Application of Lightweight Fiber-Reinforced Concrete for Shaft Lagging

The article examines the possibility of using fiber-reinforced expanded clay concrete as a material for shaft lagging. The relevance of the topic is determined by the need to increase the strength, crack resistance, and durability of supports in underground mine workings. The aim of the study is to develop lightweight concrete on a porous aggregate with dispersed reinforcement, possessing optimal physical and mechanical properties for operation under mining conditions. The paper presents a comparative analysis of traditional and lightweight concrete mixes, justifies the choice of expanded clay as an aggregate, and fiber reinforcement for improving tensile strength in bending. The methodology includes laboratory tests of various compositions for strength, density, and water absorption. The main results showed that the introduction of fibers significantly improves crack resistance and strength of lagging without increasing the weight of the structure. The study confirmed the feasibility of using fiber-reinforced expanded clay concrete to ensure efficient and cost-effective support in mining conditions. The practical significance of the work lies in the possibility of introducing the developed compositions into the construction processes of the mining industry in order to extend the service life of structures and improve work safety.