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Construction Technology

Repair and maintenance technology of gas heated pavement



1.     HEATING:


The portable thermal heater is positioned

 over the defect area, An 8 minute pulsed

heat cycle allows the fully controllable

and efficient NIT heater to penetrate the

 wearing course to relinquish its strength,

 creating a workable material without

carbonising or damaging it in the process.

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2.     SCARIFICATION:

To deliver a strong seamless joint,

operators scarify an area 50mm in from

the repair edge. This ensures integrity of

 the heated thermal joint between new

and existing material. No material is taken

 from the repair, everything is recycled in-situ, 

 resulting in no waste or landfill.

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3.     REJUVENATION:

High-grade enriched emulsion is added

to the repair area. This is evenly mixed

 through the recycled material to deliver

 a consistent and even exposure. This

 recoats the recycled aggregate increasing

 bitumen content to near ‘new materials’ levels.

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4.    NEW MATERIAL:

Material is supplied in 25kg bags for ease of

 use and is fed to and from the on board

hot-boxes. New material is heated to 100°C

before being transferred to the repair area.

Sufficient levels of material are added to

 create a level repair following compaction.

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5.    CHECKING TEMPERATURE:

An infrared thermometer is used tocheck

the temperature of the repair area, material

 temperature should be typically between

70-100°C to provide the best compaction

conditions. This many vary depending on

 material used.

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6.    COMPACTION:

Compaction equipment is specified in line

 with the repair area’s requirements. All

edges are compacted to create a mechanical

 interlock with the surrounding surface.


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