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MIX DESIGN FOR FLOWABLE FILL.
| 题名： | MIX DESIGN FOR FLOWABLE FILL. |
| 作者： | Bhat-ST; Lovell-CW |
| 关键词： | FLOWABLE-FILLS; CONTROLLED-LOW-STRENGTH-MATERIALS; FLOWABILITY-; HARDENING-; ULTIMATE-STRENGTH; MIX-DESIGN; FLY-ASH; WASTE-SANDS |
| 摘要： | The grout-like material called flowable fill has experienced new popularity, particularly the controlled low-strength material variety, which is easily excavated. The properties ordinarily desired of the mix are: (a) flow under gravity; (b) hardening for early walkability and cover; and (c) ultimate strength low enough to allow ready excavation. Flowability of fresh material is evaluated in a simple spread test. Hardening is measured by a mortar penetrometer, and these values are correlated with unconfined compressive strength. It is desirable to keep the ultimate strength to less than 1,035 kPa (150 lbf/sq in.); somewhat less target strength is selected for the 28-day value. Mix design is empirical, but the time and expense required may be reduced by following a rational and logical procedure, which is described. The materials emphasized in this paper are Class F coal combustion fly ash and waste sands from greensand ferrous castings. |
| 总页数： | Transportation Research Record. 1997. (1589) pp26-28 (2 Fig., 3 Ref.) |
| 报告类型： | 科技报告 |
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