EVALUATION OF A NUCLEAR GAGE FOR CONTROLLING THE CONSOLIDATION OF FRESH CONCRETE
This study evaluated the use of a nuclear gage for controlling the consolidation of in-place, fresh portland cement concrete. The gage was used in the backscatter mode on low-slump concrete overlays and in both the backscatter and direct transmission modes on continuously reinforced concrete pavements. It was found that the nuclear gage gave readings comparable to the standard unit weight values. However, concretes from both the deck and the pavement indicated the presence of coarse voids in amounts exceeding those found in adequately consolidated concretes. Thus, it was concluded that because of the normal variability in density resulting from variations in the grading and amounts of individual ingredients of concrete mixtures, including the air content, the nuclear gage measurements cannot detect small but detrimental amounts of large voids resulting from inadequate consolidation. The presence of an appreciable amount of honeycombing or excessive air entrainment would be detected by nuclear density measurements however. (FHWA)
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- Record URL:
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Corporate Authors:
Virginia Highway and Transportation Research Council
Charlottesville, VA United StatesVirginia Department of Highways
Traffic and Planning Division, 1221 East Broad Street
Richmond, VA United States 23219Federal Highway Administration
1200 New Jersey Avenue, SE
Washington, DC United States 20590 -
Authors:
- Ozyildirim, H C
- Publication Date: 1981-1
Media Info
- Pagination: 28 p.
Subject/Index Terms
- TRT Terms: Accuracy; Air entrainment; Consolidations; Continuously reinforced concrete pavements; Control; Nuclear phenomena; Nuclear powered ships; Overlays (Pavements); Portland cement concrete; Void ratios
- Old TRIS Terms: Nutrient content; Void
- Subject Areas: Highways; Materials; I32: Concrete;
Filing Info
- Accession Number: 00345097
- Record Type: Publication
- Report/Paper Numbers: FHWA/VA-81/41 Final Rpt., VHTRC 81-R41
- Files: TRIS, USDOT, STATEDOT
- Created Date: Jan 29 1982 12:00AM