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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 materials, can solve the problem of high consumption of expansion energy, and achieve the effects of simple preparation process, increased expansion, and compensation for deformation and shrinkage

Active Publication Date: 2017-11-03
JIANGSU SOBUTE NEW MATERIALS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the problem that calcium oxide-based expansive clinker reacts quickly with water and consumes too much expansion energy in the plastic stage of concrete, the present invention provides a modified calcium oxide-based cement concrete expansive agent and a preparation method thereof, which can adjust the calcium oxide-based expansive clinker. The hydration process of the material can reduce the invalid expansion of calcium oxide expansion clinker in the plastic stage of concrete, and increase the effective expansion of concrete after hardening, especially in the temperature drop stage.

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

[0030] 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.

[0031] Add the prepared calcium oxide-based expanded clinker into the dimethyl sulfoxide / dichloromethane solution of polyvinyl alcohol 1788, the mass ratio of calcium oxide to polyvinyl alcohol is 99:1, remove the solvent after stirring for 5 minutes, and obtain a solid Grinding 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.

[0032] As a comparison, the above-mentioned calcium oxide-based expanded clinker without surface modificat...

Embodiment 2

[0034] 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.

[0035] Add the prepared calcium oxide expansion clinker into the chloroform solution of polyvinyl alcohol 1795, the mass ratio of calcium oxide to polyvinyl alcohol is 80:20, remove the solvent chloroform after stirring for 5 minutes, and the obtained solid is ground Up to a specific surface area of ​​600m 2 / kg, sealed and packaged to obtain the modified calcium oxide cement concrete expansion agent 2 of the present invention. ...

Embodiment 3

[0038] 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.

[0039] The obtained calcium oxide expanded clinker is added to polyvinyl alcohol In the tetrahydrofuran solution of PVA-103, the mass ratio of calcium oxide to polyvinyl alcohol is 90:10, the solvent tetrahydrofuran is removed 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 present ...

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Abstract

The invention provides a modified calcium oxide expansive agent used for cement concrete and a preparation method thereof. The modified calcium oxide expansive agent used for cement concrete comprises polyvinyl alcohol and a calcium oxide expanding clinker, wherein the surface of the calcium oxide expanding clinker is coated with polyvinyl alcohol. The modified calcium oxide expansive agent used for cement concrete has the beneficial effects that the hydration process of the calcium oxide expanding clinker can be regulated; invalid hydration at the plastic stage of concrete is reduced, the expansion quantity after hardening is increased and the shelf life of the product is prolonged; the modified calcium oxide expansive agent used for cement concrete can be used for crack and seepage resistance of a concrete structure and can substantially improve the durability of concrete.

Description

technical field [0001] The invention belongs to the field of 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, which shortens the service life of engineering structures and seriously affects the durability of concrete. In order to solve the problem that cement concrete is easy to shrink and crack, researchers have invented expansive cement and cement concrete expansion agent. 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 gradually developed into the largest amount used in the concrete industry. One of the admixtures, it is widely used in...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B24/24
Inventor 王瑞程俊陆安群田倩王伟李华王文彬
Owner JIANGSU SOBUTE NEW MATERIALS
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