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URETEK PAVEMENT REPAIR Highways & Airports

The URETEK Method FOR PAVEMENT UNDERSEALING & LEVELLING

The URETEK Method is one of a number of internationally patented URETEK technologies. It employs special high density polymers to underseal and void-fill, and then lift and realign concrete pavement slabs which are bearing directly on the ground.

Through small 15 mm ( 5/8") drilled holes, polymer resin components are injected directly under the concrete. As the resin mixture expands, voids are filled, the sub-base strengthened and the section stabilised. The controlled mould pressure exerted on the underside of the concrete can be used to raise and relevel the slab, if sunken.

The area treated each time is controlled. Multiple pattern-drilled injection locations allow re-support and accurate re-alignment of an entire slab.

The composite material quickly cures into a strong, stable, and long-lasting replacement sub-base material.

KEY BENEFITS

Minimal disruption to road traffic - normally only one lane closed at at time.
Major sections are usually restored in only one shift, and short sections in only an hour.
Takes traffic again in 30 minutes.
Fast and efficient - up to 600 square metres per day (6000 square feet).
Technology proven by extensive use on highways throughout USA, UK, Germany and Australia.

URETEK ADVANTAGES

The time required to implement a repair using The URETEK Method is significantly shorter than with any other method being used today.

URETEK material is guaranteed for a period of ten years against any significant shrinkage or deterioration.

The material used in The URETEK Method has superior void-filling characteristics.

The smaller diameter and reduced number of holes used in the injection process results in no slab bottom breakout at holes and far less overall slab weakening.

Unlike other slab raising procedures, The URETEK Method does not depend on hydraulic force to lift a slab. The amount of subsided area to be raised is readily controlled, so there are fewer chances for slab cracking and breaking. Also, minimal pumping pressure and rapid curing of URETEK resin reduces the amount of material escaping through unrelated voids and channels. Slab raising is more controllable, more accurate and more efficient.

Expansion of URETEK resin into cracks provides a positive seal to help prevent water infiltration but, unlike cement grout, it will not block the function of expansion joints.

URETEK resins are hydrophobic and not compromised when injected into moist soils or free water under pavements and slabs.

The increased controllability of the injection process makes possible fractional raising of slabs and multiple adjustment capability for such locations as fault lines.

APPLICATIONS

URETEK has repaired highways, streets, airport runways, railways, port facilities and driveways & parking areas of commercial buildings and industrial facilities.

Situations where The URETEK Method may be used to advantage include:

General subsidence of the subgrade
The URETEK Method may be used to repair and relevel whole lengths of pavement, or small isolated areas, depressed because of subgrade settlement.

Voids caused by subgrade settlement can be filled even before the pavement sinks, providing a non-compressible barrier beneath the pavement to prevent ongoing deterioration due to traffic

Steps at joints between pavement slabs.
Accurate correction of movement and differential settlement along joints between pavement slabs. One to two hundred lineal metres (300-600 lineal feet) of joints can be corrected in a day.

'Pumping' action along joints
A major cause of road failure is water ingress through joints between concrete pavement slabs. This weakens the sub-base and allows the slab to deflect. Deflection pumps out dirty water. That is, water containing fine particles from the sub-base. The sub-base is consequently eroded. More deflection occurs and the cycle continues. URETEK expels the water, fills the void and stops the cycle.

Erosion
Remediation of massive washout of the sub-base due to flooding or a burst water pipe or minor voiding due to a leaking sewer or stormwater line or pit.

Minimal disruption _ Cost-effective _ Permanent

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