| Title |
Evaluation of mechanical and corrosion properties of MMFX reinforcing steel for concrete |
| Record ID |
24644 |
Personal Name
Creator |
Gong, Lien; Darwin, David; Browning, JoAnn P.; Locke, Carl E. Jr. |
Corporate
Contributor |
University of Kansas; Kansas Department of Transportation |
| Publication Date |
20040000 |
| Abstract |
The corrosion performance of MMFX and conventional reinforcing steels is compared based on macrocell and bench-scale tests. The conventional steel includes epoxy-coated and uncoated bars. Macrocell tests are conducted on bare bars and bars symmetrically embedded in a mortar cylinder. Specimens are exposed to a simulated concrete pore solution with a 1.6 or 6.4 molal ion concentration of sodium chloride. Bench-scale tests include the Southern Exposure and cracked beam tests. A 15% (6.04 m ion) NaCl solution is ponded on the top of both the Southern Exposure and cracked beam specimens. Mechanical properties are compared with the requirements of ASTM A 615. The uniformity and consistency in chemical composition is evaluated using a scanning electron microscope and an energy dispersive spectrometer. The microstructure of corrosion products is analyzed using a scanning electron microscope. The results indicate that MMFX steel exhibits better corrosion resistance than conventional uncoated steel, but lower corrosion resistance than epoxy-coated bars. In both the macrocell and bench-scale tests, MMFX steel exhibits a macrocell corrosion rate between one-third and two-thirds that of uncoated conventional reinforcing bars, while epoxy-coated reinforcement with the coating penetrated corrodes at a rate between 5% and 25% that of conventional steel. MMFX reinforcing steel is not recommended as a replacement for epoxy-coated reinforcement unless it is used in conjunction with a supplementary corrosion protection system. (132 p.) |
| TRT Terms |
Corrosion  ; Reinforced concrete ; Reinforcing steel ; Epoxy coatings ; Laboratory tests |
| General Subjects |
MMFX steels |
| Classification |
NTL - HIGHWAY/ROAD TRANSPORTATION - Materials |
TRIS Online
Accession No |
00970437 |
| Resource type |
Web Document |
| URL |
http://ntl.bts.gov/lib/24000/24600/24644/KS028_Final_Rep.pdf |
| Format |
PDF |
| Language: |
English |
| Database |
NTL Digital Repository |
TRT
