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Minimum inflation high magnesium moderate heat cement, production method therefor and applications thereof

A production method and micro-expansion technology, which is applied in the field of building materials, can solve the problems of inability to guarantee the deformation and shrinkage of concrete autogenous volume, and achieve the effects of improving volume stability and safety, compensating shrinkage, and reducing cracks

Active Publication Date: 2014-03-05
CHINA BUILDING MATERIALS ACAD
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

In the current medium-heat Portland cement standard, although it is stipulated that if the pressure steaming stability is qualified, the amount of MgO can be relaxed to 6%, but in actual production control, due to the interaction between the MgO content and the requirements for strength and heat of hydration The reason for the restriction is that the amount of MgO generally does not exceed 5%, and even if the amount of MgO in the cement is increased to 4-5% in actual application, it is still not guaranteed to reduce the autogenous volume deformation and shrinkage of concrete during use.

Method used

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  • Minimum inflation high magnesium moderate heat cement, production method therefor and applications thereof
  • Minimum inflation high magnesium moderate heat cement, production method therefor and applications thereof
  • Minimum inflation high magnesium moderate heat cement, production method therefor and applications thereof

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preparation example Construction

[0028] The preparation of a specific micro-expansion high-magnesium medium-heat cement may comprise the following steps:

[0029] 1) Dry the calcium raw material, silicon raw material, aluminum raw material, iron raw material, magnesium raw material, calibration raw material and clinker activator in the dryer until the water content is less than 2%, and then grind to 0.08mm The sieve residue is less than 10.0%;

[0030] 2) Uniformly mix various powders according to the ratio of raw materials to obtain cement raw meal;

[0031] 3) Put the cement raw meal into the rotary kiln, use bituminous coal with a calorific value higher than 5200kJ / kg or mix bituminous coal and anthracite as fuel, and calcine in the kiln at a calcination temperature of 1400-1450°C (excluding 1450°C), and the calcination time 20-70min;

[0032] 4) Cool the calcined cement clinker to obtain micro-expansion high-magnesium medium-heat cement clinker with periclase controlled at 2-8%;

[0033] 5) Grind micro...

Embodiment 1-7

[0037] Example 1-7, preparation of micro-expansion high-magnesium medium-heat cement with periclase controlled at 2-8%

[0038] The proportioning ratio of raw materials of embodiment 1-7 and comparative example is as shown in table 1:

[0039] Table 1 Raw material proportions of micro-expansion high-magnesium medium-heat cement and comparative examples in Examples 1-7 (unit: parts by weight)

[0040]

[0041]

[0042] The preparation of micro-expansion high-magnesium medium-heat cement includes the following processes:

[0043] 1) Dry the calcium raw material, silicon raw material, aluminum raw material, iron raw material, magnesium raw material, calibration raw material and clinker activator in the dryer until the water content is less than 2%, and then grind to 0.08mm The sieve residue is less than 10.0%;

[0044] 2) According to the ratio shown in Table 1, mix various powders evenly to obtain cement raw meal. After testing, the weight percentage of oxides in each co...

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Abstract

The invention discloses a kind of minimum inflation high magnesium moderate heat cement, a production method therefor and applications thereof. The cement is prepared from calcium raw materials, silicon materials, aluminum raw materials, iron raw materials, magnesium raw materials, correction raw materials and clinker activating agents through two-grinding and one-burning process. The content of MgO in the clinkers is raised to 6-9%, the content of periclase is controlled to 2-8%, the minimum inflation performance of periclase can be used fully, the contraction of mass concrete can be compensated, concrete cracks can be decreased, and therefore the volume stability and safety of concrete are raised.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to the composition and preparation of a micro-expansion high-magnesium medium-heat cement. Background technique [0002] At present, the general-purpose cement is Portland cement series, which is made of appropriate raw materials, designed with appropriate ratio and composition, and then processed through the process of "two grindings and one burning". It is the most widely produced and used hydraulic adhesive. condensate material. For a long time, the chemical composition and mineral composition of Portland cement have basically remained unchanged, and the technical development is mainly the improvement of production technology and equipment. [0003] Although Portland cement is widely used, with the continuous large-scale development of infrastructure, when Portland cement is used in large-volume concrete, especially hydraulic concrete in water conservancy ...

Claims

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Application Information

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IPC IPC(8): C04B7/06
Inventor 刘云王显斌马忠诚刘超文寨军颜碧兰刘克忠魏丽颖
Owner CHINA BUILDING MATERIALS ACAD
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