The Hoyer’s system of prestressing proves to be economical for _______

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

Hoyer’s system of pre tensioning is generally adopted for _______

The tensile stresses developed in steel by the expansion of concrete are about _______

The chemical pre stressing is also called as _______

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

The commonly used mechanical devices used in the following statement.

The period of cooling in thermo electric pre stressing is observed as _______