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Modified calcium oxide cement concrete expansion agent and preparation method thereof

A technology of cement concrete and calcium oxide, which is applied in the field of concrete building materials, can solve problems such as excessive consumption, and achieve the effects of easy availability of raw materials, reduction of early shrinkage, and improvement of durability

Active Publication Date: 2015-06-17
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 calcium oxide expansion agent has strong hygroscopicity, reacts rapidly with water, and consumes too much expansion energy in the plastic stage of concrete, the present invention provides a modified calcium oxide cement concrete expansion agent and a preparation method thereof. Calcium oxide cement concrete expansion agent can adjust the hydration process of calcium oxide expansion clinker, reduce the invalid expansion of concrete in the plastic stage, and increase the expansion rate of concrete after hardening

Method used

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  • Modified calcium oxide cement concrete expansion agent and preparation method thereof
  • Modified calcium oxide cement concrete expansion agent and preparation method thereof
  • Modified calcium oxide cement concrete expansion agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] 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 100% 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.

[0034] Add the prepared calcium oxide expansion clinker into the BS-460 dichloromethane solution of Sanki Company, the mass ratio of calcium oxide to acrylic resin is 99:1, remove the solvent dichloromethane after stirring for 5min, and the obtained solid is powdered Grind until the specific surface area is 500m 2 / kg, sealed and packaged to obtain the modified calcium oxide cement concrete expansion agent 1 of the present invention.

[0035] As a comparison, the above-mentioned calcium oxide-based expanded clinker without surface modific...

Embodiment 2

[0037] 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.

[0038] Add the obtained calcium oxide expansion clinker into the chloroform solution of B-60 of Rohm and Haas, the mass ratio of calcium oxide and acrylic resin is 95:5, remove the solvent chloroform after stirring for 5min, the obtained solid Grinding 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.

[0039] As a comp...

Embodiment 3

[0041] 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.

[0042] Add the obtained calcium oxide expansion clinker into the tetrahydrofuran solution of B-72 of Rohm and Haas, the mass ratio of calcium oxide and acrylic resin is 90:10, remove the solvent tetrahydrofuran after stirring for 15min, and the gained solid is ground to The specific surface area is 450m 2 / kg, sealed and packaged to obtain the modified calcium oxide cement concrete expansion agent 3 of the present invention.

[0043] As ...

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Abstract

The invention provides a modified calcium oxide cement concrete expansion agent and a preparation method thereof. The modified calcium oxide cement concrete expansion agent consists of acrylic resin and a calcium oxide expansion clinker, wherein the surface of the calcium oxide expansion clinker is wrapped with the acrylic resin; the mass of the acrylic resin accounts for 0.01 to 10 percent of the total mass of the modified calcium oxide cement concrete expansion agent; the specific surface area of the modified calcium oxide cement concrete expansion agent is 100 to 600m<2> / kg. According to the modified calcium oxide cement concrete expansion agent, a hydration process of the calcium oxide expansion clinker can be regulated, ineffective hydration in the plastic stage of concrete can be reduced, expansion after hardening can be increased, and the shelf life of the expansion agent product can be prolonged; the modified calcium oxide cement concrete expansion agent can be used for the crack resistance and seepage resistance of a concrete structure, and the durability of the concrete can be greatly improved.

Description

technical field [0001] The invention belongs to the field of concrete 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 gradually developed into the larg...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B22/06
Inventor 王瑞李磊李司晨李华姚婷张小磊赵焕起
Owner JIANGSU SOBUTE NEW MATERIALS
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