A kind of chlorine salt corrosion resistant carbon nanotube modified reinforced concrete and preparation method thereof

Abstract

The invention belongs to the field of reinforced concrete, and discloses carbon-nanotube-modified reinforced concrete resistant to chlorine salt corrosion and a preparation method thereof. According to the preparation method, chemical applied force and a physical method are combined to make carbon nanotubes dispersed in a polyvinyl alcohol solution, and after a carbon nanotube / polyvinyl alcohol prepolymer solution even in distribution and good in combination is obtained, the prepolymer solution serving as a composite modification agent is added into a cement matrix to obtain a carbon nanotube-polyvinyl alcohol-cement-based composite material even in dispersion. According to the method, the reinforcing effects of the hydroxy carbon nanotubes and polyvinyl alcohol are fully combined into thecomposite modified cement-based material, and not only does the concrete have unique advantages in terms of mechanical properties, but also the porosity can be reduced; by changing an internal microscopic dielectric constant, mobile charges are captured, the formation of corrosive batteries is prevented, corrosive current in the reinforced concrete is significantly reduced, and the corrosion resistance time of the reinforced concrete is prolonged.

Description

technical field [0001] The invention belongs to the field of reinforced concrete, in particular to a chlorine-salt corrosion-resistant carbon nanotube modified reinforced concrete and a preparation method thereof. Background technique [0002] Reinforced concrete structure is one of the most commonly used and widest structural forms in the world. During the whole process of its life cycle, its safety and reliability are very important. Once an accident occurs, it will have serious consequences and cause major casualties and economic losses. Steel bar corrosion is the main cause of damage to reinforced concrete structures, and the economic loss caused by steel bar corrosion is huge. In 2002, the U.S. Congress pointed out that the annual direct economic loss caused by corrosion of steel bars reached 3.79 billion US dollars, and the resulting indirect economic loss was at least 10 times the direct economic loss. The 2009 US infrastructure project survey report pointed out tha...

AI Technical Summary

Problems solved by technology

In 2010, the Ministry of Transport conducted surveys and statistics on a large number of seaports and wharves across the country, and found that due to severe corrosion damage, the average service life of reinforced concrete structures is only 25 years, far less than the 50-year / 100-year design service life (major infrastructure The design service life is 100 years), and its direct economic loss is nearly 500 billion yuan / year

The intrusion of chlorides will cause "depassivation" phenomenon, causing accelerated corrosion of steel bars.

Images