Precast concrete production relies on a controlled, industrialised process where consistency, efficiency and concrete performance are essential. Whether manufacturing large structural elements or smaller modular products, Sika admixture technologies support reliable production, high-quality finishes and efficient installation on site.
Wet Precast Concrete
Wet precast concrete is used to manufacture structural elements that are produced in a controlled factory environment and delivered to site after hardening. This process requires a well-optimised mix design and solutions that support every step, from reinforcement preparation to final installation.
In wet precast production, key considerations include tight and properly treated formwork, cost-efficient concrete mix designs, sufficient slump life for easy transport and placement, and fast finishing without delays. Rapid early strength is essential for short formwork cycles, while suitable curing and surface treatments ensure long-term durability and an attractive finish. Additional requirements include efficient repair of surface defects, protective treatments before transport, and durable joint sealing and grouting during installation on site.
Sika provides a full range of admixtures to meet the technical demands of wet precast manufacturing and ensure consistent, high-performance concrete elements.
Semi-Dry Precast Concrete
Semi-dry concrete is widely used for the production of paving stones, blocks, kerbstones, slabs, garden elements, pipes, manholes and roof tiles. These products are manufactured in large quantities and rely on consistent compaction, accurate mould filling and high-quality surface appearance.
Critical factors for semi-dry concrete include precise water content, which determines compaction and cement paste lubrication, as well as uniform mould filling to maintain consistent product weight and quality. Freshly compacted products rely on sufficient green strength to demould immediately while retaining shape. Final compressive and splitting strengths are closely linked to concrete density and optimal water content. Freeze–thaw resistance is another key performance requirement, particularly for exposed paving products, and is influenced by aggregate quality, low pore content and proper hydration after curing.
SikaPaver® technologies enhance compaction, reduce variations, improve green strength and deliver highly durable, visually consistent semi-dry precast products.
Advantages of Precast Concrete with Sika Admixtures
- Adequate workabaility, rapid installation and fast strength development
- Cost efficient concrete mix designs
- High strength and durable finished products
- Reduced or eliminated heat or steam curing
- More sustainable and environmentally responsible production
- Fast, efficient and high-output manufacturing
- Greater flexibility for quick formwork changes and varied product types
