A single layer of carbon, inside the world's most-used material.
Graphene is one atom thick and extraordinarily strong. Concrete is strong but brittle. This guide explains, in plain language, what happens when you put the first into the second, what the tests show, and what is still unproven.
What graphene is
Pencil lead is graphite: millions of flat sheets of carbon stacked loosely like pages. Peel off a single page and you have graphene, a sheet of carbon atoms joined in a honeycomb pattern, about a third of a nanometre thick.
It was first isolated at the University of Manchester in 2004, famously by pulling layers off graphite with sticky tape, and the work won the 2010 Nobel Prize in Physics. In pristine, defect-free form it is one of the strongest materials ever measured, and it also conducts heat and electricity well.
For concrete, three properties matter most: its strength, its enormous surface area (a gram of single-layer graphene has more surface than a tennis court), and the fact that its surface can be chemically adjusted so that cement bonds to it.
Each corner of the honeycomb is a carbon atom. Graphite is many such layers stacked; graphene is one.
~0.34 nmThickness of one layer, about 100,000 times thinner than a hair.
~130 GPaMeasured tensile strength of pristine graphene, on the order of 100 times that of structural steel.
100–300 ppmThe dose tested below: 0.01–0.03% of the cement's weight. A tiny amount.
From a bridge to a single atom
Concrete fails from the inside, at scales far too small to see. Step down through five levels to find where graphene actually works.
Schematic, not to scale between levels. Each level magnifies the outlined square in the one before.
The structure
A concrete pier looks solid, but in the splash zone it is wetted, dried and salted thousands of times a year. Damage starts at the surface and works inward along cracks you cannot see from the shore.
Why concrete cracks
Concrete is cement paste glued around sand and stones. It resists squeezing very well but pulls apart easily, roughly ten times more easily, so it develops hairline cracks as it dries, heats, cools and carries load. Water, salts and carbon dioxide then travel through those cracks and pores, corroding the steel bars inside. Rust takes up more space than steel, so it splits the concrete from within. That is the main way concrete structures age.
The usual decay sequence. Slowing the first two steps slows everything after them.
Scale makes it matter: the world uses about 30 billion tonnes of concrete a year, which is more than any other made material and second only to water overall. Making cement accounts for an estimated 8–9% of global CO₂ emissions, and concrete production draws roughly 18% of the water used by industry.
A concrete that lasts longer, or achieves the same strength with less cement, is therefore an environmental question as well as an engineering one. Every extra decade of service life is a structure that does not have to be rebuilt.
What graphene could do inside the mix
Cracks start at a scale far smaller than the eye can see. Graphene flakes are small enough to work at that scale. Switch the view to compare.
Ordinary concrete: a microcrack opens easily and runs through the paste, giving water and salts a path to the steel.
It gives cement a place to grow
Cement hardens as crystals form in water. Graphene surfaces, especially graphene oxide, can act as seeds for these crystals, which may produce a denser, more uniform structure.
It bridges and deflects cracks
A flake lying across a hairline crack resists it opening and can force it to take a longer path. The cracking becomes slower and less direct.
It fills and refines pores
Flakes and the tighter structure around them can make the paste less porous, so water and chlorides move through it more slowly. That also matters for alkali–silica reaction, a moisture-driven swelling that cracks concrete from within.
What lab studies report: gains in compressive and bending strength from a few percent up to about 35%, and lower water or chloride penetration. Some studies find little or no benefit. The size of the effect depends strongly on how well the graphene is mixed in.
Not all graphene is the same
Materials sold as "graphene" for concrete differ a great deal. The name on the bag says little, so the form matters.
Form
What it is
Behaviour in a mix
Pristine graphene
One or a few clean carbon layers
Strongest, but water-repelling, so it clumps and is hard to disperse.
Graphene oxide (GO)
Layers decorated with oxygen groups
Mixes into water easily and bonds with cement, but is sensitive to the calcium-rich pore solution.
Graphene nanoplatelets (GNP)
Thicker stacks of a few to tens of layers
Cheaper and more available; less dramatic, still useful at low dose.
Hydrophilic multi-layer graphene
A few layers, produced so that it wets and spreads in water
The type used in the test programme below; designed to avoid the clumping problem.
Questions worth asking a supplier
How many layers are typical, and how was that measured? What is the flake size? Is it supplied as dry powder or as a ready-dispersed liquid? Which test results come from independent laboratories, and at what dose and water-to-cement ratio? A credible supplier will answer all of these with data.
How it gets into the mix
The dose is tiny, so the hard part is spreading a few grams evenly through a cubic metre. A typical laboratory sequence looks like this.
