What is the purpose of a neoprene seal in strip seal expansion joints?

Answer: C — Facilitates movement while sealing the joint

A neoprene seal in strip seal expansion joints primarily functions to facilitate movement while effectively sealing the joint. These seals are designed to accommodate the thermal expansion and contraction of the bridge structure, allowing for the natural movements without compromising the integrity of the joint. The neoprene material is flexible, which enables it to compress and expand in response to the varying conditions the bridge experiences. This characteristic is crucial because as the temperature changes, the bridge components can move apart or come together, and the neoprene seal accommodates these movements while ensuring that the joint remains watertight. This function is vital for maintaining the longevity of the bridge and preventing deterioration caused by water intrusion, which could lead to structural issues over time. The design of strip seal expansion joints with neoprene seals ensures that they remain effective in various environmental conditions, providing a reliable solution for managing joint movements effectively while protecting the bridge structure.