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Modified calcium oxide expanding clinker as well as preparation method and application thereof

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 weak shrinkage compensation ability, fast hydration speed, poor weathering resistance and moisture resistance of calcium oxide expanded clinker, and is easy to obtain , long shelf life, significant social and economic benefits

Active Publication Date: 2015-06-03
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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  • Modified calcium oxide expanding clinker as well as preparation method and application thereof
  • Modified calcium oxide expanding clinker as well as preparation method and application thereof
  • Modified calcium oxide expanding clinker as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

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

[0044] Grind and crush 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 in the reaction vessel and place it in the holding furnace; it contains 80% SO 2 , 20% O 2 After a period of aeration reaction, take out the reaction vessel containing the calcium oxide expanded clinker; after cooling, weigh the modified mass of the calcium oxide expanded clinker to determine the calcium sulfate package amount. The volume of the mixed gas is 0.04L / min per 1L of the holding furnace, and the reaction temperature is 100°C.

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

[0046]

[0047]

[0048] Table 2 shows the effect of different reaction time of sulfation modifi...

Embodiment 2

[0061] (1) Preparation of sulphated coated modified calcium oxide expanded clinker (using industrially produced sulfur-containing tail gas and commercially available calcium oxide expanded clinker as raw material).

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

[0063] Use industrially produced sulfur-containing ta...

Embodiment 3

[0076] (1) Preparation of sulfated packaged modified calcium oxide expanded clinker (using commercially available calcium oxide expanded clinker as raw material)

[0077] Weigh 120.0g of CaO clinker into a 500ml three-necked round-bottomed flask containing absolute ethanol. The middle mouth of the three-necked round bottom flask is equipped with a PTFE stirrer. Will absorb 98% H 2 SO 4 The dropper is inserted into one side mouth of the three-necked 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 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, the modified calcium oxide swelled clinker is dried at 80-105°C through filtration, and the sulfated packaged modified calcium oxide swelled clinker is separated from the organic solvent.

[0078] Table 6 shows the chemical composition 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: 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 building material concrete admixtures, and particularly relates to a modified calcium oxide type expanded clinker, a preparation method and application thereof. Background technique [0002] Concrete material is a kind of building material with rich sources of raw materials and can absorb industrial waste, low energy consumption and cost, and can be used in combination with steel bars in the largest amount and most versatile. However, due to its low ultimate elongation rate, it is easy to shrink and crack under the effects of dry shrinkage, creep, temperature, etc., resulting in leakage of concrete projects and corrosion of steel bars, which seriously affects the durability of structures. The shrinkage-compensating concrete prepared with expansion agent is one of the effective technical ways to solve the shrinkage and cracking of concrete materials. [0003] Using the expansion component in the expansion agent ...

Claims

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Application Information

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Patent Type & Authority Applications(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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