Xiaojiang Deng, Mingxuan Shen, Yu Zhao, Jing Bi, Chaolin Wang, Yongfa Zhang, Yang Li, Lin Ning
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引用次数: 0
Abstract
The fracture of the concrete-rock interface poses a significant challenge in practical engineering applications, often leading to structural failure. Grouting reinforcement has been demonstrated to enhance the mechanical properties of this interface. This study systematically investigates the fracture behavior and mechanisms of defective concrete-rock interfaces under various loading angles (0°, 30°, 45°, 60°, and 90°). Gypsum- and epoxy resin-based grouting materials were utilized to fill defects in concrete-sandstone composite specimens, with subsequent Brazilian splitting tests conducted on both ungrouted and grouted samples. Real-time monitoring of micro-crack initiation and propagation in the concrete-sandstone composite Brazilian disks was achieved through synchronized acoustic emission (AE) and digital image correlation (DIC) techniques. The experimental results reveal that the peak loads for ungrouted specimens at respective loading angles are 3.4 kN, 3.7 kN, 3.9 kN, 4.4 kN, and 4.9 kN. Gypsum-grouted specimens exhibited load increases of 0.7 kN, 2.1 kN, 2.3 kN, 2.1 kN, and 2.7 kN, whereas epoxy resin-grouted specimens demonstrated significantly greater enhancements of 3.5 kN, 4.7 kN, 4.8 kN, 4.9 kN, and 4.9 kN. Notably, epoxy resin grouting substantially improves both mechanical properties and interfacial adhesion in defective concrete-sandstone composites. Three key patterns emerge in AE amplitude entropy prior to failure: Low frequency and minor variations in amplitude, low frequency and large variations in amplitude, and high-frequency and significant variation in amplitude. These findings provide critical insights for optimizing grouting reinforcement strategies and enhancing risk assessment in composite structural engineering.
期刊介绍:
Theoretical and Applied Fracture Mechanics'' aims & scopes have been re-designed to cover both the theoretical, applied, and numerical aspects associated with those cracking related phenomena taking place, at a micro-, meso-, and macroscopic level, in materials/components/structures of any kind.
The journal aims to cover the cracking/mechanical behaviour of materials/components/structures in those situations involving both time-independent and time-dependent system of external forces/moments (such as, for instance, quasi-static, impulsive, impact, blasting, creep, contact, and fatigue loading). Since, under the above circumstances, the mechanical behaviour of cracked materials/components/structures is also affected by the environmental conditions, the journal would consider also those theoretical/experimental research works investigating the effect of external variables such as, for instance, the effect of corrosive environments as well as of high/low-temperature.