A preformed spiral of high strength steel is placed in the form, the concrete made by using ______

A reinforced concrete pressure pipe requires a large amount of ______

In monolyte construction the manufacturing process consists of pouring concrete under high frequency of ______

The rigorous methods generally involve computations to estimate the ______

The rebound tensile stresses in pile reinforcements are resisted by the ______

In general, concrete shells have thin cross sections, which prectude the use of large diameter?

Pile shoes are required for driving through ______

In the case of tapered poles with a reduced cross section the effective prestressing force should be ______