Daily Archives: May 21, 2015

Aging Concrete Flume Undergoes Waterproofing Rehabilitation

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Aging Concrete Flume Undergoes Crystalline Rehabilitation

First constructed in 1950, the Jackson Gulch Reservoir is a vital resource to resident and visitors of the high mountain regions of Southwestern Colorado. It supplies much-needed water to 13,746 acres of agricultural lands and domestic water to Mesa Verde National Park, Mancos Rural Water Company and the town of Mancos.

When the Jackson Gulch Reservoir infrastructure began to show signs of wear and tear, its owner, the Mancos Water Conservancy District, was justifiably concerned. A condition assessment and recommendation report was prepared by Buckhorn Geotech.

The off stream reservoir is fed by the 2.6 mile concrete Inlet Canal that extends from the Mancos River. The Inlet Canal includes a one-mile U-shaped concrete flume that was showing signs of serious deterioration ranging from surface spalling of the floor and joint deterioration to wall blowouts and vertical wall cracks.

Per the district’s request, Buckhorn Geotech initiated a three-year program to test various membrane liners, only to find that conventional liner solutions were not ideal in this environment.

“In the event of a membrane leak, the ability to locate any penetration and create a clean moisture-free repair was a real concern to the district,” said Norm Aufderheide, an engineer with Buckhorn Geotech.

Buckhorn Geotech selected the Xypex spray-on crystalline waterproofing system for the project. The firm had successfully used the system on smaller concrete projects with similar deterioration problems. Blended into fresh concrete or spray-coated on existing concrete, the product can seal the paths by which water and aggressive chemicals penetrate, attack, and ultimately threaten the long-term integrity of a concrete structure.

“We selected the crystalline waterproofing system for the repair and protection of the concrete flume because it could be installed in confined spaces as well as the system’s ability to seal or heal itself should damage occur to the concrete surface from falling rock or routine maintenance in the coming years,” Aufderheide said.

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XYPEX - Northshore Hospital Car Park

  • Location: Milford, Auckland
  • Project Dates: September 2011 – September 2011

Xypex Case Studies – Northshore Hospital Car Park

Project Description

Northshore Hospital and its car park is located beside Lake Pupuke, and being less than 1.5km from Takapuna Beach, so is exposed to wind-driven chlorides from the Hauraki Gulf. The addition of Xypex Admix to the car park concrete is expected to increase the design life expectations of the structure, by resisting chloride penetration through the 40MPa concrete and imparting its renowned self-healing ability for fine cracking. The top deck of this car park was post tensioned over 3 large pours, with 4,822kg of Xypex Admix C-1000NF added to the in-situ cast concrete slab for waterproofing and steel reinforcing protection. Two construction joints that crossed the level 6 deck were waterproofed using 112m of Kuniseal C-31DS Waterstop and Xypex Concentrate. Concrete test cylinders taken during the Level 6 deck pours were routinely achieving between 50-55MPa.

Project Details

  • Project Type: New
  • Structure Type: Exposed Parking Deck
  • Type of Construction: Post-Tensioned Reinforced Structure
  • Type of Cement: GP

Products Used

Project People

  • Construction Company: Brookfield Multiplex
  • Concrete Supplier: Firth
  • Xypex Applicator: Dominion Constructors
  • Architectural Firm: Jasmax
  • Engineering Firm: MSC Consulting Group Ltd

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