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Experimental demonstration of Xypex additive in concrete to improve durability.
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    In 2012 the Maine Department of Transportation reconstructed the Stockton Springs Underpass Bridge #5760 on Church Street over US Route 1. The primary Contractor for this project was the Lane Construction Corporation of Cheshire, Connecticut. The bridge consists of structural steel girders with a reinforced concrete deck system. Because of the steep profile grade an integral concrete wearing surface was used instead of the typical waterproofing membrane with hot mix asphalt pavement surface. MaineDOT generally uses black bar as reinforcing steel in bridge decks. An opportunity arose on this project to supplement the concrete mix with a waterproofing additive in hope of providing a more durable and impermeable concrete deck. On this project, the MaineDOT used an alkaline earth silicate cement admixture as an experimental feature to waterproof the concrete. Unlike many other concrete waterproofing solutions, XYPEX ADMIX C-500 is added to the concrete mix at the time of batching, so it becomes integral to the finished product and permanent. The active chemicals in XYPEX react with the moisture in fresh concrete and the by-products of cement hydration to generate a non-soluble crystalline formation throughout the pores and capillary tracts of the concrete, thereby reducing the concrete permeability which in turn increases durability. This report covers the experimental usage of the Xypex additive, including lab test results and analysis and field observations during construction and subsequent inspections.
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