Sika®ViscoCrete®-325 C is a high-performance superplasticizer and water reducer in powder form based on Sika®ViscoCrete® polycarboxylate polymer technology.
USES
Sika®ViscoCrete®-325 C is formulated for applications in systems with high calcium sulfate content or pure gypsum binders. The product is especially suitable for the production of dry-mixed mortars and concrete for applications like:
▪ Floor screeds, self-leveling screeds and underlayments
▪ Grouts, non-shrink grouts, repair mortars, tile adhesives
▪ Building plaster, render, stucco, bonding/filling compound, molding plaster, dental & medical plaster
Sika®ViscoCrete®-325 C can be used in the following binder systems:
▪ Calcium sulfate binders (α- and β-hemihydrate, natural/thermal/syntheticanhydrite)
▪ Ternary compounds (Portland cement + calcium aluminate cement +calcium sulfate)
▪ Portland cement and cement blends
CHARACTERISTICS / ADVANTAGES
Sika® ViscoCrete®, Sika’s polycarboxylate technology, works based on a combination of electrostatic forces and steric repulsion effects. Thus, solid particles can be effectively dispersed.
The benefits of Sika® ViscoCrete®-325 C include, but are not limited to the following:
▪ High water reduction (resulting in high density and strength)
▪ Excellent flowability (resulting in highly reduced placing- and compacting efforts)
▪ Increased early strength development
▪ Improved shrinkage and creep behavior
▪ Reduced mixing times due to rapid adsorption
▪ Long-term stability enables long slump life
▪ Low influence on hydration, thus low activator/accelerator consumption
▪ Efficiency over a wide pH-range
▪ Compatible with other additives, e.g. citric acid
▪ Free of formaldehyde (unlike SNF/SMF) and ammonia
CONSUMPTION / DOSAGE
Dosage rate varies depending on the application and due to variations in drymix composition. A typical dosage range is 0.05 - 0.5 % by weight of binder. At high dosage bleeding and/or segregation may occur as well as retardation of setting.
DISPENSING
Sika®ViscoCrete®-325 C is added to the dry mix. For optimal utilization we recommend a minimal wet mixing time of 30 seconds for mortar.
COMPATIBILITY
Sika®ViscoCrete®-325 C may be combined with many other Sika products as well as with most existing activators/accelerators, retarders, redispersible powders, stabilizers and other additives used in dry-mix applications. In combination i.e. with other Sika ViscoCrete Powders and Retardan improvements in flowability
and setting-time adjustment may be achieved.
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