Fosroc Renderoc TS-IC
Thixotropic, sulphate-resistant repair mortar with an integral corrosion inhibitor, engineered for reinforced concrete in coastal, marine and sulphate-bearing-soil environments.
What is it?
A single-component, cementitious thixotropic repair mortar that combines sulphate resistance with a built-in corrosion inhibitor, classified as an EN 1504-3 R4 structural repair material.
Where is it used?
Reinforced concrete structures in coastal zones, seaports, jetties, tidal and splash zones, and foundations sitting in sulphate-bearing ground or groundwater.
Why use it?
It tackles two of the most aggressive durability threats together — sulphate attack on the matrix and chloride/carbonation-driven corrosion of the rebar — in one trowel- or spray-applied product, so patch repairs in marine and chemically aggressive settings last instead of failing again at the patch edge.
How is it applied?
Applied by hand trowel or by wet/dry spray onto a prepared, saturated-surface-dry substrate after rebar cleaning and priming, built up in controlled layers and cured to protect the compensated-shrinkage matrix.
About Fosroc Renderoc TS-IC
Fosroc Renderoc TS-IC is a factory-blended, cementitious thixotropic repair mortar designed for the structural repair and protection of reinforced concrete exposed to two of the most punishing durability threats found on Indian projects — sulphate attack and reinforcement corrosion. The “TS” denotes the thixotropic, sulphate-resistant base familiar to specifiers from the wider Renderoc range, while the “IC” suffix signals the addition of an integral corrosion inhibitor. That combination is the product’s whole reason for existing: it is formulated specifically for concrete in coastal zones, seaports and any structure founded in or surrounded by sulphated soils and groundwater. For a country with thousands of kilometres of coastline and large stretches of saline and sulphate-rich subsoil across coastal Gujarat, Maharashtra, the Konkan belt, Tamil Nadu and the eastern seaboard, this is a genuinely targeted repair material rather than a generic patching mortar. As an EN 1504-3 R4-class repair mortar, it sits at the high-performance, structural end of the repair spectrum. It is supplied as a single-component powder that requires only the addition of clean water on site, which keeps batching simple and reduces the risk of mix-ratio errors on a busy repair gang. Once mixed, the thixotropic consistency lets it be built up on vertical faces and overhead soffits without slumping or sagging, and it can be placed by hand trowel or by wet- or dry-spray equipment for larger areas. Space Arc Engineering supplies Renderoc TS-IC as an authorised Fosroc distributor across Delhi NCR and Pan-India, and the notes below are written to help engineers, applicators and consultants specify it correctly. Because TS-IC is a region-specific formulation within Fosroc’s catalogue, project teams should always confirm the exact graded values against the country-specific Technical Data Sheet for the batch supplied, as Fosroc publishes localised datasheets for different markets.
The technical insight
The engineering logic of Renderoc TS-IC rests on attacking the corrosion cell from both sides simultaneously. Conventional reinforced-concrete deterioration in marine and aggressive-soil exposure follows two coupled mechanisms: sulphate ions react with the cement hydrates (forming expansive ettringite and gypsum that crack and soften the matrix), while chloride ingress and carbonation depassivate the steel and drive electrochemical corrosion that spalls the cover concrete. A standard repair mortar that ignores either pathway tends to fail again at the interface — the so-called “incipient anode” or ring-anode effect, where a fresh, dense, high-alkalinity patch shifts corrosion activity to the adjacent, still-contaminated parent concrete. Renderoc TS-IC is built to break this cycle. Its binder uses a sulphate-resisting cement chemistry, so the matrix itself is far less vulnerable to ettringite-driven expansion than ordinary Portland cement mortar. Layered on top of that, the integral corrosion inhibitor migrates to and adsorbs onto the reinforcement surface, re-establishing a protective environment around the steel within both the repair zone and the immediately surrounding concrete. The mortar is also engineered for low permeability, with additives that densify the matrix to restrict the onward diffusion of carbon dioxide and chloride ions — closing the door behind the repair rather than just cosmetically covering damage. Finally, the formulation is shrinkage-compensated, which is what allows comparatively large surface areas to be reinstated in a single campaign without the map-cracking that plagues high-shrinkage mortars. With a fresh wet density in the order of 2.2 kg/litre, it forms a dense, well-bonded reinstatement that behaves structurally like the parent concrete it replaces.
