Effect of Fiber-Based Distribution on the Bending Properties of Cement-Based Materials

  • Xiongzhou Yuan, Qinglin Liu, Weiting Xu

Abstract

With the advancement and development of technology, various complex concrete structures have emerged in an endless stream, making construction more and more difficult. The presence of fibers can improve the concrete's weak tensile properties and poor bending resistance, so it is widely used in practical engineering. Therefore, the exploration of the mechanical properties and constitutive relations of fiber concrete is a very important topic. The flexural properties of polyvinyl alcohol (PVA) fiber reinforced cement based materials are related to the distribution and orientation distribution of fibers in the cement matrix. The microscopic imaging method of phosphor powder after polishing section was used to quantitatively determine the distribution and orientation distribution of PVA fiber in cement-based materials based on the multimedia program. The mechanism of fiber structure distribution affected by different matrix structure characteristics was discussed. Through the multimedia technology, combined with the bending test results, the effects of fiber distribution and orientation distribution on the bending properties of the material were studied. The results of fiber distribution measurement show that the uniform matrix structure characteristics are beneficial to the distribution of fibers. At the same time, for the specimens with the same material composition and processing process, the larger the fiber distribution coefficient, the greater the bending strength and toughness of the specimens; the fiber orientation distribution The measurement results show that the fibers distributed in the disordered direction have a higher probability of distribution when the angle between the longitudinal direction and the polishing surface is close to 90°, and the bending toughness of the test piece is also larger.

Published
2019-07-29