Near-surface Characteristics Research Articles

Near-surface characteristics of concrete: prediction of carbonation resistance

The relationship between the intrinsic permeability and the Carbonation of concrete is examined. It is shown that the Figg air index test, which is portable, cheap and simple to operate, can be used to predict directly the potential resistance of concrete to carbonation. The water/cement ratio and degree of moist curing are the main factors influencing the quality of concrete in terms of its carbonation resistance.

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

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

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

Synopsis 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.