PERMEABILITY TESTING OF PLASTIC CONCRETE

Conventional permeability tests on hardened concrete suffer some limitations such as uncertainty of the physics governing the flow. These tests are painstaking and expensive and yield inconsistent results. Testing concrete at the plastic stage is proposed as a way of rationalizing and accelerating the test. As a first step toward full realization of this concept, the permeability characteristics of retarded plastic concrete have been investigated by using a specially designed cell and a falling-head permeameter. During this investigation, particular attention was paid to (a) elimination of the effect of boundary flow on the true values of the coefficient of permeability of the permeate; (b) verification of the validity of Darcy's law for flow-through plastic concrete; and (c) evaluation of the effects of variation in water-cement ratios and the hydration process on values of the coefficient of permeability of the permeate. Results so far available confirm that the Darcy flow is applicable to plastic concrete. The Darcy coefficient of permeability of the mixes used in this project is generally of the order of 10 exp -5 cm/s and increases exponentially as the water-cement ratio increases. The effect of addition of sugar, as a retarder, is to reduce values of the coefficient of permeability of the permeate. Similarly, hydration reduces the coefficient of permeability of the permeate, which decreases with time.

• Record URL:
  • http://onlinepubs.trb.org/Onlinepubs/trr/1975/558/558-011.pdf
• Record URL:
  • https://scholar.google.com/scholar_lookup?title=PERMEABILITY+TESTING+OF+PLASTIC+CONCRETE&author=O.+Uzomaka&publication_year=1975
• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/isbn/0309024668
• Supplemental Notes:
  • Publication of this paper sponsored by Committee on Mechanical Properties of Concrete.Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved
• Authors:
  • Uzomaka, Osondu J
• Conference:
  • 54th Annual Meeting of the Transportation Research Board
  • Location: Washington District of Columbia
  • Date: 1975-1-13 to 1975-1-17
• Publication Date: 1975

Media Info

• Media Type: Print
• Features: Figures; References;
• Pagination: pp 93-103
• Monograph Title: Recent developments in accelerated testing and maturity of concrete
• Serial:
  • Transportation Research Record
  • Issue Number: 558
  • Publisher: Transportation Research Board
  • ISSN: 0361-1981

Subject/Index Terms

• TRT Terms: Accelerated tests; Darcy's law; Hydration; Permeability; Permeability coefficient; Polymer concrete; Retarders (Concrete); Sugar; Water cement ratio
• Old TRIS Terms: Retarders
• Subject Areas: Highways; Materials;

Filing Info

• Accession Number: 00131697
• Record Type: Publication
• ISBN: 0309024668
• Files: TRIS, TRB
• Created Date: Jun 5 1976 12:00AM