Fosroc Conbextra PRO 100
A new-generation, low-carbon cementitious precision grout that pours from 10 mm to 150 mm thick in a single operation — engineered for precast, baseplates and bridge bearings.
What is it?
A single-component, non-shrink cementitious precision grout built on Fosroc’s PRO (Polycarboxylate Rheology Optimized) technology, mixed on site with water and poured to fill gaps from 10 mm up to 150 mm thick in one operation without adding aggregate.
Where is it used?
Precast segment jointing, structural steel baseplates and stanchions, machine bedplates, crane and gantry rails, bridge bearing pedestals, and grouting around reinforcement starter bars — on building, infrastructure, metro and industrial projects across India.
Why use it?
It replaces several conventional grout grades with one product: a wide 10–150 mm thickness window, rapid set allowing de-moulding within a day, high early strength to keep programmes moving, smooth high flow for full contact, and a reduced CO2 footprint versus standard cementitious grouts.
How is it applied?
Mechanically gauged with clean water to a flowable consistency, then placed by gravity pour or pump from one side of the void so air is pushed out and continuous contact under the baseplate or joint is achieved, followed by standard curing.
About Fosroc Conbextra PRO 100
Fosroc Conbextra PRO 100 is the newest member of the long-established Conbextra family of cementitious precision grouts, and it represents a genuine step-change rather than a relabelled grade. Conventional non-shrink grouts force the specifier to pick a product by gap thickness — a flowable grade for thin sections, an aggregate-extended grade for deep pours — which means juggling several materials, multiple data sheets and the risk of the wrong bag reaching site. Conbextra PRO 100 collapses that decision into one product. A single formulation can be cast at any thickness between 10 mm and 150 mm in a single application, with no site-added aggregate or filler, so a contractor can use the same grout under a thin baseplate and inside a deep precast pocket on the same day. The engine behind this is what Fosroc calls PRO technology — Polycarboxylate Rheology Optimized — a modern polycarboxylate-based admixture chemistry that delivers high flow at a controlled water content, which in turn supports strength, durability and a lower clinker-related carbon footprint. For Indian projects working to tight de-shuttering cycles, the headline behaviours are rapid set (de-moulding is achievable within a day), high early strength to accelerate the construction sequence, an extended working window that suits warm placing conditions, and excellent self-levelling flow that fully wraps reinforcement and base plates. As an authorised Fosroc distributor and applicator serving Delhi NCR and the rest of India, Space Arc Engineering supplies Conbextra PRO 100, advises on the right grade for each detail, and can support method statements, trial mixes and on-site placement so the grout performs exactly as the structural drawings intend.
The technical insight
The defining technical feature of Conbextra PRO 100 is its use of polycarboxylate-ether (PCE) rheology control rather than the older naphthalene or melamine superplasticiser systems found in many legacy grouts. PCE chemistry lets the grout reach a high, stable flow at a comparatively low water-to-powder ratio. Because excess gauging water is the single biggest enemy of grout durability — it drives bleed, plastic settlement, capillary porosity and ultimately lower strength — keeping water demand down while preserving flow is what allows one product to span the full 10–150 mm range without segregating in deep pours or stiffening too fast in thin ones. The same low-water, optimised-binder approach is what underpins the reduced CO2 claim: a more efficient binder system needs less cement clinker per unit of strength, and clinker is where the embodied carbon of any cementitious grout concentrates. As a non-shrink grout it is dimensionally stabilised so that, once placed, it does not pull away from the baseplate or joint faces and leave a gap under load — the property that distinguishes a precision grout from ordinary cement mortar. The practical takeaways for site teams are familiar grout discipline: gauge by weight with the manufacturer’s recommended water, mix mechanically to a lump-free flowable mix, place from one side to expel air, and never re-temper a stiffening mix with extra water. Because exact published figures for compressive strength, fresh density, flow span and water demand vary by region and revision, the controlling document is always the current country-specific Conbextra PRO 100 Technical Data Sheet, which Space Arc can supply for your project location.
