A kind of low clinker cement and its preparation method and application

Abstract

The invention provides a low-clinker cement and its preparation method and application. The low-clinker cement includes the following raw materials in parts by mass: 75-85 parts of blast furnace slag, 10-20 parts of gypsum, 1-10 parts of red mud, cement 2 to 5 parts of clinker, the sum of calcium, silicon and aluminum oxides in the blast furnace slag is greater than 80wt%, the content of calcium carbonate in the blast furnace slag is ≤10wt%, and the specific surface area is ≥350m 2 / kg. The present invention uses highly active blast furnace slag as the main component of cement, mixes gypsum, red mud and a small amount of cement clinker, makes full use of the alkali activity of red mud and blast furnace slag, and through the reasonable proportioning of several ash body components, Under the synergistic action of each component, the low-clinker cement with higher mechanical properties is produced by reaction, and the amount of cement clinker is reduced.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to a low-clinker cement and its preparation method and application. Background technique [0002] Since the 20th century, cement concrete has become the material of choice for modern engineering structures such as housing construction, bridges, water conservancy, and highways. As the largest man-made material in the civil engineering industry, cement concrete is used in a huge amount. The cementitious material of cement concrete is mainly composed of cement, and cement is obtained by co-grinding cement clinker and gypsum. Cement clinker is a semi-finished product obtained by high-temperature calcination of limestone, clay and other raw materials. It consumes a lot in the process of preparing cement clinker, which is expensive and causes serious pollution. Therefore, reducing the use of cement clinker will help reduce costs and protect the environment. [000...

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Problems solved by technology

[0004] It has been reported that red mud is used to prepare cement, and clinker-free cement is prepared by using metallurgical solid waste steel slag and slag as the main raw materials, adding anhydrite, desulfurized gypsum, and red mud powder to prepare a clinker-free cement, but the red Mud micropowder is a micropowder obtained by calcining Bayer red mud at 600-750°C for 0.5-4 hours and ball milling. Its preparation process requires high-temperature calcination, which still has great energy consumption.

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