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• W645661493 abstract "Part I of this report describes research that evaluated the use of supplementary cementitious materials (SCM) to improve the service life of bridges constructed in severe marine environments. The SCM studies included ultra-fine fly ash, ground granulated blast furnace slag, silica fume, and metakaolin, in conjunction with fly ash. The plastic, mechanical, and durability properties of concrete made with these SCM were tested. Additionally, mixtures using these SCMs were optimized for use in the precast, prestressed piling for the Key Royale Drive Bridge Replacement Project. Thirteen trial mixtures were prepared using varying proportions of portland cement, fly ash and selected SCM. One of the two control mixtures contained only portland cement and the second contained 18% fly ash cement replacement by weight. The remaining eleven mixtures contained 18% fly ash with varying portions of SCM. Using results from laboratory testing, a decision matrix was created to select the mixture proportions that exhibited the best overall performance for each SCM tested. One mixture from each SCM was selected to be used in the production of piles for the Key Royale Drive Bridge Replacement Project. The decision matrix included ratings for cost, mechanical properties, and durability. Although the costs of several mixtures were considerably higher than the controls, each mixture showed an overall improvement in mechanical and durability properties over that of the controls. Proportions determined to provide the most effective mixtures were those with 30% ground granulated blast furnace slag, 10% metakaolin, 12% ultra-fine fly ash, or 9% silica fume by weight of cement replacement. Part 2 of this report presents research in which microscopy techniques were used to measure chloride concentration in concrete. The experimental program involved preparing portland cement and water pastes that had known quantities of chlorides introduced during mixing. It was found that scanning electron microscope with energy dispersive spectroscopy (SEM/EDS) (using mineral standards) was able to measure chloride content that was within 23% of the titration values in quantities down to 800 ppm. It is recommended that Microprobe (EPMA) with wavelength dispersive spectrometer (WDS) be further evaluated for low values of chlorides." @default.
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• W645661493 date "2008-11-01" @default.
• W645661493 modified "2023-09-27" @default.
• W645661493 title "Development of Concrete Mixtures Containing Highly Reactive Pozzolans for Improved Durability in Florida Environments" @default.
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