When concrete starts healing itself

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This week we’re quoting…

Professor Kevin Paine (Department of Architecture & Civil Engineering, University of Bath)

What Paine said: 

“Our novel approach into smart materials could transform our infrastructure by embedding self-immunity and resilience so that structures can evolve over their lifespan. This will improve durability, serviceability, safety and reduce maintenance costs.”

To be clear…

Professor Paine did not say this to us. The quote comes from this outline of his team’s work, using bacteria to create spontaneous self-healing concrete. 

But when we read about self-healing concrete, we had to read more – because it’s a beautiful example of a material developed from the convergence of a host of different scientific and technological practices. 

Concrete has always been passive. It bears load and eventually it cracks – then we repair it. That’s the lifecycle. 

But self-healing concrete changes the premise. Instead of resisting damage (and eventually succumbing to it), it responds to damage. So that convergence of disciplines and technologies can create urban landscapes that are immune to the pressures of use, time, and weather. 

Biology meets cement chemistry 

The idea of using bacteria to seal cracks has been around for a while, but it’s only in the past few years that the research has matured into something that could be technically viable at scale.

A 2024 open-access review of bio-self-healing concrete outlines the core mechanism: specific bacterial strains can remain dormant inside concrete and, when exposed to water entering a crack, precipitate calcium carbonate (CaCO₃) – effectively growing limestone inside the fracture to seal it.

That sentence (yes, the one we just wrote) hides decades of discipline-crossing work.

Concrete is highly alkaline (pH 12–13). Most organisms can’t survive it. So researchers had to identify extremophile bacteria, typically Bacillus species, that can endure these conditions in spore form. Then they faced a second problem: the mixing process itself destroys delicate biological material.

This is where encapsulation engineering entered the story.

Another 2024 study on sustained-release carrier strategies explains how bacterial spores and nutrients must be immobilised or protected in microcapsules or lightweight aggregates to survive mixing and curing, and then activate only when cracks form. In other words, pharmaceutical-style delivery systems migrated into construction materials.

More recently, researchers are applying modelling and machine learning to optimise healing performance. A 2025 paper in Scientific Reports investigates the self-healing potential of Bacillus subtilis and uses modelling techniques to maximise efficiency and crack-sealing behaviour.

This is microbiology and materials science and computational modelling all coming together. Because self-healing concrete didn’t (couldn’t) emerge from a single breakthrough. 

From healing to sensing 

Now let’s layer in another field: structural health monitoring (SHM).

In 2024, a review in the journal Measurement examined self-sensing concrete sensors for bridge monitoring and explicitly discussed integration with IoT systems and digital twin technologies. These systems embed sensing capability directly into concrete structures, enabling real-time monitoring of strain, displacement and damage.

That means the infrastructure itself can report how it feels.

Alongside this, researchers are proposing IoT-enhanced SHM frameworks that combine low-cost sensors, cloud connectivity and digital twinning for cost-effective monitoring of civil assets. A 2025 paper in the Journal of Civil Structural Health Monitoring outlines such a framework, testing contact and non-contact displacement sensors in an IoT-connected system designed for practical deployment. 

Put these pieces together and you begin to see a new stack forming:

• Embedded sensing detects stress or microcracking
• Data flows through IoT networks
• A digital twin models behaviour in real time
• Self-healing mechanisms activate biologically

It’s the merging of two research trajectories that have been developing in parallel – and we think it’s kind of amazing. 

Smart cities beneath the surface 

When people talk about smart cities, they often focus on the obvious technological stuff – dashboards and apps, renewable grids, you know the drill. 

But beneath the software layer is physical infrastructure (think bridges and tunnels and the foundations of buildings) that determines resilience. 

One 2025 review assessing the technology readiness and application conditions of self-healing concrete highlights how suitability depends on environmental factors, including water exposure, temperature and pH – precisely the conditions faced by coastal and high-stress urban infrastructure. 

Meanwhile, digital twin frameworks integrating wireless sensor networks are being proposed specifically for ageing bridge resilience within smart city contexts. 

Putting all of this work together shows a clear trajectory. Smart infrastructure isn’t (and shouldn’t be) about gathering more data for the sake of…having more data. It’s about reducing intervention and extending the lifespan of structures and services; lowering lifecycle emissions; and making maintenance predictive instead of reactive. 

Self-healing materials reduce the need for external repairs. Sensor networks reduce uncertainty. And digital twins improve decision-making.

In climate terms, durability is decarbonisation. Every avoided repair cycle means less cement production, fewer emissions, and less operational disruption.

A pattern to take note of 

Self-healing concrete is part of a broader shift toward bio-integrated and responsive materials.

And what makes it really compelling for technologists is the systems thinking behind it. 

We’re witnessing: 

• Biology embedded into structural materials
• Software layered onto physical assets
• Data feedback loops operating at the material level

The material world is becoming programmable.

Concrete learning to heal itself sounds poetic. But it’s the outcome of disciplined collaboration across microbiology, civil engineering, computational modelling and IoT systems design.

And that’s an important reminder for anyone building at the edge of technology today: instead of just smarter software, the next frontier is smarter matter.

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Catch you next week,
The LEAP Team