ABSTRACT
Boothroyde et al. (77) looked at the transport of colliery waste (mudstone , shale, siltstone and sandstone) in coarse slurry form, attractive from the short distances involved. They found a sliding bed to be the only feasible transport regime, and addition of fines was of benefit only when the fines themselves were required to be transported. For crushed granite transport, on the other hand, fines can have the additional benefit of reducing the impact of a serious wear problem, which could not be solved with liners (78). The separated fines suspension could be returned to the mixing (preparation) vessel in such a way as to help maintain the granite in suspension. For the dredging industry, Schaart and Verhoog (79) noted very different problems, such as prediction of the particulate properties of the dredged material. It could be dredged in consolidated lumps, unconsolidated grains or a mixture of the two extremes. They pointed to the need for a unified theory of coarse particle transport.
