Matrix (Partially Grouted) Riprap Lab Flume Study

Summary:

Researchers evaluated the performance of matrix riprap when used on spill-through abutments, including the effects of size, stone angularity and percent grout under a variety of flow conditions. Researchers were unable to fail matrix riprap with hydraulic flume tests, confirming that it is significantly stronger than regular riprap. MnDOT is moving forward on using matrix riprap in areas of Minnesota with few sources of large angular rocks or where vandalism is a problem.

Final Deliverables:

• Report #2015-15
• Research Summary

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• Riprap grout protects bridge abutments  - (Blog Post)

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