Device and method for testing concrete capillary water absorption under sustained load functions

Abstract

The invention aims to solve the problem that an existing testing system is difficult to realize sustained load application on concrete and the coupling process of capillary water absorption and discloses a device and a method for testing the concrete surface capillary water absorption under sustained load functions. The test device comprises a water supply unit, a horizontal observation unit, a hollow test piece unit and a steel plate. The test method comprises the steps that the upper end and the lower end of the hollow test piece unit are sealed, and the hollow test piece unit is connected with a water pipe of the water supply unit and the observation unit and is sealed and fixed; after an observation pipe is adjusted to be level, sustained load is applied and water is injected; the initial value of the position of the water column in the pipe and the variation along the time are recorded and observed. The method is easy to operate, the device structure is ingenious, real-time and continuously accurate measurement of the concrete accumulated water absorption process under the sustained load functions is realized, the accumulated capillary water absorption curve is obtained by the measurement under set time and load functions, and the capillary water absorption test research of the concrete material under the sustained load functions and the durability estimation of a practical engineering structure can be carried out.

Description

Technical field [0001] The invention belongs to the technical field of concrete material durability detection, and in particular relates to a concrete capillary water absorption test device and a test method thereof under continuous load. Background technique [0002] For any kind of degradation process, the expansion, cracking and even peeling of concrete are inseparable from the effect of water. Almost all physical and chemical processes that affect the durability of concrete structures involve the transmission and distribution of water in concrete pores and cracks. In addition, water is also a carrier for the migration and diffusion of aggressive media (such as chloride ions) into the concrete. Especially in the unsaturated state, the water absorption process produced by capillary action becomes the main mechanism for the entry of water and water-soluble media into the concrete. Therefore, in recent years, water absorption (Sorptivity) has become an important indicator of th...

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the existing test system is difficult to realize the coupling process of concrete application of continuous load and capillary water absorption, and the problem that the capillary water absorption of the specimen cannot be measured in real time and continuously, and to provide a concrete surface under continuous load. Capillary water absorption test device and test method

[0006] The invention selects the hollow test piece to effectively solve the problem of concrete water absorption supply under the load, thereby realizing the coupling effect of the load and the capillary water absorption process

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