Interlocking Concrete Pavement Institute (ICPI) Certification Practice Exam

Restoring joint integrity and slip resistance is achieved by reintroducing joint sand and cleaning the surface to remove debris that dulls traction, with sealing used where appropriate. The sand in the joints is essential for interlock and load transfer between pavers; when it wears away or washes out, joints loosen, pavers settle, and the surface becomes more slippery and unstable. Replacing or replenishing this sand restores interlock and supports the pavement under traffic. Cleaning is important because dirt, algae, and other buildup can reduce surface texture and grip, contributing to slick conditions. Sealing, when recommended, helps protect joints and the surface from water infiltration and can improve long-term slip resistance. Replacing the entire pavement, painting, or replacing edge restraints don’t address the underlying joint condition and usually aren’t the appropriate remedy for restoring joint integrity and traction in aging pavements.