Cement concrete preventing corrosion of chlorine salt and preparation method thereof

Abstract

The invention belongs to the technical field of building materials, and discloses cement concrete preventing corrosion of chlorine salt and a preparation method thereof. The concrete comprises a concrete gel material, yellow sands, stones, water and a water reducer, wherein the gel material comprises the following components in percentage by weight: 20-50% of ardealite, 30-60% of slag, 1-20% of steel slag and 1-20% of clinker. C30 mobile cement concrete, C40 mobile cement concrete and C40 hard concrete can be prepared by the method provided by the invention. The chlorine salt corrosion preventing performance of the cement concrete is remarkably superior to that of common silicate cement concrete or slag silicate cement concrete. The preparation method provided by the invention is simple. Various solid wastes can be effectively and reasonably utilized, and the condition that the cost and consumption of the existing cement concrete are high is reduced. Meanwhile, the cement concrete prepared by the invention further has excellent chlorine salt corrosion preventing performance.

Description

technical field [0001] The invention belongs to the technical field of building materials, and relates to a chlorine salt corrosion-resistant cement concrete and a preparation method thereof. Background technique [0002] Since coastal hydraulic reinforced concrete structures are in the marine environment for a long time, it is quite common for the chloride ions in seawater to intrude into the concrete and cause damage to the reinforced concrete structure. my country's coastal reinforced concrete buildings generally experience varying degrees of corrosion damage about 10 years after they are built, which seriously endangers the safety of the building, and the economic losses caused by maintenance and shutdown due to maintenance are staggering. Therefore, Professor P.K.Metha believes that chloride ion corrosion Destruction of concrete has become the primary factor for the durability failure of concrete structures. [0003] The length of my country's coastline is 18,000 kilome...

AI Technical Summary

Problems solved by technology

Among them, CN200510101480.1 introduces a Portland cement resistant to chloride salt erosion. Its components and contents are Portland cement clinker 14-94%, mixed materials 5-85%, gypsum 1-10%, Additives 0~15% and a certain amount of chopped fiber 0~2%, although it can improve the resistance of concrete to chloride salt erosion, but due to the high price of added additives and fibers, and the Portland cement clinker used The dosage is large, so the overall cost is high, and more importantly, the electric flux of this Portland cement has not been greatly reduced; CN201210035581.3 uses nano-kaolin to modify concrete, but this anti-chlorine salt penetration The agent needs to be ground and calcined, which will cause large water demand and poor working performance of the concrete

CN200610068664.7 invented an anti-chloride ion penetration enhancer, which mainly consists of ultrafine silicon powder 15~20%, metakaolin 20~25%, high-quality fly ash 20~25%, ultrafine nanofiber 5~10% , high-efficiency superplasticizer 6%, etc., due to the huge specific surface area required by the raw materials used, this virtually increases the cost and increases the amount of high-efficiency superplasticizer, making it difficult to be widely used

[0005] Phosphogypsum is an industrial by-product of phosphoric acid produced by wet process in phosphorus chemical enterprises. At present, the resource utilization rate of phosphogypsum in China is less than 10%, and the remaining part is piled up as solid waste. Or landfill and other methods, the accumulation of phosphogypsum not only takes up a lot of land, but also causes serious pollution to the surrounding environment. It is urgent to speed up the resource utilization of phosphogypsum; Pig iron will discharge 0.3~1t of slag, and the annual slag discharge of China's iron and steel plants is as high as 60 million tons. The discharge and accumulation of these slags not only consume a lot of manpower, material and financial resources, but also occupy the land and pollute the environment; steel slag It is also a kind of solid waste. About 15% of steel slag is produced for every 1 ton of steel produced. The amount is increasing year by year, occupying a large amount of land, and polluting the environment. So far, the utilization of steel slag is mainly used as concrete aggregate and basic filler. The comprehensive utilization of steel slag is relatively difficult due to various reasons such as slow hydration, low early strength, poor stability, low grindability and difficult raw material pretreatment, and has become a bottleneck problem in the sustainable development of steel production.

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