Experimental Investigation on the Fracture Behavior of Basalt Fiber-Reinforced Shotcrete
Junbo Guo, Wei Shi, Kun Wang, Lingze Li, Dingjun Xiao
TL;DR
This study examines how basalt fiber-reinforced concrete behaves under freeze-thaw conditions and different fracture modes, finding that fiber content and crack type significantly affect its durability and strength.
Contribution
The study introduces a detailed analysis of fracture propagation in basalt fiber-reinforced concrete under freeze-thaw cycles and various crack modes.
Findings
Mode II fracture specimens show the highest effective stress (64 MPa) after crack penetration, making them hardest to propagate.
Optimal basalt fiber content is 0.35% to 0.45%, maximizing fracture toughness and freeze-thaw resistance.
Mixed-mode I/II specimens face significant propagation difficulties with a maximum effective stress of 31 MPa.
Abstract
Basalt fiber-reinforced concrete is increasingly being used in shotcrete support systems for rock mass excavation engineering due to its superior mechanical properties and durability. Rapid freeze–thaw cycling tests were performed to simulate freeze–thaw conditions in order to meticulously investigate the dynamic and static fracture behaviors of basalt fiber-reinforced concrete in freeze–thaw environments. Then, utilizing a Split Hopkinson Pressure Bar (SHPB) system and rock testing equipment, dynamic and static fracture tests were performed on developed Mode I, mixed-mode I/II, and Mode II platform Brazilian disk specimens. Under freeze–thaw conditions, the dynamic and static fracture propagation velocities of specimens with diverse crack propagation modes were determined. Based on this, LS-DYNA numerical simulations were used to perform inverse evaluations of crack propagation…
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Taxonomy
TopicsInnovative concrete reinforcement materials · Rock Mechanics and Modeling · Concrete and Cement Materials Research