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

A technology of cement concrete and calcium oxide, applied in the field of building material concrete admixtures, can solve problems such as excessive consumption, and achieve the effects of overcoming structural leakage, improving durability and increasing expansion energy

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

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Problems solved by technology

[0007] Aiming at the problem that calcium oxide-based expansive clinker reacts rapidly with water, and the expansion energy of calcium oxide-based expansive clinker is consumed too much in the plastic stage of concrete, the present invention provides a modified calcium oxide-based cement concrete expansion agent and a preparation method thereof, Reduce its invalid expansion in the plastic stage of concrete and increase the expansion energy of concrete after hardening

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

[0027] 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.

[0028] Add the prepared calcium oxide expanded clinker into a solution of polyethylene glycol in dichloromethane with a number average molecular weight of 5kg / mol, calcium oxide and PEG 4K The mass ratio is 99:1, after stirring for 5min, the solvent dichloromethane is removed, and the gained 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.

[0029] As a comparison, the above-mentioned calcium oxide-based expanded clin...

Embodiment 2

[0031] 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.

[0032] Add the prepared calcium oxide-based expanded clinker into the chloroform solution of polyacrylamide with a number average molecular weight of 10kg / mol, the mass ratio of calcium oxide to polyacrylamide is 80:20, and remove the solvent trichloromethane after stirring for 5 minutes. Methane, the obtained solid is ground to a specific surface area of ​​600m 2 / kg, sealed and packaged to obtain the modified calcium oxide cem...

Embodiment 3

[0035] 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.

[0036] The obtained calcium oxide expanded clinker was added into a tetrahydrofuran solution of polymethacrylic acid with a number average molecular weight of 50kg / mol, the mass ratio of calcium oxide and polymethacrylic acid was 90:10, and the solvent tetrahydrofuran was removed after stirring for 15min. The obtained solid is ground to a specific surface area of ​​450m 2 / kg, sealed and packaged to obtain the modified calcium oxide cemen...

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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 has the specific surface area of 100-600m<2> / kg and is prepared from a water-soluble macromolecular organic polymer and calcium oxide expansion clinker, wherein the surface of the calcium oxide expansion clinker is coated with the water-soluble macromolecular organic polymer, and the water-soluble macromolecular organic polymer accounts for 1-20% the total mass of the modified calcium oxide expansion agent for the cement concrete. According to the expansion agent for the cement concrete, provided by the invention, the invalid hydration of a plastic stage of the concrete is reduced, and the hardened expansion quantity is increased; the expansion agent can be applied to the crack resisting and seepage prevention of a concrete structure and is used for greatly improving the durability of the concrete structure.

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. [0003] 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 gradual...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B22/06
Inventor 王瑞程俊陆安群田倩张守治李华张建亮
Owner JIANGSU SOBUTE NEW MATERIALS
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