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Concrete admixture and preparation method thereof

A concrete admixture and dispersant technology, applied in the field of concrete processing, can solve the problems of poor chloride ion curing performance, poor early strength effect, etc. Effect

Inactive Publication Date: 2021-04-06
凌池英
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a concrete admixture and its preparation method to solve technical problems such as poor early strength effect and poor chloride ion curing performance.

Method used

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  • Concrete admixture and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0033] A kind of preparation method of concrete admixture, concrete steps are as follows:

[0034] (1) First add the dispersant to water and stir to mix evenly, while stirring, add magnesium nitrate aqueous solution and sodium silicate aqueous solution dropwise at the same time, stir and react for the first time to obtain a nano-magnesium silicate suspension, control the temperature to 35 ° C, and add Add cyclohexane to the nano-magnesium silicate suspension, ultrasonically oscillate to obtain a mixed solution, and then drop the mixed solution and tetraethyl orthosilicate into the premixed solution containing calcium nitrate and ammonia water at the same time, and then stir the reaction for the second time. Under the action of ammonia water, tetraethyl orthosilicate reacts with calcium nitrate and deposits on the surface of nano-magnesium silicate to obtain calcium silicate-magnesium silicate nanoparticles;

[0035] (2) Then the halloysite nanotubes are modified using N-(β-ami...

Embodiment 2

[0052] A kind of preparation method of concrete admixture, concrete steps are as follows:

[0053] (1) First add the dispersant to water and stir to mix evenly, while stirring, add magnesium nitrate aqueous solution and sodium silicate aqueous solution dropwise at the same time, stir and react for the first time to obtain nano-magnesium silicate suspension, control the temperature to 45 ° C, and add Add cyclohexane to the nano-magnesium silicate suspension, ultrasonically oscillate to obtain a mixed solution, and then drop the mixed solution and tetraethyl orthosilicate into the premixed solution containing calcium nitrate and ammonia water at the same time, and then stir the reaction for the second time. Under the action of ammonia water, tetraethyl orthosilicate reacts with calcium nitrate and deposits on the surface of nano-magnesium silicate to obtain calcium silicate-magnesium silicate nanoparticles;

[0054] (2) Then the halloysite nanotubes are modified using N-(β-amino...

Embodiment 3

[0071] A kind of preparation method of concrete admixture, concrete steps are as follows:

[0072] (1) First add the dispersant into water and stir to mix evenly, while stirring, add magnesium nitrate aqueous solution and sodium silicate aqueous solution dropwise at the same time, stir and react for the first time to obtain nano-magnesium silicate suspension, control the temperature to 40 ° C, and add Add cyclohexane to the nano-magnesium silicate suspension, ultrasonically oscillate to obtain a mixed solution, and then drop the mixed solution and tetraethyl orthosilicate into the premixed solution containing calcium nitrate and ammonia water at the same time, and then stir the reaction for the second time. Under the action of ammonia water, tetraethyl orthosilicate reacts with calcium nitrate and deposits on the surface of nano-magnesium silicate to obtain calcium silicate-magnesium silicate nanoparticles;

[0073](2) Then the halloysite nanotubes are modified using N-(β-amin...

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Abstract

The invention provides a concrete admixture and a preparation method thereof. The preparation method comprises the following steps: preparing calcium silicate and magnesium silicate nanoparticles by taking a magnesium nitrate aqueous solution, a sodium silicate aqueous solution, tetraethyl orthosilicate, calcium nitrate and the like as raw materials; modifying the halloysite nanotube by using N-([beta]-aminoethyl-[gamma]-aminopropyl triethoxysilane to obtain a modified halloysite nanotube, and reacting the modified halloysite nanotube with the epoxidized bark powder to obtain modified bark powder; and finally, taking acrylamide and N-(4-aminophenyl)acrylamide as raw materials to carry out polymerization reaction, and adding calcium silicate and magnesium silicate nanoparticles and the modified bark powder in the polymerization process. The concrete admixture is helpful for greatly accelerating early hydration of cement, has a good early strength effect, has a very good adsorption and solidification effect on chloride ions, and prevents concrete from being eroded and damaged by the chloride ions.

Description

technical field [0001] The invention relates to the technical field of concrete processing, in particular to a concrete admixture and a preparation method thereof. Background technique [0002] In the process of concrete preparation, a small amount of special product that can obviously improve the performance of concrete is added, called concrete admixture. The early strength agent is an admixture that accelerates the early hydration of cement and improves the early strength of concrete to meet the requirements of construction and structure. At present, the global economic development is slowing down, and environmental problems are becoming more and more prominent. Accelerate the early hydration of concrete, improve its early strength to improve economic benefits, speed up construction progress, and reduce CO 2 emissions are particularly important. At the same time, with the development of concrete technology, industrial wastes are used as basic raw materials in concrete m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/40
CPCC04B40/0039C04B22/00C04B14/04C04B18/24C04B24/2652C04B24/40C04B24/12C04B24/00C04B22/085C04B22/06
Inventor 凌池英
Owner 凌池英
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