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Concrete roll

It does not replace structural concrete. It replaces getting a mixer to the site.

A dry cement core needle-punched between two geotextiles and delivered on a roll. Unroll it, fix it, wet it — and 24 to 48 hours later there is a hard, root-resistant, abrasion-resistant concrete surface on ground a batching plant was never going to reach.

The material

Three layers, one of which is the concrete and two of which are the reinforcement.

A flexible multilayer cement-polymer fabric. A nonwoven geotextile on the top face, a dry cementitious mix in the middle, a woven geotextile on the bottom face — and the three bonded together by needle punching, which is the part that matters.

Needle punching drives fibres from the outer layers down through the cement core, so the fibres are not a surface treatment sitting on top of a powder. They run through it. When the material is hydrated and cures, that fibre network is what stops the section cracking as it shrinks, and what lets a cured sheet flex with ground movement instead of fracturing across it. It is the same principle as fibre-reinforced concrete, arrived at through a textile process rather than a batching one.

The woven face goes down, against the subgrade. It is the structural face and the one the anchors bear on. The nonwoven face goes up: it holds the hydration water at the surface long enough for the cement to take it, and it is the face you see once the material has cured, which is why a finished installation reads as grey fabric-textured concrete rather than as a trowelled slab.

Dry, it behaves like heavy carpet — it can be rolled, dragged, cut with a knife or a circular saw, and folded into a corner. Wet, it stops behaving like anything but concrete. There is a working window of one to two hours after hydration begins during which the sheet can still be adjusted; after that the geometry is fixed.

Cross-section: nonwoven geotextile over a dry cement mix over a woven geotextile, with needle-punched fibres running through all three layers

Cross-sectionThe fibres are driven through the cement core, not laid on top of it. That is what stops a cured sheet cracking as it shrinks, and what lets it flex with ground movement afterwards.

End of a roll showing the tightly wound layered material — **Dry, on the roll**Wound layers of geotextile and cement. In this state it cuts with a knife and folds into a corner.

A worker pushing out a roll along a road, dark dry material behind and pale cured surface ahead — **Wet, on the ground**The same material either side of the roll — dark and dry behind it, hydrated and pale in front.

The case

The question is almost never whether concrete would work. It is whether concrete can get there.

Every buyer of this material is solving the same problem in a different setting: a surface that needs armouring, in a place where pouring is disproportionate, impractical or simply impossible.

No batching plant, no formwork, no vibration

The mix is already made, already correct and already in place. Nothing is measured on site, nothing is poured, nothing has to be struck. The heaviest thing on the job is the roll.

No specialist crew

Sledgehammer, screwdriver, knife or circular saw, and a hose with a spray nozzle. A crane with a suspended traverse if the rolls are being placed rather than pushed. No trade qualification is required to install it, which is what makes it viable on remote and short-duration works.

A transport ratio that changes the economics

One 100 m² roll covers the ground two 17-tonne mixer loads would cover. A 40-foot container or a Eurotruck carries 2,000 m². On a remote site that is the whole argument — the material arrives in one movement instead of a convoy with a working time limit.

Roughly ten times the installed rate

Four to six people place 400 to 1,200 m² in a shift, depending on geometry and anchoring. Long linear works — ditches, channels, embankment faces — sit at the top of that range; cut-and-fit work around structures sits at the bottom.

It follows the ground

Laid dry, the sheet takes the profile it is laid on, including irregularities a formwork solution would have to be shaped around. Surface preparation is often reduced rather than eliminated — see what it is not.

It can be hydrated with sea water

Fresh or salt, sprayed unpressurised or by immersion. On coastal, marine and arid works this removes the second logistics problem, which is getting potable water to the face.

Where it does not compete. On accessible ground, with a plant nearby and a large uninterrupted area to cover, poured concrete remains cheaper per square metre and stronger. This material earns its price on access, speed, seasonality and geometry — not on unit cost against an easy pour.

A rough-terrain forklift carrying a roll across an open construction site — **Ordinary plant handles it**No specialist equipment at either end. A forklift moves a roll; the same machine loads the container.

