原文传递
Soil Density Target Values.
| 题名： | Soil Density Target Values. |
| 作者： | reid, r. a. |
| 关键词： | moisture content, tests, embankments, training programs, density(mass/volume), base courses, soil tests, construction |
| 摘要： | The compaction of soil in embankments, subbase or base course layers is one of the most important aspects of road construction. In order to ensure the soil is placed as specified and with uniformity, frequent testing of the compacted soil is necessary. This testing requires the in-place dry density of the soil to be obtained along with the soil moisture content. The values are then compared to a specified standard, typically a percentage of standard Proctor density, and optimum moisture content (OMC) to determine if the sample meets the required specification. The South Dakota Department of Transportation (SDDOT) presently uses the Ohio Typical Moisture Density Curves to establish target moisture density values. This method of repeatedly establishing the target values can be a time consuming process that limits the time available for inspectors to perform other duties. Additionally, the ability to complete the required number of tests with the equipment and personnel available becomes challenging for the inspectors. In many cases it could require up to an hour to complete a single one point determination and moisture density test. The length of time required to complete each test means contractors are not obtaining timely feedback on the quality of their work. In the event a test fails, the contractor may be required to perform a significant amount of rework, causing delays and increasing costs. The research is focused on three issues: determining the suitability of current SDDOT soil and granular materials testing policies and procedures, developing recommendations for improving efficiency while maintaining or improving quality of soil and granular compaction testing policies and procedures, and to develop recommendations for a training program to address all procedural changes. / NOTE: Final rept. for 27 Sep 01-26 Dec 04. / Supplementary Notes: Prepared in cooperation with Texas Transportation Inst., College Station. Sponsored by John A. Volpe National Transportation Systems Center, Cambridge, MA. and Federal Highway Administration, McLean, VA. / Availability Note: 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： | u0809；65p |
| 报告类型： | 科技报告 |
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