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Fly ash utilization in bridge works

Description

The primary purpose of this project was to determine the extent to which two fly ashes readily available in Alberta affect the properties of concrete considered for use in bridge works, and... More ≫

Description

The primary purpose of this project was to determine the extent to which two fly ashes readily available in Alberta affect the properties of concrete considered for use in bridge works, and accordingly to establish the conditions under which fly ash can safely be specified in such bridge works. The results confirm many potential advantages of using fly ash in air-entrained concrete, including reduced heat of hydration, the option to increase specified strength or reduce the unit volume cost, or some combination of both, particularly in massive bridge components, along with the prospect of satisfactory freeze-thaw durability under moist salt­-free exposure conditions, increased resistance to chloride ion penetration, and reduced shrinkage potential. Most of these benefits are realized more fully using a superplasticizing admixture instead of a conventional water-reducing admixture. The main concern and limitation associated with fly ash utilization in bridge works is unsatisfactory...

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Low temperature properties of asphalt cements and mixtures used in the C-SHRP Lamont test road in Alberta

Description

Several vehicle rollovers occurred during the first 48 months of service of the Highway 2/3 interchange near Fort Macleod. Fluorescent yellow green retroreflective sheeting product was installed... More ≫

Description

Several vehicle rollovers occurred during the first 48 months of service of the Highway 2/3 interchange near Fort Macleod. Fluorescent yellow green retroreflective sheeting product was installed at the interchange, and this study evaluates the effectiveness of this in reducing vehicle speeds when approaching this curve. The use of these chevron signs at this location help improve motorist maneuvering through this curve. Similar FYG signage should be considered for locations where early detection is required to heighten the travelling public's awareness of an unfamiliar or non-typical condition.

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