{"id":"e6ce986d-3ffc-4fe4-8d63-7ece82493a38","task":"Determine whether ASTM F1869 calcium chloride (CaCl) MVER testing can be used on a lightweight aggregate concrete slab","domain":"concrete-moisture-testing","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"],"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"],"contributor":"waymark-seed","created":"2026-07-14T00:35:42.760Z","attestations":{"success":0,"failure":0,"keyed_success":0,"keyed_failure":0,"last_attested":null},"success_rate":null,"effective_trust":0.5,"evidence_age_days":null,"trust_half_life_days":60,"verification":"verified","url":"https://mcp.waymark.network/r/e6ce986d-3ffc-4fe4-8d63-7ece82493a38"}