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General portland cement modifier containing aluminate minerals and application method thereof

A technology of portland cement and aluminate, applied in the field of general portland cement modifier, can solve the problems of unsuitable performance of general portland cement and high market price, shorten setting time and reduce production cost , the effect of improving performance

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

However, the production of high-alumina cement or sulphoaluminate cement has strict requirements on raw materials, requires specific technology, and has a high market price, so it is generally not suitable for adjusting the performance of general-purpose Portland cement.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] (1) Preparation of a general-purpose Portland cement modifier containing aluminate minerals

[0017] ①Using fly ash and natural limestone as raw materials, Al contained in fly ash 2 o 3 The ingredients are calculated on the basis of the most formed CA minerals, and the chemical composition of the raw materials is shown in Table 1.

[0018] Table 1 calculates the chemical composition of the required raw materials

[0019]

loss

SiO 2

Al 2 o 3

Fe 2 o 3

CaO

MgO

SO 3

∑

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

[0020] According to the chemical composition calculati...

Embodiment 2

[0027] (1) Using bauxite tailings and limestone as raw materials, the Al contained in the bauxite tailings 2 o 3 Dosing calculation is based on the most CA minerals formed. Calculate according to the chemical composition of raw material in table 1, obtain the raw material ratio of present embodiment to be: bauxite tailings 32.77%; Limestone 67.23%; Add the 0.5% CaF of above-mentioned raw material quality 2 As a mineralizer, it is prepared as a raw material batch for modifiers;

[0028] ② Grind the batch material until the residue on the 0.08mm square hole sieve is less than 15%, and calcinate at 1350°C for 40min to obtain clinker;

[0029] 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.

[0030] (2) Application method of a general Portland cement modifier containing aluminate minerals

[0031] ① Mix the general-purpose Portla...

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Abstract

The invention relates to a general a portland cement modifier containing aluminate minerals and an application method thereof. The modifier is prepared by taking waste residue with high content of aluminum and natural limestone as raw materials, reasonably designing the mineral compositions of ingredients, calcining at 1250 to 1350 DEG C for 15-60min to obtain a modifier clinker, and adding gypsum to the obtain modifier clinker to obtain the general portland cement modifier with high contents of aluminate minerals, such as CA and C12A7. The modifier clinker or the modifier can be mixed into general portland cement with appropriate ratio to replace a part of clinker, thus the characteristics of rapid hydration and excitation on slag, fly ash and other admixtures of early strength minerals are utilized so as to form more hydrated products such as ettringite (AFt), hydrated aluminate (ferrite) and the like and regulate the types and ratio of hydrated products of portland cement, thereby achieving the purpose of improving the performance of general portland cement and lowering the production cost.

Description

technical field [0001] The invention relates to a general-purpose Portland cement modifier containing aluminate minerals, in particular to a general-purpose Portland cement modifier containing aluminate minerals and an application method thereof, belonging 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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B22/14
Inventor 李艳君刘晓存王卫山李保亮刘通吴远超
Owner UNIV OF JINAN