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High-magnesium minimum-inflation low-heat cement and preparation method thereof

A low-heat cement and micro-expansion technology, applied in the field of cement, can solve the problems of low heat of hydration, low dry shrinkage, concrete cracks, etc., and achieve the effects of low cost, reduced concrete cracks, and simple production process

Active Publication Date: 2013-01-30
CHINA BUILDING MATERIALS ACAD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the shortcoming that existing cement is easy to produce concrete cracks in projects such as high-performance concrete, mass concrete and hydraulic concrete, the purpose of this invention is to provide a kind of cement that can be commonly produced in general cement plants, with low self-hydration heat, Low drying shrinkage, good erosion resistance and wear resistance, especially high magnesium micro-expansion low-heat cement clinker that can improve crack resistance in concrete engineering

Method used

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  • High-magnesium minimum-inflation low-heat cement and preparation method thereof

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Embodiment 2

[0028] The mineral composition of the high-magnesium micro-expansion low-heat cement clinker listed in Example 2 is (percentage by weight): C 3 S (tricalcium silicate) 27.66%, C 2 S (dicalcium silicate) 48.04%, C 3 A (tricalcium aluminate) 2.79%, C 4 AF (tetracalcium aluminoferrite) 14.92%; MgO content in cement clinker is 6.71%. This scheme can be regarded as the most preferred.

[0029] Although the above lists the specific values ​​of each optimal scheme according to Table 2, it can be understood that the listed data changes according to the change of the composition of cement raw materials in actual application, and the fluctuation of the change is normal within the range of ±10%. .

[0030] In the above-mentioned high-magnesium micro-expansion low-heat cement clinker, the proportion of raw materials for forming the mineral composition is (weight percent): 50-80% of calcareous raw materials, 5-30% of clay-based raw materials, 0-10% of iron powder, industrial waste resi...

Embodiment 1-5

[0036] Embodiment 1-5, preparation of high-magnesium micro-expansion low-heat cement

[0037] The raw material formula of the high-magnesium micro-expansion low-heat cement of the embodiment of the present invention 1-5 is as shown in table 1:

[0038] The raw material formula (unit: weight percent) of high-magnesium micro-expansion low-heat cement of table 1

[0039]

[0040] High-activity high-magnesium micro-expansion low-heat cement clinker is produced by conventional methods in a φ2.5×45m five-stage cyclone preheater kiln. The clinker is fine and uniform, with good granulation and no pulverization; The raw material is mixed with gypsum as a retarder to produce high-magnesium micro-expansion low-heat cement.

[0041] See Table 2 for the chemical analysis, rate and mineral composition of the cement clinker prepared in Examples 1-5 and the reference cement.

[0042] Table 2 Chemical analysis, ratio and mineral composition of high-magnesium micro-expansion low-heat cemen...

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Abstract

The invention discloses high-magnesium minimum-inflation low-heat cement and a preparation method thereof. A high-magnesium minimum-inflation low-heat cement clinker comprises the following mineral compositions in percentage by weight: 10-35% of C3S, 40-65% of C2S, 1-5% of C3A, 10-20% of C4AF and 6.0-8.0% of MgO. The concrete prepared by the cement has the characteristics of good liquidity, low water requirement amount, low hydration heat, high long-term strength, good durability and minimum inflation performance, and can be used for compensating the contraction of big-volume concrete and hydraulic concrete and reducing a concrete crack. Compared with the traditional portland cement and the low-heat portland cement, the high-magnesium minimum-inflation low-heat cement is more favorable for realizing the volume stability and the safety of the concrete, and is an ideal cementing material for the major projects, especially the big-volume concrete and hydraulic concrete engineering.

Description

technical field [0001] The invention relates to a cement, in particular to a high-performance high-magnesium micro-expansion low-heat cement which can effectively reduce concrete cracks and can be used in high-performance concrete, mass concrete, hydraulic concrete and other projects and a preparation process thereof. Background technique [0002] During the world energy crisis in the 1970s, with the deepening understanding of the cement industry's high energy resource consumption and relatively serious environmental load, the first research boom of Belite system cement was triggered, but due to failure to solve the high The key technology of stabilization and activation of Belite cement came to an end; the second research climax of Belite system cement began in the late 1980s when the international concrete engineering community attached great importance to the durability of concrete, energy saving, consumption reduction, and environmental protection. And further improving ...

Claims

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Application Information

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IPC IPC(8): C04B7/345
CPCY02P40/10
Inventor 王晶王敏文寨军刘云王显斌刘克忠
Owner CHINA BUILDING MATERIALS ACAD
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