Which statement about joint design and sealing in concrete slabs is accurate?

• A. To control cracking, accommodate movement, and minimize water intrusion; joints and seals must conform to plan.
• B. To purely improve surface finish aesthetics.
• C. To simplify form removal regardless of movement.
• D. To allow unlimited movement without sealing.

Answer: (A)

The main idea is that concrete joints are there to manage where and how cracks form and to absorb movement from temperature changes, shrinkage, and loads, while the sealant keeps water and other deleterious substances out of the joint. Joints and seals must conform to the plan so their spacing, type, width, and sealant choices match the design intent and ensure the slab behaves as expected. When joints are placed and sealed correctly, cracks are controlled, movement is accommodated, and water intrusion is minimized, all of which protect durability and performance. The other options miss essential functions: aesthetics alone doesn’t address cracking or movement; making form removal easier ignores how slabs actually move; and allowing unlimited movement without sealing would lead to uncontrolled cracking and water ingress.