Current Status of Research on Direct Tensile Testing Methods for Fiber Concrete

Abstract

Due to the weak tensile strength of traditional concrete, relatively few concrete direct tensile tests (DTT) have been carried out for a long time, and many specifications and standards do not provide detailed guidance on its operation process. It was not until the birth of steel fiber concrete materials such as SFRC that the research on the tensile properties of SFRC was developed. There are three commonly used test methods to measure the tensile strength of concrete, namely: splitting tube test; (2) beam deflection test; (3) direct tension test. The first two tests do not give true tensile strength because the tensile stress is indirectly applied to the specimen. Only direct tensile testing can obtain the true tensile strength under uniform uniaxial tension. So far, domestic and foreign academic circles have not unified the form of steel fiber concrete and concrete axial tension test specimens and the axial tension test method, making the test results quite scattered. First, this article summarizes the direct tension methods currently used in fiber concrete, secondly compares the advantages and disadvantages of various direct tension test methods, and finally looks forward to the phased results and shortcomings of current research.