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

A technology of expanded clinker and calcium oxide, which is applied in the field of building material concrete admixtures, can solve the problems of weak shrinkage compensation ability, fast hydration speed, poor weathering resistance and poor moisture resistance of calcium oxide type expanded clinker, and is easy to obtain. , long shelf life, easy to promote the effect of application

Active Publication Date: 2017-01-18
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 Carbonated 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

[0040] (1) Preparation of carbonation-coated modified calcium oxide expansion clinker (using commercially available calcium oxide expansion clinker as raw material)

[0041] Commercially available calcium oxide expanded clinker is ground and crushed into a specific surface area of ​​350m 2 / kg of powder. Weigh 200g of clinker powder and put it into the reaction kettle and place it in the electric furnace; heat the furnace to the reaction temperature, and pass a certain humidity of CO 2 gas; when the temperature in the furnace drops to normal temperature, take out the reaction kettle filled with calcium oxide expansion clinker; weigh the quality of the modified calcium oxide expansion clinker to determine the degree of carbonation reaction and the amount of calcium carbonate generated. CO 2 The gas flow rate is 0.1L / min relative to the volume of 1L electric furnace, the reaction temperature is 110°C, the reaction time is 5min, 10min, 15min, and 30min, and the relative humidit...

Embodiment 2

[0058] (1) Preparation of carbonation-coated modified calcium oxide-based expanded clinker (mixed with limestone and composite mineralizer as raw material)

[0059] Mix limestone and compound mineralizer with a mass ratio of 90:10 (sample 2-1), 92:8 (sample 2-2) and 95:5 (sample 2-3) and grind them together with a ball mill to a fineness of 200m 2 / kg of raw meal powder, in which the composite mineralizer is composed of 50% gypsum and 50% copper slag. The ground raw meal powder was calcined at 1300°C, and kept at this temperature for 1 hour. After the heat preservation was completed, the fired sample was immediately taken out and quenched in the air, and the specific surface area was 250m2 after grinding. 2 / kg of calcium oxide expanded clinker powder. The reaction temperature of carbon dioxide gas and calcium oxide expanded clinker powder is 190° C., and the reaction time is 10 minutes. Except for the above, the carbonation surface treatment process is carried out in the sa...

Embodiment 3

[0074] (1) Preparation of carbonation-coated modified calcium oxide expansion clinker (using 6 types of calcium oxide expansion clinker as raw materials)

[0075] Six commercially available calcium oxide-based expanded clinkers were subjected to carbonation surface treatment. CO 2 The flow rate of gas is 0.05L / min relative to the volume of 1L electric furnace, the reaction temperature is 50°C, the reaction time is 15min, and the relative humidity of the gas is controlled at RH85%-90%. Except the above, the carbonation surface treatment process was carried out in the same manner as in Example 1.

[0076] Table 7 shows the chemical composition (wt.%) of the commercially available calcium oxide expanded clinker.

[0077]

[0078]

[0079] Table 8 shows the effect of carbonation modification on the coating amount of calcium carbonate on the surface of six commercially available calcium oxide-based expanded clinker powders (500g).

[0080]

[0081] Note: The amount of c...

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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: grinding a calcium oxide expanding clinker till a certain grain size, putting the calcium oxide expanding clinker powder in a carbon dioxide atmosphere with certain humidity and forming plenty of dense calcium carbonate on the surface of the expanding clinker powder, 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 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 clinker 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 a wide range of sources and low prices. With the rapid development of concrete science and technology, concrete materials are more and more widely used in various construction projects. However, cement concrete is prone to shrinkage and cracking. Among them, temperature drop shrinkage and drying shrinkage are the two most important forms of shrinkage, which seriously affect the durability of concrete. [0003] The shrinkage, deformation and cracking of concrete has been widely concerned by the engineering community, and it is theoretically agreed to use expansive materials to compensate for the shrinkage of concrete. It is one of the important measures to reduce the cracking of co...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B22/14
Inventor 刘加平田倩陆安群张守治李磊王育江
Owner JIANGSU SOBUTE NEW MATERIALS
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