Question

Which of the following is a movement joint with deliberate discontinuity but no initial gap?

(a) Contraction joint

(b) Expansion joint

(c) Sliding joint

(d) Construction joints

The question was asked in an online interview.

This intriguing question comes from Joints Provision and Water Bars in RCC Ducts of Aqueducts in division Cross Drainage Work of Irrigation Engineering

Answer 1

The correct answer is (a) Contraction joint

The best explanation: A joint which has no initial gap between the concrete on either side of the joint with a deliberate discontinuity and the joint being intended to accommodate contraction of concrete is called a construction joint. Expansion joint and Sliding joints are movement joints and there is a complete discontinuity in both the reinforcement and concrete.