Q.: Someone told us that fiber balling that occurs in mixing steel fiber concrete is a thing of the past. How has the leopard changed its spots?
A.: Balling seems not to be a problem with fibers that have any of several special shapes. Some of these are:
- fibers with a crescent-shaped cross-section and with crimpings running across them
- fibers that have their ends deformed and that are temporarily held together side by side by a water-soluble glue that allows them to break apart individually during mixing
- fibers that have widened ends
- Such fibers also tend to anchor themselves well in the hardened concrete.