Minimal Drilling Technique to Measure Chloride-Penetration Depth and Carbonation Depth in Concrete
Publication: Journal of Materials in Civil Engineering
Volume 32, Issue 9
Abstract
A method was investigated to determine concrete durability by measuring the carbonation depth and chloride ion () penetration depth. Under the proposed method, a 1- or 2-mm-diameter hole was drilled into a concrete surface and the hole’s walls were sprayed with either a phenolphthalein or silver nitrate solution to observe the carbonation depth or penetration depths using an inserted 0.6-mm-diameter fiberscope. This method is intended to be a highly accurate, semidestructive test of concrete durability that causes minimum damage to the inspected concrete structure. It was found through visual observation and image analysis that when coloring the 1-mm drill holes with phenolphthalein, the holes had to be sufficiently dried before observation, whereas when coloring with silver nitrate, no special pretreatment was required. The results of the proposed method were compared with measurements using calipers on cut surfaces, demonstrating that the proposed method yields highly reliable measurements of parameters describing concrete durability.
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Data Availability Statement
Some or all data, models, or code that support the findings of this study are available from the corresponding author upon reasonable request.
Acknowledgments
This study was financially supported by the Sumitomo Electric Group. The authors would like to thank Dr. K. Nakarai (Hiroshima University) for assistance with the onsite experiments of the middle-scale specimens.
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Published In
Journal of Materials in Civil Engineering
Volume 32 • Issue 9 • September 2020
Copyright
©2020 American Society of Civil Engineers.
History
Received: Oct 30, 2019
Accepted: Feb 6, 2020
Published online: Jun 18, 2020
Published in print: Sep 1, 2020
Discussion open until: Nov 18, 2020
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