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A compound mineral admixture for marine engineering reinforced concrete structure

A mineral admixture and reinforced concrete technology, applied in the field of compound mineral admixtures, can solve the problems of decreased stability of alkaline passivation film, corrosion of steel bars, reduction of concrete alkalinity, etc., to increase the migration performance of anti-rust molecules , reduce the use cost of enterprises, and improve the effect of corrosion resistance

Active Publication Date: 2014-10-29
浙江合力海科新材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, after the addition of traditional mineral admixtures, the active components react with the calcium hydroxide of the cement hydration product, reducing the alkalinity of the concrete, which eventually leads to a decrease in the stability of the alkaline passivation film on the surface of the steel bar. When the steel surface of the concrete is exposed, it will quickly cause corrosion of the steel bar. Therefore, it is necessary to add anti-corrosion measures such as rust inhibitors to solve the above problems

Method used

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  • A compound mineral admixture for marine engineering reinforced concrete structure
  • A compound mineral admixture for marine engineering reinforced concrete structure
  • A compound mineral admixture for marine engineering reinforced concrete structure

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Experimental program
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Effect test

Embodiment 1

[0037] Embodiment 1: This kind of composite mineral admixture used for marine engineering reinforced concrete structure, according to the following component formula by mass percentage: fly ash: 35%; Zeolite: 5%; Slag: 40%; Silica fume: 10%; rust inhibitor: 5%; dispersant: 5%.

[0038] The formula is a new type of concrete admixture organically compounded by various ultrafine mineral components through a specific process. It is mainly based on slag powder and fly ash, and its mechanical properties such as early and late strength are further improved, so as to achieve reinforced concrete. Corrosion resistance, reducing the heat of hydration of concrete, improving the durability of concrete, and improving the early strength decline of concrete caused by the addition of a large number of mineral admixtures, and is suitable for marine reinforced concrete projects with severe chloride ion and sulfate erosion.

Embodiment 2

[0039] Embodiment 2: This kind of composite mineral admixture used for marine engineering reinforced concrete structure is formulated according to the following mass percentages: fly ash: 20%; zeolite: 10%; slag: 35%; silica fume: 5%; rust inhibitor: 15%; dispersant: 5%; shrinkage reducer: 10%.

[0040] The shrinkage-reducing component mixed in this formula can reduce the shrinkage of concrete, especially the early shrinkage, by adjusting the surface tension of the solution and other physical means. Improve the corrosion resistance of concrete. At the same time, the compound migratory rust inhibitor mixed in is beneficial to form a passivation film on the surface of the steel bar, and is suitable for reinforced concrete structures in severely corroded areas such as engineering and water level change areas.

Embodiment 3

[0041]Embodiment 3: This kind of composite mineral admixture used for marine engineering reinforced concrete structure is formulated according to the following mass percentages: fly ash: 20%; zeolite: 5.5%; slag: 30%; silica fume: 5%; rust inhibitor: 15%; dispersant: 3.5%; shrinkage reducer: 5%; anti-crack agent: 16%.

[0042] The formula is mixed with an appropriate amount of composite anti-crack components, so as to reasonably and effectively compensate the shrinkage of concrete, reduce cracks and micro-cracks caused by shrinkage of concrete, and improve the anti-crack and impermeability of concrete. The compound anti-cracking component added not only contains the common anti-cracking agent that works in the early stage, but more importantly, it is compounded with the long-term micro-cracking anti-cracking component that has a good anti-cracking effect in the later stage, so that it is easier to ensure a good performance in compensating the shrinkage of the concrete. Effect....

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Abstract

The invention relates to the field of concrete additives for oceanographic engineering, and aims at providing a compound-doped mineral admixture for a reinforced concrete structure of the oceanographic engineering. The compound-doped mineral admixture comprises the following components in percentage by mass: 20 to 35% of coal ash, 5 to 10% of zeolite, 20 to 40% of slag, 5 to 15% of silica fume, 5 to 15% of corrosion inhibitor, 2 to 5% of dispersing agent, 0 to 10% of shrinkage reducing agent, and 0 to 16% of antimitotic agent. According to the compound-doped mineral admixture, multi-component design is adopted, the functions of all the components are combined and coordinated, and thus the crack resistance and rust resistance of the structure are optimized, and the wear resistance of the oceanographic engineering can be improved; and a plurality of functional components are compounded into the admixture, so that the functional components can be uniformly dispersed in the concrete, and the effects of stably resisting crack and resisting rust can be realized. The compound-doped mineral admixture can reduce the concrete agitating conditions and reduce the usage cost of an enterprise, and is convenient for massive popularization and application.

Description

technical field [0001] The invention belongs to the field of marine engineering concrete admixtures, in particular to a compound mineral admixture used for marine engineering reinforced concrete structures. Background technique [0002] In recent years, with the construction of marine projects such as seaport terminals, cross-sea bridges, offshore oil exploration platforms, and subsea tunnels in my country, as well as the requirements for environmental protection and resource conservation, how to improve the durability of reinforced concrete structures has received widespread attention. The main factors affecting the corrosion of marine engineering concrete are steel corrosion, freezing damage, chemical corrosion and marine microbial action. Corrosion of steel bars is the main cause of damage to reinforced concrete structures. For the durability of concrete structures, the main technologies currently used are: concrete surface coating protection, chemical admixtures, minera...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B24/40
Inventor 丁小富潘崇根詹树林申乾宏盛建松徐强
Owner 浙江合力海科新材料股份有限公司
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