A roll standing upright on a wooden pallet on site ground, overhanging the pallet on both sides — **The unit you order**One roll: 80 to 120 m² and 840 to 1,200 kg. It overhangs a standard pallet, which is the clue that discharge needs lifting gear.

Four to six people, one shiftSheets laid transversely down a ditch. Long linear works sit at the top of the 400–1,200 m² range.

Illustration

The same profile, before and after lining.

A highway drainage channel graded into sand, and the same profile once it has been lined. The material protects a shape; it does not create one, which is why the earthworks are finished first and the lining follows every contour of them.

A drainage channel graded into bare sand beside a highway, with an older concrete slab revetment on the bank above it — **Before**Graded and unprotected. The bank above already carries an older slab revetment; the channel itself is bare sand, and sand at this angle does not hold a profile through a wet season.

The same channel lined with pale grey cement-fabric sheeting following every terrace and slope — **After**The identical profile, lined. Sheets follow every terrace and side slope, and the seam lines bend where the ground bends — nothing is rebuilt, only covered.

Rendered illustration, not photographs of a specific job. Documented reference installations are listed under Applications.

Straight answer

What it is not, said before you find out.

This is a protective and lining material. Most disappointment with it comes from a buyer who specified it as a structural one, and we would rather lose the enquiry than take that order.

It is not a load-bearing element: Minimum 28-day flexural strength is 4.0 MPa. That is an armouring number, not a structural one. It is not a pavement, not a slab, not a foundation, and it does not carry traffic. Where it is laid on a road or a hardstanding it is a surface protection layer over something else that is carrying the load.
It does not bridge a void: It is flexible, so it follows the subgrade — including the subgrade's faults. If the ground beneath is settling, scouring or voided, the material will settle with it. Ground that needs fixing still needs fixing; this is the layer that stops the fixed ground being taken away again.
It is a warm-weather installation: Hydration and cure are recommended above 0 °C. Concrete slabs and flat gabions are year-round in a way this is not, and on a winter programme in a freezing climate that is a scheduling constraint, not a footnote. Cured material is rated to F200 at 5 mm and F300 at 8 and 11 mm for freeze-thaw cycles — the limit is on installing it, not on it surviving winter afterwards.
Surface preparation is reduced, not abolished: The manufacturer's position is that preparation is required "only when appropriate", and on a rough natural slope that is fair. On a face with sharp protrusions, standing organic material or loose spoil, preparation is still appropriate. We will say which one we think you have.
The design life figures need pinning down: The published material gives 5 to 25 years depending on operating conditions in one document and more than 50 years in erosion-control duty in another. Those are not the same claim. We ask the manufacturer for the design-life basis in writing against your specific exposure — flow velocity, abrasion, chemical contact, UV — before it goes into a contract, and we quote the number they will stand behind rather than the number in the brochure.
It is low-hazard, not no-hazard: The material is not assigned a hazard class and is not classified as an irritant, and because nothing is mixed on site there is no mixing dust. It is still cement. Masks, gloves and protective clothing during handling and cutting, same as any cementitious product.

Specification

The rated values, and what each one governs.

Values are the manufacturer's rated figures for the standard product. Anything you intend to design against, we will have confirmed in writing against the production lot before it ships.

Parameter	Unit	Rated value	What it governs
Dry (unhydrated) thickness	mm	5 · 8 · 11	The three standard products. Thickness is selected against expected flow velocity and abrasion, not against area.
Dry density, min.	kg/m³	1,500	Cement content per unit area — and, with thickness, the roll weight you have to lift.
Matured density, min.	kg/m³	1,700	The cured section. The gain over dry density is the hydration water taken up.
Initial setting time at +20 °C, min.	minutes	60	The working window. One hour is the floor; one to two hours is the practical range in which a hydrated sheet can still be adjusted.
Flexural strength, 3 days at +20 °C	MPa	3.0	Early strength at natural moisture content — when the surface can take foot traffic and light works.
Flexural strength, 28 days air-dry	MPa	4.0	The design figure. See what it is not before designing against it.
Frost resistance	freeze-thaw cycles	F200 (5 mm) · F300 (8 and 11 mm)	Durability in a freezing climate once cured. Distinct from the installation temperature limit.
Water resistance	24 h	Pass	Confirms the cured section is not degraded by continuous immersion — the condition most of its applications put it in.
Root resistance	DD CEN/TS 14416	Pass	Root penetration. The reason this works as long-term weed suppression where maintenance access is poor.
Weather resistance	BS EN 12467	Pass	The fibre-cement sheet durability standard — soak-dry, warm water and freeze-thaw conditioning.
CO₂ reduction vs cast in situ	%	55	Production-cycle basis. See carbon for what that figure does and does not include.

