原文传递
EVALUATION OF CONSTRUCTING INCREASED SINGLE-LIFT THICKNESSES OF UNBOUND AGGREGATE BASES: CASE STUDY IN GEORGIA.
| 题名： | EVALUATION OF CONSTRUCTING INCREASED SINGLE-LIFT THICKNESSES OF UNBOUND AGGREGATE BASES: CASE STUDY IN GEORGIA. |
| 作者： | Bueno-JL; Stokoe-KH-II; Allen-JJ; Kalinski-ME |
| 关键词： | AGGREGATES-; BASE-COURSE-PAVEMENTS; CASE-STUDIES; COMPACTION-; GEORGIA-; LIFT-THICKNESS; MOISTURE-CONTENT; NONDESTRUCTIVE-TESTS; NUCLEAR-DENSITY-GAGES; SEISMIC-TESTING; SPECTRAL-ANALYSIS-OF-SURFACE-WAVES-SASW; STIFFNESS-; TEST-SECTIONS |
| 摘要： | A study was conducted to evaluate the feasibility of compacting unbound aggregate base courses in lifts thicker than those permitted by state departments of transportation (DOTs). At present, the majority of the state DOTs allow a maximum lift thickness of 20.3 cm (8 in.) or less. Work conducted in conjunction with the widening of a state road in Georgia is described. Three test pads of the same base material were constructed and evaluated: one Target Strip and two Test Sections. The Target Strip was placed in two lifts: a 17.8-cm (7-in.) lift followed by a 15.2-cm (6-in.) lift. Each test section was constructed in a single, 33-cm (13-in.) lift. Compaction of the unbound aggregate base courses was evaluated by conventional nuclear density gauge (NDG) testing. Additionally, nondestructive seismic testing was used to evaluate stiffness profiles within the base and supporting subgrade. Spectral-analysis-of-surface-waves (SASW) tests were used for this purpose. Both the NDG and the SASW test results show that a 33-cm (13-in.)-thick layer of unbound aggregate base can be compacted as dense and as stiff as a 15-cm (6-in.)-thick layer. The seismic results also show that the upper 7.6 cm (3 in.) of all three test pads have lower stiffnesses than the bottom 25.4 cm (10 in.). This near-surface layer exhibits a lower stiffness, presumably from lower effective stresses and possibly from some disturbance caused by the compaction equipment. Also, higher moisture contents during compaction of the base yielded lower stiffnesses, even at the same in situ density. |
| 总页数： | Transportation Research Record. 1999. (1673) pp95-102 (6 Fig., 2 Tab., 7 Ref.) |
| 报告类型： | 科技报告 |
相关文献
- Practices for Unbound Aggregate Pavement Layers. National Cooperative Highway Research Program (NCHRP) Synthesis 445. A Synthesis of Highway Practice
- Practices for Unbound Aggregate Pavement Layers. National Cooperative Highway Research Program (NCHRP) Synthesis 445. A Synthesis of Highway Practice.
- SIDNEY LANIER BRIDGE, GEORGIA.
- CLOSED-CIRCUIT TELEVISION (CCTV) CAMERA TECHNOLOGY EVALUATION.
- I-75 CORRIDOR RAMP METER SIMULATION AND ASSESSMENT : NAVIGATOR GEORGIA'S INTELLIGENT TRANSPORTATION MANAGEMENT SYSTEM.
- Water Use in the Apalachicola-Chattahoochee-Flint River Basin, Alabama, Florida, and Georgia, 2010, and Water-Use Trends, 1985–2010
检索历史
应用推荐
