Near-surface characteristics of concrete: assessment and development of in situ test methods

The British Standard initial surface absorption test (ISAT), Figg hypodermic methods (air and water), and a new test, the covercrete absorption test (CAT), have been used to study the permeation properties of the near-surface of concrete. The test methods are critically appraised. It is shown that the moisture condition of the concrete can greatly alter the results obtained. Data on the surface quality of concrete and its dependence on mix proportions and degree of moist curing are presented.