Two of these are European test standards and two are not comparable to anything. Root resistance to DD CEN/TS 14416 and weather resistance to BS EN 12467 are third-party testable and we will supply the reports. Abrasion resistance is quoted by the manufacturer as up to five times conventional concrete, and chemical resistance as high — both without a named test method. We treat those as marketing until a method and a report are attached, and we will tell you so rather than repeat them into your specification.

Roll formats

Three thicknesses, one width, and a container arithmetic that decides the order.

All three products are one metre wide. Thickness sets the length on the roll, the coverage, the weight and how many fit in a box — so the ordering unit is really the container, not the roll.

Product	Thickness	Width	Length	Coverage	Roll weight	Rolls / 40 ft	Coverage / 40 ft
5 mm	5 mm	1 m	120 m	120 m²	840 kg	20	2,400 m²
8 mm	8 mm	1 m	100 m	100 m²	1,100 kg	20	2,000 m²
11 mm	11 mm	1 m	80 m	80 m²	1,200 kg	16	1,280 m²

Read the last column before the first. Going from 5 mm to 11 mm nearly halves the area a container delivers and roughly doubles the freight per square metre. On a specification that is genuinely borderline between two thicknesses, the landed cost difference is mostly freight, and it is worth resolving on hydraulics rather than on caution. A one-tonne-plus roll also needs lifting equipment at the receiving end — a point that is easy to leave out of a remote-site plan. Material ships from European production, which keeps lead times into Europe, the Mediterranean and West Africa short and takes the origin question off the table before it is asked.

Installation

Six steps, and the two that go wrong are the fixing and the water.

The sequence below is the manufacturer's. We include it because the commercial case rests on it being this short — and because the failure modes are all in steps three and five.

01 — Prepare the surfaceWhere appropriate. The sheet is flexible enough to smooth out an uneven surface and fit tightly to irregularities, so full preparation is often unnecessary — but sharp protrusions, loose spoil and standing vegetation still come off first.

Two workers pulling a sheet of the material out over a prepared sand slope, a roll lying on the sand beside them — **02 — Roll out**Manually, or from a crossbar suspended from a crane for long runs and slope faces. Sheets are laid to overlap, because the overlap is the joint.

A worker driving a steel anchor through the laid sheet with a hand tool — **03 — Fix to the substrate**Conventional anchors or capped steel spears into ground; screws, taptites or expanding anchors into concrete. On slopes and channel linings the sheet is terminated into an anchor trench at the crest — the single detail that decides whether an installation survives its first storm.

A worker running a screw gun along the overlap between two sheets — **04 — Join the sheets**On a 10 cm overlap, using bolts, self-tapping screws, adhesive sealant or mortar, singly or in combination. On hydraulic work the joint detail is chosen against flow direction — sheets are lapped downstream, not upstream.

A worker spraying water along a roadside ditch lined with the material during hydration — **05 — Hydrate**Spray, unpressurised, or immerse. Fresh or sea water. Pressure is the mistake to avoid: a jet displaces cement out of the fabric before it can set, and the thin patch it leaves does not recover.

A finished roadside ditch lining, dry and cured, with leaves collected in the invert — **06 — Cure**Hardening starts within one to two hours; the sheet is still workable during that window. Complete cure is 24 to 48 hours depending on weather. Three days at +20 °C for early flexural strength, 28 days for the design figure.

Steps 01, 02 and 06 are rendered illustrations; the rest are photographs of the work.

Detail of the 100 mm lap between two sheets with mechanical fixings — **The lap**100 mm overlap, fixed mechanically or chemically. On hydraulic work sheets are lapped downstream, not upstream.

