Fosroc Renderoc LA EG
Single-component, free-flowing, shrinkage-compensated micro-concrete for high-volume structural concrete reinstatement into congested or restricted-access sections from 40 mm to 150 mm thick.
What is it?
A pre-bagged, single-component cementitious micro-concrete (graded Portland-cement system) that needs only clean water on site to produce a free-flowing, self-compacting, shrinkage-compensated repair concrete for large-volume reinstatement.
Where is it used?
Structural repair of reinforced concrete — bridge piers and beams, columns, soffits, water-retaining structures, jetties and marine works, industrial floors and machine bases — wherever sections are deep, reinforcement is congested or access is restricted.
Why use it?
It flows and self-compacts into congested or hard-to-reach sections without vibration, while a dual-expansion system compensates for shrinkage so the repair bonds tightly and stays durable, with low permeability and low alkali content guarding against carbonation, chloride attack and ASR.
How is it applied?
Saw-cut and break out the repair to at least 40-50 mm, clean and pre-soak the substrate, fix rigid sealed formwork, then mix one full 25 kg bag with the specified clean water (about 3.3-3.4 litres) in a forced-action mixer and pour or pump into place within ~30 minutes; cure immediately after striking formwork.
About Fosroc Renderoc LA EG
Fosroc Renderoc LA EG is part of Fosroc’s well-established Renderoc concrete-repair range and sits in the “fluid micro-concrete” sub-family alongside Renderoc LA and Renderoc RG. The “LA” denotes its low-alkali formulation; “EG” is the regional product designation under which Fosroc markets this micro-concrete in its Egypt/Middle East line, and the same technology is supplied across Fosroc territories worldwide. It is a single-component, ready-to-use blend of Portland cement, carefully graded aggregates and proprietary additives. On site, only the controlled addition of clean water is required to produce a free-flowing, self-compacting, shrinkage-compensated micro-concrete suitable for large-volume reinstatement of reinforced concrete. The official Fosroc product page describes it as a “cementitious flowable non-shrink micro concrete grout for repair of damaged concrete,” recommended for placement in nominal sections from 40 mm up to 150 mm. Because the material self-levels and self-compacts, it is the natural choice where vibration is impractical — deep sections, congested reinforcement cages, or repair zones that can only be reached by pouring or pumping. For Indian contractors, consultants and asset owners, it competes directly with flowable micro-concretes such as Fosroc’s own Renderoc RG, Sika MonoTop / SikaGrout-class micro-concretes, MYK Schomburg and Dr. Fixit / Pidilite repair micro-concretes.
The technical insight
The defining feature of Renderoc LA EG is its dual-expansion (shrinkage-compensation) system, which generates controlled expansion in both the plastic and hardened states. This counters the drying shrinkage that normally opens a debond line between repair and parent concrete — the most common cause of premature repair failure — so the micro-concrete stays in intimate, load-transferring contact with the substrate and the reinforcement. The low water demand of the graded-aggregate blend (water:powder ratio in the region of 0.13-0.14, roughly 3.3-3.4 litres of clean water per 25 kg bag) drives both rapid early strength gain and the dense, low-permeability matrix that resists chloride-ion ingress, carbon-dioxide diffusion and aggressive chemical attack. The “low alkali” chemistry is a deliberate durability measure: by keeping the equivalent sodium-oxide content low (around 2.9 kg/m3 in the LA formulation), the product minimises the risk of triggering alkali-silica reaction (ASR) — important when reinstating concrete that may already be ASR-affected. The cured micro-concrete also shares a coefficient of thermal expansion close to that of host concrete (about 10-12 x 10-6 per degC), so repair and substrate move together under temperature cycling rather than shearing apart.
