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

A technology for clinker cement and cement clinker, applied in cement production and other directions, can solve problems such as large energy consumption, reduce energy consumption and CO2 emissions, have excellent sulfate corrosion resistance, and excellent alkali-aggregate reaction ability. Effect

Active Publication Date: 2021-11-02
GUANGZHOU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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.

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] A low-clinker cement comprising the following components in parts by weight:

[0043] 80 parts of blast furnace slag, 15 parts of industrial gypsum, 5 parts of red mud, 3 parts of P.O 42.5 cement clinker.

[0044] Among them, the content of CaO in blast furnace slag is 49.12%, SiO 2 Content 29.42%, Al 2 o 3 content of 13.86%, the sum of calcium, silicon and aluminum oxides is greater than 80wt%, the content of calcium carbonate in blast furnace slag is less than or equal to 10wt%, blast furnace slag is alkaline water-quenched blast furnace slag, and the aging time is less than 1 year (the aging time is too long long will reduce blast furnace slag activity). Gypsum is natural gypsum, in which CaO content is 49.12%, SO 3 The content is 42.22%, and the anhydrite content contained in the gypsum is not more than 50% of the total mass of the gypsum. Red mud is an industrial solid powder produced during the Bayer process of aluminum smelting, and its main components inclu...

Embodiment 2～4

[0061] Weigh raw materials according to the formula in Table 2 (the properties of each raw material are the same as in Example 1), then prepare low clinker cement samples according to the method in Example 1 and perform compressive and flexural strength testing. The results are shown in Table 3.

[0062] The raw material ratio of the low clinker cement of table 2 embodiment 2~4

[0063] Example 2 Example 3 Example 4 Blast furnace slag (part) 75 80 85 Gypsum (parts) 10 20 15 Red mud (part) 10 5 7 P.O 42.5 cement clinker (parts) 2 5 3

[0064] The performance test result of table 3 embodiment 2~4 sample

[0065]

[0066] It can be seen from Table 3 that the 28-day compressive strength of the sample of the embodiment of the present invention is similar to that of ordinary Portland cement (≥42.5MPa), and has good mechanical properties.

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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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B7/24C04B7/21C04B7/36C04B7/52
CPCC04B7/21C04B7/243C04B7/38C04B7/52Y02P40/10
Inventor 马玉玮杜鹏罗甜恬刘卫森胡捷傅继阳
Owner GUANGZHOU UNIVERSITY
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