What is typically found at the junction between a bridge deck and the back wall of the abutment?

An open expansion joint is typically found at the junction between a bridge deck and the back wall of the abutment. This type of joint is designed to accommodate movements caused by temperature changes, live loads, and other dynamic forces acting on the bridge structure. As the bridge expands and contracts, the open design allows for this movement without causing stress or damage to the bridge components.

The open expansion joint also facilitates drainage, preventing water from collecting in areas that could lead to deterioration of materials over time. This is essential in maintaining the integrity of the bridge and ensuring safety for users. Properly functioning expansion joints are critical in preventing cracking or other forms of structural distress in the bridge deck and abutment, ensuring a long service life for the structure.

The other types of joints listed serve different purposes and may not be suitable for this specific location.