Weigh the dose against the cement
Dose is set as a fraction of cement weight, not of the whole concrete. At 200 ppm and 350 kg of cement per cubic metre, that is 70 grams.
Disperse it in part of the mixing water
The graphene is stirred into water together with the superplasticizer, which coats the flakes and keeps them apart. Labs often use ultrasound or a high-shear mixer at this stage.
Check that it stays dispersed
A good dispersion looks evenly grey and does not settle out quickly. Clumps visible to the eye mean the flakes will act as weak spots rather than reinforcement.
Batch the concrete as usual
The dispersion replaces part of the mixing water. Cement, sand and stone are added in the normal order, so plant equipment does not need to change.
Cure and test against a control
Every batch is cast alongside identical specimens without graphene. Only the difference between the two says anything about the additive.
Inside a real test programme
Theory is one thing; broken concrete is another. These photographs come from a three-year laboratory programme that cast and tested more than 1,500 specimens of concrete and mortar, with and without a multi-layer graphene added.
Casting. Prisms and cubes are labelled, and control specimens with no graphene are cast alongside.Bending (flexural) test: a prism is loaded until it cracks.Sensors record how far the beam deflects as the load rises.Compression test: cubes are crushed to find the load they carry.Prisms after bending tests. Researchers compare the load at failure and the crack pattern between control and graphene mixes.
What was varied
Graphene dose
0 (control), 100, 200 and 300 ppm of cement weight
Water-to-cement ratio
0.35, 0.40 and 0.45
Superplasticizer (water reducer)
0, 1.5, 2.5 and 3.5% of cement weight
Age at testing
7, 28 and 56 days, cured in water at 25 °C
Specimens
Prisms 40×40×160 mm, cubes 150 mm, cylinders 150×300 mm; cement content 350 kg/m³
Those four variables multiply quickly: 4 doses × 3 water ratios × 4 superplasticizer levels × 3 ages gives 144 combinations, each needing several repeat specimens to average out scatter. That is how a programme reaches more than 1,500 breaks.
up to 35%Higher compressive strength than control specimens.
up to 25%Higher flexural (bending) strength.
1.5%Superplasticizer dose that gave the best results. Higher doses reversed the benefit.
Two lessons stand out. Water-to-cement ratios of 0.35 and 0.40 performed somewhat better than 0.45. And all three graphene doses gave consistent gains, so more flakes were not required. Mix design still matters as much as the additive: the wrong amount of superplasticizer cancelled the effect.
How to read results like these
"Up to" means the best combination, not the average. Look for the gain at the mix you would actually use, the number of specimens behind each figure, and whether the control and graphene specimens were cast from the same batch of cement on the same day.
Work out a dose
Move the sliders to see how much graphene a pour would need, and what the carbon saving could be if stronger concrete allowed less cement.
Estimates only. The cement saved uses the cement content and volume from the left-hand panel, and ignores the carbon footprint of producing the graphene itself, which varies by manufacturer.
Where it could matter most
Graphene adds the most value where concrete fails by letting water in rather than by being too weak. These are the applications researchers and suppliers most often point to.
Coastal and marine structures
Piers, sea walls and harbour works sit in salt spray. Lower chloride penetration would directly slow steel corrosion.
Bridge decks and pavements
Constant traffic, de-icing salts and temperature cycles open fine cracks. Better crack resistance could extend resurfacing intervals.
Industrial floors and slabs
Floors are large, thin and shrink as they dry. Early graphene trials were floor slabs, partly because they are easy to monitor.
Precast elements
Factory production controls mixing and curing tightly, which is exactly what reliable dispersion needs.
Repair mortars
Small volumes, high value per kilogram, and a need for strong bonding to old concrete make the cost easier to justify.
Water-retaining structures
Tanks, pipes and reservoirs depend on low permeability more than on raw strength.
What is still unresolved
Dispersion. Flakes cling to each other. If they clump, they stop helping and can even create weak spots. Good results usually need ultrasound, special admixtures or surface treatment.
Long-term evidence. Most results come from small samples tested weeks or months after casting. Decades of weathering, freeze-thaw and loading are not yet well documented.
Standards. There is no common definition of "graphene" or test protocol for concrete, which makes studies hard to compare.
Cost and scale. The dose is tiny, but quality graphene is still expensive, and the added value has to outweigh the cost in each real application.
Independent proof. The programme above was run by the team that makes the material. The next step for any result like this is repeat testing by an independent laboratory, followed by trials at project scale.
Knock-on claims. Faster curing, less cement, lighter structures and an estimated saving of 10–15 kg of CO₂ per tonne of concrete follow logically from higher strength, but they have yet to be demonstrated in real projects.
