Zhu Zhende, Zhang Cong, Meng Songsong, Shi Zhenyue, Tao Shanzhi, Zhu Duan
Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering, Hohai University, Nanjing 210098, China.
Jiangsu Research Center for Geotechnical Engineering Technology, Hohai University, Nanjing 210098, China.
Materials (Basel). 2019 Jun 13;12(12):1908. doi: 10.3390/ma12121908.
The addition of alkali-resistant glass fiber to concrete effectively suppresses the damage evolution such as microcrack initiation, expansion, and nucleation and inhibits the development and penetration of microcracks, which is very important for the long-term stability and safety of concrete structures. We conducted indoor flat tensile tests to determine the occurrence and development of cracks in alkali-resistant glass fiber reinforced concrete (AR-GFRC). The composite material theory and Krajcinovic vector damage theory were used to correct the quantitative expressions of the fiber discontinuity and the elastic modulus of the concrete. The Weibull distribution function was used and an equation describing the damage evolution of the AR-GFRC was derived. The constitutive equation was validated using numerical parameter calculations based on the elastic modulus, the fiber content, and a performance test of polypropylene fiber. The results showed that the tensile strength and peak strength of the specimen were highest at a concrete fiber content of 1%. The changes in the macroscopic stress-strain curve of the AR-GFRC were determined and characterized by the model. The results of this study provide theoretical support and reference data to ensure safety and reliability for practical concrete engineering.
在混凝土中添加耐碱玻璃纤维可有效抑制微裂纹萌生、扩展和成核等损伤演化，抑制微裂纹的发展和贯穿，这对混凝土结构的长期稳定性和安全性至关重要。我们进行了室内平板拉伸试验，以确定耐碱玻璃纤维增强混凝土（AR-GFRC）中裂纹的产生和发展。采用复合材料理论和克拉伊奇诺维奇向量损伤理论对纤维不连续性和混凝土弹性模量的定量表达式进行修正。使用威布尔分布函数并推导了描述AR-GFRC损伤演化的方程。基于弹性模量、纤维含量和聚丙烯纤维性能试验，通过数值参数计算对本构方程进行验证。结果表明，当混凝土纤维含量为1%时，试件的抗拉强度和峰值强度最高。通过该模型确定并表征了AR-GFRC宏观应力-应变曲线的变化。本研究结果为确保实际混凝土工程的安全性和可靠性提供了理论支持和参考数据。
