Loading device and method for exposure test of compression concrete

Abstract

The invention aims at providing a loading device and a method for an exposure test of compression concrete. The loading device comprises a support, a water pool, a supporting beam, loaders, concrete test pieces and rolling shafts, wherein the support comprises a transverse beam and a vertical column, the water pool is arranged below the vertical column of the support, a metal plate is arranged at the bottom of the water pool, the supporting beam is installed in the transverse beam of the support, and the loaders are installed on the supporting beam. The lower end of each loader is connected with a group of concrete test pieces which include three concrete test pieces arranged in the water pool, and the rolling shafts are arranged among the concrete test pieces and between the concrete test pieces and the metal plate. The loading device can simulate actual working conditions of a concrete structural member under combined action of stress, chemical corrosion, carbonization, dry and wet cycle or freezing and thawing cycle and the like, solves the problem of test accuracy loss caused by material looseness or creep deformation of a clamp pull rod or lever in the long-term exposure test, and enables data measured by a laboratory to be provided with engineering reference value accordingly.

Description

technical field [0001] The present invention relates to a test device and method, in particular to a concrete test device and method. Background technique [0002] The deterioration and failure of concrete in actual engineering is usually the result of the coupling of multiple destructive factors, and most researchers like to use specific experimental equipment to simulate a specific environment to conduct rapid tests to study problems in the study of concrete durability. It is difficult to accurately reflect the engineering practice by simulating the test environment through the effect of factors to study and analyze the durability of concrete. Therefore, it is of great significance to design a multi-factor coupling test device and test method under the real exposure environment-stress state to study the degradation law of concrete performance under the multi-factor coupling action, the failure mechanism and the protective measures. [0003] At present, there have been sim...

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Problems solved by technology

The doctoral dissertation of Chen Shudong of Southeast University and the Chinese patent CN 2906593Y proposed several loading devices designed by using the principle of leverage. By adjusting the counterweight to apply constant stress to the concrete specimen, it has the advantages of no stress relaxation, good economy, and simple operation. But the loading efficiency is relatively low

For example: when a 40mm×40mm×160mm specimen is loaded with 50% bending stress, the length of the lever needs to be 0.6 meters, which takes up a lot of experimental space, and the lever will also creep and change during the long-term exposure test Torque, which affects the test accuracy

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