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Federal Highway Administration Research and Technology
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This report is an archived publication and may contain dated technical, contact, and link information
Publication Number: FHWA-RD-01-164
Date: March 2002

Figure C-3

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Figure C-3: Flowchart. Flowchart for identifying infilling materials in cracks and voids. To identify the infilling materials in cracks and voids, answer the following questions and follow the indicated steps using the results of staining techniques using a petrographic microscope and/or SEM analysis.

1.) Are sulfates present?

2.) Is chloro-aluminates or are calcium hydroxide present?

3.) Is calcite or are magnesium silicate hydrates present?

4.) Are alkali-silica reaction products present?

5.) Is iron oxide present?

6.) Are other substances present?

For information about corrosion of embedded steel, see table C-1. For sulfate attacks, see table C-4, deicer attack C-5, alkali-silica reactions C-6, and alkali-carbonate reactions C-7.


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