AN INSTRUMENT FOR DAMAGE ASSESSMENT OF REINFORCED CONCRETE STRUCTURES

Award Information
Agency: Department of Defense
Branch: Air Force
Contract: N/A
Agency Tracking Number: 8727
Amount: $49,998.00
Phase: Phase I
Program: SBIR
Awards Year: 1988
Solicitation Year: N/A
Solicitation Topic Code: N/A
Solicitation Number: N/A
Small Business Information
Innovative Sciences Inc
400 Hester St, San Leandro, CA, 94577
DUNS: N/A
HUBZone Owned: N
Woman Owned: N
Socially and Economically Disadvantaged: N
Principal Investigator
 BRUCE W MAXFIELD
 (415) 568-7720
Business Contact
Phone: () -
Research Institution
N/A
Abstract
QUITE RECENTLY, IT HAS BEEN SHOWN THAT THE IMPACT-ECHO (IE) METHOD CAN YIELD A GREAT DEAL OF INFORMATION ABOUT THE INTERNAL STRUCTURE OF CONCRETE, INCLUDING THE PRESENCE OF CRACKING AND DISBONDED REINFORCING MATERIAL. CAREFUL EXAMINATION OF THE IE METHOD, HOWEVER, SHOWS THAT UNDER MANY CIRCUMSTANCES IT CAN BE VERY DIFFICULT TO INVERT THE RESULTS IN ORDER TO OBTAIN QUANTITATIVE INFORMATION ABOUT THE INTERNAL STRUCTURE. MUCH OF THE AMBIGUITY IN ANY DATA INVERSION PROCEDURE CAN BE REMOVED BY PLACING ADDITIONAL CONSTRAINTS ON THE INVERSION. THIS PROPOSAL SEEKS SUPPORT TO PERFORM FINITE ELEMENT (FE) CALCULATIONS IN ORDER TO CALCULATE THE IE RESPONSE FOR SEVERAL MODEL STRUCTURES CONTAINING CRACKS AND DISBONDED REINFORCING MATERIAL. THESE RESULTS WILL THEN BE INVERTED USING NO A PRIORI KNOWLEDGE OF THE INTERNAL STRUCTURE OR THICKNESS. IN MANY CASES, THIS WILL LEAD TO A VERY POOR QUANTITATIVE INVERSION. INCORPORATING ADDITIONAL INFORMATION ABOUT THE STRUCTURE FROM OTHER NONDESTRUCTIVE MEASUREMENTS SUCH AS MAGNETIC, ELECTROMAGNETIC AND NUCLEAR METHODS WILL BE USED TO IMPROVE INVERSION OF IE RESPONSES.

* information listed above is at the time of submission.

Agency Micro-sites

SBA logo
Department of Agriculture logo
Department of Commerce logo
Department of Defense logo
Department of Education logo
Department of Energy logo
Department of Health and Human Services logo
Department of Homeland Security logo
Department of Transportation logo
Environmental Protection Agency logo
National Aeronautics and Space Administration logo
National Science Foundation logo
US Flag An Official Website of the United States Government