The spread (slump flow) of SCC typically ranges from 18 to 32 inches (455 to 810 mm) depending on the requirements for the project.
The viscosity, as visually observed by the rate at which concrete spreads, is an important characteristic of plastic SCC and can be controlled when designing the mix to suit the type of application being constructed. give it significant economic, constructability, aesthetic and engineering advantages.
If needed, low dosages of viscosity modifier can eliminate unwanted bleeding and segregation.
Since its inception in the 1980s, the use of SCC has grown tremendously.
The cancellation of lateral pressure depends on a chemical effect and occurs after the end of the dormant period when the rate of cement hydration is accelerated.
Beyond the dormant period, the progressive formation of hydration products leads to the creation of a structural network, and the pore water pressure begins to drop abruptly towards negative values.
Adjustments to traditional mix designs and the use of superplasticizers creates flowing concrete that meets tough performance requirements.
The former phenomenon occurs mainly during the dormant period of cement hydration, and is significantly affected by the binder type and content.
Regardless of the binder type, the effect of increasing the binder content resulted in sharper drops in pressure.
Tests performed by Vanhove and Djelal (2002) showed a maximum pressure 64% of maximum hydrostatic pressure for a wall placed at 25 m/h from above and a maximum of 68% of maximum hydrostatic pressure for a wall placed at 19.5m/h by pumping from the bottom of the wall.
In their study, the maximum pressure was not found at the bottom of the wall but at a height of 1.5m.