Evaluation of Mechanical and Corrosion Properties of MMFX Reinforcing Steel for Concrete

Gong, Lien; Darwin, David; Browning, JoAnn P.; Locke, Carl E. Jr.; University of Kansas. Dept. of Civil, Environmental and Architectural Engineering

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Evaluation of Mechanical and Corrosion Properties of MMFX Reinforcing Steel for Concrete

2004-02-01
By Gong, Lien ; Darwin, David ; Browning, JoAnn P. ; ...

[PDF-2.20 MB]

English

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Details:

Creators:

Gong, Lien ; Darwin, David ; Browning, JoAnn P. ; Locke, Carl E. Jr.

Gong, Lien ; Darwin, David ; Browning, JoAnn P. ; Locke, Carl E. Jr. Less -
Corporate Creators:

University of Kansas. Dept. of Civil, Environmental and Architectural Engineering
Corporate Contributors:

Kansas. Dept. of Transportation. Bureau of Materials & Research
Subject/TRT Terms:

[+]

Beams Corrosion Resistance Epoxy Coatings Geotechnology I34: Steels And Metals Laboratory Tests Materials Mechanical Properties MMFX Steels Reinforcing Steel Tension Tests
Publication/ Report Number:

FHWA-KS-02-8 ; SM Report No. 70

FHWA-KS-02-8 ; SM Report No. 70 Less -
Resource Type:

Tech Report
Geographical Coverage:

United States ; Kansas

United States ; Kansas Less -
TRIS Online Accession Number:

00970437
Edition:

Final Report
Corporate Publisher:

Kansas. Dept. of Transportation
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.)
Format:

PDF
Funding:

C1131/C1281
Collection(s):

US Transportation Collection
Main Document Checksum:

[+]

urn:sha256:f19ec1d5b673e42669714a214e9e66f70a1da32b53fe7cc54526bbb206542948
Download URL:

https://rosap.ntl.bts.gov/view/dot/16094/dot_16094_DS1.pdf
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Evaluation of Mechanical and Corrosion Properties of MMFX Reinforcing Steel for Concrete

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