Where it is used
- Jointing and fixing of precast concrete segments in segmental and modular construction
- Bedding structural steel baseplates and stanchions onto foundations
- Grouting bridge bearings and bearing pedestals on highway and metro viaducts
- Fixing crane rails, gantry rails and track baseplates
- Anchoring and grouting reinforcement starter bars and holding-down bolts
- Filling deep pockets and column-to-foundation connections up to 150 mm in a single pour
- Bedding machine bases and equipment frames where rapid return-to-service is needed
- General non-shrink precision grouting where a wide thickness range from one product is preferred
Key advantages
- One product covers a 10–150 mm thickness range, replacing several conventional grout grades and reducing the chance of the wrong grade reaching site
- No site-added aggregate or filler required, even for deep pours — fewer variables and more consistent results
- Rapid setting allows de-moulding and the next construction step within a day, shortening cycle times
- High early strength helps accelerate programmes and supports early loading where permitted
- Excellent self-levelling flow from PRO (polycarboxylate) rheology fully encases reinforcement, bolts and baseplates
- Extended working/application time suits Indian warm-weather placing and larger pours
- Lower CO2 footprint than standard cementitious grouts, supporting greener project specifications and IGBC/LEED-oriented procurement
- Non-shrink behaviour maintains full load-bearing contact under plates and in joints
Limitations & considerations
- It is a cementitious grout — for the most aggressive chemical exposure or the very highest dynamic-load/impact duties, an epoxy grout such as Conbextra EP series may be more appropriate
- Performance depends on disciplined site practice: over-watering, hand-mixing to a poor consistency, or re-tempering a stiffening mix will reduce strength and durability
- Rapid set means working time is finite — mix only what can be placed promptly, especially in high ambient temperatures
- Requires sound, clean, pre-saturated (saturated surface-dry) substrates and proper formwork/leak sealing for deep or flowable pours
- Exact published values (compressive strength, density, flow, water demand, pack size) are region- and revision-specific and must be read from the current local Technical Data Sheet rather than assumed
- As a newer product, it should be cross-checked against the project specification, since some older specs still name legacy grades like Conbextra GP2 or HF by name
Selection & best practice
Always work to the current country-specific Conbextra PRO 100 Technical Data Sheet for water dosage, mixing and placement. Prepare the substrate first: it must be sound, clean and free of laitance, oil and loose material, and pre-soaked to a saturated surface-dry condition with no standing water. Set leak-tight formwork with a head box or grout dam on the pour side, and provide a 100 mm minimum unrestricted flow path where possible. Gauge powder with clean water measured by the data-sheet ratio — never by eye — and mix mechanically with a slow-speed drill and paddle until lump-free and uniformly flowable; avoid entraining air. Pour continuously from one side only so air is driven ahead of the grout and the entire void fills without trapped voids; do not vibrate aggressively or pour from both sides. Never add extra water to restore workability to a stiffening mix. Cure exposed surfaces immediately with Fosroc curing membrane or wet hessian, which matters most in dry, windy or high-temperature conditions common across northern India. Run a small trial pour for critical or large grouting works, and engage Space Arc Engineering early for method-statement review and on-site support.
Specifications
| Product type | Single-component non-shrink cementitious precision grout |
| Core technology | PRO technology — Polycarboxylate Rheology Optimized (PCE-based) |
| Product family | Fosroc Conbextra precision grout range |
| Application thickness (single pour) | 10 mm to 150 mm, no added aggregate/filler |
| Flow characteristic | High, self-levelling flowable consistency (gravity pour / pumpable) |
| Setting behaviour | Rapid set — de-moulding achievable within one day |
| Early strength | High early strength to accelerate construction (see local TDS for MPa values) |
| Volume stability | Non-shrink / shrinkage compensated |
| Sustainability | Reduced CO2 footprint vs standard cementitious grouts |
| Working time | Extended application window (temperature dependent) |
| Mixing | Mechanical mixing with clean water per TDS ratio |
| Substrates | Concrete, masonry, steel baseplates, reinforcement / starter bars |
| Exact strength / density / flow / pack size | Region-specific — refer to current local Conbextra PRO 100 TDS (available from Space Arc) |
Industry use cases
Metro & Bridges
Grouting bridge bearing pedestals and precast segment joints on metro viaducts and highway flyovers, where the 10–150 mm range handles both thin bearing beds and deeper segment pockets from one product.
Industrial & Power
Bedding machine bases, structural steel baseplates and equipment frames where rapid set enables quick return-to-service and minimal plant downtime.
Precast & Modular Construction
Jointing precast segments and column-to-foundation pockets with a high-flow, non-shrink grout that fully encases connections without site-added aggregate.
High-Rise & Commercial Buildings
Fixing stanchions, holding-down bolts and starter bars during fast-track frame erection, using high early strength to keep the construction sequence moving.
Ports, Cranes & Heavy Logistics
Grouting crane rails, gantry rails and track baseplates that carry repeated heavy loads and demand continuous, void-free contact under the plate.
Frequently asked questions
Is Conbextra PRO 100 a cementitious or an epoxy grout?
What thickness can Conbextra PRO 100 be poured at?
How quickly can I de-mould and move on?
Why is it promoted as a lower-carbon grout?
How does it compare with Conbextra GP2 or HF that my old spec calls for?
Can Space Arc Engineering supply it across India and support application?
How we position Fosroc Conbextra PRO 100
Within the Fosroc grouts-and-anchors range, Conbextra PRO 100 sits as the modern, do-more flagship of the cementitious Conbextra family, designed to consolidate jobs that previously needed several grades. It complements rather than fully replaces established siblings: Conbextra GP and GP2 remain widely specified general-purpose precision grouts, Conbextra HF and HS cover high-flow and high-strength duties, Conbextra HR addresses shrinkage-compensated requirements, and where chemical or extreme dynamic resistance is needed the epoxy Conbextra EP grouts (such as EP10/EP75) take over. PRO 100’s differentiator is the 10–150 mm single-pour range, rapid one-day de-moulding, high early strength and a reduced CO2 footprint from its PCE-based PRO technology — a strong fit for fast-track precast, bridge-bearing and baseplate work. It pairs naturally with other Fosroc products on the same details, including Nitobond bonding aids, Conbextra anchoring grouts and Fosroc curing membranes. Specifiers comparing brands will find credible Indian-market alternatives in Sika (SikaGrout range), MBCC/Master Builders Solutions (MasterFlow grouts), Dr. Fixit (Pidilite’s grouting compounds) and STP/Krishna Conchem; the right choice usually comes down to the verified figures in the current data sheet, available approvals and on-site support. Space Arc Engineering supplies Conbextra PRO 100 with authorised-distributor backing and applicator expertise across Delhi NCR and Pan-India, and can provide the region-specific TDS so the exact strength, density and flow values are confirmed for your project before specification.
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