Abstract
Large-scale water infrastructure such as immersed tunnels remain in a seawater environment for a long time, and gradually deteriorate under the action of high water head, soil pressure and corrosive ions in seawater solution. In order to simulate the corrosion damage and deterioration of concrete in seawater environment, 10% Na2SO4 solution was used to conduct indoor corrosion tests on concrete samples under different water heads and for different durations. The corrosion damage and micro-mechanical properties of concrete under the coupled action of high water head and sulfate are studied by micro-indentation tests. The effect of sulfate ion corrosion and complex mechanical loading was studied. The effect of micro-mechanical properties of concrete is studied on time and space. Numerical simulation and test results show that the results of micro-indentation are in good agreement with the fitting curves. The chemical damage rate and the corrosion depth increase with the increase of water head; the numerical simulation analysis shows that the sulfate concentration is high in the area where the mechanical damage variable is large, which indicates that the two kinds of corrosion occur in concrete and interact with each other.
Highlights
Large-scale water infrastructure is a key project for national economic development and public security
The concrete of immersed tunnels is continuously exposed to sea water
Cl−, The complex environment of hydro-mechanical-chemistry (HMC) coupling corrosion seriously threatens the durability of immersed concrete structures
Summary
Large-scale water infrastructure is a key project for national economic development and public security. The joint action of , H+) in seawater, high water head, the performance large soil pressure and corrosive ions Cl−, The complex environment of hydro-mechanical-chemistry (HMC) coupling corrosion seriously threatens the durability of immersed concrete structures. It is of great significance to study the coupling mechanism of sulfate ion and mechanical load for evaluating the long-term stability of immersed concrete structures in complex environments. Liu [5] systematically studied the basic physical, mechanical properties and microfracture mechanism and damage evolution law of sulfate corroded concrete under high strain rate through split Hopkinson pressure bar (SHPB) test system. We use micro-indentation technology to test the elastic modulus of concrete in multiple layers and points under the coupled corrosion of sulfate and high water head. This paper provides scientific basis for understanding the deterioration law of underground concrete structure under complex marine corrosion environment
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