Anti-corrosion admixture for oceanic concrete

Abstract

The invention relates to an anti-corrosion admixture for oceanic concrete, which can enhance the anti-corrosion capability of the oceanic concrete by using a plurality of anti-corrosion mechanisms. The anti-corrosion admixture for the oceanic concrete comprises the following components by weight percent: 20-30% of calcium nitrite, 15-20% of calcined gypsum, 5-10 % of laminated soluble sodium silicate, 3-5% of hexamethylenetetramine, 1-3% of sodium tripolyphosphate, 0- 20% of water reducing agent, 0-0.4% of air entraining agent and the balance of coal ash. In a preferred scheme of the invention, the the calcined gypsum is obtained by calcining at 600-800 DEG C, and the modulus of the laminated soluble sodium silicate is from 2.1 to 2.3. In the invention, the novel anti-corrosion admixture for the oceanic concrete is formed by combining a corrosion resisting agent of reinforcing steel bars with activators of concrete admixtures (coal ash and grounded furnace slag), thereby the anti-corrosion capability of the oceanic concrete is greatly enhanced.

Description

technical field The invention relates to a concrete admixture, in particular to a marine concrete anti-corrosion admixture. Background technique The 21st century is the ocean century. Our country is a large ocean country, and it is in a period of rapid economic development. Many important buildings costing a lot of money, such as cross-sea bridges, submarine tunnels, offshore oil production platforms, seaports, offshore projects, etc. have been or are under construction. The durability of structures has naturally become the focus of attention in civil engineering circles. In order to ensure the durability of marine concrete structures such as cross-sea bridges and subsea tunnels, some super-large projects in China have even adopted a 100-year design reference period. The concrete engineering adopts a comprehensive durability technology plan centered on high-performance concrete technology. The ocean is the main source of chloride ions, and seawater usually contains about ...

AI Technical Summary

Problems solved by technology

(2) Formation of corrosion cells

However, the existing various measures have a single mechanism of action, and the effect is not very satisfactory.

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