Study on Damage Evolution and Stress-Strain Constitutive Relationship of Glass Fiber Recycled Concrete Under Complex Stress State
CHEN Yuliang1,2,3,*, WANG Shuangyi1, LI Hong1, LI Peize1
1 School of Civil Engineering and Architecture, Guangxi University of Science and Technology, Liuzhou 545006, Guangxi, China 2 Guangxi Engineering Research Center for Safety Prevention and Control of Assembly Structure, Guangxi University of Science and Technology, Liuzhou 545006, Guangxi, China 3 Key Laboratory of Disaster Prevention & Mitigation and Prestress Technology of Guangxi Colleges and Universities, Guangxi University of Science and Technology, Liuzhou 545006, Guangxi, China
Abstract: To explore the performance of glass fiber recycled concrete ( GFRAC ) in triaxial compression mechanics through conventional triaxial compression tests, here 168 glass fiber recycled concrete cylinder specimens of 100mm ( diameter ) × 200mm ( height ) were designed with glass fiber volume content V, recycled coarse aggregate replacement rateγ and lateral confining pressure σw as variable parameters. The failure characteristics of GFRAC specimens were obtained by experiments, and the influence of different parameters on peak stress, peak strain and elastic modulus was analyzed. The results showed that with the increase of lateral confining pressure, the failure mode of GFRAC gradually changed from longitudinal splitting failure to oblique shear failure, the grid cracks gradually increased and covered specimens, and the ‘waist drum’ deformation occured at the middle or end of the specimen. The peak stress, strain and elastic modulus of GFRAC could be effectively increased by applying lateral confining pressure. The glass fiber could enhance the peak stress of the specimen and the increased range was less than 20%. Increasing the replacement rate of recycled coarse aggregate resulted in the decrease of peak stress and elastic modulus, with the maximum decrease of 19.17% and 34.91%, respectively, while the peak strain increased with the maximum increase of 76.77%. Both lateral confining pressure and glass fiber should effectively delay the damage process of the specimen. Finally, based on the experimental data, the stress-strain constitutive relationship of glass fiber recycled concrete under triaxial compression was established.
陈宇良, 王双翼, 李洪, 李培泽. 复杂应力状态下玻璃纤维再生混凝土损伤演变及应力-应变本构关系研究[J]. 材料导报, 2024, 38(24): 23080024-9.
CHEN Yuliang, WANG Shuangyi, LI Hong, LI Peize. Study on Damage Evolution and Stress-Strain Constitutive Relationship of Glass Fiber Recycled Concrete Under Complex Stress State. Materials Reports, 2024, 38(24): 23080024-9.
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2024, Vol. 38 
