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Aluminate cement resistant to corrosion of sulfate and preparation method thereof

A technology of aluminate cement and sulfate resistance, applied in the field of cement, can solve problems such as cracking of reinforced concrete extension bars, reduction of engineering structure strength, chloride ion penetration, etc., to improve material compactness, reduce firing energy consumption, and reduce The effect of firing temperature

Active Publication Date: 2019-05-31
ZHENGZHOU DENGFENG SMELTING MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

(3) The problem of chloride ion penetration. There are a large number of chloride ions in seawater. The penetration of chloride ions in cement will cause corrosion of steel bars in concrete, thereby cracking reinforced concrete extension bars and reducing the strength of engineering structures.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Example 1: A sulfate-resistant aluminate cement prepared from the following raw materials in parts by weight: 53.82 parts of bauxite fine powder with a particle size of ≤0.75 mm, and 37.18 parts of limestone fine powder with a particle size of ≤0.75 mm , 3.5 parts of α-Al2O3 fine powder with particle size ≤0.05mm, 5 parts of calcium oxide fine powder, and 0.5 part of calcium sulfate fine powder.

[0026] Wherein, the main composition of bauxite and limestone raw material is as follows:

[0027]

[0028] The sulfate-resistant aluminate cement is prepared according to the following steps:

[0029] (1) take the raw material by the parts by weight listed above;

[0030] (2) α-Al 2 o 3 Fine powder and bauxite fine powder, limestone fine powder, calcium sulfate, and calcium oxide fine powder are premixed in a ball mill at a speed of 1000 to 1200 rpm for 30 minutes in a ball mill according to the ratio of corundum balls to materials of 1:1; then Mix the two mixed...

Embodiment 2

[0036] Example 2: A sulfate-resistant aluminate cement prepared from the following raw materials in parts by weight: 53.22 parts of bauxite fine powder with a particle size of ≤0.75 mm, and 36.48 parts of limestone fine powder with a particle size of ≤0.75 mm , 5 parts of α-Al2O3 fine powder with particle size ≤0.05mm, 5 parts of calcium oxide fine powder, and 0.3 part of calcium sulfate fine powder.

[0037] Wherein, the main components of bauxite and limestone raw materials are the same as in Example 1; the preparation method is the same as that in Example 1.

[0038] The main phase composition of the prepared cement clinker is as follows (%):

[0039] CA

[0040] The performance indexes of the obtained product are: the flexural strength of 13.18MPa, the compressive strength of 100.82MPa, and the apparent porosity of the plastic sand is 13.78% after curing in water at 20°C for 28 days. Cured in sodium sulfate at 20°C for 28 days, the flexural strength is 14.65MPa,...

Embodiment 3

[0041] Example 3: A common CA50 aluminate cement was prepared, and compared with the aluminate cements resistant to sulfate attack in Example 1 and Example 2.

[0042] Using 55.82 parts of bauxite fine powder with particle size≤0.75mm and 44.18 parts of limestone fine powder with particle size≤0.75mm as raw materials to prepare aluminate cement, wherein the main components of bauxite and limestone are the same as those in Example 1; The preparation method is the same as that in Example 1.

[0043] The main phase composition of the prepared cement clinker is as follows (%):

[0044] CA

[0045] The performance index of the obtained product is: the flexural strength is 11.49MPa, the compressive strength is 83.60MPa, and the apparent porosity of the plastic sand is 15.33% after curing in water at 20°C for 28 days. Cured in sodium sulfate at 20°C for 28 days, the flexural strength is 11.71MPa, the compressive strength is 91.4MPa, and the apparent porosity of the mortar ...

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Abstract

The invention discloses an aluminate cement resistant to corrosion of sulfate and a preparation method thereof, and aims to provide an aluminate cement, which can prevent corrosion of sulfate in seawater. Innovatively, alumina is added into raw materials of cement, the phase composition of cement clinker is changed, and the phase composition of the cement clinker is controlled. The provided aluminate cement and common aluminate cement are subjected to a sulfate corrosion resisting test under same conditions, and the result shows that the anticorrosion coefficient of the provided aluminate cement is obviously increased.

Description

technical field [0001] The invention relates to the technical field of cement, in particular to a sulfate-resistant aluminate cement and a preparation method thereof. Background technique [0002] Aluminate cement is a hydraulic cementitious material mainly composed of calcium aluminate. It has excellent early strength, high temperature resistance, corrosion resistance and other properties. It can be used for rapid construction, repair and protection of underwater projects. However, due to the The progress of the salt cement hydration reaction will reduce the later strength of the cement, which is not good for the long-term application of the project. As the main material of marine engineering, the durability of concrete in seawater environment is an unavoidable problem. The resistance to chloride ion penetration and sulfate erosion in seawater environment is a problem that needs to be solved when concrete is used in marine environment. Cement is the binder of concrete, and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B7/44C04B7/42C04B7/32
Inventor 王小康王毅董萌蕾刁桂芝史向培孙晓军
Owner ZHENGZHOU DENGFENG SMELTING MATERIALS
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