Low-heat high-corrosion-resistance Portland cement and preparation method thereof

Abstract

The invention discloses low-heat high-corrosion-resistance Portland cement and a preparation method thereof. The low-heat high-corrosion-resistance Portland cement is made from, by weight, 62-80 partsof limestone, 0-20 parts of carbide slag, 4-10 parts of clay, 2-5 parts of slag, 2-6 parts of sulfuric acid slag or copper slag, 3-5 parts of lead zinc ore, 3-5 parts of apatite or chlorine salt residue, 1-3 parts of an activator, 1-3 parts of a mineralizing agent, and 0.1-4 parts of a stabilizer. The preparation method includes the steps of grinding the materials, delivering the powders into a homogenizing base for homogenizing; conveying the homogenized material to a suspended preheater and a cracking furnace with the temperature of 850-870 DEG C; transferring to a rotary kiln for calcining, wherein the rotary kiln rotates at 3.2-3.5 rmp, a grate cooler has rod push rate of 9-17 per min, and calcining temperature is 1250-1350 DEG C. The low-heat high-corrosion-resistance Portland cementand the preparation method thereof have the advantages that compressive strength over 28 days is not less than 50 Mpa; compressive strength over 90 days is not less than 70 Mpa; hydration heat over 7days is not higher than 210 KJ/kg; drying shrinkage over 28 days is less than 0.04%; chloride ion diffusion resistant coefficient is less than 0.85*10-12 m<2>/s.

Description

technical field [0001] The invention belongs to the technical field of materials, and in particular relates to a low-heat and high-corrosion Portland cement and a preparation method thereof. Background technique [0002] The cement industry is an industry with high resource and energy consumption and serious environmental pollution. It must adhere to circular economy and sustainable development, take a new path of industrialization, practice resource conservation, and protect the ecological environment. Portland cement is the inevitable choice for the development of the cement industry. The main mineral phase is C 3 S,C 2 S,C 3 A and C 4 AF; its main hydration products such as calcium hydroxide, calcium sulfoaluminate hydrate, C-S-H gel, etc. have the characteristics of thermodynamic instability in the erosive environment, and are easily eroded by eroding ions, resulting in erosion damage and the resistance of components. problem of receptivity. Faced with the problem o...

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Problems solved by technology

However, the above methods also have limitations. Although the addition of admixtures can improve the erosion of chloride ions, there are still many problems, such as being easily affected by factors such as the location and composition of raw materials, compatibility with admixtures, and construction techniques. , has great limitations, and some admixtures are also controversial in improving the durability of cement-based materials. The early strength of the material is not good for construction

[0003] The existing cementitious materials for offshore cement are all prepared by adding cement and admixtures. This method usually affects the quality of the admixture due to the different sources and qualities of the admixture and the compatibility with admixtures. The stability of cement or cementitious materials, and thus their durability and long-term safe use

[0004] A large number of domestic researches and patents are based on the above two ideas to improve the anti-corrosion performance of cement and concrete, such as the patent "a compound mineral admixture for marine engineering reinforced concrete structures", "a high-grade mineral admixture containing mineral admixtures" Performance Pumping Concrete", "Mineral Admixture Class II Composite Fly Ash for Concrete and Its Preparation Method", "A Marine Cement Added with Modified Metakaolin", "Anti-erosion Low Calcium Portland Cement and Its preparation method" and other active admixtures such as fly ash, waste residue, metakaolin, and tailings are used to replace cement in a large proportion to improve the anti-corrosion performance of concrete; the patent "anti-corrosion low-calcium Portland cement and its preparation method 》By increasing the content of belite in cement and reducing the content of tricalcium aluminate to improve its anti-ion erosion performance, but it is not conducive to the development of early strength

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