Controlled low strength material, abbreviated CLSM, also known as flowable fill, is a type of weak, runny concrete mix used in construction for non-structural purposes such as backfill or road bases.

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).

CLSM is defined in Chapter 2 of the California Building Code (CBC) as “a self-compacted, cementitious material used primarily as backfill in place of compacted fill.” CLSM commonly consists of cement, …

Flowable fill, also known as controlled low strength material (CLSM), is a self-compacting, cementitious material used primarily as a backfill or void-fill alternative to traditional compacted soil.

Oct 1, 2023 · CLSM has been popularized due to its cost-effectiveness and superior performance comparison to conventional compacted fills. This study discusses the key characteristics of CLSM, …

Self-consolidating cementitious material used primarily as a backfill and as an alternative to compacted fill. soil-cement slurry. Intended to result in a compressive strength of 1,200 psi or less. Most CLSM …

CLSM may be designed to be as permeable as a uniform coarse sand or as dense as clay. CLSM proportioned with a high than normal fines content can achieve water conductivity as low as 10-1 …

CLSM is fundamentally a cementitious mixture, often referred to by contractors as “flowable fill” or “lean mix,” that is engineered specifically for low compressive strength rather than load-bearing capacity.

Flowable Fill Concrete is designed to flow easily into place without segregation and fill voids trenches and other confined spaces without the need for mechanical compaction. Once in place, it hardens …

contractor shall be responsible for the CLSM mix design. This work shall also include installation of geotextile fabric where needed or as directed by the Officer-in.