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.

  • Supplemental Notes:
    • Sponsored in part by North Carolina Dept. of Transportation and Highway Safety, Raleigh. See also Par 1, PB-293 931.
  • Corporate Authors:

    North Carolina State University, Raleigh

    Raleigh, NC  USA  27695

    Federal Highway Administration

    1200 New Jersey Avenue, SE
    Washington, DC  USA  20590

    North Carolina Department of Transportation

    Raleigh, NC  USA  27611
  • Authors:
    • Mullen, W G
    • Bodvarsson, G W
  • Publication Date: 1978-6

Media Info

  • Pagination: 92 p.

Subject/Index Terms

Filing Info

  • 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