Identification of techniques to meet pH standard during in-stream construction : research summary.
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2014-03-01
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Abstract:Many of Maryland’s tributaries traverse highway infrastructure via culverts that are managed
and maintained by SHA. These culverts are often made of galvanized steel and over time are
subjected to scour. Concrete grout is often used as a repair material when these issues are
identified. However, once water is allowed to inundate the freshly paved culvert, the grout
surface can produce a dissolution effect in which elevated pH can impact downstream waters.
The occurrence of this pH spike from grout has been reported in past projects, and has
resulted in concerns as the pH of water may reach above the regulatory limit of 8.5.
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