Support fluid is a temporary construction material with a structural function during diaphragm-wall and barrette excavation. It must stabilize the open panel, remain manageable through treatment and cleaning, and finally be displaceable by tremie concrete.

Three system architectures

ALKABEN provides the conventional mineral route. POLYWELL and DRILL-WELL provide polymer routes. Engineered blends can combine mineral retention with polymeric soil-control functions where qualified.

Diaphragm walls are not simply large bored piles

Long rectangular panels, large exposed wall area, grabs/hydromills, large slurry volumes, reinforcement cages and long concrete operations make slurry treatment a major production system.

Bentonite route

Strong familiarity, mineral interface/filter-cake behaviour and established treatment plants can be advantages. The challenge is keeping reused slurry clean enough through repeated excavation.

Polymer route

Low mineral-solids loading and simpler preparation can reduce plant/disposal burden, but polymer-specific trial, QC and bottom-cleaning procedures are essential.

Final readiness

Whatever the fluid, the sequence is mix → excavate → maintain head → control solids → clean panel/joints → install reinforcement → condition final slurry → concrete.

See the bentonite diaphragm-wall guide and polymer diaphragm-wall guide.