DETERMINATION OF AIR VOID CONTENT AND MIXING WATER VOID CONTENT OF HARDENED CONCRETE USING ELECTRON MICROSCOPE TECHNIQUES. PART III. DETERMINATION OF WATER-CEMENT RATIO AND DEGREE OF HYDRATION OF HARDENED CONCRETE USING ELECTRON MICROSCOPE TECHNIQUE
For the analysis described in Part III, concrete samples of water-cement ratios ranging from .40-1.20 were prepared. The hydration time allowed, representing degree of hydration, varied from 1 day to 90 days (almost 100% hydration). SEM microphotos were taken at high magnification at each level of hydration for each of the water-cement ratios. The microphotos were then examined with emphasis upon trends that would aid in distinguishing between water-cement ratios and degree of hydration. A set of photographs was selected to illustrate an array scheme that is proposed to be developed for estimation of water-cement ratio and degree of hydration of an unknown based upon capillary morphology changes. Presented along with the proposed scheme is a selection of characteristic features that were identified as being indicative of water-cement ratio and/or degree of hydration. It is suggested that these features be utilized in these cases where determination strictly by the proposed standard is not sufficiently accurate.
- Sponsored in part by North Carolina Dept. of Transportation and Highway Safety, Raleigh. See also Par 1, PB-293 931.
North Carolina State University, RaleighRaleigh, NC United States 27695
Washington, DC United States 20590
- Mullen, W G
- Bodvarsson, G W
- Publication Date: 1978-6
- Pagination: 92 p.
- TRT Terms: Air entrainment; Concrete; Electron microscopes; Failure; Hydration; Inspection; Statistical analysis; Vision; Water cement ratio
- Subject Areas: Data and Information Technology;
- Accession Number: 00191757
- Record Type: Publication
- Source Agency: National Technical Information Service
- Report/Paper Numbers: ERSD-110-75-2-PT-3, FHWA/NC-75/2-1
- Files: NTIS, USDOT, STATEDOT
- Created Date: Jun 30 2002 12:00AM