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Use of Dynamic Cone Penetrometer in Subgrade and Base Acceptance.
| 题名： | Use of Dynamic Cone Penetrometer in Subgrade and Base Acceptance. |
| 作者： | wu, s. sargand, s. |
| 关键词： | ohio, design criteria, soils, construction, material properties, quality control, monitoring, testing, paving operations, specifications, highways |
| 摘要： | The Dynamic Cone Penetrometer (DCP) is a simple device for measuring the stiffness of unbound materials. The DCP works by driving a steel rod into bases and soil with a preset amount of energy; the stiffness of unbound materials at different depths can be continuously monitoring the rate of penetration, yielding a stiffness profile. With its ability to collect and analyze data quickly and easily, the DCP compare favorably with other devices used to evaluate an in-situ base and subgrade during construction. The DCP is also the only device available today than can evaluate subgrade quality in all three dimensions. Most highway agencies accept unbound materials in base and subgrade based on density tests. But density is not a measurement of the strength (stiffness) of these materials. Field data collected in this study indicated that accepting the subgrade based on density tests did not guarantee the strength met design requirements. Accepting the base and subgrade based on density is thus one of the weak links in the process of designing and constructing pavement. / NOTE: Final rept. / Supplementary Notes: Sponsored by Ohio Dept. of Transportation, Columbus. Bureau of Research and Development. / Availability Note: Product reproduced from digital image. Order this product from NTIS by: phone at 1-800-553-NTIS (U.S. customers); (703)605-6000 (other countries); fax at (703)605-6900; and email at orders@ntis.gov. NTIS is located at 5285 Port Royal Road, Springfield, VA, 22161, USA. |
| 总页数： | u0721；124p |
| 报告类型： | 科技报告 |
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