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  United States  27695

    Federal Highway Administration

    1200 New Jersey Avenue, SE
    Washington, DC  United States  20590

    North Carolina Department of Transportation

    Raleigh, NC  United States 
  • 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