Surface tests to determine transport properties of concrete – I: the tests
In this chapter, non-destructive surface permeability tests for in situ use are presented together with a ‘vacuum preconditioning’ method to make them more accurate. The main tests are the initial surface absorption test (ISAT) and the Figg test, and these are described. The ISAT measures water transport through the surface of concrete and the Figg measures air transport into a drilled hole. Additional tests are also described. A method for preconditioning the concrete by drying it with a vacuum and using indicating silica gel to monitor the progress is described. Experimental results are presented to show this is very effective.
initial surface absorption ...