| Citation: |
LI Baodi, CUI Zhenglong, GAO Minghao. Experimental study on fracture performance of coal gangue coarse aggregate concrete reinforced by multi-factor synergy[J]. Acta Materiae Compositae Sinica.
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The resource utilization of coal gangue is in line with the concept of green development in China, but the practical engineering application of coal gangue concrete is limited due to the low strength and high water absorption rate of coal gangue aggregate. In order to improve the utilization rate of coal gangue in engineering, expand its application scope in engineering, improve the characteristics of brittle failure of coal gangue concrete, and reduce the potential safety hazards caused by the use of coal gangue concrete in engineering, it is necessary to strengthen coal gangue and improve the fracture performance of coal gangue coarse aggregate concrete.
In this paper, coal gangue aggregates were strengthened by four intensification methods: cement slurry wrapping method (GC), water glass immersion method (SC), cement slurry-carbonization synergistic strengthening method (GT) and cement slurry-sodium silicate synergistic strengthening method (GS). In order to explore the effect of aggregate strengthening on the fracture properties of coal gangue concrete, crushed stone concrete (NC) and non-reinforced coal gangue concrete (MC) were used as the control group, combined with digital speckle DIC technology. 515mm×100mm×100mm three-point bending specimens are made with 6 kinds of aggregates, 3 in each group, and prefabricated cracks are reserved in the middle part with a T-shaped steel plate with a height of 40mm and a thickness of 3.5mm when the specimens are poured. After 28 days of standard curing of the specimen, an artificial speckle field was made within 3cm of the left and right sides of the prefabricated cracks, and the loading equipment adopted the displacement loading method, and the loading speed was 0.1mm/min. During loading, digital speckle instrument, displacement gauge and clip-on extensometer were used to collect data from the specimen. The collected data were calculated by using the double-K fracture model to obtain the fracture parameters of concrete. Finally, the accuracy of DIC technology is verified by comparing the simulated values analyzed by DIC software with the test values measured by displacement meter and extensometer.
Compared with ordinary coal gangue aggregates, the water absorption, apparent density and crushing index of the strengthened coal gangue aggregate were improved, indicating that the strengthening method had an enhanced effect on the basic physical and mechanical properties of coal gangue. When the specimen is damaged, the gravel concrete presents the phenomenon that the mortar peels off the coarse aggregate of the gravel and the surface of the gravel is intact. The coal gangue concrete shows the phenomenon of aggregate crushing, which is caused by the original cracks in the process of coal gangue mining and crushing, and this phenomenon is significantly improved in the test pieces of the reinforcement group. The coal gangue aggregate wrapped in the cement slurry was polished, the surface slurry was removed, and the aggregate was scanned sub-microscopically, and the original pores and cracks of the cement slurry filled with the aggregate could be found.Conclusions: (1) Cement slurry wrapping, water glass immersion, cement slurry-water glass synergistic strengthening and cement slurry-carbonization synergistic strengthening play a certain role in delaying the crack initiation and propagation of coal gangue concrete, and enhance the toughness of concrete. Among them, the cracking toughness and instability toughness of the cement slurry-carbonization synergistic strengthening group increased the most, by 25.0% and 36.21%, respectively, and the improvement of concrete fracture performance was more obvious. (2) The curve measured by the digital image correlation method (DIC) and the displacement extensometer has a high degree of agreement, and most of the errors are less than 5%, indicating that the DIC method has high accuracy in the fracture test of gangue concrete. (3) The four strengthening methods all improve the fracture energy and ultimate strain of the gangue concrete, enhance the energy consumption capacity of the gangue concrete when it breaks and improve the fracture performance. Among them, the synergistic strengthening effect of cement slurry and carbonization was the most significant, and the fracture energy was increased by 17.94%.
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