Bridge Joints are gaps purposely left between segments of a bridge to allow for thermal movement. Since bridge temperatures change more rapidly than road temperatures, the two pavement surfaces expand and contract at different rates. Without bridge joints, the two different pavements would begin to destroy each other, the actual bridge structure could become damaged, too. To prevent water and debris from entering these joints, they need to be sealed with an air-tight, waterproof, and flexible material.
Matrix 501™ & Matrix 502™
The Crafco Matrix 501 Asphaltic Plug Bridge Joint System is a pre-measured, pre-blended, hot-applied bridge expansion joint system composed of a uniquely formulated polymer modified asphalt binder and select aggregate. Simply level the material and allow to cool. No compaction is required. Matrix 501 can be used for expansion, fixed end, and pressure relief joints, in both new construction or rehabilitation projects. Matrix 501 can be installed on skews up to 30 degrees (up to 45 degrees for low traffic pavements). Crafco Matrix 501 is low cost, quick, and easy to install and maintain. Crafco Matrix 501 joints meets the requirements of ASTM D6297, Standard Specification for Asphaltic Plug Joints for Bridges.
An unblended version, named Matrix 502 is is primarily composed of Matrix 502 Binder and two grades of Matrix 502 aggregate. Additional components include primer, backer rod, bridging plates and locating pins. Both Matrix 501 and Matrix 502 are available globally, but Matrix 502 is only sold in North America through D.S Brown Company.
TechCrete is a hot-applied mastic specifically formulated to fill voids in concrete. TechCrete adheres extremely well to concrete and asphalt and forms an air-tight and waterproof seal. TechCrete remains flexible in most winter conditions and can handle movement across joints when applied properly. TechCrete can perform with the movements associated with many plug joints for bridges. See your Crafco representative for limitations with bridge joint use.