Why are transverse joints in paving or roadways filled and sealed?

• A. To prevent moisture loss
• B. To reduce risk of exposure to the reinforcing
• C. To speed curing
• D. To improve color uniformity

Answer: (B)

Transverse joints are filled and sealed to protect the embedded steel reinforcement from moisture and contaminants. When water, de-icing salts, and other agresive agents get into joints, they can reach the reinforcing and cause rusting and corrosion, which weaken the concrete over time. Sealing the joints minimizes capillary suction and water intrusion, helping to prevent corrosion and prolong the pavement’s life. The other options don’t fit because moisture loss, curing speed, or color uniformity aren’t the main concerns these joints address.