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Founded in 1904 and headquartered in Farmington Hills, Michigan, USA, the American Concrete Institute is a leading authority and resource worldwide for the development, dissemination, and adoption of its consensus-based standards, technical resources, educational programs, and proven expertise for individuals and organizations involved in concrete design, construction, and materials, who share a commitment to pursuing the best use of concrete.
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Home > Tools > Frequently Asked Questions
Q. Where should a controlled low-strength material be used? A. A controlled low-strength material (CLSM) is a self-consolidating, cementing material used primarily as a backfill as an alternative to compacted fill (ACI 229R). Several terms have been used to describe this material, including flowable fill, unshrinkable fill, controlled density fill, flowable mortar, plastic soil-cement, and soil-cement slurry; however, the correct terminology is controlled low-strength material. CLSM is intended to result in a compressive strength of 1200 psi (8.3 MPa) or less. References: SP-1(02); ACI 229R-13; ACI 230.1R-09; SP-150; ACI CT-23 Topics in Concrete: CLSM; Concrete Fundamentals; Materials; Soil Cement
Q. Where should a controlled low-strength material be used?
A. A controlled low-strength material (CLSM) is a self-consolidating, cementing material used primarily as a backfill as an alternative to compacted fill (ACI 229R). Several terms have been used to describe this material, including flowable fill, unshrinkable fill, controlled density fill, flowable mortar, plastic soil-cement, and soil-cement slurry; however, the correct terminology is controlled low-strength material. CLSM is intended to result in a compressive strength of 1200 psi (8.3 MPa) or less.
References: SP-1(02); ACI 229R-13; ACI 230.1R-09; SP-150; ACI CT-23
Topics in Concrete: CLSM; Concrete Fundamentals; Materials; Soil Cement
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