Sustainable concrete production, which means a net reduction in CO2 emissions over the life-cycle of a structure, can be achieved by; a reduction of cement used, a reduction of mixing and/or placement energy, and an increase in longevity/durability of the concrete structure.
Sika® Rapid-1 can offset cement demand without sacrificing early age or final concrete strengths. This reduction in cement demand directly reduces the embodied carbon (eCO2) within the concrete mix resulting in lower direct contributions to greenhouse gas emissions and global warming potential. This benefit is improved when combined with supplemental cementitious materials (SCMs) such as fly ash, slag, silica fume, or metakaolin. Sika® Rapid-1 can help in the reduction of the embodied carbon of concrete. A harder accelerator admixture is used to both increase workability and reduce the water/cement ratio. This leads to increased strength and reduces the permeability of hardened concrete while decreasing cement concrete.
Sika® Rapid-1 technology is a unique, non-chloride-based hardening and strength accelerator that increases the early age strength of concrete. Unlike conventional set accelerators, Sika® Rapid-1 technology does not reduce slump life and has a minimal effect on concrete's initial set time and final strength. This allows the concrete to be produced, transported, placed, and finished normally. Once the concrete reached its initial set, Sika® Rapid-1 can be used to reduce demoulding time or speed access onto concrete floors and pavements and speed up the construction process.
Sika® Rapid-1 enhances concrete durability by providing a stronger concrete matrix at an early age when concrete is most susceptible to internal and external stresses. These stresses can lead to localized cracks and the eventual onset of more several concrete corrosion.