Monitoring of Duromaxx pipes installed on Manhead road in Rich County, Utah.
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Monitoring of Duromaxx pipes installed on Manhead road in Rich County, Utah.

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    This report documents the performance of two different culvert materials in an installation in northern Utah. The culverts are described as a DuroMaxx pipe made by CONTECH Construction Products, Inc. and an N-12 HDPE culvert made by ADS Corporation. Both culvert types are 24 inches in diameter. The DuroMaxx pipe was the type receiving actual evaluation; the ADS pipe installed nearby was used for comparison. A total of five inspections were made over a three year period. Culvert deflections at five locations along four culverts were measured each visit. The deflections and general observations about the pipe are reported. With the exception of two locations, both the ADS and DuroMaxx pipes have performed adequately. The ADS pipe in one location has a deflection of 7%, but is holding steady at that deflection which is described as marginal. Also damage has been done on the west entrance to the DuroMaxx pipe. The cause of the damage is unknown. Deflections are higher in the ADS pipe than in the DuroMaxx pipe. The magnitude of the deflections is primarily attributed to the small spacing and low soil compaction between adjacent pipes. The DuroMaxx pipe does achieve a smaller deflection in this situation.
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