n Journal of the South African Institution of Civil Engineering = Joernaal van die Suid-Afrikaanse Instituut van Siviele Ingenieurswese - Development towards a proposed compressive strength test for rubble rock masonry : technical paper




Knowledge of the strength and failure characteristics of rubble rock masonry has been identified as a prerequisite to the widespread adoption of its use in RDP projects. Traditional 100 mm and 150 mm cube tests cannot accommodate even the smallest stones used in this composite and are therefore not appropriate. Lack of a existing large-scare testing procedure necessitates innovation of a reference test. Evolutionary research work towards a reference testing procedure for quantifying the unconfined compressive strength of rubble rock masonry is described. A 500 mm specimen cube size was found to be the most realistic compromise between being representative of this material and manageable. This specimen size is proposed for adoption as a reference test for making meaningful comparisons between series of specimens. Some important parameters found to influence the strength are identified and practical steps to control them are discussed.


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