Self consolidating concrete form pressure
The wall and column were filled using a concrete pump and the material had a target slump flow of 28 in. during the time of the pour and the density of the material was 151 lb/ft3. Pressure exerted by SCC on formwork over time A large reconstruction project in Peoria, Illinois involved the construction of many new retaining walls.The project is being constructed with SCC for the walls.An additional difficulty is that there are no standard methods for studying formwork pressure in the field or in the laboratory. Khayat, University of Sherbrooke Many laboratory experiments and field tests have shown that SCC pours do not generate full hydrostatic pressure at the bottom of the structure.
Thus, there is great need for better understanding of the pressures that are actually seen in cast-in-place applications in the field.
Several of these walls were instrumented with pressure gages to study the development of pressure on the formwork. One sensor was placed 1.5 ft off the bottom of the wall and the second sensor was placed 6.5 ft off the bottom of the wall.
The first hour of pouring was at a rate of 9 ft/hr, the second hour at 4.5 ft/hr and slower for the final hours.
In their study, the maximum pressure was not found at the bottom of the wall but at a height of 1.5m.
Maximum hydrostatic pressure was determined using the overall height of the structure.
The wall was created with SCC material and filled in one continuous pour lasting about seven hours.