The linear expansion of the cement in chemical pre stressing is about _______

In which place thermo electric pre stressing found to be more economical?

The concrete dams are constructed using which?

The method of tensioning Magnel-Balton system involves _______

In post tensioning, the concrete units are cast by _______

The method of pre stressing by heated tendons, achieved by passing an electric current is known as _______

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

The yield stress relieved in wires is about _______