Where it is used
- Repair of spalled and delaminated cover concrete on coastal and marine reinforced-concrete structures
- Reinstatement of corrosion-damaged columns, beams, pile caps and soffits in seaport and jetty structures
- Patch and large-area repair of foundations and substructures sitting in sulphate-bearing soils or groundwater
- Repair of tidal-zone, splash-zone and seawater-exposed concrete on harbour walls and breakwater elements
- Rehabilitation of bridge substructures and abutments in saline coastal estuarine environments
- Repair of effluent, sewage and water-treatment structures exposed to sulphate-rich liquids
- Protective reinstatement of cooling-water and seawater-intake structures at coastal power and industrial plants
- Vertical and overhead concrete repairs where a non-sag, sprayable or trowel-applied mortar is required
Key advantages
- Dual protection in one product — sulphate-resistant matrix plus an integral corrosion inhibitor for the embedded steel
- Specifically formulated for coastal, marine and sulphated-soil exposure rather than adapted from a general-purpose mortar
- Thixotropic, non-sag consistency permits build-up on vertical and overhead surfaces without formwork
- Versatile placement by hand trowel or by wet/dry spray, suiting both localised patches and large surface areas
- Shrinkage-compensated formulation allows large areas to be reinstated with reduced risk of cracking
- Low-permeability matrix resists onward ingress of chloride ions and carbon dioxide, extending repair life
- Single-component, water-only mixing simplifies on-site batching and reduces dosing errors
- Excellent adhesion to a properly prepared concrete substrate for a durable, monolithic repair
- EN 1504-3 R4 structural-grade classification, suitable for load-bearing repair situations
Limitations & considerations
- Not a general-purpose mortar — its sulphate-resistant, corrosion-inhibiting formulation is premium-priced and only justified in genuinely aggressive marine or sulphate exposure
- Performance depends heavily on correct surface preparation: breaking out to sound concrete, exposing and cleaning corroded steel to bright metal, and achieving a saturated-surface-dry substrate
- The integral inhibitor supplements but does not replace good cover, sound detailing and, where warranted, a separate anti-corrosion primer and protective coating system
- As a cementitious material it requires disciplined curing in India’s hot, windy and high-evaporation conditions to avoid plastic and drying shrinkage cracking
- Application thickness must be built within the manufacturer’s stated minimum and maximum per-layer limits; over-thick lifts risk slumping or shrinkage
- It controls future ingress but cannot reverse chloride contamination already deep within retained parent concrete, which may need additional measures such as realkalisation or cathodic protection
- Graded property values differ between Fosroc’s country-specific datasheets, so values must be confirmed against the TDS for the exact product supplied
- Cold conditions and incorrect water content can compromise strength gain and the action of the corrosion inhibitor
Selection & best practice
Treat Renderoc TS-IC as one element of a full repair system, not a stand-alone patch. Begin by breaking out all unsound and chloride-contaminated concrete back to sound substrate, cutting square edges to avoid feather-edging, and exposing corroded reinforcement fully around its circumference. Clean the steel to bright metal by grit blasting or wire brushing to Sa 2 or St 3, then apply the appropriate Fosroc reinforcement primer (such as the Nitoprime/Nitozinc range or the system specified for the TS-IC) before the mortar. Pre-soak the substrate to a saturated-surface-dry condition so the parent concrete does not draw mixing water out of the mortar. Mix only with clean, potable water in the dosage stated on the country-specific TDS, using a forced-action or slow-speed drill mixer to a lump-free, cohesive consistency, and apply within the working life of the mix. Build up in layers within the stated thickness limits, compacting firmly against the substrate and primed steel to eliminate voids. For large areas, wet or dry spray gives better productivity and compaction than hand trowelling. Cure rigorously — in Indian summer and coastal wind, use Fosroc curing membrane (Concure range), wet hessian or polythene to hold moisture for the recommended period. Where the structure faces continuous marine exposure, finish with a fairing coat and a protective anti-carbonation or anti-chloride coating to maximise service life.
