Technical Papers
Technical Papers
The staff at Olson Engineering has created – and contributed to – numerous technical papers throughout the company’s history. The publications featured on this page are available for download or review and are grouped by their common applications.
Dams
North Carolina Dam Tomography
This paper discusses how Sonic Pulse Velocity (SPV) analysis was used to assess the condition of a concrete arch dam in western North Carolina.
NDT of Dams and Other Structures
An overview of several stress-wave based nondestructive testing methods which can be used to assess the condition of concrete structures such as dams, buildings, and foundations
Assessment of Concrete Dams
There are a number of nondestructive evaluation (NDE) methods applicable to the condition assessment of concrete dam structures. This paper includes a discussion of the methods and their applicability to different types of dams and structures related to dams.
Bridges
IES Method on Post Tension Duct Voids
This paper focuses on imaging and scanning technology based on the rolling Impact Echo (IE) method. The basic background of the Impact Echo technique and its implementation with a rolling scanning transducer are discussed.
Quality Assurance of Crack Repairs
Epoxy injection and a concrete patching material were used to repair cracks in the damaged girder; after repairs were complete, a nondestructive testing program was developed to assure the quality of the repairs.
Unknown Bridge Foundations
A summarization of research work undertaken to evaluate the capabilities of the various nondestructive testing methods to indicate depth and other information on unknown bridge foundation characteristics.
Bridge Load and Stay Cable Testing
This paper discusses bridge displacement monitoring using a remote, noncontacting interferometric phase radar system (IBIS-S) and its results compared to a conventional bridge load test using string potentiometers.
NDE of Bridge Foundations
This article presents an overview of the most common methods used for the evaluation of deep foundations for bridges and other structures, including summaries of the advantages and limitations of each method.
Data Fusion for Bridge Assessment
The use of the data fusion approach is discussed in this paper for the evaluation of concrete bridge decks and girders using photogrammetry along with the NDE methods of GPR, IES, and SASW.
Foundations
Drilled Shaft Investigation
The Crosshole Sonic Logging (CSL), Crosshole Tomography (CT) and Sonic Echo/Impulse Response (SE/IR) methods are discussed along with case studies to illustrate the use of each method to determine shaft integrity.
CSL Tomography of Drilled Shafts
This paper presents a review of the Crosshole Sonic Logging (CSL) method in consulting and research projects and discusses the use of Crosshole Tomographic (CT) velocity imaging of concrete defects in shafts.
NDE of Bridge Foundations
This article presents an overview of the most common methods used for the evaluation of deep foundations for bridges and other structures, including summaries of the advantages and limitations of each method.
Unknown Bridge Foundations
A summarization of research work undertaken to evaluate the capabilities of the various nondestructive testing methods to indicate depth and other information on unknown bridge foundation characteristics.
Tunnels, Pipes, and Conduits
NDE of Concrete Pipe (PCCP)
This paper focuses on imaging and scanning technology based on the rolling Impact Echo (IE) method. The basic background of the Impact Echo technique and its implementation with a rolling scanning transducer are discussed.
Historic Structures
IE Method on the Lincoln Memorial
The IE method was used on the Lincoln Memorial for two different projects: the first was a condition survey of concrete portions of the memorial under the Raised Terrace and Approachway Slabs; the second was a preliminary stone survey.