About Fosroc Auramix 100

Fosroc Auramix 100 is a normal water-reducing admixture engineered for ready-mix and general structural concrete. Unlike single-chemistry plasticisers, it is formulated as a hybrid system: selected lignosulphonates supply robust, cost-effective water reduction and cohesion, while the latest generation of polycarboxylate (PCE) polymers add a dispersion boost and strength performance more usually associated with higher-range admixtures. The result is a versatile, everyday admixture that suits producers who want dependable plasticising behaviour with a cleaner strength and durability profile than a basic lignosulphonate alone.

The product is supplied as a low-viscosity brown liquid that disperses instantly into the batch water, making it straightforward to meter through automated RMC dosing systems. It is chloride-free, so it can be used with confidence in steel-reinforced and prestressed concrete where embedded-metal corrosion is a concern. Auramix 100 is positioned as the entry point of Fosroc’s broader Auramix admixture family, sitting below the dedicated superplasticisers (Auramix 200/300/400 series) that deliver higher water reduction and flow for self-compacting or very high-strength work.

For Indian projects, Space Arc Engineering supplies Auramix 100 as part of Fosroc’s concrete admixtures portfolio. As with all admixtures, the governing technical data sheet and dosage are region-specific, and material is dispatched against the official Fosroc datasheet applicable to the supply territory. Our team helps RMC producers, contractors and consultants match the right Auramix grade to the target slump, strength class and exposure condition, and we provide batching guidance and compatibility checks for the cement and supplementary cementitious materials (fly ash, GGBS, microsilica) actually being used.

The technical insight

The defining feature of Auramix 100 is its dual-polymer architecture. Conventional lignosulphonate plasticisers work mainly by electrostatic repulsion and tend to plateau in water reduction, sometimes with mild retardation or air entrainment at higher doses. Polycarboxylate ether polymers, by contrast, disperse cement grains through steric (physical side-chain) hindrance, which is far more efficient and largely dose-stable. By combining the two, Fosroc gets the economy and cohesion of lignosulphonates with a PCE-driven uplift in early strength and workability retention, and crucially does so without the set retardation that producers fear when chasing extra water reduction. Practically, this means a mix can hold its target slump for longer through transit while still stripping formwork and gaining strength on schedule. Because it is chloride-free, Auramix 100 does not contribute to the chloride budget of reinforced concrete, which matters for durability codes that cap acid-soluble chloride. As a water reducer it should be classed against BS EN 934-2 (and, for Indian supply, the equivalent IS 9103 plasticiser requirements); confirm the exact performance class, typical dose and relative density from the territory-specific datasheet before specifying.

Where it is used

• Ready-mix concrete (RMC) production where consistent workability and water reduction are needed across many mixes
• General reinforced concrete structural elements – footings, rafts, columns, beams and suspended slabs
• Concrete requiring improved early and final compressive strength without changing the cement content
• Mixes where reduced drying shrinkage and lower permeability improve long-term durability
• Both low-workability (pumped/placed) and higher-workability flowing concrete within the normal plasticiser range
• Steel-reinforced and prestressed concrete where a chloride-free admixture is mandatory
• Concrete using blended cements or SCMs (fly ash/PFA, GGBS, microsilica) needing reliable plasticising response

Key advantages

• Chloride-free – safe for steel-reinforced and prestressed concrete and friendly to durability/corrosion requirements
• Hybrid lignosulphonate + polycarboxylate chemistry combines economy with PCE-grade strength performance
• Increases both early and final compressive strengths at a given workability
• Excellent workability retention with no set retardation, helping maintain slump through transit
• Reduces drying shrinkage and concrete permeability for better long-term durability
• Low-viscosity liquid that disperses instantly in water and meters easily through automated RMC dosing
• Versatile across low- to high-workability mixes and compatible with common cements and SCMs

Limitations & considerations

• It is a normal water-reducer/plasticiser, not a high-range superplasticiser – for self-compacting or very high-strength flowing concrete, step up to the Auramix 200/300/400 superplasticiser range
• Optimum dosage must be established by trial mixes on the actual materials; overdosing can cause excess retardation, bleeding or segregation
• As a liquid, it must be protected from freezing and stored within the manufacturer’s temperature window; reconstitute per Fosroc guidance if it has frozen
• Always add with the mixing water – never directly onto dry cement or aggregate – to avoid balling and uneven dispersion
• Auramix 100 is documented primarily under Fosroc’s UK/EN range (UKCA Declaration of Performance); confirm the India-specific TDS, dose and standard classification before specifying on Indian projects
• Performance depends on cement chemistry and SCM content; compatibility should be verified when changing cement source or mix design

Selection & best practice

Specifications

Industry use cases

How we position Fosroc Auramix 100

Within Fosroc’s Auramix line, Auramix 100 is the entry-level water reducer: it covers everyday plasticising duty, while the Auramix 200, 300, 300 Plus and 400 grades are the high-range superplasticisers reached for when self-compacting, very high-strength or high-flow concrete is needed. Related Fosroc products a buyer often pairs it with include the Conplast admixture and curing range and Fosroc’s SCM-compatible superplasticisers. Against the wider market, credible alternatives in the normal/mid-range water-reducer category include Sika (Sikaplast / Plastiment plasticisers), Master Builders Solutions (MasterPozzolith / MasterPolyheed), and for the broader Indian construction-chemicals space brands such as Dr. Fixit (Pidilite) and STP supply admixtures and allied products. Auramix 100’s distinguishing pitch is its lignosulphonate-plus-PCE hybrid chemistry, delivering near-superplasticiser strength behaviour and chloride-free safety at a normal-plasticiser position. Space Arc Engineering, as an authorised Fosroc distributor in Delhi NCR and Pan-India, can help specify Auramix 100 versus a higher Auramix grade or a competitor product based on your target slump, strength class and exposure conditions.

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