High-magnesium micro-expansive moderate heat Portland cement for water-power engineering and preparation method thereof

Abstract

The invention discloses a high-magnesium micro-expansive moderate heat Portland cement for water-power engineering and a preparation method thereof. Through control on the grinding fineness of raw materials, sintering temperature of a cement clinker, insulation time, cooling system and cement grinding fineness, reasonable control of expansion effect time and expansion size of periclase in the cement clinker is realized, so that the content of MgO is 3.5%-5%, and periclase size is 2-10 mum. Experiments show that the high-magnesium micro-expansive moderate heat Portland cement for water-power engineering has late expansion mainly occurred 28 days after hydration of the cement and has expansion enhancement in 28-180 days of 0.011%-0.020%, and the expansion time basically fits the late temperature drop stage of large-volume concrete in the water-power engineering, so as to effectively compensate for the late thermal shrinkage of concrete in the water-power engineering.

Description

technical field [0001] The invention belongs to the cement and its preparation method in the technical field of building materials, in particular to a high-magnesium micro-expansion medium-heat cement for hydropower engineering and its preparation method, in particular to a cement which utilizes calcium raw materials, siliceous raw materials, and iron High-magnesium micro-expansion medium-heat cement prepared from raw materials, aluminum raw materials, magnesium raw materials, and gypsum, whose late-stage micro-expansion effect can effectively compensate for the late-stage temperature drop and shrinkage of concrete in hydropower projects. Background technique [0002] As a clean and renewable energy, hydropower is a key energy source for the priority development of my country's electric power industry. At present, there are hundreds of hydropower stations built, under construction or under construction in my country, all of which are designed for a 100-year lifespan. After ...

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Problems solved by technology

[0007] "Micro-expansion medium-heat Portland cement and its production method" developed by Guangxi Yufeng Cement Co., Ltd. (patent application number: 201210510958.6), the MgO content in the cement is 3.5%-5.0%, and the scientific research and design of building materials in Guizhou Province "A method for producing medium-heat Portland cement" (patent application number: 201010128111.2) developed by the Institute, "A method of using double-expansion cement to pour dams" developed by Zhejiang University (patent application number: 201210100106.X) , the content of MgO in the clinker is 4.0%-6.0%. These patent applications have no influence on the grinding fineness of raw materials, cement clinker firing temperature, holding time, cooling system, etc. Expansive periclase in high-magnesium medium-heat cement The factors that form are described in detail

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