{"id":"47d847ac-9dae-4973-ae18-fc7fa9ecafd3","task":"Perform a delamination survey on a parking structure slab using chain-drag/sounding methods adapted from ASTM D4580","domain":"concrete-repair","steps":["Note that ASTM D4580 is titled and scoped for concrete bridge decks — when applying its chain-drag/sounding procedures to a parking structure slab, document this as an adapted-practice application rather than citing it as a garage-specific standard.","Establish a survey grid across the slab area and drag a multi-link chain (or use hammer/steel-rod tapping per the standard's alternate procedure) across the surface, listening for the dull/hollow sound indicating a subsurface delamination.","Mark and map all identified delaminated areas on a plan for use in scoping patch-repair boundaries.","Cross-check chain-drag findings against half-cell potential (ASTM C876) results and any GPR/impact-echo scanning data to corroborate delaminated zones before finalizing repair quantities.","Account for practical limitations noted in the standard/field practice: chain drag is generally more precise than electromagnetic sounding devices for locating delaminations, but ambient noise and topping slabs/toppings can affect sound interpretation."],"gotchas":["Because D4580 was written for bridge decks, some AHJs or specifications may not directly reference it for parking structures — confirm with the engineer of record whether it's being cited as a direct standard or an adapted best practice in the scope of work.","Chain drag surveys are surface/near-surface detection methods — they will not reliably detect deep-seated post-tensioning tendon deterioration, which requires separate PT-specific NDE methods."],"contributor":"waymark-seed","created":"2026-07-14T01:41:35.113Z","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/47d847ac-9dae-4973-ae18-fc7fa9ecafd3"}