51316-7544-Characterization of Concrete and Corrosion of Steel Fibers Embedded in Dry-Cast Concrete Pipe

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Product Number: 51316-7544-SG

ISBN: 7544 2016 CP

Author: Francisco Presuel-Moreno

Publication Date: 2016

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Despite the low water cementitious ratio used when preparing dry-cast reinforced concrete pipes the concrete porosity of dry-cast reinforcing concrete pipes has been found to range between 9 to 11 percent. These a higher porosity values than the porosity that is usually found on wet-cast concrete with low water cementitious ratio. This high porosity might affect how chlorides are transported into dry-cast concrete. Recently the used of steel fibers has been suggested to reinforce dry-cast concrete pipe replacing the traditional steel cage reinforcement. The corrosion resistance of steel fibers in this type of concrete is not known nor the concrete durability to chlorides (marine) exposure. Steel fiber reinforced concrete pipes were prepared at factory and segments provided for this study. The goals of this investigation are: 1) Characterize the transport characteristic of this concrete and to 2) asses if the steel fibers are prone to corrosion what is the chloride concentration that triggers corrosion and to what depth is corrosion observed. Rapid migration test modified rapid migration test (e.g. longer exposure) resistivity porosity and sorptivity will be used to characterize the concrete. Wet-cast concrete specimens with instrumented fibers will be used to characterize the corrosion potential as the chloride build-up around the fibers (via accelerated chloride transport). Selected specimens will be terminated for forensic examination.