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Portable Falling Weight Deflectometer Study.
| 题名： | Portable Falling Weight Deflectometer Study. |
| 作者： | HUMPHREY, D. N.; KESTLER, M. A.; STEINERT, B. C. |
| 关键词： | *Deflection-; *Pavements-; *Test-equipment.;Loads-Forces; Performance-evaluation; Subgrades-; Measureing-instruments; Compaction-; Asphalt-pavements; Concret-pavements; Seasonal-variations; Quality-control; Pavement-conditions; Laboratory-tests; Modulus-; Thaw-; Recovery-; Aggregates-; Roads-; Field-tests. |
| 摘要： | This research investigated the effectiveness of the Portable Falling Weight Deflectometer (PFWD) for evaluating the support capacity of pavements during the spring thaw and evaluating the adequacy of sub grade and base compaction during construction. The performance of ten asphalt and gravel surfaced low volume roads were evaluated through spring thaw and recovery. Comparisons were made to the traditional FWD as well as other portable measuring devices. It was shown that the PFWD was able to follow seasonal stiffness variations and compared well with FWD derived moduli on both asphalt and gravel surfaces. Recommendations were made for using a PFWD to determine when to place and remove load restrictions. Field and laboratory tests were conducted to develop correlations between composite modulus, percent compaction, and water content for a range of aggregate types typical of New England. Comparisons were made between multiple PFWDs. A tentative technique was recommended for using a PFWD for compaction quality control for aggregate base and sub base courses. This is based on a rough equivalency between the PFWD composite modulus and percent compaction for aggregate at optimum water content. Factors are provided to correct the modulus at the field water content to the equivalent value at optimum. |
| 报告类型： | 科技报告 |
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