Specifications
| Product type | Cementitious thixotropic repair mortar with integral corrosion inhibitor |
| Base chemistry | Sulphate-resisting cement-based, single-component (powder + water) |
| EN 1504-3 classification | R4 (structural repair mortar) |
| Fresh wet density | Approx. 2.2 kg/litre |
| Sulphate resistance | Yes — sulpho-resistant formulation for sulphated soils/waters |
| Corrosion protection | Integral corrosion inhibitor incorporated in the mix |
| Shrinkage | Compensated (shrinkage-controlled) for large-area repair |
| Permeability | Low; additives restrict CO2 and chloride-ion ingress |
| Consistency | Thixotropic / non-sag (vertical and overhead capable) |
| Application methods | Hand trowel, wet spray or dry spray |
| Mixing | Single-component, clean water only added on site |
| Primary exposure suitability | Coastal zones, seaports, sulphate-bearing soils and groundwater |
| Note on graded values | Confirm strength/thickness figures against the country-specific Fosroc TDS for the batch supplied |
Industry use cases
Ports & Marine
Reinstating spalled, corrosion-damaged concrete on jetties, quay walls, berthing structures and pile caps in Indian seaports where both chloride-driven rebar corrosion and seawater sulphate attack are active in tidal and splash zones.
Coastal Infrastructure & Bridges
Repairing substructures, abutments and piers of coastal and estuarine bridges along saline stretches of the Gujarat, Konkan, Tamil Nadu and eastern coastlines, where conventional mortars fail prematurely at patch edges.
Power & Industrial Plants
Rehabilitating seawater-intake channels, cooling-water structures and foundations at coastal thermal, nuclear and desalination plants exposed to chloride and sulphate-laden water.
Water & Effluent Treatment
Patching and reinstating concrete in sewage and effluent-treatment tanks and structures subject to sulphate-rich liquids, where the sulphate-resistant matrix protects the repair from chemical breakdown.
Foundations in Aggressive Soils
Repairing footings, pile caps and basements of buildings and industrial sheds founded in sulphate-bearing ground or saline water tables common across coastal and certain inland Indian sites.
Building Maintenance & Façades
Restoring corroded reinforced-concrete balconies, columns and façade elements of coastal residential and commercial buildings where salt-laden air accelerates carbonation and chloride attack.
Frequently asked questions
What exactly does the ‘IC’ in Renderoc TS-IC stand for?
When should I choose Renderoc TS-IC over a standard Renderoc repair mortar?
Is Renderoc TS-IC a structural repair material?
Can it be sprayed for large areas, or only trowelled?
Does the built-in corrosion inhibitor mean I can skip rebar priming?
Where can I buy Renderoc TS-IC in India and get technical support?
How does Renderoc TS-IC compare with Sika and other brands’ marine repair mortars?
How we position Fosroc Renderoc TS-IC
Within Fosroc’s repair range, Renderoc TS-IC is the specialist marine/aggressive-exposure grade: it adds sulphate resistance and an integral corrosion inhibitor on top of the standard thixotropic Renderoc base (Renderoc TS), distinguishing it from general-purpose structural patch mortars like Renderoc HB, Renderoc GP and Renderoc S, and from flowable micro-concretes like Renderoc LA/LA55 used for formed, large-volume reinstatement. Pair it with Fosroc reinforcement primers (Nitozinc/Nitoprime), Concure curing membranes and an anti-carbonation/anti-chloride protective coating (Dekguard range) to build a complete EN 1504 repair system. Against the wider market it sits alongside corrosion-protected repair mortars such as Sika MonoTop and SikaTop, MC-Bauchemie/MBS Nafufill systems, Dr. Fixit and STP repair ranges; the chemistry is broadly comparable, so selection typically turns on the project’s specified system, datasheet conformity, local technical support and supply. Space Arc Engineering positions TS-IC for clients who need a proven, single-source Fosroc solution for coastal, port and sulphate-soil repairs rather than a commodity patching mortar — and will recommend a more economical Renderoc grade where the aggressive-exposure premium is not warranted.
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