Efficient expansion clinker for cement concrete, preparation method of efficient expansion clinker and application of efficient expansion clinker

A kind of technology of cement concrete and expanded clinker

Active Publication Date: 2016-06-29
JIANGSU SOBUTE NEW MATERIALS +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] Based on the consideration of using solid waste (pyrite slag, rice husk ash), for the expansion agent prepared by using alternative raw materials in the prior art, the hydration speed is fast, the expansion efficiency is low, the preparation energy consumption is high, and the process is complicated. etc., the present invention provides a method for preparing high-efficiency expansion clinker for concrete by using pyrite slag, rice husk ash and other industrial wastes

Method used

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  • Efficient expansion clinker for cement concrete, preparation method of efficient expansion clinker and application of efficient expansion clinker
  • Efficient expansion clinker for cement concrete, preparation method of efficient expansion clinker and application of efficient expansion clinker
  • Efficient expansion clinker for cement concrete, preparation method of efficient expansion clinker and application of efficient expansion clinker

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] (1) Preparation of a kind of high-efficiency expansion clinker for cement concrete

[0044] According to the raw material composition and mass fraction of 22% pyrite slag, 8% rice husk ash and 70% limestone, each component is taken, and after crushing and mixing, it is jointly ground by a mill to a fineness of 250m 2 / kg of raw meal powder. The ground raw meal powder was calcined at 1300°C, and calcined at this temperature for 60 minutes. After the calcination, the fired sample was immediately taken out and quenched in the air, and the specific surface area was 300m2 after grinding. 2 / kg of expanded clinker powder for cement concrete.

[0045] Table 1 is the chemical composition (wt.%) of raw material limestone, pyrite slag and rice husk ash

[0046] name

CaO

Fe 2 o 3

Al 2 o 3

SiO 2

SO 3

MgO

C

loss

limestone

54.07

1.72

0.58

0.25

-

0.18

-

43.2

pyrite cinder

6.17

...

Embodiment 2

[0058] (1) Preparation of high-efficiency expansion clinker and expansion agent for cement concrete

[0059] Limestone, pyrite slag and rice husk ash with a mass ratio of 60:30:10 are crushed and mixed, and are jointly ground by a mill to a fineness of 150m 2 / kg of raw meal powder. The ground raw meal powder was calcined at 1200°C for 120 minutes at this temperature, and the calcined sample was taken out immediately after the calcination and quenched in the air, and the specific surface area was 400m2 after grinding. 2 / kg of expanded clinker powder for cement concrete.

[0060] Table 3 is the chemical composition (wt.%) of raw material limestone, pyrite slag and rice husk ash

[0061] name

CaO

Fe 2 o 3

al 2 o 3

SiO 2

SO 3

MgO

C

loss

limestone

54.07

1.72

0.58

0.25

-

0.18

-

43.2

pyrite cinder

6.17

44.80

26.86

17.11

3.70

0.13

-

1.23

rice hu...

Embodiment 3

[0072] (1) Preparation of high-efficiency expansion clinker and expansion agent for cement concrete

[0073] Limestone, pyrite slag and rice husk ash with a mass ratio of 75:20:5 are crushed and mixed, and are jointly ground by a mill to a fineness of 400m 2 / kg of raw meal powder. The ground raw meal powder was calcined at 1350°C for 30 minutes at this temperature. Immediately after the calcination, the calcined sample was taken out and quenched in the air, and the specific surface area was 200m2 after grinding. 2 / kg of expanded clinker powder for cement concrete.

[0074] Table 6 is the chemical composition (wt.%) of raw material limestone, pyrite slag and rice husk ash

[0075] name

CaO

Fe 2 o 3

Al 2 o 3

SiO 2

SO 3

MgO

C

loss

limestone

54.07

1.72

0.58

0.25

-

0.18

-

43.2

pyrite cinder

6.17

44.80

26.86

17.11

3.70

0.13

-

1.23

rice husk as...

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Abstract

The invention relates to efficient expansion clinker for cement concrete, a preparation method of the efficient expansion clinker and application of the efficient expansion clinker. The efficient expansion clinker is composed of, by weight, 30-60wt% of f-CaO, 5-40wt% of Fe2O3, 3-10wt% of C2S, 2-10wt% of C4AF, 3-15wt% of SiO2, 3-12wt% of Fe and 1-8wt% of C4A3S. The preparation method of the efficient expansion clinker includes: grinding 60-80wt% of limestone, 15-30wt% of pyrite cinders and 5-10wt% of rice husk ash, and well mixing to obtain raw materials; calcining the raw materials for 30-120min at the temperature of 1100-1350 DEG C to obtain the efficient expansion clinker. The expansion clinker can be mixed with dispersive carriers (such as blast furnace slag and copper slag) to form an efficient expanding agent for cement concrete. The expansion clinker and the expanding agent integrate three expanding sources including calcium hydroxide, ferric hydroxide and ettringite and are greatly promoted in expanding performance as compared with an ettringite type expanding agent with a single expanding source; due to a hydraulic binder component, later-stage mechanical properties of the cement concrete can be enhanced to some extent.

Description

technical field [0001] The invention belongs to the technical field of concrete admixtures for building materials, and in particular relates to a high-efficiency expansion clinker for cement concrete, its preparation method and its application. Background technique [0002] Concrete is a building material with a wide range of sources and low prices. With the development of concrete science and technology, concrete materials are more and more widely used in various construction projects. However, due to its own hydration reaction and the dehydration process of the surrounding environment, cement concrete has self-shrinkage, drying shrinkage and temperature-drop shrinkage, which are prone to shrinkage cracking under constrained conditions, which seriously affects the durability of concrete. The shrinkage, deformation and cracking of cement concrete has been widely concerned in the engineering field, and it has also reached a consensus in theory to use expansive materials to co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B7/28
CPCC04B7/28Y02P40/10
Inventor 陆安群田倩张守治李华王育江徐文
Owner JIANGSU SOBUTE NEW MATERIALS
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