| Title |
CORROSION OF GALVANIZED STEEL FLOOR SLAB REINFORCEMENT
|
| Accession No |
00394974 |
| Authors |
BHUYAN, S; Tracy, R G |
| Journal Title |
Transportation Research Record
No. 962 |
Corp. Authors
/ Publisher |
Transportation Research Board
|
| Publication Date |
19840000 |
| Description |
p. 82-85;
Figures(3); References(8) |
| Abstract |
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. |
Supplemental
Information |
This paper appeared in Transportation Research Record N962, Bridge Maintenance Management, Corrosion Control, Heating, and Deicing Chemicals. |
| TRT Terms |
Air content ; Chloride content ; Compressive strength ; Concrete ; Corrosion ; Corrosion protection ; Delamination ; Deterioration ; Floors ; Galvanized metals ; Inspection ; Materials tests ; Parking garages ; pH value ; Reinforcement (Engineering) ; Slabs ; Spalling ; Vision |
| Other Terms |
Concrete slabs; Corrosion prevention; Materials testing; Restoration; Steel reinforcement; Visual inspection |
| Subject Areas |
H25 STRUCTURES DESIGN AND PERFORMANCE; I25 Design of Tunnels |
| Availability |
Transportation Research Board Business Office Find a library where document is available
|
| TRIS Files |
HRIS |
| Database |
TRIS Online |
TRT
