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PERFORMANCE EVALUATION OF A CEMENT-STABILIZED FLY ASH BASE.
| 题名： | PERFORMANCE EVALUATION OF A CEMENT-STABILIZED FLY ASH BASE. |
| 作者： | Gray-DH; Tons-E; Thiruvengadam-TR |
| 关键词： | PERFORMANCE-EVALUATIONS; CEMENT-STABILIZED-SOIL; FLY-ASH; BASE-COURSES; SHOULDERS-; TEST-SECTIONS; IMPACT-TESTS; MOISTURE-DENSITY-TESTS; UNCONFINED-COMPRESSION-TESTS; CORES-; PAVEMENT-DEFLECTION; EDGE-BREAK-SURVEYS; CRACKS-; PATTERNS-; LEACHATES-; HEAVING-; PAVEMENT-CRACKING; FROST-EFFECTS |
| 摘要： | The performance of a compacted, aggregate-free, cement-stabilized fly ash base beneath a highway shoulder is described. A 2.7-m (9-ft) wide, 457.5-m (1,500-ft) long fly ash test section was placed on both sides of State Highway M-54 near Grand Blanc, Michigan, in May 1987. The test section base was constructed using a high carbon, Class F fly ash that was stabilized with 12% by weight portland cement. A number of tests were used to monitor and evaluate the performance of the base. These tests included (a) Clegg impact readings on the compacted surface of the fly ash, (b) moisture-density and unconfined compression tests on core samples, (c) elevation and vertical deflection measurements on the pavement, (d) edge break surveys, (e) a crack pattern analysis, and (f) leachate analyses. The results of monitoring and evaluation tests conducted to date show that in general the fly ash test section has held up reasonably well where design and compaction specifications have been met. No widespread major problems (e.g., crumbling, disintegration, excessive heave or settlement of the pavement) have occurred during the 5-year period since construction in these areas. Problems with heave and cracking of the pavement on top of the fly ash have so far been restricted to a few local areas. Heaving and cracking in these areas occur mainly during the winter and are associated with frost effects. The presence of a joint that was purposely cut in the surface wearing course between the road shoulder and traveled way on one side of the highway greatly exacerbated arcuate cracking that developed next to the joint. |
| 总页数： | Transportation Research Record. 1994. (1440) pp8-15 (2 Phot., 10 Fig., 1 Tab., 5 Ref.) |
| 报告类型： | 科技报告 |
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