Pozzolans, such as fly ash and silica fume, are the most commonly used mineral admixtures in highstrength concrete. These materials impart additional strength to the concrete by reacting with portland cement hydration products to create additional CSH gel, .
products such as fly ash, bottom ash, boiler ash/ slag, and wastewater treatment sludge that are th en released into the environment. 5 However, even modern pollution control devices such as air filters do not prevent the escape of many hazardous emissions such as ultra fine particles. 6 Ultrafine particles are particles produced
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Besides, the effects of silica fume, ultrafine fly ash (UFFA) and sand as three main variable constituents of UHPC on workability and compressive strength as the main performance criteria and responses of this hightech material were investigated. The models proposed here demonstrate a perfect correlation among variables and responses.
Table 1 Materials types and densities. "Development of an ecofriendly UltraHigh Performance Concrete (UHPC) with efficient cement and mineral admixtures uses"
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Ultrasonic Dispersing of Silica, Fly Ash and Nanomaterials. The dispersing of silica, fly ash, pigments or other nanomaterials, such as carbon nanotubes, requires other processing intensities and energy levels. For this reason we recommend a separate ultrasonic mixer to produce a well dispersed slurry/paste that is then added to the concrete mix.
Elements depleted in the ultra fine ash were Ca, Si, Al, Mg, Fe, Mn, P and Ti. The benchscale test showed that the ultrafine particle concentration was increased by a higher bed temperature and decreased due to sludge moisture. As, Cd, Pb and Rb were enriched in the ultrafine ash on a bench scale, while Ba, Co, Sr and V were depleted.
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Welcome to the Department of Civil Engineering at the Amrita Vishwa Vidyapeetham. Currently, the department offers Bachelor of Technology (B. Tech.) in Civil Engineering, Master of Technology (M. Tech.) in Structural and Construction Engineering and programs in Thrust areas.