Kevin MacDonald, Cemstone Concrete Products With only a few weeks from collapse of the old bridge to commencement of reconstruction, there was no time to develop the concrete mixes from first principles. Consequently, concrete mixtures that had been used successfully
I-35W St. Anthony Falls Bridge
Jon Chiglo, Minnesota Department of Transportation On Thursday, August 2, 2007—less than 24 hours after the collapse of the I-35W bridge—a group of approximately 30 individuals from the City of Minneapolis, Federal Highway Administration, and the Minnesota Department of Transportation
HPC for 100-Year Life Span
Alan R. Phipps, FIGG Bridge Engineers, Inc. The new I-35W bridge across the Mississippi River in Minneapolis features high performance concrete (HPC) for all concrete components of this post-tensioned, box girder structure. The bridge accommodates 10 lanes of traffic and
FHWA Alkali-Silica Reactivity Development and Deployment Program
Gina Ahlstrom, Federal Highway Administration Alkali-silica reactivity (ASR) is a deleterious reaction that can occur in concrete mixtures when alkalis in the cement and other pozzolanic materials react with siliceous aggregates and expand when exposed to moisture. The Federal Highway
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ASR Prevention in Texas
Brian D. Merrill, Texas Department of Transportation For some states, alkali-silica reaction (ASR) in concrete has become just as big a concern as corrosion of reinforcing steel. Such is the case in Texas, where reinforcing steel corrosion mainly affects the