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Award of Sustainability

Gold Bar Primary Clarifiers No. 7 and 8:
Concrete Beam and Wall Repairs
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Edmonton, Alberta, Canada

Submitted by Read Jones Christoffersen, Ltd.


Gold Bar Primary Clarifiers No. 7 and 8

Owner
EPCOR Water Services, Inc.
Edmonton, AB, Canada

Project Engineer/
Designer

Read Jones 
Christoffersen. Ltd.
Edmonton, AB, Canada

Repair Contractor
Sure-Form Contracting, Ltd.
Edmonton, AB, Canada

Material Suppliers/
Manufacturers

The Sherwin-Williams 
Company
La Center, WA

Sika Canada, Inc.
Edmonton, AB, Canada

The sustainable design goals for the project were established early in the evaluation and preliminary design process, based upon the premise that reconstruction of the wastewater treatment plant’s existing, significantly deteriorated primary clarifier tanks presented a more sustainable, long-term, and cost-effective alternative to the demolition and construction of new tank structures.

The repair and protection of existing concrete infrastructure serves to reduce the potential overall global emissions of CO2 resulting from cement production. The construction of a large concrete structure, such as a wastewater treatment primary clarifier tank, represents many tons of CO2 emissions. Therefore, the owner has significantly reduced potential environmental impacts by undertaking this concrete repair and protection program as opposed to the construction of new, replacement primary clarifier structures.

In addition to repairing the existing deterioration and significantly extending the useful service life of the facility’s aging concrete infrastructure, the Gold Bar Primary Clarifiers No. 7 and 8 concrete beam and wall repair program included several structural concrete initiatives for environmental sustainability, including: the incorporation of significant levels of silica fume and fly ash (7.5 and 15% replacement of cement content, respectively) into the concrete materials; the selection of highly durable materials for concrete substrate repair, protective coatings, and expansion joints; existing reinforcing steel was maintained, cleaned, and reincorporated into the repaired concrete clarifier structure at interior and exterior wall surfaces; and the use of non-silica-based abrasive blasting materials, out of consideration for worker and facility user safety.

In addition to the reduced environmental impact, the cost savings represented by concrete restoration and renewal are significant when compared with the demolition, disposal, and construction costs of new infrastructure.

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