The water-cement ratio of fresh concrete is recognized as the one factor that affects the strength and durability of an adequately compacted concrete mix. Although water-cement ratio is the predominant factor affecting strength of hardened concrete, currently no widely used, reliable method is available for measuring water-cement ratio in the field. A prototype device has been developed to measure the water-cement ratio of a plastic concrete mix. The method is based on the measurement of turbidity of water-cement slurry separated out of a concrete mixture by pressure sieving. Consistent results were obtained for air-entrained and non-air-entrained concrete. Statistical analyses of the test results have shown that this meter can measure the water-cement ratio of fresh concrete with an accuracy of +/-0.01 on the water-cement ratio scale for a single test at a 90% confidence interval. The equipment will cost less than $10,000. If the method works as well in the field as it does in the laboratory, accurate determination of water-cement ratio could dramatically improve the ability of the concrete industry to ensure the quality of concrete construction.


  • English

Media Info

  • Features: Figures; References; Tables;
  • Pagination: p. 73-79
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00727338
  • Record Type: Publication
  • ISBN: 0309059046
  • Files: TRIS, TRB
  • Created Date: Oct 22 1996 12:00AM