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BluCem EA55 Low Thermal Cementitious Grout

DESALINATION PIPELINE, VICTORIAN

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The new Plant will be connected to the existing Power Grid by 85km of High Voltage Alternate Current Underground Cables (HVAC). The cable has been installed in the same easement as the Transfer Pipeline.

PROJECT REPORT SHEET: GROUTING CABLES IN THRUST BORES

PROJECT COMPLETION: NOVEMBER 2012

CLIENT/END USER: VICTORIAN GOVERNMENT AQUASURE THIESS DEGREMONT

APPLICATION

WHERE WE USED BLUCEM EA55

The grout was placed in under bores up to 120m long to encapsulate the High Voltage cables.

 

WHY WE USED BLUCEM EA55

The electrical design demanded that cement based backfill around PVC cable conduits in trenches and in under-bores had a thermal resistivity (TR) less than 0.9 and low exothermic heat to avoid heat damage to the conduits during curing. An additional requirement in the under-bores for fluidity, low bleed and high compressive strength influenced the decision by the asset owners to use a grout that had a proven track record for this application.

The BluCem EA55 grout was supplied in 1200kg bulk bags which allowed batching in 4.0 cubic metre agitators and pumping through a conventional concrete pump.

 

FEATURES

BluCem EA55 has very low thermal resistivity.

BluCem EA55 has very low exothermic heat during curing

BluCem EA55 has low bleed, high fluidity for pumping long distance and high compressive strength

 

BENEFITS

Batching in agitators and allowed continuous delivery of the grout

Allowed designers to assume high thermal transfer around the cables which offers superior cable ratings economies in selection of cable sizes

Eliminates the risk of damage to PVC conduits during installation of the grout

Ensures continuous pumping and compete filling of the annulus

High compressive strength provides structural longevity of the road pavement above the under-bore

 

SUMMARY

The contractor and the asset owner benefited from the technology offered by the BluCem EA55 grout where the backfilling of the under-bores was within expected construction timetables and through support from Bluey Technologies’ engineers the product was batched and placed in a safe and efficient manner with all of the expected technical benefits realised.

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