Abstract
This article discusses the current industry practice for acceptance testing of post-tensioning grouts. The practice includes an accelerated corrosion test (ACT), as recommended in Post-Tensioning Institute (PTI) M55.1-03, “Specification for Grouting of Post-Tensioned Structures.” The current ACT method typically takes 1 to 2 months to complete and is seen as a downside. However, the linear polarization resistance (LPR) technique requires only a few hours to complete. The research presented in this paper indicates a strong correlation between the time to corrosion, as measured by the ACT method, and the system polarization resistance, as measured by the LPR technique. The authors recommend the use of the LPR method as a prescreen for very high-quality grouts so that lengthy ACT testing is not necessary.
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