Research on Bonding Properties of Fiber and Cement Mortar Interface

Abstract

Abstract: In this paper, a single coarse fiber pull-out test was carried out on a “figure-eight” specimen. Types of fibers, diameters of fibers, embedding lengths of fibers and water-binder ratio of mortar matrix were considered in the mixed orthogonal experiments to study the significant priority of the bond strength as well as the best combination between fiber and mortar matrix. Besides, the maximum fiber pull-out load and load-slip curves were obtained. The interface bonding performance of fiber and cement mortar matrix was systematically analyzed. The test results show that the interface bond strength of the polypropylene coarse fiber with a diameter of 0.6 mm and an embedded length of 20 mm to a mortar matrix with a water-binder ratio of 0.51 is the largest. The average bond strength of that is 7.71 MPa and the equivalent bond strength is up to 13.25 MPa. The interface bond strength of mortar matrix with polyvinyl alcohol (PVA) fiber with a diameter of 0.6 mm, an embedded length of 10 mm and a water-binder ratio of 0.41 is second. The priority of the influence of the four factors on the bond strength of the interface is fiber type, fiber diameter, water-binder ratio of mortar matrix and embedded length of fibers. The fiber type has a significant effect on the average bond strength of the interface, and the fiber diameter has a significant effect on the equivalent bond strength of the interface.

Key words: fiber reinforced concrete, steel fiber, synthetic fiber, interface, bond strength of interface, single coarse fiber pull-out test, load-slip diagram, significance

CLC Number:

TQ177.62

ZHANG Xianmin, CHEN Xuefang, LI Changhui, HUO Haifeng, CHEN Yu. Research on Bonding Properties of Fiber and Cement Mortar Interface[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(12): 3927-3937.

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