General portland cement modifying agent containing high cementing property mineral* and application method thereof

A technology of Portland cement and modifier, applied in the field of inorganic non-metallic materials, can solve the problems of difficulty in achieving the design purpose, difficulty in industrial production control, high requirements for atmosphere, etc. low temperature effect

Inactive Publication Date: 2011-01-19
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The coexistence temperature range of the two is too narrow, the clinker calcination process has high requirements on the atmosphere, and it is difficult to control industrial production. The actual mineral composition in the obtained clinker is often difficult to meet the design requirements.

Method used

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  • General portland cement modifying agent containing high cementing property mineral* and application method thereof
  • General portland cement modifying agent containing high cementing property mineral* and application method thereof
  • General portland cement modifying agent containing high cementing property mineral* and application method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] (1) A mineral containing high gelling properties Preparation of Universal Portland Cement Modifier

[0018] ①Using fly ash, natural gypsum and limestone as raw materials, Al contained in fly ash 2 o 3 to form the most The ingredients are calculated on the basis of minerals, and the chemical composition of the raw materials is shown in Table 1.

[0019] Table 1 calculates the chemical composition of the required raw materials

[0020]

loss

SiO 2

Al 2 o 3

Fe 2 o 3

CaO

MgO

SO 3

∑

[0021] fly ash

2.37

50.11

36.69

5.55

3.12

0.56

-

98.40

Bauxite tailings

13.89

40.19

43.17

1.48

0.71

0.47

99.91

limestone

42.77

2.12

0.33

0.24

52.79

1.43

-

99.58

plaster

18.10

5.02

0.45

0.24

30.17

0.24

42.50

96.72

[0022] According to...

Embodiment 2

[0029] (1) Using bauxite tailings, natural gypsum and limestone as raw materials, the Al contained in bauxite tailings 2 o 3 to form the most Minerals are used as the basis for calculation of ingredients. According to the chemical composition calculation of the raw materials in Table 1, the ratio of raw materials obtained in this embodiment is: bauxite tailings 29.64%; gypsum 7.78%; limestone 62.58%; plus 0.5% CaF of the above-mentioned raw material quality 2 As a mineralizer, it is prepared as a raw material batch for modifiers;

[0030] ② Grind the batch material until the residue on the 0.08mm square hole sieve is less than 15%, and calcinate at 1320°C for 30min to obtain clinker;

[0031] ③ The clinker is mixed with 8% gypsum (calculated based on the total mass of the modifier), and ground until the residue on a 0.08mm square hole sieve is less than 10%, to obtain a cement modifier.

[0032] (2) A mineral containing high gelling properties Application method of univer...

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PUM

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Abstract

The invention relates to a general portland cement modifying agent containing high cementing property mineral and an application method thereof. The modifying agent is formed by reasonably designing ingredient minerals by using waste residues with high aluminum content and natural or industrial by-product plaster as well as natural limestone as raw materials, the modifying agent is calcined for 15-60 min at 1250-1350 DEG C to prepare a modifying agent clinker; and the modifying agent clinker is added into the plaster to prepare the general portland cement modifying agent with higher mineral content. The application method comprises the steps of: doping the modifying agent clinker or the modifying agent into the general portland cement in the proper proportion to replace a part of clinkers to play a role in quick hydration of early strength minerals and excitation function to mixed materials, such as slag, flyash and the like, so as to form more hydration products, such as ettringite, alumina gel and the like and regulate the category and the proportion of the portland cement hydration product. The invention solves the problems of narrow coexistence temperature of C3S and minerals and non-matching of the temperature, and guarantees the effective utilization of the high cementing property mineral with early strength property to achieve the aims of improving the general portland cement performance and reducing the production cost.

Description

technical field [0001] The invention relates to a general portland cement modifier, in particular to a high-gelling mineral The general-purpose Portland cement modifier and the application method thereof belong to the field of inorganic non-metallic materials. Background technique [0002] Portland cement is the most widely used and most used cementitious material in the field of building materials worldwide. Its clinker is composed of four main minerals (C 3 S, C 2 S, C 3 A and C 4 AF), the calcination temperature is 1450°C. C 3 S and C 2 S is the main mineral in Portland cement clinker, and its hydration products are mainly calcium silicate hydrate (C-S-H) and calcium hydroxide, C 3 The high S content and fast hydration play a major role in the strength properties of cement. However, if the C in the cement clinker is increased 3 The content of S minerals will make the burnability of raw meal worse and the calcination temperature will increase. C 3 A and C 4 A...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B22/14C04B28/04
CPCC04B7/02C04B7/48
Inventor 刘晓存李艳君王卫山刘通李保亮吴远超
Owner UNIV OF JINAN
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