Influence of Moisture Condition of Concrete on the Performance of Surface Treatments

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Title: Influence of Moisture Condition of Concrete on the Performance of Surface Treatments

Author(s): P. A. M. Basheer, A. McCauley and A. E. Long

Publication: Special Publication

Volume: 170

Issue:

Appears on pages(s): 1049-1072

Keywords: Absorption; carbonation; chlorides; formwork; moisture; permeability

Date: 7/1/1997

Abstract:
This paper reports results of an investigation in which the effect of moisture condition of concrete at the time of application of silane on permeation and durability characteristics of concrete was determined. T h e permeation properties (i.e. air permeability and sorptivity) were measured with the Autoclam permeability system, an apparatus developed at Queen’s University of Belfast. The durability characteristics were determined in terms of chloride penetration and carbonation. Also, a comparison of the performance of silane was made with that of a controlled permeability formwork system. The results indicated that the moisture condition of concrete at the time of application of silane does not affect its protective properties to any significant degree. Silane’s performance was comparable with, or better than, that of the controlled permeability formwork in terms of sorptivity and chloride penetration at three moisture conditions included in the investigation. However, silane was found to have relatively little benefit in terms of carbonation resistance in accelerated tests, surface tensile strength and air permeability of the near surface concrete. The use of controlled permeability formwork resulted in improvements in these properties as well.