Simulation of Water Pressure on Washout of Underwater Concrete Repair

To evaluate the effect of interfacial concrete/water velocity and hydrostatic pressure on the performance of underwater concrete (UWC) designated for repair applications, a comprehensive research project was undertaken. The CRD C61 test method and a newly developed device enabling concrete washout simulation placed at various depths below water surface level, down to 140 m (460 ft), were used to determine washout loss on 33 optimized mixtures. Test results showed that as water head increased, so did washout loss of UWC. A critical threshold water depth can be found, depending on mixture composition, beyond which significant washout loss could take place. Reducing washout loss for a given depth of casting or enabling the casting in deeper water for a given washout resistance was found to be possible through the effect of decreasing the interfacial concrete/water velocity from 2.5 to 0.5 m/s (8.2 to 1.6 ft/s). Washout losses determined as per the CRD C61 test method and the estimate-derived washout loss given a certain interfacial concrete/water velocity and water depth were shown to have good correlation.

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  • Authors:
    • Assad, Joseph J
    • Daou, Yehia
    • Khayat, Kamal H
  • Publication Date: 2009


  • English

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  • Accession Number: 01150649
  • Record Type: Publication
  • Report/Paper Numbers: 106-M59
  • Files: TRIS
  • Created Date: Feb 16 2010 5:24PM