00394974

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http://onlinepubs.trb.org...s/trr/1984/962/962-013.pdf

https://scholar.google.co...racy&publication_year=1984

A 17-year-old parking facility in metropolitan Detroit is experiencing floor slab deterioration. An investigation was performed to determine the nature and extent of deterioration and identify probable restoration alternatives. The investigation involved visual observation, materials testing, a chain drag delamination survey, and determination of concrete cover to slab reinforcement. The structural frame consists of a 12-in.-thick flat plate floor slab system spanning in two directions supported by columns approximately 30 ft on centers. Floor slab reinforcement in the top and bottom slab sections are galvanized reinforcing steel bars. The floor slab and ceiling deteriorated from corrosion-induced spalling. Chain drag and coring surveys indicate that approximately 26 percent of exposed floor surfaces and 5 percent of ceiling surfaces are delaminated or spalled to a depth of about 2 in. Clear concrete cover is generally good, with a low cover of about 1.25 in. and an average cover of about 2.25 in. The chloride content of the concrete, determined within the top 3 in. of the slab, ranged from 25.2 to 8.5 lb/yd3 of concrete. The average concrete compressive strength of the floor slab is about 5,670 psi. The average air content of the concrete was determined to be 2.3 percent. Slab concrete pH ranges from 9.93 at the deck surface to 10.82 at the 3-in. depth. Reinforcement section loss of upwards to 20 percent was noted at isolated areas.

Publication of this paper sponsored by Committee on Corrosion. Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved.

01419847

pp 82-85

1984

Transportation Research Record

0309037182

Print

Figures (3) ; Maps (1) ; References (8)

Air content; Chloride content; Compressive strength; Concrete; Corrosion; Corrosion protection; Delamination; Deterioration; Floors; Galvanized metals; Inspection; Material reinforcement; Materials tests; Parking garages; pH value; Slabs; Spalling; Vision

Restoration

Bridges and other structures; Design; Highways; Terminals and Facilities; I25: Design of Tunnels

TRIS, TRB

Jan 31 1986 12:00AM

• APPLICATION: DEEP GROOVING--A METHOD FOR IMPREGNATING CONCRETE BRIDGE DECKS (ABRIDGMENT)
• BRIDGE HEATING USING GROUND-SOURCE HEAT PIPES
• CATHODIC PROTECTION OF BRIDGE SUBSTRUCTURES: BURLINGTON BAY SKYWAY TEST SITE, DESIGN AND CONSTRUCTION PHASES
• CATHODIC PROTECTION OF BRIDGE SUBSTRUCTURES: BURLINGTON BAY SKYWAY TEST SITE, INITIAL PERFORMANCE OF SYSTEMS 1 TO 4
• CATHODIC PROTECTION OF REINFORCED CONCRETE BY USING METALLIZED COATINGS AND CONDUCTIVE PAINTS
• DETERMINATION OF IN-PLACE TIMBER PILING STRENGTH
• DEVELOPMENT: DEEP GROOVING--A METHOD FOR IMPREGNATING CONCRETE BRIDGE DECKS (ABRIDGMENT)
• FIELD EVALUATION OF OIL- AND GAS-PRODUCED BRINES AS HIGHWAY DEICING AGENTS (ABRIDGMENT)
• FIELD PERFORMANCE OF EXPERIMENTAL BRIDGE DECK MEMBRANE SYSTEMS IN VERMONT
• KANSAS' EXPERIENCE WITH INTERLAYER MEMBRANES ON SALT-CONTAMINATED BRIDGE DECKS (ABRIDGMENT)
• LEVEL-OF-SERVICE SYSTEM FOR BRIDGE EVALUATION
• MANAGEMENT OF BRIDGE MAINTENANCE, REPAIR, AND REHABILITATION--A CITY PERSPECTIVE
• PRODUCTION AND TESTING OF CALCIUM MAGNESIUM ACETATE IN MAINE