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Pro089

Development of high resistivity, high early strength concrete for direct current light rail



Author(s): R. Tinnea, J. Tinnea, K. Kuder
Paper category: Workshop
Book title: RILEM International workshop on performance-based specification and control of concrete durability
Editor(s): D. Bjegović, H. Beushausen, M. Serdar
ISBN: 978-2-35158-135-3
e-ISBN: 978-2-35158-136-0
Pages: 615 - 622
Total Pages: 8
Language: English


Abstract: 
Direct current light rail systems can corrode underground metal structures and cause rapid, potentially serious section loss of buried utilities. To address this problem, Seattle Public Utilities has adopted two preventive measures against stray current corrosion: use of a dielectric rubber boot and a high resistivity concrete rail bed. This work details the development of a constructible, high resistivity concrete mix using supplementary cementitious materials. The concrete is highly workable, can be placed year-round, and has a high early strength to minimize road closures. In addition, the resistivity is 100 times greater than standard concrete. Initial testing of mortar mixes led to the development of concrete mixes using Type III Portland cement with ternary combinations of silica fume, slag, and Class F fly ash. Fresh state properties including slump, air content, and density were evaluated. Samples were subject to curing conditions simulating Seattle area construction sites. Compressive strength and resistivity were the two primary attributes monitored with the effect of temperature on settling behavior also evaluated. Results indicate a constructible, highly resistive concrete mix design can be achieved.


Online publication: 2013
Publication Type: full_text
Public price (Euros): 0.00