- Testing
- Formwork
Technical Resource:
Formwork
Pressure
Summary
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SCC exerts greater formwork pressure than normal concrete because it generally takes a greater period of time for its thixotropy to develop “self-supporting” structure in the fresh material. This self-support occurs much earlier than initial set, and is related to fresh concrete rheological behavior.
Formwork pressure can be measured by using pressure sensors mounted in formwork. Laboratory studies using PVC test columns have proven to be convenient and reliable methods for characterizing SCC behavior.
A better understanding of formwork pressure will lead to improved versions of formwork pressure models. Several formwork pressure models have been developed, and one common element is that all of the models require testing the candidate SCC and obtaining the value of a representative parameter to describe rheology, stiffening, or gelation. Such models represent great opportunity to improve prediction of formwork pressures in the field, allowing faster pour rates with greater confidence. These advances will make possible more economical construction with SCC.
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