Research on High- Temperature Damage of Basalt Fiber Lightweight Aggregate Concrete
To investigate the variation laws of the mechanical properties of basalt fiber lightweight aggregate concrete (BFLAC) under high-temperature exposure, C40 lightweight aggregate concrete specimens with varying basalt fiber (BF) contents (0–0.4%) were designed. These specimens were subjected to elevated temperatures of 20, 200, 400, 600, 800, and 1000 °C, after which their residual compressive strength and residual splitting tensile strength were tested. The results indicate that the mechanical properties of all concrete groups deteriorated significantly with increasing temperature, with aggravated degradation observed above 400 °C. The incorporation of BF effectively enhanced both the compressive and tensile strengths of the concrete, with a more pronounced improvement in tensile strength; the optimal BF content was found to be between 0.2% and 0.3%. However, when the temperature exceeded 600 °C, the internal structure of the material suffered severe damage, leading to a significant reduction in the fiber reinforcement effect.
References
- ZHANG Guangtai, CHEN Hao, GUO Rui, et al. Review on High-Temperature Performance and Mechanism of Fiber Reinforced Concrete[J]. Concrete and Cement Products, 2016(1): 62-68.
- GAO Danying, LI Han, YANG Fan. High-Temperature Performance of Polypropylene-Steel Fiber Reinforced High-Strength Concrete[J]. Acta Materiae Compositae Sinica, 2013, 30(1): 187-193.
- ZHOU H, JIA B, HUANG H, et al. Experimental Study on Basic Mechanical Properties of Basalt Fiber Reinforced Concrete[J]. Materials, 2020, 13(6): 1362.
- CUI Yihua. Basic Characteristics of Continuous Basalt Fiber[J]. Journal of Textile Research, 2005(5): 120-121.
- LI Weimin, XU Jinyu. Strengthening and Toughening Effects of Basalt Fiber on Concrete[J]. Journal of the Chinese Ceramic Society, 2008(4): 476-481, 486.
- JIANG Yuchuan, HUO Da, TENG Haiwen, et al. Study on High-Temperature Performance Characteristics of Shale Ceramsite Concrete[J]. Journal of Building Materials, 2013, 16(5): 888-893.