Determination of the Adhesion Strength of Reinforcing Fibers to the Matrix in Fiber Concrete

The issue of determining the characteristics of the adhesion of fibers to the matrix, which is necessary for the theoretical prediction of the behavior of fiber concrete under load and determining the indicators of its crack resistance by calculation, is considered; it is also one of the values that determine the mechanism of destruction of the cement composite. The existing method for determining the characteristics of the fiber-matrix adhesion strength is presented, the effectiveness of its application is considered on the example of low-modulus synthetic fiber. The method provides for the production and testing of several series of fiber concrete samples and subsequent calculation of the strength characteristics of the adhesion of fibers to the cement matrix based on the results obtained. In this case, it is necessary to determine such a volume content of fibers, after the introduction of which there is a steady increase in the strength of fiber concrete. However, it is known that low-modulus fiber does not have a noticeable effect on the strength of fiber concrete , so determining the characteristics of its adhesion to the matrix may be difficult, which causes the need to improve the existing method and indicates the relevance of the research topic.

Yu.V. PUKHARENKO, Doctor of Sciences (Engineering), Corresponding member of RAACS (This email address is being protected from spambots. You need JavaScript enabled to view it.),
V.I. MOROZOV, Doctor of Sciences (Engineering), Corresponding member of RAACS,
D.A. PANTELEEV, Candidate of Sciences (Engineering),
M.I. ZHAVORONKOV, Candidate of Sciences (Engineering)

Saint Petersburg State University of Architecture and Civil Engineering (4, Vtoraya Krasnoarmeiskaya Street, Saint Petersburg, 190005, Russian Federation)

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