Global ETD Search
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Showing 1 to 4 of 4 for “"hardened air"”.
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Developing An Alternative Hardened Concrete Air Void Characterization Method
… an alternative characterization method for the hardened air void system in concrete. This study uses ASTM C457, “Standard Test Method for Microscopical Determination of Parameters of the Air-Void System in Hardened Concrete” as a baseline characterization method and attempts to thoroughly reduce …
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Fractionated reclaimed asphalt pavement as a coarse aggregate replacement in a ternary blended concrete pavement
… have primarily studied the effects of RAP on the hardened properties in concrete, but there have been limited studies on the comprehensive effect on the fresh, hardened, and durability properties of a single source of FRAP in concrete at various replacement levels. In this study, as the FRAP …
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Microstructure characterization of foamed cement and concrete
… is a major durability issue in cold climates. Air-entraining admixtures are used to create a network of fine bubbles that enhance frost resistance. Experience has shown that fresh air content alone cannot predict the effectiveness of the entrained air system. Instead, parameters such as bubble …
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Freeze-thaw environment of precast concrete crossties and effect of vibration on fresh materials
… examines the stability of chemically entrained air bubbles in fresh concrete when the fresh material is subjected to varying time and degree of vibration. The propagation and attenuation of the vibratory peak acceleration as a function of distance from the vibrating source and the volume content …