Two centuries in brief
Modern concrete and graphene are separated by almost two hundred years, and only met in the last decade.
Portland cement is patented. Joseph Aspdin, a bricklayer in Leeds, patents the cement that still forms the basis of nearly all concrete.
Steel goes inside. Joseph Monier patents reinforced concrete, combining concrete's strength in compression with steel's strength in tension, and creating the corrosion problem described above.
Graphene is isolated. Andre Geim and Konstantin Novoselov at the University of Manchester peel single layers from graphite.
Its strength is measured. Nano-indentation experiments put the strength of pristine graphene at about 130 GPa.
Nobel Prize in Physics is awarded to Geim and Novoselov.
Graphene-concrete studies multiply. Researchers at the University of Exeter publish a widely reported study of concrete made with graphene suspended in water, claiming large gains in strength and water resistance.
First commercial pours. A graphene-enhanced concrete slab is poured for a building in Amesbury, England, in a project linked to the University of Manchester.
Standards and long-term data. Agreed test methods, independent replication and decades-long monitoring are what will decide whether graphene becomes routine.
Common questions
Does graphene make concrete conduct electricity?
Not at the doses discussed here. Making concrete conductive, for self-heating pavements or built-in strain sensing, needs far higher loadings so that flakes touch each other in a continuous network. That is a separate line of research.
Is it safe to handle?
Like any fine powder, dry graphene should not be breathed in, and suppliers specify dust control and protective equipment. Supplying it as a liquid dispersion largely avoids airborne dust. Once bound into hardened concrete the flakes are locked in the paste, though release during later cutting or demolition is still being studied.
How much does it add to the cost?
It depends on the grade and supplier, and prices have been falling. Because the dose is measured in grams per cubic metre, the material cost per cubic metre can be modest. The real question is whether strength or durability gains let a project use less cement, thinner sections, or fewer repairs.
Can it replace steel reinforcement?
No. Flakes work at the scale of microcracks. They can improve the concrete around steel bars, and may slow corrosion, but they do not carry the tension that reinforcement carries in a beam or slab.
Is graphene oxide better than graphene?
Each has trade-offs. Graphene oxide disperses more easily and bonds well with cement, but reacts with calcium in the fresh paste and is less strong itself. Many recent products aim for a middle ground: few-layer graphene treated to disperse in water.
Can I use it on my own building project?
Graphene-enhanced admixtures are sold commercially in some markets. Any structural use should go through a qualified engineer and local building codes, and trial mixes should be tested against a control using your own cement and aggregates.
Glossary
Compressive strength
The squeezing load concrete carries before crushing, usually tested on cubes or cylinders.
Flexural strength
Resistance to bending. Concrete is much weaker in bending than in compression.
Hydration
The chemical reaction between cement and water that makes concrete harden.
C-S-H gel
Calcium silicate hydrate, the main product of hydration and the "glue" that gives concrete its strength.
Water-to-cement ratio
Weight of water divided by weight of cement. Lower ratios give stronger, less porous concrete but are harder to mix.
Superplasticizer
An admixture that makes concrete flow with less water. It also helps keep graphene flakes apart.
Chloride penetration
How quickly salt moves into concrete. The main cause of steel corrosion near the sea and on salted roads.
ppm
Parts per million. 100 ppm of cement weight is 0.01%, or 1 gram per 10 kg of cement.
Further reading
Novoselov, K. S. et al. (2004). Electric field effect in atomically thin carbon films. Science 306, 666–669.
Lee, C. et al. (2008). Measurement of the elastic properties and intrinsic strength of monolayer graphene. Science 321, 385–388.
Dimov, D. et al. (2018). Ultrahigh performance nanoengineered graphene–concrete composites for multifunctional applications. Advanced Functional Materials 28, 1705183.
The Nobel Prize in Physics 2010, press release and scientific background, Royal Swedish Academy of Sciences.
Who we are
Yazal Co. works to bring graphene-enhanced cement and concrete from the laboratory to real construction, starting in Egypt and Sudan.
1
Research and development
Together with academic partners, we study how graphene can improve cement and concrete made with local materials and in local conditions in Egypt, Sudan and Canada. Results depend on the cement, aggregates and climate, so testing has to happen where the concrete will be used.
2
Supply and distribution
We market, sell and distribute graphene for cement and concrete in Egypt and Sudan, with North America to follow.
EgyptHeadquarters
SudanSubsidiary
CanadaSubsidiary, North American market
A note on independence: we sell graphene, so we have an interest in good results. That is why this site sets out the limits alongside the gains, and why we treat independent testing as the standard any claim has to meet.
Talk to us
For research collaboration, trial mixes, technical data or supply enquiries, send us an email.
