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Prediction of pumpability and injectability of wet mixed shotcrete based on rheological properties

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Document pages: 9 pages

Abstract: The purpose of this study is to evaluate the pumpability and sprayability of wet mix shotcrete (WMS) made of crushed aggregate and various admixtures such as silica fume, fly ash, ground blast furnace slag (GGBFS), metakaolin and steel fiber. IBB rheometer is used to measure the rheological properties of fresh shotcrete, such as flow resistance and torque viscosity. The results show that satisfactory pumping performance can be obtained by using silica fume and metakaolin, but the mixture containing fly ash and steel fiber can not meet the pumping standard under normal pumping pressure. The accumulation thickness (an indicator of shotcrete sprayability) is expected to vary   mm between 68 and 218, demonstrating the use of admixtureslted in a wide spectrum of shootability. In particular, the use of metakaolin was found to substantially increase the predicted build-up thickness only with a small replacement. The findings of this study are expected to be used as an easy-to-use guideline for estimating pumpability and shootability of WMS when no compliance testing data is available.

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