Design of an in situ steady-state permeability test to determine the air permeability of covercrete

K. Yang, P. A.M. Basheer, A. E. Long, S. Nanukuttan, C. Yang, Y. Wang, S. Mu

Research output: Chapter in Book/Report/Conference proceedingChapter

Abstract

An in situ permeability test method that does not require assumptions for the uni-directional flow has been developed to determine the air permeability coefficient of the near surface concrete. The proposed method involves applying a constant pressure head to a surface mounted ring and measuring steady state air flow rates. The analysis is based on modification of the flow net theory, which needs a calibration factor accounting for the influence of specimen and ring geometries. Effects of test area, width of seal, depth and width of test specimen were investigated using numerical simulation of air flow. The results indicated that the value of the calibration is very sensitive to change of testing area which needs to be corrected for a specimen with a depth less than 50 mm. The experimental studies suggest the duration to achieve the steady state depends on the quality of the concrete tested and the applied pressure. The results indicated that the test method is capable of identifying the difference in quality of concretes.
Original languageEnglish
Title of host publication6th International Conference on Durability of Concrete Structures, ICDCS 2018
PublisherWhittles Publishing Limited
Pages525-531
Number of pages7
ISBN (Print)1849953945
Publication statusPublished - 2018

Publication series

Name6th International Conference on Durability of Concrete Structures, ICDCS 2018

Keywords

  • Covercrete
  • Flow net
  • In situ air permeability test
  • Steady-state state

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    Yang, K., Basheer, P. A. M., Long, A. E., Nanukuttan, S., Yang, C., Wang, Y., & Mu, S. (2018). Design of an in situ steady-state permeability test to determine the air permeability of covercrete. In 6th International Conference on Durability of Concrete Structures, ICDCS 2018 (pp. 525-531). (6th International Conference on Durability of Concrete Structures, ICDCS 2018). Whittles Publishing Limited.