When the concrete attains sufficient strength, which elements are released?

The chemical pre stressing is also called as _______

In pre tensioning system, type of prestressing tendon used is _______

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

The applied force should be measured accurately in hydraulic devices while?

In Gifford-Udall system, the number of methods for prestressing members is?

The chemical pre stressing is generally suited for elements like _______

The method of chemical pre stressing is not suited for _______