United States Department of Transportation
i
Dowel — Concrete Interface Material Categorization & Performance in Isolated Test Slabs
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2024-11-01
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[PDF-5.71 MB]
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Edition:Final Report
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Abstract:The Minnesota Department of Transportation (MnDOT) investigated the use of dowel bars with various anchoringmethods. This report examines the characteristics of various epoxy and grout anchorage systems at the interfacebetween new construction and existing concrete. Twelve different anchoring materials as well as various anchoringmethods were studied and compared to a control using no grout. This study did not examine the effects of thenumber of dowels used but instead was limited to the methods and materials used to anchor the dowels. Thisexperiment was performed on concrete panels in-house. The tube grout method exhibited the best visual andmagnetic imaging results. The evaluation methods did not clearly categorize the materials in order of performancebut showed advantages of cleaning the drill-hole prior to dowel placement as well as the merits and demerits ofusing a retaining collar. The results generally suggested the need for an actual deployment research project on actualpavement in real-world service conditions. The field experiment was reported in a separate document.
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