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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 materials, can solve problems such as excessive consumption, and achieve the effects of overcoming structural leakage, improving durability, and reducing ineffective hydration

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 the calcium oxide-based expansion agent reacts rapidly with water and the expansion energy 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. The modified calcium oxide-based cement Concrete expansion agent can adjust the hydration process, reduce the invalid expansion of concrete in the plastic stage, and increase the effective expansion 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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Embodiment 1

[0034] 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). 500m 2 / kg to obtain calcium oxide expansion clinker.

[0035] Add the prepared calcium oxide-based expansion clinker into the dichloromethane solution of vinyltrimethoxysilane, the mass ratio of calcium oxide to vinyltrimethoxysilane is 999:1, stir at 40°C for 120min; add acrylic acid A mixture of methyl esters, styrene and acrylic acid monomers, the total mass ratio of calcium oxide to polymerized monomers is 998:2, free radical polymerization at 40°C for 5 hours, the organic solvent is removed after cooling down, and the obtained solid is ground to a specific surface area of 500m 2 / kg, sealed and pack...

Embodiment 2

[0038]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.

[0039] Add the prepared calcium oxide expansion clinker into the ethanol solution of vinyltriethoxysilane, the mass ratio of calcium oxide to vinyltriethoxysilane is 995:5, stir at 80°C for 10min; add formaldehyde A mixture of methyl acrylate, butenedioic acid and acrylic acid monomers, the total mass ratio of calcium oxide to polymer monomers is 995:5, free radical polymerization at 90°C for 1 hour, and the organic solvent is rem...

Embodiment 3

[0042] 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.

[0043] Add the prepared calcium oxide expanded clinker into the trichloromethane solution of vinyl tris (β-methoxyethoxy) silane, the mixture of calcium oxide and vinyl tris (β-methoxyethoxy) silane The mass ratio is 99:1, stirring at 60°C for 60 minutes; adding a mixture of butyl acrylate, methyl methacrylate, styrene and acrylic acid monomers, the total mass ratio of calcium oxide to acrylate monomers is 99:1, 70 Free radical polymeriza...

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Abstract

The invention provides a modified calcium oxide cement concrete expansion agent and a preparation method thereof. The modified cement concrete expansion agent is composed of silane coupling agent bonded acrylic acid polymer and calcium oxide expansion clinker; wherein the mass percentage of silane coupling agent in the modified cement concrete expansion agent is 0.1%-10% The mass percentage of the acrylic acid polymer in the modified cement concrete expansion agent is 0.1%-10%. The modified calcium oxide cement concrete expansion agent of the present invention can reduce the ineffective hydration of concrete in the plastic stage, increase the expansion amount after hardening, prolong the shelf life of expansion agent products, and improve the crack resistance and impermeability of concrete structures, greatly Improves 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, 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 of easy shrinkage and cracking of cement concrete, researchers invented expansive cement and 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 largest amount u...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B24/42
Inventor 王瑞张守治程俊李司晨王育江陆安群王伟
Owner JIANGSU SOBUTE NEW MATERIALS
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