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DURABILITY OF GEOSYNTHETIC SOIL REINFORCEMENT ELEMENTS IN TANQUE VERDE RETAINING WALL STRUCTURES.
| 题名： | DURABILITY OF GEOSYNTHETIC SOIL REINFORCEMENT ELEMENTS IN TANQUE VERDE RETAINING WALL STRUCTURES. |
| 作者： | Bright-DG; Collins-JG; Berg-RR |
| 关键词： | DURABILITY-; GEOSYNTHETICS-; REINFORCEMENT-; RETAINING-WALLS; HIGH-DENSITY-POLYETHYLENE; GEOGRIDS-; REINFORCED-EARTH; TUCSON-ARIZONA; SAMPLE-MATERIAL; LABORATORY-TESTS; TEST-RESULTS |
| 摘要： | The findings of an investigation into the stability and durability of high-density polyethylene (HDPE) geogrid soil reinforcing elements used in grade separation structures on a project at the Tanque Verde-Wrightstown-Pantano Roads intersection in Tucson, Arizona, is documented. The project represents the first use of geogrid reinforcement in concrete-faced, mechanically stabilized earth retaining walls in a major transportation-related application in North America. The reinforced soil walls were constructed in 1984 and 1985, and the geogrids have been in service for 8 to 9 years in an elevated temperature environment that accelerates the mechanisms of degradation. The combined effects of age and temperature exposure made this project a candidate for evaluation of geosynthetic reinforcement stability and durability. A sample retrieved from the project was subjected to a series of laboratory procedures and tests. Results of the tests are presented as topological analysis, ultimate tensile strength, ultimate tensile strain, 1,000-hr creep response, melt rheology, melt temperature range, crystallinity, and oxidative induction times. Test results are compared to archived geogrid values. Soil samples also were retrieved and analyzed. It is concluded that after more than 8 years of exposure to an elevated temperature environment, the exhumed HDPE geogrid has not experienced any significant change in the physical and performance properties of the geogrid or the morphological properties of the HDPE. |
| 总页数： | Transportation Research Record. 1994. (1439) pp46-54 (8 Phot., 5 Fig., 3 Tab., 9 Ref.) |
| 报告类型： | 科技报告 |
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