Section through a protected slope showing the crest anchor trench and ground anchors — **The crest**The anchor trench at the top of a slope is what holds the whole face. Installations fail at the top edge, not in the middle of the sheet.

Resources on site. Crane with suspended traverse where rolls are placed rather than pushed; steel anchors and metal screws; water. Hand tools: sledgehammer, circular saw or sharp knife, screwdriver, hose with a spray nozzle. Fastener types supplied against the substrate — screws 8–40 mm, expanding anchors 8–24 mm diameter in 75–260 mm lengths, and J- and U-profile ground anchors. Installation regulations and standard construction details are released with the order.

Illustration

What a lined channel actually looks like.

The same section before and after lining. Sheets go across the channel rather than along it, so every joint runs down the fall and each one is a 100 mm lap — which is why a finished channel reads as a row of chevrons.

A V-shaped drainage channel freshly cut and graded in sandy ground, unlined — **Graded, unlined**Bucket marks down the faces and the first rain rills already cutting into the invert. Sand at this angle does not hold a profile through a wet season.

The same channel lined with cement-fabric sheets laid across the section, forming a chevron of lap lines down its length — **Lined**Sheets laid across the section and anchored at both crests. Every dark line is a lap, one sheet overlapping the next, the whole length of the channel.

Rendered illustration, not a photograph of a project. Documented reference installations are listed under Applications.

Applications

Two functions, and everything else is a variation on them.

Erosion protection and slope stabilisation. Once you read the list that way, the standard details stop looking like fifteen products and start looking like one.

Application	What it is doing
Slope protection	Armouring an embankment or cut face against strong water flow, drought cracking and poor soil condition. The highest-volume use, and the one the anchor trench detail exists for.
Channel and ditch lining	Riverbanks, canals, roadside drainage ditches and spillway trays — protecting the profile against water and wind erosion while keeping the section's hydraulic shape.
Bank protection	Rigid armour around the perimeter of petrochemical tank farms, and around bunds and lagoons where the embankment is the containment.
Water storage and containment	Lining reservoirs, ponds and lagoons as an alternative to conventional concrete drains where containment is the requirement. The geotextile face is what keeps the stored medium off the soil.
Concrete repair and resurfacing	Restoring cracked or damaged existing concrete — flumes, aprons, spillways, bridge cones, culvert heads — without demolition. Frequently the fastest route back into service, because the existing structure stays where it is.
Culvert and pipeline lining	Steel and concrete culverts that have deteriorated through erosion and corrosion, relined from the inside rather than replaced.
Gabion protection	Covering gabion walls in trench reinforcement so the baskets are not corroded away in flood conditions.
Weed and root suppression	A permanent surface at sites where maintenance access is difficult or expensive — substations, tank farms, trackside, remote plant. Root resistance is tested to DD CEN/TS 14416.
Mining ventilation walls	Permanent and temporary underground ventilation structures and explosion-proofing, in place of fabric ventilation shields, cinderblock or drywall.
Oil well works	Ground protection during construction and workover, where the geotextile-faced section is there to keep spillage off the soil.
Roof waterproofing and insulation	Residential and industrial roofs and main pipelines, against humidity and leakage.
Architectural work	The material has been used for exhibited sculptural and public-art pieces. Worth knowing it can be; not a reason to buy it.

Channel liningSheets laid across the section, anchored at both crests, lapped downstream.

Section through a protected bank showing the sheet returned over the crest and carried below the water line — **Bank protection**Returned over the crest and carried below the design water level.

Section showing the material laid over an existing cracked slab and fixed with anchors — **Resurfacing**Over a cracked slab that stays where it is. No demolition, no removal.

Section through a culvert barrel relined on the inside — **Culvert relining**Bonded inside an existing barrel lost to erosion and corrosion.

A crew laying cement-fabric sheets up the face of a bridge abutment cone, old cracked concrete visible below — **Slope protection**Sheets laid straight up the face of a bridge cone, over the cracked concrete already there. The crest termination is what holds the whole slope.

