What it is
Matched compacted specimens receive different conditioning, after which their strength results are compared.
Public test guide
Immersion Index
Compares asphalt strength before and after controlled water conditioning.
Plain-language explanation
What the test tells you.
The project specification controls the exact method and acceptance requirement.
What is used
Compacted asphalt specimens, controlled water bath and the specified strength-testing apparatus.
What it determines
Retained strength or index after immersion relative to the reference condition.
Why it matters
Indicates moisture sensitivity and the ability of the asphalt-binder system to retain strength when wet.
Typical test sequence
From sample
to result.
- 01
Prepare matched specimens
- 02
Condition the reference and immersed sets
- 03
Test both sets and calculate retained strength
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