Question

Which of the following is a movement joint with complete discontinuity in both reinforcement and concrete and intended to accommodate either expansion or contraction of the structure?

(a) Contraction joint

(b) Expansion joint

(c) Sliding joint

(d) Construction joints

I got this question in a national level competition.

My question comes from Joints Provision and Water Bars in RCC Ducts of Aqueducts topic in section Cross Drainage Work of Irrigation Engineering

Answer 1

Right choice is (b) Expansion joint

The best explanation: Expansion joint includes the provision of an initial gap which by opening or closing accommodates the expansion or contraction of the structure. It is sometimes advantageous to incorporate sliding surfaces for the design of the joint.