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Title	DEVELOPMENTS IN NEAR-SURFACE TESTING OF COVERCRETE
Accession No	00793944
Authors	McCarter, W J; Chrisp, T M; Starrs, G; Basheer, PAM
Conference Title	Fifth CANMET/ACI International Conference on Durability of Concrete
Corp. Authors / Publisher	American Concrete Institute
Editors	Malhotra, V M
Publication Date	20000000
Description	p. 283-299; Figures(8); References(14); Tables(2)
Languages	English
Abstract	The work presented details a testing methodology whereby a range of properties of cover-zone concrete can be determined, these properties being ultimately linked to the long-term performance of concrete. Emphasis is place on the application of a surface-applied, water absorption method in conjunction with electrical measurements taken within the cover zone. In the current work, the influence of cyclic wetting and drying of normal portland cement concretes, with and without blast-furnace slag replacement, were studied. Samples were subjected to both water and chloride solution. The study shows that the depth and rate of water penetration during absorption can be evaluated; when these data are combined with volumetric gain, the effective porosity of concrete in the cover region can be estimated. Conductivity profiles taken over cycles of wetting and drying can be used to provide information on the zone of influence of drying action (convective zone), on-going hydration effects, and ionic ingress.
TRT Terms	Absorption ; Chlorides ; Concrete ; Conduction ; Cyclic tests ; Electrical measurement ; Hydration ; Ions ; Porosity ; Portland cement ; Properties of materials ; Slag ; Testing ; Water ; Wetting and drying tests
Other Terms	Cover zone (Concrete); Near-surface testing (Concrete)
Subject Areas	H32 CEMENT AND CONCRETE; I32 Concrete
Report Number	SP 192-18
Availability	American Concrete Institute
TRIS Files	HRIS
Database	TRIS Online

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