Field trials on covercrete monitoring sensors Available to Purchase

This paper details the application of in situ electrical measurements to study cover-zone performance and presents the initial results from a long-term field exposure study. Field data are presented from a marine test site, an urban exposure site and a roadside test site. A range of formalisms are exploited to allow ease in data interpretation and a simple electrical model is used to show the interrelationship between electrical properties of concrete, pore structure, degree of pore saturation and ionic ingress. Measurements, to date, indicate that the sensor arrangement embedded within each of the test specimens is behaving as anticipated from previous laboratory studies. Water absorption, ongoing hydration and pozzolanic activity are detected within the cover zone and, in the case of the marine site, ionic ingress is detected in one of the sets of test specimens.