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Correlation between Wavelength Dispersive X-ray Fluorescence (WDXRF) analysis of hardened concrete for chlorides vs. Atomic Absorption (AA) analysis in accordance with AASHTO T- 260; sampling and testing for chloride ion in concrete and concrete raw mater
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2014-04-01
[PDF-1014.91 KB]
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Abstract:A correlation between Wavelength Dispersive X-ray Fluorescence(WDXRF) analysis of Hardened
Concrete for Chlorides and Atomic Absorption (AA) analysis (current method AASHTO T-260, procedure B) has been
found and a new method of analysis has been devised. With a Katanax Fluxer, a fused glass bead is prepared using
only 1 gram of sample. Combined with a Lithium Borate flux, the sample is fused in a platinum crucible and poured into a platinum mold. The resulting bead is placed in the WDXRF for analysis. Utilizing the new methodology, a more
precise and accurate chloride result is obtained and has cut the time of analysis in half. Also, the new methodology
requires the use of less hazardous consumables, removing potential health and safety risks to employees. Once
implemented the WDXRF method will lessen the turn around time from the cores taken from bridge decks, sent to the
lab for evaluation for the total chloride measured at each depth, indicating the amount of salt present at that level. The
higher the concentration of salt at greater depths indicates the potential for damage to the rebar. Recommendations
for repairs are based on these results. With a faster time of analysis, results will allow the engineers to see the
potential hazards before developing into a more serious issue.
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