玄武岩纤维增强泡沫混凝土的单轴拉伸及准静态压缩性能

为研究玄武岩纤维增强泡沫混凝土的力学性能,共设计了52组试件,讨论了玄武岩纤维体积掺量和纤维长度对各密度试件的拉伸和压缩性能的影响。结果表明：玄武岩纤维可显著提高试件的抗拉峰值应力(最大提升达到737%)和峰值应变(最大提升达到833%),可有效改善中高密度试件的受拉失效模式,使其出现伪应变硬化现象,提升了试件的抗拉承载能力和变形能力。试件抗拉峰值应力和峰值应变随纤维体积掺量增大而增大,随纤维长度增长先增大后降低;另一方面,玄武岩纤维能改变试件的受压破坏模式,使其从纵向劈裂破坏转变为斜向剪切破坏和横向压溃破坏,显著提高了中低密度试件的抗压承载力和吸能能力(最大提升达到328%)。试件的吸能能力随纤维体积掺量增大而增强,随纤维长度增长先提升后降低。

Mechanical performance of basalt fiber reinforced foam concrete subjected to quasi-static tensile and compressive tests

To investigate the mechanical properties of basalt fiber reinforced foam concrete, the quasi-static tensile and compressive tests were carried out on the prepared 52 groups of specimens, and the effects of basalt fiber volume fraction and fiber length on the tensile and compressive properties of specimens with different densities were experimentally studied. The test results show that the basalt fiber could significantly improve the tensile peak stress (maximum improvement of 737%) and peak strain (maximum improvement of 833%) of specimens. Due to the appearance of pseudo strain hardening phenomenon, the basalt fiber could effectively improve the tensile failure mode of the medium and high density specimens, so as to improve the tensile bearing capacity and deformation ability of specimens. It is found that tensile peak stress and peak strain increase with increasing the fiber volume fraction, and increase first and then decrease with increasing the fiber length. Furthermore, basalt fiber could change the compression failure mode of specimens with the observed trend from longitudinal splitting failure to oblique shear failure and transverse crushing failure, resulting in significant improvement of the compressive bearing capacity and energy absorption ability of low and medium density specimens. In addition, it is observed that increasing the fiber volume content will lead to an increase in the energy absorption (maximum improvement of 328%) of the specimen, which increases first and then decreases with increasing the fiber length.