A method in which a stream (5) of dry cementitious powder passes through a first conduit and aqueous medium stream (7) passes through a second conduit to feed a slurry mixer (2) to make cementitious slurry (31). The cementitious slurry (31) passes through a third conduit and a reinforcement fiber stream (34) passes through a fourth conduit to feed a fiber-slurry mixer (32) which mixes the slurry (31) and discrete fibers to make a stream of fiber-slurry mixture (36). An apparatus for performing the method is also disclosed.