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A modified calcium oxide cement concrete expansion agent and its preparation method

A technology of cement concrete and calcium oxide, which is applied in the field of building material concrete admixtures, can solve problems such as excessive consumption of expansion energy, and achieve the effects of reducing dosage, reducing cost, and high expansion performance

Active Publication Date: 2017-07-25
JIANGSU SOBUTE NEW MATERIALS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Aiming at the problem that the hydration of calcium oxide-based expansive clinker is too fast and the calcium oxide-based expansive clinker consumes too much expansion energy in the plastic stage of concrete, the invention provides a modified calcium oxide-based cement concrete expansion agent and a preparation method thereof

Method used

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  • A modified calcium oxide cement concrete expansion agent and its preparation method
  • A modified calcium oxide cement concrete expansion agent and its preparation method
  • A modified calcium oxide cement concrete expansion agent and its preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0031] Limestone with a mass ratio of 90:10 is mixed with a composite mineralizer and then ground together by a ball mill to a fineness of 200m 2 / kg of raw meal powder, in which the compound mineralizer is gypsum. The ground raw meal powder was calcined at 1200°C, and kept at this temperature for 120 minutes (that is, the calcination time at 1200°C was 120 minutes). Fineness is 200m 2 / kg to obtain calcium oxide expansion clinker.

[0032] Add the prepared calcium oxide-based expanded clinker into the dichloromethane solution of DuPont ethylene-vinyl acetate copolymer 150, the mass ratio of calcium oxide to ethylene-vinyl acetate copolymer is 999:1, and remove after stirring for 5 minutes. Solvent dichloromethane, the obtained solid is ground to a specific surface area of ​​500m 2 / kg, sealed and packaged to obtain the modified calcium oxide cement concrete expansion agent 1 of the present invention.

[0033] As a comparison, the above-mentioned calcium oxide-based expand...

Embodiment 2

[0035] Limestone with a mass ratio of 99:1 is mixed with a composite mineralizer and then ground together by a ball mill to a fineness of 100m 2 / kg of raw meal powder, wherein the composite mineralizer is gypsum / alumina / aluminum sulfate with a mass ratio of 50:25:25. The ground raw meal powder is calcined at 1350°C, and kept at this temperature for 60 minutes. After the heat preservation is completed, the fired sample is immediately taken out and quenched in the air, and ground to a fineness of 100m 2 / kg to obtain calcium oxide expansion clinker.

[0036] Add the prepared calcium oxide expansion clinker into the chloroform solution of Dupont ethylene-vinyl acetate copolymer 880 in the United States, the mass ratio of calcium oxide to ethylene-vinyl acetate copolymer is 99:1, and remove after stirring for 5 minutes. Solvent trichloromethane, the obtained solid is ground to a specific surface area of ​​600m 2 / kg, sealed and packaged to obtain the modified calcium oxide ceme...

Embodiment 3

[0039] Mix the limestone with a mass ratio of 95:5 and the composite mineralizer, and then grind them together with a ball mill to a fineness of 600m 2 / kg of raw meal powder, wherein the composite mineralizer is gypsum / aluminum sulfate / alumina with a mass ratio of 30:50:20. Calcinate the ground raw meal powder at 1450°C, and keep it at this temperature for 40 minutes. After the heat preservation is over, take out the fired sample and quench it in the air, and grind it to a fineness of 600m 2 / kg to obtain calcium oxide expansion clinker.

[0040] Add the prepared calcium oxide expansion clinker into the tetrahydrofuran solution of Sumitomo Chemical F2021, the mass ratio of calcium oxide to ethylene-vinyl acetate copolymer is 98:2, remove the solvent tetrahydrofuran after stirring for 15 minutes, and the obtained solid is ground to a specific surface area of ​​450m 2 / kg, sealed and packaged to obtain the modified calcium oxide cement concrete expansion agent 3 of the presen...

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Abstract

The invention provides a modified calcium oxide expansion agent for cement concrete and a preparation method of the modified calcium oxide expansion agent. The modified calcium oxide expansion agent for the cement concrete is prepared from an ethylene-vinyl acetate copolymer and calcium oxide expansion clinker, wherein the surface of the calcium oxide expansion clinker is coated with the ethylene-vinyl acetate copolymer, and the ethylene-vinyl acetate copolymer accounts for 0.05-10% the total mass of the modified calcium oxide expansion agent for the cement concrete; the specific surface area of the calcium oxide expansion clinker is 100-600m<2> / kg. According to the modified calcium oxide expansion agent for the cement concrete, provided by the invention, the hydration process of the calcium oxide clinker can be adjusted, the invalid hydration of a plastic stage of the concrete is reduced, the hardened expansion quantity is increased, and the shelf life of the expansion agent product is prolonged; the expansion agent can be applied to the crack resisting and seepage prevention of a concrete structure and can be used for greatly improving the durability of the concrete.

Description

technical field [0001] The invention belongs to the technical field of concrete admixtures for building materials, in particular to a modified calcium oxide cement concrete expansion agent and a preparation method thereof. Background technique [0002] Cement concrete is currently the largest building material in the world, with low price and wide application. However, cement concrete is easy to shrink and crack, and the cracks will cause the steel bars in the concrete to corrode, shorten the service life of the engineering structure, and seriously affect the durability of the concrete. In order to solve the problem that cement concrete is easy to shrink and crack, researchers have invented expansive cement or cement concrete expansion agent. [0003] Since the invention of expansive cement in France in the 1930s, especially since Japan separated the expansive component on the basis of expansive cement as a separate expansion agent, the concrete expansive agent has graduall...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B22/06
Inventor 王瑞陆安群张守治程俊李华姚婷蒋永菁
Owner JIANGSU SOBUTE NEW MATERIALS
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