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Steam supply solutions that provide temperature and humidity according to the project curing cycle for precast concrete elements, either in a chamber or under a cover.
In precast production, curing conditions are determined together with the concrete mix, element geometry, formwork, initial temperature and target strength plan. Steam can help provide temperature and humidity within a suitable cycle; however, rapid or irregular heating, large temperature differences and uncontrolled cooling can create quality risks.
Low-pressure steam is supplied to the curing chamber or under a suitable cover through a distribution line. Nozzle placement, sealing, air circulation and condensate management are planned to support exposure of the elements to similar conditions. Temperature records are monitored at different points, and the cycle is managed according to the programme defined by the concrete specialist.
The mass of the concrete and formwork in a cycle, element dimensions, initial and target temperatures, permitted heating time, chamber or cover volume, insulation, ambient conditions, formwork stripping schedule and number of consecutive production cycles should be provided. Reliable selection cannot be made based only on chamber volume in cubic metres.
Stilsan pre-sizes the steam source and distribution requirements according to the project cycle; responsibilities for the chamber, cover, sensors, recording and control are clarified in the quotation. The concrete mix design, curing programme and strength acceptance must be determined by the customer’s engineering team or an authorised concrete specialist. A specific strength or formwork stripping time cannot be guaranteed by the generator alone.
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