Title:
In-Place Resistivity of Bridge Deck Concrete Mixtures
Author(s):
James W. Bryant Jr., Richard E. Weyers, and Jesus M. de la Garza
Publication:
Materials Journal
Volume:
106
Issue:
2
Appears on pages(s):
114-122
Keywords:
low-permeability concrete; permeability; resistivity.
DOI:
10.14359/56455
Date:
3/1/2009
Abstract:
This study investigated the in-place permeation properties of six low-permeability concrete bridge deck mixtures used in the Commonwealth of Virginia. Laboratory specimens were tested at 7, 28, and 91 days. Statistical analyses were performed to assess the significance of the relationships for electrical charge passed in coulombs and initial measured electrical current in amps, slab and cylinder electrical resistivity, and slab electrical resistivity and charge passed. A well-defined relationship was observed between electrical charge passed and initial current, resistivity of the concrete slabs and cylinders, and the charge passed and the slab resistivity. Prediction bands, at the 5% significance level, were constructed to give an estimate of an expected charged-passed value for a new observation of in-place resistivity. Field data were used to validate laboratory-established models for charge passed and electrical resistivity. Laboratory-established models were able to predict 30 to 50% of the field data.