ACI Concrete Transportation Inspector Practice Test 2026 – Your Complete All-in-One Guide to Exam Success!

Expansion joints are placed to absorb the movement that concrete undergoes with temperature changes. As concrete heats, it expands; as it cools, it contracts. If these movements were restrained, stresses would build up and likely cause cracking, spalling, or joint opening. The joints create a designed gap that allows each section to move independently while a flexible filler keeps the surface protected and watertight. While moisture changes can cause some swelling and curing temperature is a temporary condition during setting, the primary purpose of expansion joints is to accommodate thermal expansion and contraction.