Controlled Low Strength Material (CLSM)
Controlled 
Low strength material (CLSM)
It is a cementations fill that is in a flow able state at the time of placement and has limited compressive strength since according to the standards its strength is no greater than 8.3 n/mm2.
It can be used in:
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backfilling utility trenches
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filling abandoned underground structures
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retaining walls
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Roadway backfilling
