Keeping people safe and operations running

Fast, precise re-levelling for sunken slabs

Pavement slab dropped needs re-levelling

The long term performance of infrastructure assets such as railways, roads, airports, harbours and buried utilities is greatly affected by the condition of the soil on which they are constructed. It is possible that soil conditions can deteriorate over time due to external forces such as water ingress which can wash out fines or due to the impact of clay shrink swell behaviour or due to excessive dynamic loading and vibration damage to name a few

The deterioration of soil conditions below concrete slabs manifests by the appearances of cracks, subsidence, uneven levels, tilting and rocking. These defects now affect the performance of the slab and can cause damage to vehicles, forklifts, aircraft and sensitive equipment and machinery. 

The slab pictured had settled due to the huge loads of HGVs.

Challenges of uneven sites

Weak soil at Baker Street site

Weakened soils

Existing soil conditions can deteriorate over time due to external forces such as water ingress which can wash out fines or due to the impact of clay shrink swell behaviour or due to excessive dynamic loading and vibration damage. As the soil becomes weaker, bearing capacity is lowered and excessive and uneven settlement increases.

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Operational disruption

Traditional civil engineering methods for dealing with even slabs normally entails excavation and replacement which is highly disruptive to operations as the area has to be cleared and cannot be used for an extended period of time. This level of disruption to operational schedules is often unacceptable.

Infra relevelling traffic jam socio economic

High socio-economic cost

The environmental impact of traditional engineering solutions is generally quite high due to the level of disruption and nuisance caused and a generally higher carbon footprint when compared to Geopolymer solutions.

CFS CO2 Assessed Org

High carbon emissions

Excavating and replacing concrete generates waste, transport impacts, and a heavy carbon footprint.

Solutions and benefits

Our solution is a faster, cleaner, and more precise way to restore sunken slabs.

1
Minimal disruption

Our no-dig process means operations can continue while we work.

2
Pinpoint accuracy

Laser monitoring ensures slabs are restored to the exact required level.

3
Faster completion

Projects finish in days, with resins curing in as little as 15 minutes.

4
Immediate return to service

Slabs can be safely used almost straight away.

5
Lower carbon footprint

Around 75% less carbon emitted than concrete replacement.

Specific applications

Our re-levelling and lifting solutions are used across a wide range of infrastructure assets:

Airport runways, taxiways, and aprons

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Port facilities and crane rail foundations

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Industrial and commercial warehouse floors

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Public roads, footpaths, and hardstanding areas

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Rail track beds and slab foundations

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Geobear process

Every site is unique, so our engineers start with a detailed survey and design a detailed treatment plan tailored to your project. This will specify exactly where the geopolymer is to be injected and at what level and in what quantities.

Geobear has a range of 22 different geopolymers which have differing performance characteristics, the engineers will choose the one which is best suited for your project.The geopolymer is installed via 12mm diameter temporary steel tubes, which are drilled into the ground to the required depth.  The geopolymer is injected in liquid form which then rapidly expands in-situ into a hardened material with specific engineering properties. The expansion creates lift and the amount injected is controlled to create the amount of re-levelling required.

The reaction profile of the geopolymer is very quick in comparison to cementitious grouts, gaining 90% of its compressive strength within 15 minutes and then fully cured within 1 hour. Throughout the process, we monitor the re-levelling with real-time laser monitoring  – ensuring precision, control, and reliable results.

Geobear at London City Airport

 

Geopolymer gains 90% of its compressive strength within 15 minutes and fully cures within 1 hour

Case studies

Geobear has restored slabs for airports, ports, warehouses, and transport networks worldwide. Examples include:

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Ballasted level crossing

Ballasted level crossing

Increasing stiffness at level crossing

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Infra utilities case pipe belly hero

Pipe belly lifting

Lift and Stabilise Sewer Pipes on a New-Build Estate

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Airport slab stabilisation

Airport slab re-levelling

Re-levelled settled slabs at a major UK airport.

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Problems Geobear can solve

Infra Relevelling bridge slab crack

Slab settlement and cracking

Sunken or tilted concrete threatening structural integrity.

Infra airport relvelling

Sunken slab lips

Where traffic and aircraft navigate over sinking slabs, this can be a danger.

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Voiding and washouts

Cavities beneath slabs caused by erosion or water ingress.

Insta relevelling lip sunk

Loss of structural support

Slabs shifting due to weakened ground conditions.

Talk to Geobear

Don’t let a uneven slabs cause delays or disrupt operations. Speak to our engineers today and we’ll design a tailored re-levelling solution for your site.

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