Evaluation of the properties of shotcrete obtained with the use of secondary concrete
In this paper, the study of the features of the durability of the use of shotcrete with the use of secondary concrete used as a filler is carried out. Based on the studies, it was determined that the inclusion of recycled aggregates required an increase in the water/cement ratio to maintain workability in all mixtures and led to a decrease in the rebound effect, which is a very positive consequence, since this is one of the biggest disadvantages of dry mixes. the mixing process. To characterize the durability of shotcrete, the results of the following tests were analyzed: water absorption during immersion, water absorption due to capillarity, resistance to carbonation, resistance to penetration of chloride ions and shrinkage. In all of them, there was a loss of performance. However, all losses were low, which means that if you take it into account when designing shotcrete, this type of aggregates may have prospects of application.