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material for foundations, changing the cementitious and aggregate
proportions may increase the strength.
3. Unlike conventional backfilling methods, no tamping or vibration is
required to place CLSM.
4. Long-term settlement is virtually nonexistent. Except for the initial
shrinkage settlement of less than ⅛ inch per foot, there is no additional
settlement after hardening. Hence, on pavement repairs and similar
applications, a smoother ride can be expected.
5. There are substantial cost savings in using CLSM slurry, when compared
to labor intensive conventional methods of backfilling. Fly ash slurry does
not need compaction or vibration.
6. Utilizing fly ash for this application is making beneficial use of a coal
combustion product, which is helpful to the environment. It preserves sand
and gravel pits, crushed stone quarries, valuable landfill space; saves land
that would be otherwise dedicated for these uses; and contributes to
sustainable development by completely utilizing this resource and
preserving virgin materials for future generations.
Figure 5-18: Volumetric mixer used for production of fast setting and excavatable CLSM in
the Chicago area.
157 We Energies
Coal Combustion Products
Utilization Handbook