Marine concrete based on combined functional type additive

Abstract

The invention discloses marine concrete based on a combined functional type additive. The marine concrete overcomes the defects that existing concrete is poor in durability and corrosion resistance. The marine concrete comprises the following raw materials by weight part of 100 parts of hot cement, 25-30 parts of I-level coal ash, 25-30 parts of granulated blast furnace slag, 0.5-1.5 parts of an anti-crack anti-corrosion plasticizer, 250-280 parts of medium-coarse sand, 360-400 parts of secondary rubble and 50-60 parts of water in a mixing mode. The anti-crack anti-corrosion plasticizer comprises the following components by weight percentage of 20-30% of a shrinking and reducing plasticizer, 5-15% of acid and a material capable of generating acid, 1-6% of a corrosion resisting agent, 0.1-1% of a catalyst, 1-3% of a neutralizing agent, 0.1-0.3% of a water repellent, 5-40% of a micro-expanding agent, 0.05-0.5% of an air entraining agent, 1-5% of a compacting agent and 15-55% of a carrier. The strength, the durability, the chloridion permeability resistance and the chloridion diffusion coefficient of the marine concrete are all enhanced.

Description

technical field [0001] The invention relates to concrete, in particular to marine concrete based on composite functional admixtures. Background technique [0002] The influence factors of the geographical environment of coastal concrete structures, especially cross-sea bridges, on concrete bridges and underwater structures are significantly higher than those of inland geographical environment. The main factors that lead to a significant decline in the durability of coastal concrete structure engineering are analyzed as follows: [0003] 1. Chlorine salts in seawater corrode the steel bars in concrete structures, causing structural damage and greatly reducing durability. [0004] The marine concrete project has been in the environment of seawater erosion for a long time, but the seawater is rich in a large amount of chloride salt, and its content is 100-1000 times that of ordinary fresh water. Chloride ions have the characteristics of small particle radius and very strong p...

AI Technical Summary

Problems solved by technology

[0007] 2. Corrosion damage of marine concrete by acid and alkali ions, resulting in a decrease in durability

The level of sea breeze is above 6-12 all year round. There will be water, water vapor, impurities and various corrosive media in the sea breeze, which will cause corrosion damage to the concrete structure and affect the durability of concrete.

[0010] 3. Freeze-thaw damage

[0012] 4. The influence of carbonization

Cracking is caused by concrete plastic shrinkage, chemical shrinkage, dry-wet shrinkage, and temperature difference shrinkage. Combining the above five factors can cause damage to the marine concrete structure, resulting in a serious decline in durability

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