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Sika® ViscoCrete®-20 HE HIGH
RANGE WATER REDUCER / SUPERPLASTICISER DESCRIPTION
Sika® ViscoCrete®-20 HE is a liquid admixture for concrete and mortar which is used as high range water reducer or superplasticiser. Sika® ViscoCrete®-20 HE is designed to work on a combination of electrostatic adsorption and steric repulsion effects allowing solid particles to be effectively dispersed. Therefore a high level of fluidity and plasticising can be reached with a high water reduction which provides many advantages. USES Production of concrete mixes which require high early strength development, powerful water reduction and improved flowability. ▪ Precast concrete ▪ Fast-track concrete ▪ In situ concrete requiring fast stripping time ▪ Self Compacting Concrete (SCC)
CHARACTERISTICS / ADVANTAGES ▪
High water reduction ▪ High final density and strength properties ▪ Reduced shrinkage, creep, water permeability, etc Improved flowability, placing and compacting behaviour ▪ ▪ Improved surface finish ▪ Increased early strength development ▪ Early removal of formwork ▪ Reduced curing ▪ Does not contain chlorides Suitable for use in reinforced and pre-stressed concrete ▪
APPROVALS / STANDARDS CE
Marking and Declaration of Performance to EN 934–2 – Admixtures for concrete, mortar and grout. IS 9103, ASTM C494 PRODUCT INFORMATION Chemical Base Aqueous solution of modified polycarboxylates Packaging 255 Kg Drum Bulk supply Refer to current price list for packaging variations Appearance / Colour Light brown to slightly cloudy liquid Shelf Life 12 months from date of production Storage Conditions The product must be stored in original, unopened and undamaged sealed packaging in dry conditions at temperatures between +10 °C and +40 °C. Always refer to packaging. Density ~1,09 kg/l at +20 °C
TECHNICAL INFORMATION
Concreting Guidance The standard rules of good concreting practice, concerning production and placing are to be followed. Laboratory trials must be carried out before concreting on site, especially when using a new mix design or producing new concrete components. APPLICATION INFORMATION Recommended Dosage ▪ For medium workability: 0,2–0,8 % by weight of cement For concrete of high workability, very low water/cement ratio and for self compacting concrete: 1,0–2,0 % by weight of cement ▪ Compatibility Sika® ViscoCrete®-20 HE may be combined with many other Sika products. Trials must always be carried out before combining products in specific mixes. Contact Sika Technical Services for additional information and any specific combinations. Restrictions Sika® ViscoCrete®-20 HE must not be added to dry cement.
APPLICATION INSTRUCTIONS DISPENSING
Sika® ViscoCrete®-20 HE is added to the gauging water or added with it into the concrete mixer. To achieve the optimum performance, a wet mixing time of at least 60 seconds is recommended. To avoid excess water in the concrete, the final dosage must begin after 2/3 of the wet mixing time. LIMITATIONS Excessive water addition or overdosing may cause bleeding or segregation. ▪ If frozen and/or separation of the product has occurred, Sika® ViscoCrete®-20 HE may be used after thawing slowly at room temperature and intensive mixing. Before application, suitability tests must be performed. ▪ BASIS OF PRODUCT DATA All technical data stated in this Product Data Sheet are based on laboratory tests. Actual measured data may vary due to circumstances beyond our control.
LOCAL RESTRICTIONS ECOLOGY, HEALTH AND SAFETY
For information and advice on the safe handling, storage and disposal of chemical products, users shall refer to the most recent Safety Data Sheet (SDS) containing physical, ecological, toxicological and other safety-related data. LEGAL NOTES The information, and, in particular, the recommendations relating to the application and end-use of Sika products, are given in good faith based on Sika’s current knowledge and experience of the products when properly stored, handled and applied under normal conditions in accordance with Sika’s recommendations. In practice, the differences in materials, substrates and actual site conditions are such that no warranty in respect of merchantability or of fitness for a particular purpose, nor any liability arising out of any legal relationship whatsoever, can be inferred either from this information, or from any written recommendations, or from any other advice offered. The user of the product must test the product’s suitability for the intended application and purpose. Sika reserves the right to change the properties of its products. The proprietary rights of third parties must be observed. All orders are accepted subject to our current terms of sale and delivery. Users must always refer to the most recent issue of the local Product Data Sheet for the product concerned, copies of which will be supplied on request.
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