The Stress Test - OTB Test
OTB Technologies methodology for detecting if a concrete crack is static or dynamic within in a very short period of time.
We at OTB Technologies have developed a methodology for detecting if a concrete crack is static or dynamic within in a very short period of time.
As defined by various industry glossaries, static concrete cracks are cracks that do not move and dynamic concrete cracks are cracks that move. The problems with these definitions are that there is no “time” factor included. A crack may not move for days, weeks or months but then moves and the contractor is held responsible for coating repairs. This is not fair to the contractor.
When a contractor is asked to coat concrete they usually perform a moisture vapor emission test or an in-situ relative humidity test. These tests are a “snapshot” in time – usually 24 hours. They do not represent what the vapor emission or relative humidity may be later or outside this time period. If the test results are within the parameters of what the coating manufacturer allows coating may begin. The contractor has no control of moisture entering the concrete from below the slab, transmitting through the concrete or emitting from the concrete at any time and should not be responsible for it. It is the responsibility of the owner to ensure moisture is excluded from the concrete in all these situations.
This same thinking should be applied for determining if a concrete crack is static or dynamic. For example: If a concrete crack does not move within a 24 hour period the contractor may presume it is static and treat it as such. Conversely, if the concrete crack moves within this 24 hour period it is considered a dynamic crack and the contractor treats it as such. NACE (6G197/SSPC-TU2 pg 16 par 126.96.36.199.1)
"The Stress Test" otherwise known as "OTB TST"™ can determine if a concrete crack is static or dynamic within 24 hours at approximately the cost of a gallon of gasoline.
Stress Test Photos