The staff at Olson Engineering utilize a variety of NDE and Geophysical test methods as a means to provide answers to client questions and concerns. In this section, we supply method briefs that detail the technical methods most often employed by our team.

STRUCTURAL, PAVEMENT, & TUNNEL

Impact Echo

Impact Echo (IE) investigations are performed to assess the condition of a variety of concrete structures, including slabs, beams, columns, walls, pavements, runways, tunnels, and dams.

Spectral Analysis of Surface Waves

The Spectral Analysis of Surface Waves (SASW) test method is used primarily to assess crack depths, material stiffness, material condition, and layer thickness.

Ultrasonic Pulse Velocity

Ultrasonic Pulse Velocity (UPV) tests are performed to assess the condition of structural members with two-sided access such as elevated slabs, beams, and columns.

FOUNDATION DEPTH & INTEGRITY

Crosshole Sonic Logging

Crosshole Sonic Logging (CSL) tests are used to test the integrity of newly placed drilled shafts, seal footings, and slurry or diaphragm walls.

Crosshole Tomography

Crosshole Tomography (CT) testing is used to accurately characterize the size, location and severity of defects commonly found within newly placed drilled shafts, seal footings, and slurry or diaphragm walls.

Parallel Seismic

The Parallel Seismic (PS) method is used to determine the lengths of deep foundations when foundation tops are not accessible, or when the piles are too long and slender for other test methods.

Sonic Echo / Impulse Response

Sonic Echo/Impulse Response (SE/IR), also called Low Strain Integrity (LSI), Pile Integrity Testing (PIT), etc., are performed to evaluate the integrity and determine the length of deep foundations.

Crosshole Sonic Logging

Crosshole Sonic Logging (CSL) tests are used to test the integrity of newly placed drilled shafts, seal footings, and slurry or diaphragm walls.

Crosshole Tomography

Crosshole Tomography (CT) testing is used to accurately characterize the size, location and severity of defects commonly found within newly placed drilled shafts, seal footings, and slurry or diaphragm walls.

Parallel Seismic

The Parallel Seismic (PS) method is used to determine the lengths of deep foundations when foundation tops are not accessible, or when the piles are too long and slender for other test methods.

Sonic Echo / Impulse Response

Sonic Echo/Impulse Response (SE/IR), also called Low Strain Integrity (LSI), Pile Integrity Testing (PIT), etc., are performed to evaluate the integrity and determine the length of deep foundations.

GEOPHYSICAL

Crosshole Seismic / Downhole Seismic

Crosshole Seismic (CS) investigations are performed to provide information on dynamic soil and rock properties. Downhole Seismic (DS) investigations require only one borehole to provide shear and compressional velocity wave profiles.