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Controlled low strength material, CLSM, was not used by state transportation agencies until recently, although its use in general construction dates back to the early 1970's. The documentation of its present inclusion by many states is important in the progress of the technology of this relatively new material. States surveyed include Alabama, Florida, Georgia, North Carolina, South Carolina, and Virginia. The individual specifications are reviewed and compared. Testing methods are also discussed, along with representative data from laboratory and field test reports. Finally, a composite specification is suggested based on the consensus of the ones reviewed.
Flowable fill, flowable mortar, controlled low-strength material, backfill, fly ash
Director of Technical Services, Monex Resources, Marietta, GA
Director of Marketing, Blue Circle Williams, Marietta, GA