How Runway Spalling Becomes FOD — and How to Stop It

How Runway Spalling Becomes FOD — and How to Stop It

FOD does not always blow in from off the field. Sometimes the runway generates it.

Concrete spalling is one of the leading pavement sources of foreign object debris. A spall starts as a small defect at a joint or crack. Under load, it breaks free. Now there is a loose fragment on the movement area — and that fragment is a hazard to every aircraft that follows.

For airport ops directors, airfield managers, and safety officers, this is not a cosmetic concern. It is a FOD problem with a pavement source. And a pavement source can be controlled.

What FOD Is and Why It Matters

FOD stands for Foreign Object Debris. It is any object — natural or man-made — that ends up on an airport movement area where it does not belong. Loose concrete, rock, hardware, tire fragments, tool parts. If it can damage an aircraft, injure personnel, or disrupt operations, it is FOD.

The risk is direct. A fragment ingested by a turbine engine can destroy it. Debris on the runway can cut or blow a tire during takeoff. Loose objects near ground crews are a personnel hazard. And any of these events can shut down a runway when you can least afford it.

FOD is an operational and safety liability. Every airfield safety program treats it that way.

Spalling as a Pavement Source of FOD

FOD gets a lot of attention as something crews find and clear. Less attention goes to where it comes from. A large share comes from the pavement itself.

When concrete fragments break free at joints, cracks, and corners, they become loose objects on the runway or taxiway. That is spalling turning into FOD in real time. It is one of the primary pavement-related sources.

Spalling is not alone. Other pavement distress generates debris too:

• Cracking — edges break down and shed material
• Raveling — aggregate works loose from the surface
• Scaling — the surface layer flakes away
• Joint damage — deteriorated joints release fragments
• Patching failures — old repairs break apart and become debris themselves

There is also a leading indicator worth tracking. A declining surface friction trend can signal that the pavement is degrading in ways that generate FOD. Friction data is not just a braking metric. It is an early warning.

For a deeper look at what drives this specific distress, see our breakdown of spalling on runways — causes and repair.

Why the Problem Compounds

A spall does not stay small. It compounds.

The cycle is simple. Spall becomes FOD. FOD causes more damage — to aircraft, and to the pavement around the original defect. That damage creates more spalling. The loop feeds itself.

Water accelerates it. Infiltration at joints and cracks drives joint spalling and edge raveling. Freeze-thaw expands the water, pries the concrete apart, and widens the defect. Aircraft loads finish the job. A minor spall you could have addressed in one short window becomes a large one that threatens operations.

Time is not neutral here. Every day a spall sits untouched, it gets more expensive and more dangerous to fix.

Prevention: Stop the Pavement From Making Debris

The most effective FOD strategy is not faster sweeping. It is keeping the pavement from generating debris in the first place.

That means preventive maintenance done on a schedule, not in response to a crisis:

• Crack sealing to block the water infiltration that accelerates joint spalling and edge raveling
• Routine inspection that catches distress early, including friction trend monitoring
• Rapid repair of spalls before they spread and shed fragments

This is consistent with FAA guidance. Advisory Circular AC 150/5210-24, Airport Foreign Object Debris (FOD) Management, addresses managing FOD across the airfield — and controlling the pavement condition is central to reducing what the surface produces.

Sweeping and inspection matter. But they treat the symptom. Preventive maintenance treats the source.

Where Rapid Spall Repair Fits

There is a practical problem with repairing spalls: the runway is in use. Crews get short windows, not long closures. Traditional concrete repair needs days to cure, so spalls wait — and while they wait, they become FOD.

A fast return-to-service material changes the equation. It lets crews fix spalls during the windows they actually have, before a defect turns into debris.

That is what SpallKRETE is built for. It is a three-component thermoset vinyl polymer that gets pavement back in service in as little as 1 to 2 hours. It mixes in under five minutes. It is a simple mix-and-pour application — no specialized crews required. It performs from −40°F to 120°F, desert to arctic. It reaches a compressive strength of 11,412 PSI and bonds tenaciously to the surrounding concrete.

SpallKRETE meets or exceeds MIL-STD and FAA requirements for runway repair materials.

The operational point is straightforward. When repair fits inside a maintenance window, spalls get fixed early — before they spread, before they generate FOD, and before they force a closure. For more on protecting your operating schedule, see how to minimize runway downtime.

Frequently Asked Questions

Is spalling a source of FOD?

Yes. Spalling is one of the primary pavement-related sources of FOD. When concrete fragments break free at joints, cracks, and corners, they become loose objects on the runway or taxiway — foreign object debris that can damage aircraft and disrupt operations.

What causes runway FOD?

FOD comes from many sources, including the pavement itself. Pavement distress that generates debris includes spalling, cracking, raveling, scaling, joint damage, and failed patches. Water infiltration and freeze-thaw accelerate joint spalling, and a declining surface friction trend can indicate FOD-generating degradation.

How do you prevent pavement FOD?

The most effective approach is keeping the pavement from producing debris in the first place. That means preventive maintenance: crack sealing to stop water infiltration, routine inspection and friction monitoring, and rapid repair of spalls before they spread. This aligns with FAA AC 150/5210-24, Airport FOD Management.

Why repair spalls quickly instead of waiting?

Because spalls compound. A small spall becomes FOD, causes more damage, and grows under aircraft loads and freeze-thaw. Rapid-set repair lets crews fix defects during short maintenance windows — closing the FOD source before it spreads.

Control the Source

You cannot stop every object from reaching the airfield. But you can stop your own pavement from generating FOD. That starts with fixing spalls fast, before they break free.

SpallKRETE gives crews a repair that fits the windows they actually have. Back in service in 1 to 2 hours. Any climate. Meets or exceeds MIL-STD and FAA requirements.

Ready to spec a rapid runway repair material for your airfield? Start an RFP or contact adominguez@spallkrete.com.