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Shotcrete from a Performance Based Perspective

AutorRío, Olga; Fernández Luco, Luis; Castillo, Ángel
Palabras claveShotcrete
sprayed concrete
performance-based characterization
Fecha de publicación9-jun-2010
ResumenShotcrete or sprayed concrete for tunnelling is a structural concrete whose quality depends on the same factors as conventional concrete used for structurallinings and other issues related to the execution process, i.e., pumping and projection [1, 3]. Although present design and control tools, based mainly on a prescriptive approach [3-19], permits to ensure in some way an adequate quality, results are ascertain and mix design procedures do not provide "a priori" sound information on mechanical and durability related properties [20-21]. Moreover. prescriptive approaches and a too-tight regulatory environment (mainly prescriptive or deemed-to-satisfy rules [3-18]) are not innovation- friendly [22-23]. Performance Base Approach is attracting research interest in different areas [25-32] due to it allows, among others, for a more comprehensible specification and design process and it integrates the quality control procedures under the same concept [20-21]. PB approach directly related to the actual performance for a determined purpose or its "fitness for use". Under a PB approach, the design process is in verted and so, the starting point is the actual definition of requirements for the material, process, structure or structural element. This paper deals with the application of a PB approach to characterisation of shotcrete for tunnelling were also main advantages will be highlighted.
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