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USE OF HYDRATED FLY ASH AS A FLEXIBLE BASE MATERIAL.
| 题名： | USE OF HYDRATED FLY ASH AS A FLEXIBLE BASE MATERIAL. |
| 作者： | Senadheera-SP; Jayawickrama-PW; Rana-ASMA |
| 关键词： | FLY-ASH; HYDRATED-FLY-ASH; BASE-COURSES; TEST-SECTIONS; TEXAS-; COMPRESSIVE-STRENGTH; LABORATORY-STUDIES; WATER-CONTENT; MICROSCOPIC-INVESTIGATIONS; HYDRATION-PRODUCTS; CURING-; CALCIUM- |
| 摘要： | Common uses for fly ash, such as soil stabilization and cement replacement, account for less than 20% of the fly ash produced in the United States. Therefore, finding other bulk uses for fly ash is important. One such potential application is hydrated fly ash as a base material. The Texas Department of Transportation (TxDOT) is working to produce specifications to incorporate hydrated fly ash as a flexible base material. High-calcium Class C fly ash has a self-hydrating capability in the presence of moisture. Class C fly ash produced from coal power plants using lignite and subbituminous coal is mixed with water, dumped in large pits, and left to hydrate for a period of 3 to 6 weeks. The result is a hard, homogeneous mass of hydrated fly ash that can be mined to produce a construction aggregate much like limestone. TxDOT has used this material on several test projects. It has a desirable compressive strength, but in some instances its adhesion to seal coats has been a problem. Laboratory studies indicate that hydration water content has a significant influence on its strength. Microscopic investigations on hydrated Class C fly ash indicate that the hydration products may depend on the curing conditions. Hydrated Class C fly ash has a potential as a flexible base material provided that the curing process is carefully managed. |
| 总页数： | Transportation Research Record. 1996. (1546) pp53-61 (12 Phot., 2 Fig., 5 Tab., 4 Ref.) |
| 报告类型： | 科技报告 |
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