Partially Grouted Revetment for Low-Volume Road Bridges [Tech Transfer Summary]
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2024-03-01
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Abstract:The Iowa secondary road system has a large number of scour-susceptible bridges or bridges with unknown foundation conditions. While scour countermeasures have historically included conventional riprap, fully grouted riprap, and other systems, a promising option is a partially grouted revetment (also known as partially grouted riprap). Partially grouted revetments have been used successfully in Europe and more recently in Minnesota to prevent scour or erosion in riverbeds and at bridge piers and abutments. Partially grouted revetments are constructed by placing rock, stone, and/or recycled concrete on a subsoil-compatible filter layer and then partially filling the voids in the matrix with a portland cement-based grout material. The intent of partial grouting is to increase the revetment’s stability while maintaining the flexibility of a looser matrix. Partial grouting also allows for the use of smaller and less expensive matrix material and a thinner revetment layer. Partially grouted revetment under a low-volume bridge. Countermeasures for scour can be costly, especially for counties with limited budgets, and there is a need to investigate alternatives that are both economical and effective. Partially grouted revetments show promise but have not been compared to existing countermeasures or evaluated thoroughly in Iowa conditions.
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