Concrete for Tunnel Liners:Pumpable Fiber Reinforced Concrete.

摘要

This study was undertaken to develop a procedure for designing fiber reinforced concrete mixes that may be delivered by pumping and to provide information on this method for applications in tunnel liners. The presence of fibrous reinforcement in the concrete increases the harshness of the mix and,therefore,increases the complexity of pumping problems. However,by selecting combinations of fine aggregates,coarse aggregates and fibers which result in a minimum volume of voids and providing a paste content slightly in excess of the voids,fiber reinforced concretes can be pumped. Mixes with four different maximum sizes of aggregate were found to be pumpable when evaluated in the laboratory.