Sika ViscoCrete-730 PR
A third-generation polycarboxylate superplasticiser that pushes water reduction hard, so you get denser, stronger, more flowable concrete without losing workability on the way to the pour.
What is it?
A high-range water-reducing admixture built on a modified polycarboxylate (PCE) polymer, supplied as a brown liquid at roughly 1.10 kg/l and free of added chloride.
Where is it used?
Ready-mix plants, precast yards and site batching for self-compacting, high-strength, pumped and water-retaining concrete across Delhi NCR and pan-India projects.
Why use it?
It cuts a large amount of mix water while keeping the concrete flowing, which lifts strength and durability and lets you place dense concrete in congested reinforcement.
How is it applied?
Dosed at 0.2-2.0% by weight of cementitious material, added to the mixing water or into the mixer after 50-70% of the water, then wet-mixed for at least 60 seconds.
About Sika ViscoCrete-730 PR
Sika ViscoCrete-730 PR is a third-generation superplasticiser designed for producers who need genuine high-range water reduction rather than a modest workability aid. Chemically it is an aqueous solution of modified polycarboxylate, the polymer family that replaced older naphthalene and melamine chemistries because it delivers far more water reduction at lower dosage. In practice that means a mix can be designed with a low water-cement ratio yet still flow, pump and self-level, which is exactly the combination a modern concrete producer is chasing when specifications call for high early strength alongside good site placeability.
The product arrives as a brown liquid with a density of about 1.10 kg/l at 25 degrees Celsius and carries no added chloride, so it sits comfortably in reinforced and prestressed work where chloride ingress is a durability concern. For a distributor-and-applicator like Space Arc Engineering, it is a workhorse admixture: one product that a ready-mix operator can trim water on, a precaster can use to hit demoulding strengths faster, and a site team can rely on to move stiff, heavily reinforced sections into place. It is supplied in 255 kg HDPE drums as well as bulk, which suits both jobbing quantities and continuous plant supply.
The technical insight
The mechanism is what separates a polycarboxylate from the older sulphonated plasticisers. Each PCE molecule has a backbone that adsorbs onto the cement grain and long side chains that project outward into the mix water. As soon as water and cement meet, those grains naturally want to clump; the adsorbed polymer keeps them apart through two effects working together. First is electrostatic repulsion from the charged backbone, and second, more importantly, is steric hindrance, where the physical bulk of the side chains simply prevents particles from packing together. With the cement fully dispersed, a large fraction of the water that would otherwise be trapped between flocs is freed to lubricate the mix. That is why the same slump can be achieved with dramatically less water, and why lowering the water-cement ratio at constant slump produces the denser microstructure that raises strength and cuts permeability. Reduced permeability is the durability payoff: less connected pore space means slower ingress of water, chlorides and other aggressive agents into the hardened concrete.
Where it is used
- Self-compacting concrete
- High-strength concrete
- Precast and prestressed elements
- Ready-mix concrete
- Pumped concrete
- Water-retaining structures
Key advantages
- High-range water reduction that lifts compressive strength at the same cement content
- Denser, less permeable concrete for better long-term durability
- Excellent flowability and self-levelling behaviour, ideal for congested formwork
- No added chloride, suitable for reinforced and prestressed concrete
- Effective across a wide dosage band, giving formulators room to fine-tune mixes
- Faster early strength development, supporting quicker precast cycle times
- Reduced risk of honeycombing and voids because the mix consolidates more readily
- Compatible with a broad range of cements used in Indian concrete practice
Limitations & considerations
- Overdosing can cause excessive retardation, bleeding or segregation, so trial mixes are essential
- Performance and optimum dosage vary with cement source, fly ash or GGBS content and aggregate, requiring site-specific calibration
- As a water-based liquid it must be protected from freezing and stored within the recommended temperature range
- Being highly plasticising, mixes need proper cohesion design; it is not a substitute for good aggregate grading or mix proportioning
- Not a set accelerator or a corrosion inhibitor on its own; those functions need complementary admixtures
- Handling still calls for gloves and eye protection, and the safety data sheet should be reviewed before use
Selection & best practice
Always establish dosage through laboratory and plant trial mixes before production, because the right rate within the 0.2-2.0% window depends heavily on your specific cement, supplementary materials and target slump or slump-flow. Add the admixture either to the gauging water or to the mixer after 50-70% of the mixing water is already in; adding it to dry cement gives poor dispersion. Allow a minimum wet-mixing time of about 60 seconds so the polymer can adsorb and disperse fully. Avoid front-loading the entire water charge and then chasing workability with more admixture, which risks bleeding and segregation. Keep drums sealed and stored between roughly +10 and +40 degrees Celsius, protect from frost, and homogenise the container if it has been standing. On site, verify slump retention against your delivery-to-placement time so the mix is still workable when it reaches the form.
Specifications
| Chemical base | Aqueous solution of modified polycarboxylate (third-generation PCE) |
| Function | High-range water reducer / superplasticiser |
| Appearance / colour | Brown liquid |
| Density | approximately 1.10 kg/l at 25 C |
| Chloride content | No added chloride |
| Recommended dosage | 0.2 – 2.0% by weight of cementitious material |
| Addition method | Into mixing water, or into the mixer after 50-70% of water is added |
| Minimum wet-mixing time | approximately 60 seconds |
| Packaging | 255 kg HDPE drum and bulk supply |
Industry use cases
Ready-Mix Concrete
Plants use it to hold a low water-cement ratio while keeping trucks-worth of concrete workable through transit, delivering consistent high-grade mixes to site.
Precast & Prestressed
Precasters exploit its fast early strength to demould sooner and turn moulds around quicker, while the chloride-free formulation suits prestressed strand.
Infrastructure & Water Retention
For tanks, reservoirs and treatment works, the reduced permeability it produces helps meet the tight durability and low-leakage demands of water-retaining concrete.
High-Rise & Congested Structures
In heavily reinforced columns, cores and rafts, its self-compacting flow lets concrete fill congested formwork fully, cutting the risk of honeycombing.
Pumped Concrete Placements
The improved flow and cohesion make it well suited to long horizontal runs and tall vertical pumping on large commercial and infrastructure jobs.
Frequently asked questions
What exactly is Sika ViscoCrete-730 PR used for?
What dosage should I use?
Is it chloride-free and safe for reinforced or prestressed concrete?
How and when do I add it to the mix?
What pack sizes and storage conditions apply?
Can Space Arc help me select and dose the right admixture?
How we position Sika ViscoCrete-730 PR
Within the Sika range, ViscoCrete-730 PR is a general-purpose third-generation superplasticiser; where a project needs even higher slump retention or specialised self-compacting performance, the sibling Sika ViscoCrete-830 PR or the retarding-grade 753 PR are worth evaluating, and Sika Plastiment plasticisers cover lighter, economy water-reduction duties. It pairs naturally with Sika curing compounds and Sika waterproofing admixtures on water-retaining work. Because Space Arc carries multiple brands, teams standardised on other suppliers can also consider comparable PCE admixtures from Fosroc, MC-Bauchemie or Master Builders Solutions; our technical team can cross-match dosage and performance to whatever mix design and specification you are working to.
Fosroc Auramix 400 — A specifier standardised on Fosroc, or one who needs explicit IS 9103 and ASTM C494 Type G conformance stated on the data sheet, may prefer this equivalent PCE-based superplasticiser for self-compacting and pumped concrete.
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