Based on years of research, development and experience at the Technical University of Denmark, and in cooperation with FTC, Dynatest has introduced three series of precision transducers for the measurement of in-situ stresses and strains, primarily for highway and airfield pavements.

• The Dynatest PAST Series:
  (PAvement Strain Transducers) for the measurement of strains in AC (Asphalt Concrete) or PCC (Portland Cement Concrete) pavements.
• The Dynatest SOPT Series:
  (SOil Pressure Transducers) for measurement of Pressure (stress) in unbound materials like gravels, sands or clays.
• Dynatest SSDT Series:
  (Soil Strain Deformation Transducers) based on precision LVDT for deformation measurements in unbound materials.

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The Need For Measurement of In-situ Stresses and Strains

Today, several computer programs based on elastic theory are available for the computation of stresses and strains in pavement structures.
The Dynatest PAST, SOPT and SSDT series transducers may be used to verify these computed values.
This is very important, as stress or strain in a certain layer of a road construction is normally used as the critical parameter for determining the performance of pavement sections, including the service life as a function of the number of imposed wheel loads.

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Dynatest Transducers: Time Tested Reliability

Dynatest series PAST, SOPT and SSDT transducers are precision instruments that have been developed and constructed for their specific purpose based on more than a decade of in-situ experience.

The latest technology and the highest quality materials have made these transducers especially resistant to the often tough environments in which they will be used.
The end result is long service and fatigue lifetimes.

Installations of Dynatest Gauges:

Total = 1181 PAST II AC,
Total =  192 PAST II PCC,
Total =  116 SOPT gauges
By:

American Association of Railroads
The Boeing Company
Caltrans
Carolina Dept. of Transportation
Cornell University
CRREL
Construction Technology Lab.
Des Moines Asphalt
Gas Technology Institute
Kansas State University
Ministry of Transportation, Quebec North Minnesota Dept. of Transportation
Montana State University
North Carolina DOT
Ohio University
Penn. State University
PCS Law Engineering
Pennsylvania State University
Purdue University
Trow, Ltd
University of California (Berkeley) - APT Project
University Illinois
University of New Hampshire
University of Ohio
WES / U.S. Army Corps of Engineers
Virginia Tech - Smart Road Project
Worcester Polytechnic Institute

Lunds Universitet, Sweden
ScandiaConsult, Sweden
VTI, Sweden
Vägverket region väst, Sweden

National Research Council, NCR-CNRC, Canada
Pavmatec / John Emerald Geotechnical

University of Canterbury, New Zealand

Queens University, Belfast, Northern Ireland

Saeyang Engineering Company, South Korea

Promat Ltd. Hong Kong

Vejdirektoratet, Denmark

1 and 1/2 Soil Pressure Transducer (SOPT).

Dynatest International
rev. 040101-10