Identification of techniques to meet pH standard during in-stream construction.
-
2014-03-01
Details:
-
Creators:
-
Corporate Creators:
-
Corporate Contributors:
-
Subject/TRT Terms:
-
Publication/ Report Number:
-
Resource Type:
-
Geographical Coverage:
-
Corporate Publisher:
-
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. The goal of this
project was to ensure that SHA has a proper specification and remedial actions for addressing
the pH concern. The overall objectives of this research were to (1) review the current
specification for using grout for culvert maintenance, (2) determine the various parameters that
control pH spikes for effluent waters, (3) determine applicable remedial applications, and (4)
revise the current specification and provide a guidance document/tool for SHA and contractors.
Laboratory and field studies were used to investigate and test these objectives.
-
Format:
-
Funding:
-
Collection(s):
-
Main Document Checksum:
-
File Type:
Supporting Files
-
No Additional Files
More +