A trapezoidal drainage channel graded into sandy ground, setting-out pins along both crests and the first sheets laid at the near end — **Channel lining**The graded section with setting-out pins at both crests and the first sheets going down. The lining takes the profile the earthworks were cut to; the ground anchors that fix it are in the foreground.

A water storage lagoon fully lined and filled — **Water storage**Lagoon lining. Limited alkaline content is what permits placement into live water.

A culvert headwall and its approach slopes faced with the lining, mown grass either side — **Culvert and headwall**A culvert head and its approach slopes, resurfaced rather than rebuilt. The existing structure stays where it is and the lining is taken over it.

Pipework and valves on a petrochemical site standing on a continuous lined surface — **Petrochemical ground**Separation-site ground protection. The geotextile face keeps spillage off the soil.

Long bund ridges around a storage tank under construction, covered continuously — **Tank farm bunding**Bund and perimeter armouring at a storage installation — long linear runs, minimal plant.

Slope protection is a rendered illustration; the other five are photographs of the work.

Sectors it is bought by

Railways, road construction, petrochemical, coal and mining, water utilities and water bodies, infrastructure works, housing and public utilities, and agriculture.

Thickness against duty

Selected on maximum expected flow rate and abrasion exposure, not on area. Spillways and high-velocity channels drive it up; weed suppression and low-flow ditch lining do not.

Reference installations

Published references for this material include highway slope protection for a UAE roads authority and a 5,000 m² highway-exit erosion works for a UAE municipality, reported still in original profile four years after placement. These are the manufacturer's projects rather than ours, and we present them as such.

Carbon and site safety

The carbon case is real, and it is mostly an arithmetic about material volume.

Cement is one of the largest single industrial sources of CO₂ — over 4.1 billion tonnes produced in 2020, for around 1.5 billion tonnes of CO₂. Anything that does the same job with less cement is a carbon story before it is anything else.

The claim here is up to 95 % less material than a conventional solution, and a production-cycle figure of 55 % lower CO₂. Stated the other way round: one square metre of this material used for channel lining carries about 45 % of the CO₂ of the equivalent square metre of cast-in-place concrete. The mechanism is not a novel binder — it is ordinary cement, used in a section a few millimetres thick instead of a section a few hundred millimetres thick.

Transport is the second half. One roll displacing two 17-tonne mixer loads is roughly a 50 % cut in transport emissions on remote works, and the faster installation cuts plant hours on site. We would treat the 55 % as the manufacturer's production-cycle figure rather than a verified cradle-to-grave number, and we say so when it is being used in a tender.

Two environmental properties are worth more than the headline. The cement used has limited alkaline content, so the material can be installed directly into live water sources without the pH excursion a fresh conventional pour causes — and the cured mix is not washed out by groundwater. Second, the geotextile facing gives the soil a continuous barrier against industrial contamination, which is why the tank-farm and well-pad applications exist at all. Local consent for works in a watercourse is still a matter for the destination regulator, and we do not represent otherwise.

On site safety the argument is simply exposure time. Nothing is batched, so no mixing dust is generated; installation is around ten times faster, so workers spend proportionally less time in contact with cement at all. The material is not assigned a hazard class and is not classified as an irritant. Standard PPE still applies — see what it is not.

Scope

Where our obligation ends.

What we supply: The material, by the roll and by the container, against a defined scope of works. Thickness selection, quantity take-off from your drawings, standard construction details, installation regulations and the fastener schedule for your substrate.
What we do not do: We do not manufacture. We do not install, we do not supervise installation, and we do not carry the works. We are not the designer of record: we will tell you what the material can and cannot do, but the design of your slope, channel or containment structure is yours or your engineer's.
Design values: Rated values are the manufacturer's. Where a figure is going into a design or a tender we obtain written confirmation against the production lot, and we will not carry an unsourced performance claim into a specification — including the abrasion and chemical-resistance claims, which have no stated test method.
Certification: Product technical specification and declaration of performance, ISO 9001:2015 quality-management certification for the producing facility, and patent documentation issued through Belgian and European attorneys. Test reports for DD CEN/TS 14416 root resistance and BS EN 12467 weather resistance on request. Any further destination-market certification — fire classification, contact with potable water, environmental declaration — is confirmed for the specific facility and grade before order rather than assumed from a type approval.
Origin: Supplied from European production — two manufacturing facilities within Europe. Certificate of origin issued per consignment, with origin and chain of title confirmed to the buyer before order. We do not source this material from any other origin, and we do not offer it against one — see Compliance.
Carriage: Not a dangerous good. Ordinary containerised or truck cargo, palletised, on a per-container basis. Lifting equipment at the discharge point is the buyer's arrangement — the rolls run from 840 to 1,200 kg.

