles. From these measurements, parameters, such as Poisson’s ratios and moduli, can be easily determined. In addition, the material damping can be determined from CS tests. These dynamic soil and rock properties are often utilized for earthquake design analyses necessary for certain structures, liquefaction potential studies, site development, and dynamic machine foundation design.
Spectral Analysis of Surfaces Waves

Spectral Analysis of Surface Waves (SASW-G) investigations are typically applied to assess material properties of soil and rock. The Spectral Analysis of Surface Waves (SASW-S) system is designed to measure the in-place shear wave velocity profile of soil and rock without requiring a borehole. In general, the method uses the dispersive characteristics of surface waves to determine the variation of the shear wave velocity (stiffness) of layered systems with depth.

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