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High performance expansible cement clinker expansion agent series prepared thereby

A technology of cement clinker and expansive cement, which is applied in the field of concrete expansive agents, can solve the problems of unsafe expansion, achieve fast expansion rate, inhibit carbonization, and improve the bearing capacity of single piles

Inactive Publication Date: 2008-12-31
CHINA BUILDING MATERIALS ACAD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The expansion agent produced by the second method has better performance, but CSA clinker needs to use a large amount of high-quality bauxite which is in short supply as raw material, and the calcining temperature of lime-based expansion clinker is very high (1400 ° C ~ 1600 ° C), which is easy to produce Calcium oxide is dead burned, resulting in the hidden danger of unsafe expansion

Method used

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  • High performance expansible cement clinker expansion agent series prepared thereby
  • High performance expansible cement clinker expansion agent series prepared thereby
  • High performance expansible cement clinker expansion agent series prepared thereby

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Embodiment 1: the manufacture of HCSA high performance expansive cement clinker

[0049] The chemical composition of each raw material is shown in Table 1, and the ingredients are prepared according to the design requirements:

[0050] Percentage by weight, limestone 72%, bauxite 8%, gypsum 17%, iron powder 3%. The raw materials were mixed and ground together to form raw meal powder, which was calcined in a rotary kiln at 1250°C. The product was HCSA clinker, whose chemical composition was shown in Table 2, and the calculated mineral composition of HCSA clinker was shown in Table 3.

[0051] Raw material chemical composition (%) of table 1 HCSA high performance expansive cement clinker

[0052] raw material name

loss

SiO 2

Al 2 o 3

Fe 2 o 3

CaO

MgO

SO 3

TiO 2

Bauxite

15.31

6.05

70.68

2.07

0.97

0.12

-

1.63

limestone

41...

Embodiment 2

[0057] Embodiment 2: the manufacture of HCSA series expansion agent

[0058] The HCSA high-performance expansive cement clinker of Example 1 was used to grind together with the corresponding raw materials according to the ratio in Table 4 to obtain a series of concrete expansive agents.

[0059] Physical performance test of concrete expansion agent: the expansion agent prepared in Table 4 was tested according to the current national industry standard JC476-2001 "Concrete Expansion Agent", and the dosage of the expansion agent was uniformly 8wt%. The physical properties are shown in Table 5.

[0060]

Embodiment 3

[0061] Example 3: Production of series HCSA high performance expansive cement clinker and series of expansion agents

[0062] Using the same raw materials as in Example 1, changing the ratio of raw materials according to the values ​​in Table 6-1, a series of HCSA high-performance expansive cement clinkers were obtained. Then design and prepare a series of expansion agents according to Table 6-2 according to the same method as in Example 2, and the test results are listed in Table 6-3.

[0063] Table 6-1 Raw material ratio of HCSA cement clinker (weight percentage)

[0064] raw material

HCSA1

HCSA2

HCSA3

Limestone 50%~90%

50

90

59

Bauxite 1%~20%

20

1

10

Gypsum 5%~30%

25

5

30

Iron powder 1%~5%

5

4

1

[0065] As can be seen from the above examples, the present invention has the advantages that: the mineral composition of the HCSA high-performance expan...

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Abstract

Disclosed are a high-performance expansion cement clinker, a manufacturing method of the cement clinker, a series concrete expansion agent and a manufacturing method of the concrete expansion agent. The high-performance expansion cement clinker is made as follows: firstly, 50-90 wt% of limestone, 1-20 wt% of bauxite, 5-30 wt% of gypsum and 1-5 wt% of iron powder are grinded together into raw meal, then the raw meal is calcined at 1250-1400 DEG C in a rotary kiln, a tunnel kiln or a roller kiln to get the cement clinker. The cement clinker is milled alone or in combination with sulfur calcium aluminate cement clinker, calcium aluminate cement clinker, anhydrite, calcined gangue, alunite, calcined kaolin and hydration heat inhibiting additives until the specific surface area reaches 200-400m2 / kg, so as to get the series concrete expansion agent. The high-performance expansion cement clinker disclosed in the invention is calcium hydroxide-hydrated calcium aluminate sulfate double-expansion source expansion clinker, which is fast in expansion rate and high in expansion efficiency and uses less bauxite of scarce resources; besides, the calcination temperature is low to avoid calcium oxide dead burning, so the preparation is safe and reliable.

Description

technical field [0001] The invention belongs to the field of building materials, and in particular relates to the preparation and production of a high-performance expansive cement clinker and a concrete expansion agent based on it. Background technique [0002] There are generally two ways to manufacture concrete expansion agents at home and abroad: [0003] One is to use special cement clinker (mainly sulphoaluminate cement clinker and calcium aluminate cement clinker, of which calcium aluminate cement clinker is also known as high alumina cement clinker, bauxite cement clinker) and anhydrite Grinding in a certain proportion, or adding part of lime, calcined alunite (aluminum sulfate clinker), raw alunite, calcined kaolin (aluminosilicate), high-alumina coal gangue (aluminosilicate), dickite And other auxiliary materials, the hydration product of this kind of expansion agent is calcium sulfoaluminate hydrate (ettringite), which is basically produced in China, such as UEA-I...

Claims

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Application Information

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IPC IPC(8): C04B7/34C04B7/43
CPCC04B7/434Y02P40/121
Inventor 赵顺增刘立郑万廪姚燕吴勇曹淑萍杨伊静武旭南
Owner CHINA BUILDING MATERIALS ACAD
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