MasterRheobuild 857 A high range water reducing superplasticiser for rheoplastic concretes
Formerly: Rheobuild 857
How does MasterRheobuild 857 work?
MasterRheobuild 857 is a high range water reducing superplasticiser. It is based on negatively charged molecules of synthetic polymers which when dispersed within the fresh concrete absorb onto the surface of the cement grains. After the molecules are absorbed they create an electrostatic repulsion amongst the cement grains, making their dispersion in water easier and consequently the concrete mix is more flowable.
MasterRheobuild 857 is formulated to produce rheoplastic concrete. Rheoplastic concrete flows easily, maintaining high plasticity for time periods longer than conventional superplasticised concrete. Rheoplastic concrete has a similar water-cement ratio to zero slump concrete, and enhances the hardened properties of the concrete. The slump-retention characteristics of concrete made with MasterRheobuild 857 permit the admixture to be dosed at the batching plant.
MasterRheobuild 857 meets the requirements of:
- ASTM C-494 Type A, B, D, F and G
- EN 934-2 Tables 2 and 10
What is MasterRheobuild 857 used for?
MasterRheobuild 857 is designed for use in the manufacture of high quality structural concrete, mass concrete pours; pre-cast concrete; pre-stressed and post tensioned concrete; sprayed concrete; high early strength, high workability concrete; underwater concrete.
The MasterRheobuild 857 formulation has been tailored for use in concrete mixes including ground granulated blastfurnace slag (GGBS) and microsilca.
MasterRheobuild 857 is used to increase and extend workability, increase compressive strength and effect cement economies. The wide dosage range of MasterRheobuild 857 enables water reductions to produce a dense concrete with reduced permeability and reduced water penetration.
MasterRheobuild 857 is also used in areas of congested reinforcement where high workability is of benefit; wherever reduced water contents would be of benefit and in hot weather to extend workability.
What are the benefits of MasterRheobuild 857?
MasterRheobuild 857 has been formulated specifically for use in the Middle East climate and it offers the following advantages:
- Less dependence on compaction energy
- Job time and cost reduced through higher productivity rates and/or reduced labour
- Early strength allows for accelerated construction methods, resulting in completion dates ahead of schedule