Workability of CRC

CRC is thixothropic, which means it responds well to vibrations. A slump test is not very well suited for measuring the workability of CRC, but as the slump test is universally known and very simple to perform, the effect on slump of varying the content of fibres is shown in the following pictures. Shimizu, Japan carried out tests with fibre contents of 2, 6 and 9% by volume. 6% by volume corresponds to about 450 kg per m3. Shown in the pictures below are results of a slump test on the 2% and the 6% mix. A 2% mix has been used for most pre-cast applications while a 6% mix is used for CRC JointCast applications.