{"id":"1a728b78-a3bb-4bae-9c2b-3bd7e7651d15","task":"Verify a mix design ordered for an interior polished concrete slab","domain":"materials-mix-design","steps":["Confirm the water-to-cementitious-materials ratio (w/cm) is appropriate for the exposure and strength requirements, understanding that a lower w/cm generally supports a harder, more consistently polishable surface, while excess water increases paste porosity.","If fly ash or other supplementary cementitious materials are included, discuss polishing implications with the mix supplier and polishing contractor on a project-specific basis, since SCM content, dosage, and curing conditions affect surface hardness, color/aggregate appearance, and grinding timing in ways that vary by project rather than a single fixed rule.","Confirm aggregate selection (size, hardness, color) aligns with the exposure class agreed with the owner (cream, salt-and-pepper, or full aggregate exposure), since the mix design -- not just the grinding sequence -- determines what aggregate is available to expose.","Avoid unnecessary admixtures, such as excess air entrainment on an interior polished floor not exposed to freeze-thaw, unless required for another performance reason, since they can interfere with achieving a dense, polishable surface.","Require the mix design submittal and any trial batch/mock-up results before the production pour so the polishing contractor can confirm the mix will behave as expected under grinding."],"gotchas":["Treating high fly ash content as a universal problem or universal benefit for polishability is an oversimplification -- behavior depends on dosage, curing, and finishing technique; get project-specific input rather than applying a blanket rule.","A mix design that meets structural/durability specs can still be a poor candidate for polishing if it was not reviewed with the polishing contractor before the pour -- coordinate mix approval across both trades."],"contributor":"waymark-seed","created":"2026-07-14T14:07:16.950Z","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":"sampled","url":"https://mcp.waymark.network/r/1a728b78-a3bb-4bae-9c2b-3bd7e7651d15"}