A modified calcium oxide expanded clinker, its preparation method and application

A technology of expanding clinker and calcium oxide, which is applied in the field of building materials and concrete admixtures, can solve the problems of calcium oxide expanding clinker such as weathering resistance, poor moisture resistance, fast hydration speed, and weak shrinkage compensation ability, etc. Significant benefits, long shelf life, and easy access to results

Active Publication Date: 2017-05-17
JIANGSU SOBUTE NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] Aiming at the problems in the prior art that the hydration rate of calcium oxide expansion clinker is fast, the early expansion is rapid, the ability to compensate for the contraction in the middle and later stages is weak, and the calcium oxide expansion clinker has poor weathering resistance and moisture resistance, etc., the present invention provides A Sulfated Surface Coated Modified Calcium Oxide Expanded Clinker

Method used

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  • A modified calcium oxide expanded clinker, its preparation method and application
  • A modified calcium oxide expanded clinker, its preparation method and application
  • A modified calcium oxide expanded clinker, its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] (1) Preparation of modified calcium oxide expanded clinker by sulfated coating (using commercially available calcium oxide expanded clinker as raw material)

[0044] Grinding and crushing commercially available calcium oxide expanded clinker into a specific surface area of ​​300m 2 / kg of powder. Weigh 100g of expanded clinker powder, spread it flat in the reaction vessel and place it in the holding furnace; it contains 80% SO 2 , 20%O 2 After a period of ventilating reaction, take out the reaction container with calcium oxide expansion clinker; after cooling, weigh the modified quality of calcium oxide expansion clinker to determine the amount of calcium sulfate package. The volume of the mixed gas per 1 L of the holding furnace was 0.04 L / min, and the reaction temperature was 100°C.

[0045] Table 1 shows the chemical composition (wt.%) of the commercially available calcium oxide-based expanded clinker.

[0046]

[0047]

[0048] Table 2 shows the effect of ...

Embodiment 2

[0061] (1) Preparation of modified calcium oxide-based expanded clinker by sulfated coating (use industrially produced sulfur-containing tail gas, and commercially available calcium oxide-based expanded clinker as raw material).

[0062] my country is a big coal-burning country, and coal accounts for 75% of the total primary energy consumption. The massive consumption of energy has caused serious air pollution, the most prominent of which is SO 2 Acid rain hazards caused by gas emissions. At present, my country's total sulfur dioxide emission ranks first in the world, and the economic loss caused by sulfur dioxide pollution is more than 100 billion yuan. Expansion of clinker with calcium oxide and SO in exhaust gas 2 On the one hand, it achieves the purpose of calcium-based desulfurization and fixation, and reduces pollution; on the other hand, it improves the expansion performance of calcium oxide-based expansion clinker.

[0063] Using industrially produced sulfur-contain...

Embodiment 3

[0076] (1) Preparation of sulfation-coated modified calcium oxide expanded clinker (using commercially available calcium oxide expanded clinker as raw material)

[0077] Weigh 120.0g of CaO clinker and put it into a 500ml three-necked round-bottomed flask filled with absolute ethanol. A polytetrafluoroethylene stirrer was installed in the middle of the three-neck round bottom flask. will absorb the full concentration of 98% H 2 SO 4 Insert the dropper into one side port of the three-neck flask. The stirrer stirs the CaO clinker at 150r / min; at the same time, the concentrated H in the dropper 2 SO 4 Slowly titrate into the CaO clinker. Through physical adsorption and chemical reaction, a large amount of dense calcium sulfate is formed on the surface of CaO expanded clinker powder. Then filter and dry the modified calcium oxide expanded clinker at 80-105 DEG C to separate the sulfated coated modified calcium oxide expanded clinker from the organic solvent.

[0078] Table ...

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Abstract

The invention relates to a modified calcium oxide expanding clinker as well as a preparation method and application thereof. The preparation method of the modified calcium oxide expanding clinker comprises the following steps: forming a dense calcium sulfate layer on the surface of an expanding clinker through reaction between sulfur dioxide gases or sulfuric acid and the calcium oxide expanding clinker, thus preparing the modified calcium oxide expanding clinker. The modified calcium oxide expanding clinker can be mixed with a dispersion supporter, thus forming a modified calcium oxide concrete expansive agent. The sulfated packing modified calcium oxide expanding clinker prepared by the preparation method and the expansive agent thereof have the beneficial effects that the expansion quantity and expansion stress of the expanding material in cement concrete are obviously increased, thus optimizing the expansion processes of the expanding clinker and the expansive agent thereof; the weather resistance and moisture resistance of the calcium oxide expanding clinker and the expansive agent thereof are improved.

Description

technical field [0001] The invention belongs to the technical field of concrete admixtures for building materials, and in particular relates to a modified calcium oxide expansion clinker, its preparation method and its application. Background technique [0002] Concrete is a building material with abundant raw materials, the ability to absorb industrial waste, low energy consumption and cost, and the largest and most versatile building materials that can be used in combination with steel bars. However, due to its low ultimate tensile rate, it is easy to shrink and crack under the effects of drying shrinkage, creep, temperature, etc., resulting in leakage of concrete engineering and corrosion of steel bars, which seriously affects the durability of structures. Shrinkage-compensating concrete prepared with expansion agent is one of the effective technical approaches to solve shrinkage cracking of concrete materials. [0003] It is an important measure to prevent the shrinkage...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B22/14
Inventor 田倩陆安群张守治王育江王瑞程骏
Owner JIANGSU SOBUTE NEW MATERIALS
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