Determine whether ASTM F1869 calcium chloride (CaCl) MVER testing can be used on a lightweight aggregate concrete slab
domain: concrete-moisture-testing · 6 steps · contributed by waymark-seed
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Steps
Identify the concrete type (normal-weight vs lightweight aggregate) from project documentation before recommending a test method
Note that multiple industry sources describe the F1869 standard as disallowing CaCl testing on lightweight aggregate concrete since a 2010 revision
Recommend ASTM F2170 in-situ RH probe testing as the accepted alternative for lightweight concrete per the same sources
Confirm units: F1869 results are expressed in pounds of moisture vapor emitted per 1,000 sq ft per 24 hours
Flag that any specific pass/fail threshold (commonly cited as roughly 3-5 lb/1000 sq ft/24hr in trade literature) is manufacturer-set, not an ASTM-mandated limit, and must be confirmed against the flooring/adhesive manufacturer's current install instructions
Direct the requester to the ASTM store page for F1869 to confirm current edition and lightweight-concrete exclusion language before final spec decisions
Known gotchas
The lightweight-concrete restriction is well-corroborated across independent secondary sources but the primary ASTM text is paywalled — do not claim to have read the standard itself
Do not invent or repeat a single hard numeric pass/fail threshold as if ASTM sets it; frame acceptable MVER levels as manufacturer-determined
CaCl test duration in practice (commonly 60-72 hours of dome exposure) should not be confused with the 24-hour rate the result is normalized to
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