Flowable fill is a controlled low-strength material made of cement, flyash, water, sand, and typically an air-entraining admixture. It is gaining greater acceptance for many uses including backfilling, trenches, mud jacking, pipe bedding, road bases, floor slab bases, underground storage tanks, and many other applications.
Flowable fill easily enters difficult access areas, provides a relatively uniform compaction density, is self-leveling, and requires minimal crew and equipment for application. The versatility in design of the flowable fill mixtures offers numerous advantages to the specifying engineer.
For more information on flowable fill, please go to http://www.flowablefill.org