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BluCem EA55 Low Thermal Cementitious Grout

HIGH VOLTAGE FEEDER, ALICE SPRINGS

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The works involved 8km of trenching in urban areas with specialized flow-able low TR backfill and 2km of conduit for future 22KV upgrade in Alice Springs.

PROJECT REPORT SHEET: GROUTING AROUND CABLES IN THRUST BORES

PROJECT COMPLETION: NOVEMBER 2010

CLIENT/END USER: BMD CONSTRUCTIONS & ANCHORMAC FOR NT POWER AND WATER

APPLICATION

WHERE WE USED BLUCEM EA55 LOW THERMAL RESISTIVITY GROUT

Over 300 cubic metres of BluCem EA55 was pumped into the annulus between the PVC cable conduits and the steel sleeve pipe to ensure that there were no air gaps which would resist the transfer of heat away from the HV cables.

 

WHY WE USED BLUCEM EA55 LOW THERMAL RESISTIVITY GROUT

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. The BluCem EA55 grout could also be supplied in 1200kg bulk bags which allowed batching in 5.0 cubic metre agitators and pumping through a conventional concrete pump.

 

FEATURES

BluCem EA55 has a laboratory measured TR of 0.67

BluCem EA55 has very low exothermic heat during curing

BluCem EA55 has low bleed, high fluidity for pumping long distance and high compressive strength (>35Mpa)

 

BENEFITS

Batching in agitators and allowed continuous delivery of the grout

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

BENEFITS CONTINUED

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 underbores 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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