Concrete test loading device and test method under load and multifactor coupling

Abstract

The invention aims to provide a concrete test loading device and a test method under load and multifactor coupling. The concrete test loading device comprises a press machine, a fixture, a sensor component and a test piece box, wherein a concrete test piece and the sensor component are mounted in the fixture; the fixture is mounted in the press machine; and the test piece box is sleeved on the exterior of the press machine. According to the concrete test loading device and the test method, the structure is simple, the operation is convenient, real working conditions of a concrete member under the combined action of stress and chemical erosion, drying and watering cycle or freezing and thawing cycle in an actual project can be simulated, so that data measured in a laboratory is enabled to have high value of reference on projects.

Description

technical field [0001] The invention relates to a test device and a test method, in particular to a concrete test device and a test method. Background technique [0002] The deterioration and failure of concrete in actual engineering is usually the result of the coupling of multiple damage factors, and it is difficult to accurately reflect the actual engineering by analyzing the durability of concrete based on the effect of a single factor. Therefore, it is of great significance to establish a multi-factor coupling test method that simulates the real environment-stress state, and to study the degradation law of concrete performance under the multi-factor coupling, the failure mechanism and protective measures. [0003] At present, there have been similar designs of loading devices for concrete durability tests under compressive stress and multi-factor coupling at home and abroad, and there are literature reports on the research and analysis of this technology; The device us...

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Problems solved by technology

[0003] At present, there have been similar designs of loading devices for concrete durability tests under compressive stress and multi-factor coupling at home and abroad, and there are literature reports on the research and analysis of this technology; The device uses a stress wrench to tighten the nut to load the specimen. As we all know, the tensile ultimate bearing capacity of concrete is about 1 / 20 of the compressive ultimate bearing capacity. It is much larger, and frequent tightening of the loose nut will inevitably wear the thread and reduce the service life and test accuracy of the device; Zou Chaoying of Harbin Institute of Technology announced a set of devices designed for compressed concrete, in order to make the entire fixture and specimen just fit. The existing rapid freeze-thaw cycle machine is used in the test piece box. The area of ​​the pressing plate is designed as the cross-sectional area of ​​the standard test piece (a square of 100mm×100mm), and the test piece is a non-standard piece (a cross-section of φ100 circle), so as to use the extra space to place the tie rods, so the diameter of the tie rods is limited. As a result, either high-strength bolts with high strength but not reusable are used, or they are only suitable for compression concrete specimens with low design strength; Chinese invention patent CN101979990A discloses a set of devices that can correspond to multiple fixtures with one loading device, which reduces the cost, but it is still only suitable for bending test pieces. Large wear; Chinese invention patent CN2449222Y announced an in-situ press, which mainly loads the brickwork placed in it through the interaction of the jack, the high-strength tie rod and the upper and lower steel plates, so as to realize the on-site measurement of the masonry resistance. The effect of compressive strength

But it is only an on-site measurement device for the masonry compressive strength, and has nothing to do with the concrete durability loading test

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