United States Department of Transportation
i
Geotextile fabrics under an asphalt concrete overlay to retard reflective cracking : construction report.
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1992-07-01
[PDF-826.06 KB]
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Abstract:In an attempt to reduce the discontinuity between the bridge and the roadway due to the settlement and/or consolidation of the approach embankment, and experimental construction method was tested on the Lost River Bridge in Klamath County. The method consisted of combining soil in six 1' lifts, interlaced with the geotextile reinforcement. This method was designed to reduce the settlement of the newly placed fill, thus reducing the discontinuity. The Lost River Bridge was widened by 10'3'' on each side. The additional width of the bridge required short narrow sliver fills at all four corners. The geotextile reinforcement was only used in the sliver fills and did not run the whole width of the road-to-bridge transition. The material was easy to work with considering the small size of the project. Although the original plans called for the geotextile reinforcement to be used at two of the four corners, to allow for a control lane in the northbound direction, it was used at all four corners. A settlement plate was installed at each fill location before the first lift was put down to measure the settlement of the original soil under the new fill. The settlement of the new fill will be found by subtracting the original settlement soil from the total fill settlement. The construction of the sliver fills went well. The soil used for the fills was native soil from the job site. It consisted of about four different types of soil, and was granular in nature. Compaction requirement were met by placing each lift with 6 inches of loose soil. The construction of the new sliver fills gave a good ride immediately after construction. There were no bumps at the road-to-bridge transition.
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