CHARACTERIZATION OF CONCRETE CONDITION USING ACOUSTIC TOMOGRAPHIC IMAGING

Award Information
Agency:
Nuclear Regulatory Commission
Branch
n/a
Amount:
$172,613.00
Award Year:
1994
Program:
SBIR
Phase:
Phase II
Contract:
n/a
Agency Tracking Number:
20864
Solicitation Year:
n/a
Solicitation Topic Code:
n/a
Solicitation Number:
n/a
Small Business Information
Atkinson-noland & Associates
2619 Spruce St, Boulder, CO, 80302
Hubzone Owned:
N
Minority Owned:
N
Woman Owned:
N
Duns:
n/a
Principal Investigator:
Richard Atkinson
Vice President
() -
Business Contact:
() -
Research Institution:
n/a
Abstract
RESIDUAL LIFETIME EVALUATION OF EXISTING NUCLEAR FACILITIES REQUIRES DETAILED INFORMATION REGARDING CONDITION OF CONTAINMENT AND SUPPORT STRUCTURES. CURRENT NONDESTRUCTIVE METHODS FOR SUBSURFACE EVALUATION OF REINFORCED CONCRETE USE COMPLEX EQUIPMENT AND RELY HEAVILY ON INTERPRETATION BY THE OPERATOR. A RESEARCH EFFORT IS PROPOSED TO EXAMINE THE USE OF COMPUTERIZED TOMOGRAPHIC IMAGING FOR LOCATING SUBSURFACE FEATURES IN REINFORCED CONCRETE STRUCTURES. ACOUSTIC PULSE VELOCITY DATA WILL BE USED AS THE BASE INFORMATION FOR IMAGE RECONSTRUCTIONS. THE APPROACH WOULD PROVIDE A CROSS-SECTIONAL IMAGE OF THE MASS BEING INVESTIGATED, SHOWING THE VELOCITY DISTRIBUTION THROUGHOUT THE INTERIOR OF THE CONCRETE. THE IMAGE OF CONCRETE CONDITION CAN BE ANALYZED AND USED AS A BASIS FOR DETERMINING THE INTERNAL CONCRETE CONDITION AND THE NECESSITY OF REPAIRS. A NUMBER OF INTIAL PROBLEMS WILL BE ADDRESSED, PERTAINING TO DETERMINATION OF APPROPRIATE STRESS WAVE PARAMETERS AND OPTIMIZATION OF DATA GATHERING TECHNIQUES. A MASS CONCRETE SPECIMEN WILL BE CONSTRUCTED TO INCORPORATE FEATURES OF INTEREST, SUCH AS REINFORCING STEEL, DENSITY VARIATIONS, CRACKS, AND VOIDS. THE MAIN PORTION OF THE STUDY WILL CONCENTRATE OF DETERMINING THE ABILITY OF ACOUSTIC IMAGING TECHNIQUES TO IDENTIFY THE PRESENCE AND LOCATION OFSUCH FEATURES.

* information listed above is at the time of submission.

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