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Controlled low-strength material (CLSM) is a cementitious material, commonly a blend of portland cement, fly ash, sand, and water, that is usually flowable and self-leveling at the time of placement. It is generally used in nonstructural applications below grade where low strengths are desired. In these cases, the mature strength of the CLSM is intended to be no stronger than that of the surrounding soils.
controlled low-strength materials, flowable fill, controlled density fill
Manager, Materials Properties Research Laboratories, Energy & Environmental Research Center, University of North Dakota, Grand Forks, ND