Analysis of Real Time Technical Data Obtained While Shotcreting: An Approach Towards Automation

Abstract

Automation of shotcreting process is a key factor in both improving the working conditions and increasing productivity; as well as in increasing the quality of shotcrete. The confidence in the quality of the automation process itself and shotcrete linings can be improved by real time monitoring of pumping as well as other shotcreting machine related parameters. Prediction of how the difIerent technical parameters of application are governing the whole process is being a subject of increasing interest. In present communication a study is made on how to approach their analysis by using some novel sensing technologies for ensuring both to fit the required layer characteristics as well as a less dispersions on the results. The main advantage is that sensors directly installed on the shotcreting machine as well as Ladar systems are relatively inexpensive non destructive measuring means that can be used also for routine quality control. Sensors on the sprayed machine can be used for detecting the pumping needs for a given mix and therefore to regulate pumping (concrete flow) accordingly. Regarding sensing techniques based on Ladar technology, they can be used for a precise measurement of layer thickness that it is of utmost importance not only for technical but for economical reasons as well but also for governing shotcrete machine arm in order to obtain a layer with good compactness and minimise rebound.