Which materials are used in a pourable joint seal?

The correct answer identifies the components of a pourable joint seal, which typically consists of backing material, joint filler, and poured joint sealant.

In bridge and pavement applications, a pourable joint seal serves to protect the joints from water infiltration and to accommodate movement caused by thermal expansion or contraction. The backing material often provides support to the sealant, ensuring that it maintains its integrity while allowing for the necessary joint movement. The joint filler may help to occupy space within the joint and provide a surface to which the sealant can adhere, while the poured joint sealant itself forms the primary water-tight barrier.

This combination of materials is specifically designed to create a durable and flexible seal that can handle the dynamic forces experienced in such applications, contributing to the longevity and safety of the structure. In summary, the components listed in the correct answer work together to ensure the effectiveness and longevity of the joint seal.