Where it is used
- Reinstatement of large structural concrete sections — bridge piers, abutments, beams, columns and crossheads — where break-out depth exceeds 40-50 mm
- Repairs into congested reinforcement cages where poker/needle vibration cannot be used
- Restricted-access or blind repairs that must be poured or pumped into sealed formwork (soffits, deep pockets, behind reinforcement)
- Thick-section non-shrink grouting of machine bearing plates, base plates and equipment foundations
- Repair and strengthening of water-retaining and marine structures (tanks, jetties, sea-front RCC) requiring low chloride permeability
- Reinstatement of carbonation- or chloride-damaged concrete after corroded reinforcement has been exposed and cleaned
- Repairs to concrete affected by alkali-silica reaction (ASR) where a low-alkali repair material is specified
Key advantages
- Free-flowing and self-compacting — fills congested and restricted sections with no vibration, eliminating honeycombing
- Dual-expansion system compensates for shrinkage in both plastic and hardened states for a tight, durable bond
- Low-alkali formulation minimises the risk of triggering alkali-silica reaction (ASR)
- High early and ultimate compressive strength (family typically ~45-50 MPa at 7 days and ~60 MPa at 28 days) for fast formwork removal and dependable bearing support
- Excellent bond to clean, pre-soaked concrete substrates without an independent bonding primer in most cases
- Low permeability gives strong resistance to chloride ions, carbon dioxide and aggressive gases — extending the life of embedded steel
- Chloride-free and non-corrosive to reinforcement
- Pre-bagged single-component supply removes site-batching variation — only clean water is added
- Can be placed by pouring or by standard concrete pumping for large pours
Limitations & considerations
- Designed for formed/restrained pours — not suitable for reinstating horizontal surfaces that remain unrestrained during cure (use a hand-applied Renderoc HB/GP-type mortar instead)
- Requires rigid, tightly sealed formwork with access and venting points, which adds time and cost versus trowel-applied mortars
- Minimum practical section is around 40-50 mm; not intended for thin patch or feather-edge repairs
- Must not be part-mixed and the specified water quantity must not be exceeded — over-watering or partial bags sharply reduce performance and void the product guarantee
- Should not be applied when ambient/substrate temperature is at or below 5 degC and falling, and must not be exposed to running water during application or before final set
- Substrate must be saturated surface-dry (pre-soaked) before placing; inadequate preparation compromises bond
- Cement-based — releases alkalis when wet and requires standard PPE and immediate curing after striking formwork
- Exact EG-region values (water demand, strengths, pack size) should be confirmed against the current regional Fosroc TDS for the supplied batch
Selection & best practice
Treat Renderoc LA EG as a structural pour, not a patch. Saw-cut the perimeter to a square edge (10 mm+) to avoid feather-edging, break out to at least 40-50 mm of sound concrete, and abrasive-blast exposed reinforcement to bright steel; where chloride contamination or incipient-anode risk exists, prime steel with Nitoprime Zincrich or install Galvashield embedded anodes. Build rigid, tightly sealed formwork with pour and air-vent points, and pre-soak the substrate for several hours, then remove standing water just before placing. Mix only full 25 kg bags in a forced-action mixer (never free-fall) with the exact specified clean water — adding powder to water — for 2-3 minutes to a smooth, lump-free consistency, and pass through a coarse screen. Place within about 30 minutes to capture full fluidity and expansion; when pumping, prime the line with a cement slurry first. Immediately after striking formwork, soak all faces and apply a curing membrane such as Concure, supplementing with polythene in fast-drying or hot conditions. In summer heat (>35 degC) store bags in shade and use cool water; below 5 degC use warm water (up to ~30 degC) and protect from freezing. Always confirm dosage, coverage and strength values against the current regional TDS for the batch supplied.
