Acceptable slump for self consolidating grout dating when to be naughty
The VSI is established based on whether bleed water is observed at the leading edge of the spreading concrete, or if aggregates pile at the center.
VSI values range from 0 for “highly stable” to 3 for unacceptable stability.
Coarse grout contains aggregate up to 3/8” size and is an economical mix commonly used for reinforced masonry construction.
See the Building Code Requirements and Specification for Masonry Structures Specification Table 7 for grout space requirements.
This led to the development of self-compacting concrete, primarily through the work by Okamura. The first usable version of self-compacting concrete was completed in 1988 and was named “High Performance Concrete”, and later proposed as “Self Compacting High Performance Concrete”.
In Japan, the volume of SCC in construction has risen steadily over the years.
is a concrete mix which has a low yield stress, high deformability, good segregation resistance (prevents separation of particles in the mix), and moderate viscosity (necessary to ensure uniform suspension of solid particles during transportation, placement (without external compaction), and thereafter until the concrete sets).
The resistance to segregation is observed through a visual stability index (VSI).However it is laborious and takes time to remove by vibration, and improper or inadequate vibration can lead to undetected problems later.