Test device and method for simulating corrosion and deterioration of hydraulic concrete under high hydraulic gradient

Abstract

The invention provides a test device and method for simulating corrosion degradation of hydraulic concrete under a high hydraulic gradient. A sealed tank is used for applying corrosion liquid with high hydraulic gradient to a concrete standard sample; three-direction pressure stress is applied to the concrete standard sample with combination of high-strength bolts and an axial loading rod; the pressure stress and the corrosion liquid pressure on the sample are measured by using a pressure sensor, an axial pressure sensor and a water pressure sensor which are arranged; a sealed protection chamber is used for separating the corrosion liquid from the high-strength bolts and the like, so that the loss of pre-tightening force and the damage to the pressure sensor are reduced; a high-elasticity rubber tube and a water stopping device which are arranged in an corrosion chamber are used for limiting a permeable passage. Through the test device and method, three groups of test can be simultaneously carried out, so that the test efficiency can be obviously improved; meanwhile, the operation condition that the hydraulic concrete is subjected to the action of the high hydraulic gradient and environment water for a long time can also be simulated; the evolution property of corrosion degradation of the hydraulic concrete under the action of the high hydraulic gradient can be really reflected.

Description

technical field [0001] The invention relates to the technical field of hydraulic concrete research, in particular to a test device and method for simulating the dissolution and degradation of hydraulic concrete under high hydraulic gradient. Background technique [0002] At present, most studies on the durability of hydraulic concrete structures focus on the contact corrosion test under a single load (unidirectional tension and compression, bending moment), without considering the high hydraulic gradient effect of hydraulic concrete. And related penetration test research, most of them use clear water as the medium to carry out penetration and corrosion tests under unidirectional tension and compression stress. Almost all concrete structures in actual engineering are subject to a three-dimensional stress state. On the one hand, when the stress level is low, the compressive stress will close the internal pores of the concrete and slow down the rate of dissolution and deteriora...

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Problems solved by technology

[0004] The technical problem to be solved in the present invention is to provide a test device for simulating the dissolution and deterioration of hydraulic concrete under high hydraulic gradient, which can solve the existing problems. The defect that the technology cannot simultaneously simulate the corrosion and degradation process of hydraulic concrete under the action of three-dimensional stress and high hydraulic gradient can truly reflect the evolution characteristics of hydraulic concrete corrosion and degradation under the action of high hydraulic gradient

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