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Direct Analysis in Real Time Mass Spectrometry (DART-MS) is an ambient atmosphere mass spectrometry technique. Two concrete topical treatments were studied. One is a penetrating silane sealer. The other is a pure migrating inhibitor topical product.
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The performance and relative importance of a recent testing program for corrosion inhibition and other performance parameters using documented test methods.
Two benchmark experiments were performed by NASA and CERL. The first was performed in 1998 at the NASA KSC Corrosion Technology Laboratory and the second in 2007 in Okinawa, Japan under the leadership of CERL.
Slow strain rate tests were conducted to study the SCC behavior of plain and welded UNS K02700 grade mild steel exposed to an artificial concrete pore water solution. Tests were performed under anoxic conditions at 140°C, a constant strain rate of 5 × 10-7 s-1 and open circuit potential.
Assessment of degradation mechanisms based on reviews of literature and operating experience from nuclear and nonnuclear applications, considering the long-term effects of these mechanisms on the integrity of Dry Storage Systems.
The authors have developed the monitoring method “CIPE” which determines corrosion rate using Tafel slope extrapolation method. To confirm accuracy, the results of CIPE are compared with mass losses of steel bars corroded in concrete.
Results of laboratory tests of dual-coated (zinc/epoxy) rebars embedded in concrete and in a concrete simulated pore solution with and without chloride contamination followed by a brief description of the adopted methodologies.
Wastewater collection and treatment systems face a more serious corrosion problem today than in the past. There are several reasons for this, including odor control, reduced I&I, chemical composition of sewage, an increase in the retention time, and concrete that is not of the same quality as it was only 30 years ago.
Now more than ever, epoxy coatings on concrete will only prove successful if diligent care is given to the details of concrete preparation. Preparation is more than grinding or facing of an existing surface and should ideally begin in the developmental stages of the structure.
Model building codes and standards have begun adopting new energy efficiency requirements for building envelopes, including more quantifiable assessment of the air permeance characteristics of the materials and assemblies used in the building envelope. This research effort was initiated to understand and quantify the air leakage mechanisms of single wythe concrete masonry construction, which is commonly used in exterior building envelopes.
This standard includes procedures for using pressurized water to remove loosely adhered surface contaminants. It contains requirements for the cleaning process, for the end condition of a lightly cleaned concrete surface, and for verification of the end condition. The standard does not address removal of water-insoluble contamination; assessment of concrete soundness and pH; repair of the substrate and exposed reinforcing steel; or required surface profile.
Often when a polymer coating failure occurs, the concrete quality and integrity are questioned. Core samples removed from the concrete slab are examined using petrographic techniques to help determine the cause of the coating failure. The basics of the petrographic examination, the equipment used and what information it can provide are presented.