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Title: Permeability of Concrete Using a Uniaxial Water-Flow Method

Author(s): A. Bisaillon and V. M. Malhotra

Publication: Special Publication

Volume: 108

Issue:

Appears on pages(s): 175-194

Keywords: coefficient of variation; concretes; measuring instruments; permeability; test equipment; tests; water-cement ratio; General

Date: 8/1/1988

Abstract:
Paper describes the modifications made to a previously developed CANMET test method to measure the permeability of concrete and discusses test results to determine the reproducibility of the test method. Briefly, the test method consists of measuring the uniaxial water flow through cylinders (125 mm high with a diameter of 150 mm) under a pressure of 3.5 MPa. A large number of concrete specimens with water-cement ratios of 0.65 and 0.80 were tested. A limited number of test specimens having w/c of 0.22 and 0.27 were also tested. Test results show that the within-batch variation for the test method is high, and this is probably due to the heterogenous nature of the concrete. For concrete with w/c of 0.22 and 0.27, there was no outflow of water, and this technique in the present form may not be suitable for measuring the permeability of very high strength concrete.