Essay On Smart Prestressing

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INTRODUCTION Today, more and more researchers are focusing on smart materials for their special properties and performance in civil engineering applications. The shape memory alloys (SMAs) is a kind of smart material which can be used as a prestressing tendon. Shape memory alloys can exist in two phases at different temperatures and stresses. Austenite, which exists in high temperature, and Martensite, which exists in low temperature. When the external temperature or stress condition changes, these two phases will transform to the other phase, depending on what change appears. SMA exhibits many special properties during the transformations between these two phases, such as shape memory effect (Fig. 1.1), super elasticity effect, etc. Properties of shape memory alloys The shape memory alloys…show more content…
Use of smart prestressing reduce these losses. Conventional prestressing technology is very difficult to execute and it requires special equipment’s for this purpose. Execution of smart prestressing is comparatively easier and noise free this makes this technology more environmental friendly. Self compacting concrete, with its unique ability to consolidate under its own weight, is the future of concrete industry with its added efficiency in terms of cost and time management. The flexural strength of self compacting concrete is much higher than that of ordinary concrete. Imparting prestress in self compacting concrete members makes sections even lighter and reduces the overall dead weight of the member. This technology is ideal for rail and highway bridges. By providing parabolic and eccentric tendons moment can be easily counteracted. OBJECTIVES Increase the load carrying capacity of a simply supported beam using a Shape Memory Alloy wire as a prestressed tendon, instead of steel

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