Rao Lan, Wang Ling, Zheng Yun
School of Civil Engineering, Xi'an University of Architecture & Technology, Xi'an 710055, China.
School of Civil and Architectural Engineering, Kaifeng University, Kaifeng 475004, China.
Materials (Basel). 2022 Feb 26;15(5):1762. doi: 10.3390/ma15051762.
In this paper, the mechanical properties of coral concrete with different strength and different polyvinyl alcohol (PVA) fiber content under compression were experimentally investigated. The results show that adding an appropriate amount of PVA fiber could obtain satisfactory mechanical properties of coral concrete. The stress-strain constitutive relationship of plain and PVA fiber-reinforced coral concrete was investigated by prism uniaxial compression test. The results shown that the incorporation of PVA fiber had a significant effect on limiting the development of concrete internal cracks, and effectively improved the mechanical properties of coral concrete after cracking, especially the toughness. Different constitutive models from previous research were used to describe the axial compressive stress-strain relationship of plain and PVA fiber-reinforced coral concrete, and a piecewise function model was finally selected which is most consistent with the experimental curve and its characteristic points. In addition, determination of critical parameters for the selected constitutive model was proposed, and experimental validations confirmed its accuracy.
本文通过试验研究了不同强度和不同聚乙烯醇（PVA）纤维掺量的珊瑚混凝土在受压状态下的力学性能。结果表明，掺入适量的PVA纤维可使珊瑚混凝土获得令人满意的力学性能。通过棱柱体单轴压缩试验研究了素珊瑚混凝土和PVA纤维增强珊瑚混凝土的应力-应变本构关系。结果表明，PVA纤维的掺入对限制混凝土内部裂缝的发展有显著作用，并有效改善了珊瑚混凝土开裂后的力学性能，尤其是韧性。采用以往研究中的不同本构模型来描述素珊瑚混凝土和PVA纤维增强珊瑚混凝土的轴向压缩应力-应变关系，最终选择了与试验曲线及其特征点最吻合的分段函数模型。此外，还提出了所选本构模型关键参数的确定方法，试验验证证实了其准确性。
