A concrete performance test device under axial tensile stress

Abstract

The invention discloses a device for testing the performance of concrete under axial tensile stress, belonging to the field of test of durability performance of concrete and aiming at solving the problems of high probability of eccentric tensile stress and stress relaxation of a current testing device in the testing process. According to the main technical scheme disclosed by the invention, the device comprises a base plate, a connection base, a first pull head, a middle pressure plate, an upper pressure plate, a pull rod and a disc spring, wherein at least four stand columns are fixedly connected to the base plate; the connection base is fixed in the middle of the base plate; the first pull head is hinged onto the connection base and is capable of rotating around the connection base; the stand columns penetrate through the middle pressure plate and the middle pressure plate is fixed at limit points of the stand columns; the stand columns penetrate through the upper pressure plate; the pull rod passes through through holes in the middle pressure plate and the upper pressure plate; one end of the pull rod is connected with a spherical joint which is connected with a second pull head, and the other end of the pull rod is connected with a nut in a screwed manner; the disc spring is arranged on the pull rod in a sleeving manner and positioned between the middle pressure plate and the upper pressure plate; one end of a concrete sample is connected with the first pull head, and the other end of the concrete sample is connected with the second pull head.

Description

technical field [0001] The invention belongs to the field of concrete durability testing, in particular to a concrete transmission performance testing device under axial tensile stress. Background technique [0002] The durability of concrete is closely related to its service life. Practice has proved that the degradation of concrete durability is the result of the joint action of load and environmental factors. Mechanical loads will cause internal damage to concrete, thereby accelerating the erosion of erosive media in the environment, and erosion damage will intensify mechanical damage, thereby accelerating the deterioration process of concrete. . [0003] In the prior art concrete water permeability test device under tensile stress, the device uses the reaction force of the compression spring to apply tensile stress to the concrete clamped between the upper and lower two steel plates, and applies different pressure to the concrete specimen through the impermeability mete...

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Problems solved by technology

[0004] In view of this, the embodiment of the present invention provides a concrete performance test device under axial tensile stress, the main purpose of which is to solve the problems of tensile stress eccentricity and stress relaxation in the testing process of the existing test device

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