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- W212420311 abstract "The objective of these studies was the development of soil treatments which can decrease the thermal resistivity and increase the thermal stability of trench backfills around buried power cable systems. Laboratory thermal needle resistivity studies were made of numerous proposed backfill additives. Primary emphasis was placed on the effectiveness and durability of wax additives, the leaching resistance of a polymer additive, and the effectiveness of asphalt and other petro-additives. A one-dimensional explicit finite difference program using the Philip and de Vries Theory was developed to evaluate the coupled heat and moisture flows in a layered soil system. A field test facility consisting of ten 10 ft long simulated buried cable sections was constructed. Six were subjected to thermal loadings prior to writing this report. The field test sections are instrumented with thermocouples and fringe capacitance moisture probes. Comparisons of measured temperature profiles in the trenches and those predicted by a finite element heat conduction program are presented. Agreement is generally good. A comparison is also given of measured moisture profiles and those calculated by the one-dimensional model for one of the test sections. The agreement is not good, and the discrepancy may be due to the restriction of flow tomore » one dimension. The predictions seems sensitive to small changes in backfill density and fines content. Operation of the field test sections to establish the long-term effectiveness of the backfill treatments continue. So far the treatments appear to be functioning well.« less" @default.
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- W212420311 date "1981-06-01" @default.
- W212420311 modified "2023-09-26" @default.
- W212420311 title "Backfill materials for underground power cables. Phase II. Backfill treatments, heat and moisture flow analyses, and field tests. Interim report" @default.
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