Radiant energy – Invisible radiant energy responsive electric signalling – Neutron responsive means
Patent
1992-03-13
1993-11-02
Hannaher, Constantine
Radiant energy
Invisible radiant energy responsive electric signalling
Neutron responsive means
25039004, 2503581, G01N 2300
Patent
active
052586227
ABSTRACT:
An instrument and a method are provided for determining the moisture and cement contents of fresh concrete and for calculating and displaying to the user of the instrument the projected strength of the concrete. The instrument has two probes, each probe containing a low-activity nuclear source. The probes are stored in shielded receptacles in a housing when not in use. The user calibrates the probes with reference to concrete compositions of known cement and water content, and then for field use separately inserts each probe into the access tube of a sample pan filled with concrete to obtain counts corresponding to moisture content and cement content. An electronics unit is attached to the housing for storing the correlations and performing the calculations.
REFERENCES:
patent: 3626183 (1971-12-01), Berry et al.
patent: 3911271 (1975-10-01), Mitchell
patent: 4039809 (1977-08-01), Bailey
patent: 4196614 (1980-04-01), McLaughlin
patent: 4243886 (1981-01-01), Untermyer, II
patent: 4381452 (1983-04-01), Jeunehomme
patent: 4439675 (1984-03-01), Campbell
patent: 4524279 (1985-06-01), Christianson et al.
patent: 4615215 (1986-10-01), Sugimoto et al.
patent: 4686852 (1987-08-01), Ito et al.
Mitchell, Terry M., "Measurement of Cement Content by Using Nuclear Backscatter-and-Absorption Gauge"; Transportation Research Board Record 692 (1978), pp. 34-40.
Iddings, Frank A., and Arman, Ara, "Determination of Cement Content in Soil Cement Mixtures and Concrete"; Engineering Research Bulletin No. 114, Division of Engineering Research, Louisiana State University, Apr., 1977.
Iddings, Frank A. et al., "Nuclear Techniques for Cement Determination"; Nat Acad Sciences--Nat Research Council--Highway Research Rec, n. 268, 1969, pp. 118-130.
Mitchell, T. M., "Nuclear Cement Content Gage--Instruction Manual"; U.S. Department of Transportation Report No. FHWA-RD-75-63, May 1975.
Gulden W., "Nuclear Cement Content Gage--Performance Evaluation"; Georgia Dept. of Transportation, Report No. FHWA-RD-75-525, May 1975.
Tom, J. G. and Magoun, A. D., "Evaluation of Procedures Used To Measure Cement And Water Content In Fresh Concrete"; National Cooperative Highway Research Program Report 284, Jun. 1986.
Shah, S. C. and Melancon, J. L., "Nuclear Cement Content Gage--Comparison Analysis"; Louisiana Dept. of Transportation and Development, Report No. FHWA-TS-78-201; Aug. 1977.
Hime, W. G. and Willis, R. A., "A Method for the Determination of the Cement Content of Plastic Concrete"; Research Department Bulletin 61; Authorized Reprint from the Copyrighted ASTM Bulletin No. 209, Oct. 1955.
Naik, Tarun R. and Ramme, Bruce W., "Determination of the Water Content of Concrete By the Microwave Method"; Cement and Concrete Research, vol. 17, pp. 927-938, 1987.
Kelly, R. T. and Vail, J. W., "Rapid Analysis of Fresh Concrete"; Concrete, Apr. 1968.
Dhir, Ravindra K. et al., "Analysis of fresh concrete: determination of cement content by the Rapid Analysis Machine"; Magazine of Concrete Research: vol. 34, No. 119: Jun. 1982.
Mitchell, T. M., "A Radioisotope Backscatter Gauge For Measuring The Cement Content of Plastic Concrete"; U.S. Department of Transportation, Report No. FHWA-RD-73-48, Apr. 1973 Interim Report.
Industry Report, "Density Gauge Hastens Analysis", Electronics, Oct. 1, 1957, p. 24.
Lepper, Jr. et al., "Nuclear Methods for Determining the Water Content and Unit Weight of Fresh Concrete", Journal of Materials, vol. 6, No. 4, 1971, pp. 826-841.
Glick Edward J.
Hannaher Constantine
Troxler Electronic Laboratories, Inc.
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