The Hoyer’s method of prestressing is done by _______

The thermo electric pre stressing, initial stress in tendons ranges between _______

The use of bar tendons with threaded anchorages reduces the possibility of _______

The chemical pre stressing is also called as _______

The basic chemical substance used for pre stressing forces in concrete member is _______

The thermo electric pre stressing is also used in _______

The electrical devices are commonly used for tensioning of _______

In Hoyer’s system the projection of plugs left in concrete exceeds beyond _______