Abstract: The orientation and distribution of the fiber in the concrete matrix and the contact point of the fiber are the important factors affecting the mechanical properties of fiber reinforced concrete, and they are also the weak links in the current research. In this experiment, the enhancement mechanism of fiber content on (BFRC) triaxial mechanical properties of basalt fiber reinforced concrete is studied. CT technology and search cone algorithm are used to obtain and identify BF. The changes of BF distribution angle, efficiency index and contact point at 1.5 kg/m3, 3 kg/m3 and 4.5 kg/m3 are analyzed, and the enhancement mechanism of fiber morphology on BFRC mechanical properties is revealed. The results show that the fiber content remains unchanged, and the peak stress increases with the increase of confining pressure; the confining pressure remains unchanged at 2 MPa, and with the increase of fiber content, the peak stress of the material increases at first and then decreases, and the optimum content is 3 kg/m3, when the peak stress is 44.48 MPa, which is 99.64% higher than that of ordinary concrete. After fiber trac-king, it is found that the fibers are distributed randomly in the concrete matrix; under the azimuth of the Z axis of the Cartesian coordinate system, there are more fibers in the range of 80—90°, and the fibers tend to be placed horizontally, approximately perpendicular to the vertical cracks; under the azimuth, there are more fibers in the range of 30—50°, which is the most favorable for controlling oblique cracks. The fiber efficiency index (eiy) with different content is 0.57,0.65 and 0.55 respectively, which further indicates that the fiber tends to be parallel to the Y axis. With the increase of fiber content (1.5 kg/m3, 3 kg/m3, 4.5 kg/m3), the fiber contact rate is 0%, 25% and 49% respectively, and the fiber agglomeration phenomenon is more obvious. The triaxial strength of 26.63 MPa, 44.48 MPa, 42.43 MPa, fiber contact affects the triaxial mechanical properties of BFRC to a certain extent.
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2021, Vol. 35 
