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

doi:10.11896/cldb.23080024

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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 σ_w 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.

Key words： three-dimensional complex stress glass fiber recycled concrete mechanical properties constitutive relation damage analysis

Published: 25 December 2024 Online: 2024-12-20

CLC number:

TU528.58

Fund:National Natural Science Foundation of China (52368013, 51908141), Guangxi Key Research and Development Project (Guike AB23075196), Project to Improve the Basic Scientific Research Ability of Young and Middle-aged Teachers in Guangxi Universities(2022KY0348).

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	CHEN Yuliang
	WANG Shuangyi
	LI Hong
	LI Peize

Cite this article:

CHEN Yuliang,WANG Shuangyi,LI Hong, et al. Study on Damage Evolution and Stress-Strain Constitutive Relationship of Glass Fiber Recycled Concrete Under Complex Stress State[J]. Materials Reports, 2024, 38(24): 23080024-9.

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http://www.mater-rep.com/EN/10.11896/cldb.23080024 OR http://www.mater-rep.com/EN/Y2024/V38/I24/23080024

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