Question

Which of the following is an advantage of using uncased cast-in-situ piles?

(a) They need no storage place

(b) The concrete cannot be damaged by driving

(c) Special equipment is not required

(d) All of the mentioned

This question was addressed to me in an internship interview.

This interesting question is from Uncased Cast-in-Situ Concrete Piles topic in section Pile Foundations of Geotechnical Engineering II

Answer 1

Right answer is (d) All of the mentioned

Easiest explanation: The uncased piles have the advantage that i) They need no storage place ii) they do not require cutting off excess length iii) do not require special equipment and iv) the concrete is not liable to damage from driving.