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Abstract
The distribution of new rebar corrosion inhibitor DETA-TU in concrete was studied by XPS. The influence of DETA-TU on the cement hydration, fresh mortar fluidity, the strength and permeability of hardened mortar were also explored. The results show that DETA-TU can be enriched at the interface between mortar and rebar. This is favorable to improve inhibition efficiently of DETA-TU in concrete. DETA-TU can delay the hydration process of cement, the fluidity of fresh mortar is also increased. However, the strength of hardened mortar after 28 days is decreased a little. The permeability of hardened mortar for chloride is lowered considerably after the addition of DETA-TU.
Development and background of migrating corrosion inhibitors (MCI) as well as the significance of maintenance and improvement of durability in reinforced concrete structure using MCI are introduced. The transfer mechanism of MCI in concrete and the inhibition mechanism of steel bar corrosion are discussed. The design principle of the component and the molecule structure of MCI are suggested. A multiplex inhibitor mainly composed by small molecular ethanolamine having two functional groups and other various components having multi-center of active adsorption with different vapor pressure, which behaviours good migratory performance in concrete and long-term stability of film mainly chemisorbed onto the steel surface through the formation of planar five-membered chelate rings with the cation metal has been developed. The introduction of self-repair components and waterproofing components in the inhibitor may lead to the efficacy of repassivation of rusty steel bars in chloride condition and the avoidance of two-way proliferation of volatile components as well as the enhancement of adaptability to the environmental change of reinforced concrete. The token of migratory performance of MCI and appreciation methods of inhibiting efficiency as well as the application research results such as the effect on the durability of reinforced concrete with painting MCI on the hardened concrete surface and the properties of concrete with MCI admixture in the mix are reviewed. The development trend of MCI and the issues to be settled in application techniques of maintenance and improvement of durability of reinforced concrete using MCI are indicated.
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