A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Low Porosity High Strength Concrete for Highway Bridge Decks (Joint Highway Research Project)
Premature failure of concrete bridge decks stemming from chloride-induced corrosion of reinforcing steel constitutes a major problem. This study relates to the possibility of substituting low porosity concrete (made with gypsum-free portland cement) for conventional concrete on bridge decks. Relevent properties of certain experimental low-porosity concretes, formulated with and without flyash, were determined experimentally and compared with the corresponding properties of conventional bridge deck concrete formulations and also with those of Iowa-type dense concrete mixtures. Conventional concrete was shown to be deficient in terms of long-term resistance to the penetration of chloride ions, and in terms of maintaining steel passivation once the chloride had penetrated. Measured characteristics of the dense concretes were generally superior to the conventional bridge deck mixes, but grossly inferior to the low porosity concretes. Low porosity concretes could be formulated to produce flowing concrete of good workability at w:c 0.28. Strengths developed were in the range 10,000-13,000 psi, and these concretes showed excellent freezing resistance, reduced drying shrinkage, reduced carbonation, and a tight pore structure.
Low Porosity High Strength Concrete for Highway Bridge Decks (Joint Highway Research Project)
Premature failure of concrete bridge decks stemming from chloride-induced corrosion of reinforcing steel constitutes a major problem. This study relates to the possibility of substituting low porosity concrete (made with gypsum-free portland cement) for conventional concrete on bridge decks. Relevent properties of certain experimental low-porosity concretes, formulated with and without flyash, were determined experimentally and compared with the corresponding properties of conventional bridge deck concrete formulations and also with those of Iowa-type dense concrete mixtures. Conventional concrete was shown to be deficient in terms of long-term resistance to the penetration of chloride ions, and in terms of maintaining steel passivation once the chloride had penetrated. Measured characteristics of the dense concretes were generally superior to the conventional bridge deck mixes, but grossly inferior to the low porosity concretes. Low porosity concretes could be formulated to produce flowing concrete of good workability at w:c 0.28. Strengths developed were in the range 10,000-13,000 psi, and these concretes showed excellent freezing resistance, reduced drying shrinkage, reduced carbonation, and a tight pore structure.
Low Porosity High Strength Concrete for Highway Bridge Decks (Joint Highway Research Project)
S. E. Coleman (author) / M. Maage (author) / S. Diamond (author)
1982
343 pages
Report
No indication
English
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