ABSTRACT
Abstract This paper describes a research programme aimed at advancing the understanding and technology of the wet process to enable it to be specified and used with confidence for repair applications in the United Kingdom. In particular it describes the results of an industrial survey on repair contract characterisitics and initial trials on the workability (the two-point shear vane type) and pumpability of several mixes. The results demonstrate the low dependance on operator skill and the crucial effect of the aggregate grading with rotor stator type equipment. Keywords: repair, rheology, spraying process, wet mix, wet process 1 Introduction
Currently, sprayed concrete repair projects in the UK are almost exclusively carried out by the dry process. The wet process has become dominant for large scale tunnelling applications involving robot-controlled spraying (e.g. in Scandinavia and more recently in the UK with the New Austrian Tunnelling Method or NATM), but is not a common solution for repair work.
