Abstract
Self-compacting rubberized concrete (SCRC) is a high-performance concrete that can achieve compacting effect by self-gravity without vibration during pouring. Because of its excellent fluidity, homogeneity, and stability, the application of self-compacting concrete in engineering can improve work efficiency and reduce project cost. The effects of loading rate on the fracture behavior of self-compacting concrete were studied in this paper. Three-point bend (TPB) tests were carried out at five loading rates of 1, 0.1, 0.001, 0.0001, and 0.00001 mm/s. The dimensions of the specimens were 100 mm × 100 mm × 400 mm. A precast crack was set in the middle of the specimen with a notch-depth ratio of 0.4. The experimental results show that the peak load on the load-CMOD (crack mouth opening displacement) curve gradually increases with the increase of the loading rate. Although the fracture energy a presented greater dispersion under the loading rate of 1 mm/s, the overall changes were still rising with the increase of the loading rate. Besides studying the softening characteristics of the self-compacting concrete, the constitutive softening curve of the self-compacting concrete was obtained using the bilinear model. Finally, curved three-point bending beams were simulated by using the extended finite element method based on ABAQUS. The fracture process of the self-compacting concrete under different loading conditions was analyzed more intuitively. The simulation results were compared with the experimental results, and the same conclusions were obtained.
Highlights
Finite element analysis rapid development of the automobile industry has led to a sharp increase in the number of discarded tires
To study the influence of different loading rates on the peak load of concrete, the author carried out a this paper. ree-point bend (TPB) test on concrete specimens with a notch-depth ratio of 0.4 at different loading rates (1 mm/s, 0.1 mm/s, 0.001 mm/s, 0.0001 mm/s, and 0.00001 mm/s), using three specimens for each loading rate
According to the numerical simulation results, with the increase of loading rate, the peak load of the concrete beam increases, which is consistent with the test results, indicating that the bilinear softening function determined by the above method can be applied to the finite element model to predict the trend of concrete under the influence of loading rate
Summary
Finite element analysis rapid development of the automobile industry has led to a sharp increase in the number of discarded tires. To improve the crack resistance of SCC, some scholars put forward to mix rubber particles into it to enhance the performance of concrete by using the high-quality characteristics of rubber [10]. As a new kind of composite material, the research on SCRC is still in the aspects of working performance and basic mechanical properties [11,12,13,14,15,16]. Some scholars at home and abroad have studied the effect of loading rate on the mechanical properties of Advances in Civil Engineering concrete [17, 18], but few studies have been conducted on SCRC. The fracture behavior of SCRC with prefabricated cracks under different loading rates is numerically simulated. It is applied to ABAQUS to accurately predict the fracture behavior of rubber self-compacting concrete beams under different loading rates
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