How to specify

Six lines and we can price it.

The first two are the ones that decide whether this is the right material at all. Send those and we will tell you honestly if it is not.

Duty

What the surface has to resist — flow velocity, abrasion, chemical contact, root pressure, traffic. If the answer includes traffic loading, say so first.

Geometry and substrate

Slope angle, channel section, area, and what the material is being fixed to: soil, rock, existing concrete, steel. The substrate sets the fastener schedule.

Thickness, or the data to choose it

5, 8 or 11 mm if it is already specified. If it is not, send the hydraulics and we will propose one and show the working.

Area and programme

Square metres, phasing, and the installation window — because the above-zero installation limit can be the constraint the programme actually has to be built around.

Destination and delivery basis

Port or site, FOB, CFR or DAP, and whether lifting equipment is available at discharge for a roll over a tonne.

Documentation required

Which certificates and test reports your project or your engineer needs to see, and whether any figure has to be third-party verified. Ask before the order, not during the submittal.

Inspection

A manufactured product, inspected as a manufactured product.

This is not a bulk cargo where an assay decides the invoice. It is a factory-made roll good, and the questions are the ones you would ask of any of them: does the lot match the type, is it intact, and is what arrived what was tested.

Lot documentation: Production lot and roll numbers tied to the delivery, with the manufacturer's test certificate for the lot covering thickness, dry density and setting time. A generic type certificate with no lot reference is not a lot certificate, and we do not pass one off as one.
Type testing: Flexural strength at 3 and 28 days, matured density, frost resistance, water resistance, root resistance to DD CEN/TS 14416 and weather resistance to BS EN 12467 — reports supplied with the first order and on any change of production specification.
Pre-shipment inspection: Where the buyer requires it, an agency appointed for the consignment — SGS, Bureau Veritas or Intertek — instructed jointly, verifying quantity, roll dimensions and weights, marking, packing integrity and container condition against the lot documentation.
Condition on arrival: The one that matters most in practice. This is a dry cementitious product wrapped for transit: a roll that has taken water in transit or in an open yard is compromised whether or not it looks it. Packing integrity is checked and photographed at loading and again at discharge, and rolls are stored dry, off the ground and under cover until they go down.
Site verification: Where a project requires it, sample sections hydrated and cured on site and tested for flexural strength at 28 days against the rated value. Arranged before the works start, not after a dispute.
Documentation per shipment: Lot test certificate, ISO 9001 certification, ecological, fire and hygienic certificates, product technical specification, installation regulations and standard construction details, packing list with roll numbers and weights, certificate of origin, bill of lading and the inspection report where one is appointed.

Straight answer

What we will tell you before you ask.

That it is not concrete in the sense your engineer means: Four megapascals in flexure. It armours, lines and resurfaces. Anyone selling it to you as a slab replacement is selling you a claim the specification does not support.
That the anchor trench is the installation: On a slope or a channel, the crest termination is what holds the whole face. Installations fail at the top edge, not in the middle of the sheet.
That pressure washing it during hydration ruins it: The mix is a powder held in a fabric until it sets. A pressure jet moves it. Spray unpressurised, or immerse.
That two of the performance claims have no test method: Five times the abrasion resistance of conventional concrete, and high chemical resistance. Both may well be true; neither comes with a named standard. We will not write them into your specification and we would query anyone who does.
That the design life needs to be pinned to your exposure: The published range runs from 5–25 years to more than 50 depending on which document you read. We get the basis in writing for your duty before it goes into a contract.
That freight is a bigger part of the decision than it looks: A 40-foot container carries 2,400 m² at 5 mm and 1,280 m² at 11 mm. Over-specifying thickness costs you twice.

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