Toward mix design for rheology of self-compacting concrete

Self-compacting concrete (SCC) can produce much higher fluidity with no occurrence of segregation, thanks to its lower yield value and higher viscosity than conventional concrete. However, the fresh property of SCC cannot be evaluated by conventional consistency test such as slump test. It must be evaluated from the rheological point of view, of which SCC is considered as a Bingham plastic fluid with two parameters, the yield value and plastic viscosity. A new type of rheometer was developed to measure these two parameters and experimental works were conducted on the imitative concrete as well as the real one, in which the rheological properties of the matrix and the volume fraction of aggregates were variously changed. The result of this research allow us to develop an important parameter in establishing a new mix design method for the SCC.