Specifications
| Product type | Single-component, free-flowing, low-alkali, shrinkage-compensated cementitious micro-concrete (non-shrink micro-concrete grout) |
| Base composition | Portland cement, graded aggregates and proprietary expansion/flow additives; pre-bagged dry blend |
| Application thickness | Nominal 40 mm up to 150 mm (greater achievable subject to repair geometry; Fosroc to advise) |
| Water addition | Approx. 3.3-3.4 litres clean water per 25 kg bag (water:powder ratio ~0.13-0.14) |
| Yield | Approx. 12 litres of mixed micro-concrete per 25 kg bag |
| Compressive strength (LA family, typical) | ~14 MPa @ 1 day; ~30-33 MPa @ 3 days; ~45-50 MPa @ 7 days; ~60 MPa @ 28 days (BS 1881) |
| Flexural strength (28 days) | >7 N/mm2 (BS 1881 Pt 117) |
| Tensile strength (28 days) | >5 N/mm2 (specification minimum) |
| Modulus of elasticity (28 days) | ~33 kN/mm2 |
| Bond strength (28 days) | ~66 N/mm2 (BS 6319 slant/shear, substrate pre-soaked, no bonding aid) |
| Flow | ~750 mm within 10 seconds (UK DTp BD 27/86 Cl 4.6[b]) |
| Setting time (at 20 degC) | Initial ~6 h 30 min; final ~9 h |
| Fresh wet density | Approx. 2270 kg/m3 (consistency dependent) |
| Coefficient of thermal expansion | 10-12 x 10-6 per degC |
| Chloride content | Chloride-free / contains no chloride admixtures |
| Standards / compliance | Formulated to UK DTp BD 27/86 Cl 4 and DTp Spec for Highway Works Cl 1704.6 (ASR control); LA-class technology aligned with BS EN 1504-3 R4-grade micro-concrete repair |
| Pack size | 25 kg bags |
| Shelf life | Up to 12 months in original sealed bags in cool, dry conditions (reduced to ~4 months in high heat/humidity) |
Industry use cases
Bridges & highway structures
Reinstating spalled or carbonation-damaged piers, pier caps, crossheads and beam soffits in deep sections where vibration is impractical and a low-alkali, low-permeability repair is specified for highway durability.
Water & wastewater infrastructure
Repairing RCC walls, columns and floors of water-retaining tanks, STPs and reservoirs, where low chloride/CO2 permeability protects reinforcement and the non-shrink behaviour preserves water-tightness.
Marine & coastal RCC
Rehabilitating jetties, sea walls and coastal building frames suffering chloride-induced corrosion — flowable placement into congested coastal reinforcement plus dense, chloride-resistant matrix.
Industrial plants & machine foundations
Thick-section non-shrink grouting and reinstatement under bearing plates, equipment bases and heavy machine foundations needing high early strength for fast return to service.
Buildings & structural rehabilitation
Restoring distressed columns, beams and deep slab sections in ageing commercial and residential RCC where access is tight and core load-bearing capacity must be rebuilt.
Frequently asked questions
Is Fosroc Renderoc LA EG a real product?
What is the difference between Renderoc LA EG and a hand-applied mortar like Renderoc HB or GP?
How much water do I add and what is the coverage?
What compressive strength does it reach?
Does it need a bonding primer or steel primer?
What are credible alternatives available in India?
How we position Fosroc Renderoc LA EG
Renderoc LA EG is Fosroc’s go-to flowable micro-concrete for deep, congested and access-restricted structural repairs — the pour-and-pump complement to Fosroc’s hand-applied Renderoc HB and Renderoc GP mortars and a close sibling of the Renderoc RG micro-concrete used widely in India; it pairs naturally with Nitoprime Zincrich (steel primer), Nitobond EP (bonding aid where a barrier is needed), Renderoc Galvashield anodes and Dekguard / Concure protective and curing coatings to form a complete repair system. Against the wider market it competes with Sika’s micro-concrete and grout range (SikaGrout, Sika MonoTop), MBS/MYK Schomburg repair micro-concretes, BASF/MBCC-lineage MasterEmaco systems, and Dr. Fixit (Pidilite) and STP (Pidilite) repair products. Its distinguishing edge is the low-alkali, dual-expansion chemistry — making it a strong specification choice where ASR risk, chloride exposure and a tight, non-shrink bond in heavily reinforced sections all matter at once. Where the repair is shallow, open-faced or horizontal-unrestrained, a hand-applied Renderoc mortar or a flowable competitor of equivalent class may be more economical; for large-volume, deep, formed pours into reinforced concrete, Renderoc LA EG is firmly in its sweet spot. As an authorised Fosroc distributor and applicator across Delhi NCR and pan-India, Space Arc Engineering can supply the product, confirm batch-specific TDS values, and advise on the full repair system and method statement.
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