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... 1 Introduction Scope This guideline has been developed to help highway agencies and their representatives understand the issues associated with detection and remediation of soluble salt contamination prior to coating steel highway structures. It is designed to consolidate practical guidance based on the work performed under NCHRP Project 10-97, "Detection and Remediation of Soluble Salt Contamination Prior to Coating Steel Highway Structures." More extensive discussion of the technical issues in this guideline are presented in the contractor's technical report, available for download on the TRB website (trb.org)
From page 2...
... 2 and reported as "total salt." The conversion does not represent any particular salt: it is simply a mathematical construct that has proven to be a pragmatically useful way to report conductivity data. To determine the specific ions in the solution, individual ion-specific tests are used.

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