Winter building
Admixtures, admissibility and cold-weather work limits
By topic
Concreting below zero
Allowed with antifreeze admixtures (to −15°C per label) or heating (enclosure, thermal mats, electric heating). Without them — prohibited below +5°C.
Antifreeze admixtures
Chloride (cheap, but not for reinforced — corrosion) and chloride-free. Dose 2–5% cement mass. Admixtured concrete still needs covering for the first day.
Winter masonry
Down to −5°C possible with mortar admixtures and warmed materials; blocks can't be laid frozen/icy. Mix mortar warm, use within 1–2h.
What not to do in winter
Plastering and facade works without enclosure, torch-applied waterproofing in deep frost, pouring foundation on frozen ground, laying pavers.
Concrete curing
Critical first 3 days: concrete must reach ≥30–50% strength before freezing. Enclosure/insulated formwork, temperature monitoring inside the pour.
Cost reckoning
Winter surcharges: admixtures ~5–10% of concrete cost, enclosure+heating — rental+fuel, slower pace. Often cheaper to postpone concreting to spring.
The main rule of winter building: water in the mix must not freeze before strength gain. Everything else — admixtures, enclosures, heating — is just a way to achieve that. Dubious 'winter' concrete shows itself in spring cracks.
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