Damage Model of Shear Beam of Basalt Fiber High-strength Desert Sand Concrete Based on Acoustic Emission and Fractal Theory.

Desert sand from Xinjiang was used as fine aggregate to partially replace engineering sand, and basalt fiber was mixed into concrete to make 9 high-strength desert sand concrete beams with different shear span ratios, basalt fiber content and different hoop ratios. Shear failure tests were carried out by two-point symmetric loading. Based on acoustic emission technology and fractal theory, the damage evolution process of shear beams was studied, and the law between the damage evolution of shear beams and different variable factors was quantitatively analyzed. The results show that the cumulative acoustic emission energy increases exponentially with the failure process of the beam. The energy parameters and the fractal dimension of the beam surface crack increase with the increase of the load level, and the maximum fractal dimension reaches 1. 206. Under the same load level, the damage of the beam is the least when the shear span ratio is 1. 5 and the fiber content is 0. 4%. Based on acoustic emission parameters and fractal dimension of cracks on the test beam surface,a shear damage model is established. [ABSTRACT FROM AUTHOR]