HDPE Sheathing For Post-Tensioned Prestressed Concrete Structures
Over Galvanised Metallic Ducts – A Study
S.G. Bapat, Chief Engineer (Civil-Designs) Retd; Mr. Arvind Shrivastava, Addl. Chief Engineer (Civil) Nuclear Power Corporation of India Ltd. Mumbai, and Mr. Umesh K. Rajeshirke, Spectrum Consulting Engineers, Navi Mumbai.
Introduction
Prestressing duct is one of the vital elements of total prestressing system.
The main functions of the duct are:
- To create cavity / void in the concrete, along the profile of the prestressing cable so that the cable can be threaded into it after the concrete gets hardened.
- To provide the protection against the corrosion to the prestressing steel.
Different types of ducts are available and they can be classified depending upon their surface profile, such as plain or corrugated, and depending on the material from which these ducts are manufactured, such as metallic or non-metallic.
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NBM&CW November 2010
