Admixtures play a crucial role in the production of semi-dry precast concrete by improving its compaction, workability, durability, efflorescence and performance. Semi-dry precast concrete, falls between dry-cast and wet-cast concrete in terms of consistency and the mixes benefit from the use of various admixtures to tailor its properties. The MasterCast family of admixtures offers a wide range of concrete-enhancing products specifically formulated for the production of Semi-Dry Precast elements such as AAC, bricks, blocks, paving & roof tiles.

Compaction Solutions

Semi-Dry Precast products require careful compaction to ensure proper consolidation and the removal of air voids. Effective compaction is crucial for achieving the desired strength, durability, and appearance of precast concrete elements. Semi-dry cast concrete requires a balance between workability and compaction to achieve the desired results. Careful consideration of the mix design, formwork, and compaction methods is essential to produce high-quality precast elements.

MasterCast 281​ - Compaction aid for concrete brick production.

MasterCast 311 - Water reducing admixture engineered for Aerated Autoclaved Concrete (AAC).

​MasterCast 701 - High range water reducing compaction aid designed with enhanced strength development, particularly secondary cementitious materials.

MasterCast 735​ - Water reducing admixture engineered for concrete roof tile production.

MasterCast 777 - Mid range water reducing admixture specially designed for use in Semi Dry Cast production process, which aids compaction.

MasterCast 864 - Water inducer and finishing aid for use in Semi Dry Cast production process.

Water Resistance / Efflorescence Solutions

Efflorescence is a common issue in concrete, it appears as a white, chalky, or powdery deposit on the surface of the concrete and is caused by the migration of soluble salts to the surface. MasterPel is a specially blended admixture used to produce water-resistant and efflorescence-controlled concrete mortar. Concrete treated with MasterPel provides outstanding resistance to water migration, excellent efflorescence control, enhanced mix flowability and optimised pigment dispersion. It also reduces the need for post-applied sealers.

MasterPel 793 - Integral Water resisting admixture which reduces efflorescence for Precast concrete.