Determining Optimal Polypropylene Fiber Dosages In Sprayed Concrete For Mining And Civil Engineering Applications

摘要

In this study, experimental investigations were carried out on polypropylene fiber (PF), steel mesh (SM) and PF+SM reinforced shotcrete (RS) panels to evaluate performance characteristics of energy absorption and load capacity. In addition to this, material cost evaluation of shotcrete mixtures for unit energy absorption and load capacity has been given. The panel tests, along with the European specification for sprayed concrete (EFNARC), were done on 18 prismatic specimens having the same mix designs and were cured for 28 days but reinforced at varying fiber dosages. Test results indicate that in terms of unit cost performance for PF, the best dosages were 2 kg/m3 and 5 kg/m3 respectively. When compared with SM, it was determined that PF is more expensive within the range of 37 - 53%.