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https://nap.nationalacademies.org/catalog/27432/critical-issues-in-transportation-for-2024-and-beyond

CAR PARK REFURBISHMENT IN USA

Although concrete is a relatively durable construction material, corrective measures are constantly required to realize the design service life of car parks. Car parks are directly exposed to the aggressive elements and experience very harsh conditions that contribute to accelerated deterioration and premature failure of the concrete structure. The reasons why car parks deteriorate are discussed. A case study of the refurbishment of the Chicago Park District Grant Park South underground car park is presented. Concrete deterioration was the most significant distress in the car park. Chloride contamination is the primary cause of the concrete deterioration observed in the car park floor slab and in the roadway slabs supporting Michigan Avenue and Jackson Street. Field tests material examinations and exploratory excavations were undertaken. Based on the need to restore integrity of the severely deteriorated floor slab and to provide floor-slab protection to extend the service life of the repairs, four repair alternatives were analyzed to meet strategic objectives and available funds for the project. The result of this life cycle cost analysis confirmed that full depth slab replacement would provide a more cost-effective, long-term solution for both the garage floor and the roadway slab. To extend the service life of the replacement car park and roadway slabs, currently available corrosion protection systems and additives were incorporated. The durability of the roadway placement slab was enhanced with micro silica concrete and epoxy-coated steel. This corrosion protection system met the requirements for durability specified by the Chicago Department of Transportation. Micro silica concrete with calcium nitrate corrosion inhibitor was included in the concrete for the car park replacement floor slab. Black steel (in lieu of epoxy coated) was used to reduce the expected restrained shrinkage cracking associated with the existing walls and columns. The concrete durability was also enhanced by providing additional concrete cover over the new steel reinforcement, and application of a traffic bearing membrane on the floor slab. One of the biggest challenges during construction was the demolition and replacement of the concrete slabs while the street and parks remained in operation. Architectural improvements included visual, durability and code improvements. Entry/exit, lighting and ventilation improvements were also made. For the covering abstract see ITRD E122906.

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  • Corporate Authors:

    ENGINEERING TECHNICS PRESS

    46 CLUNY GARDENS
    EDINBURGH,   United Kingdom  EH10 6BN
  • Authors:
    • SHIU, K N
    • CHURCH, L
    • BHUYAN, S
  • Publication Date: 2003

Language

  • English

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00982858
  • Record Type: Publication
  • Source Agency: Transport Research Laboratory
  • ISBN: 0-947644-53-9
  • Files: ITRD
  • Created Date: Dec 2 2004 12:00AM