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Polymer cement-based material as well as preparation method and application thereof

A technology of cement-based materials and polymers, applied in the direction of additive processing, etc., can solve the problems of high cost, sacrifice of compressive strength, complex process, etc., and achieve good mechanical properties, good interlayer bonding performance, and short initial setting time Effect

Inactive Publication Date: 2020-07-03
UNIVERSITY OF MACAU
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the cost of the first two methods is too high and the process is complicated, so it is difficult to promote them on a large scale.
The ready-mixed cement reported by J.J.Assaad (Construction and Building Materials, 163 (2018) 139-148) belongs to the third method, which has made great achievements in flexural strength. Great improvement, but at the expense of compressive strength

Method used

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  • Polymer cement-based material as well as preparation method and application thereof
  • Polymer cement-based material as well as preparation method and application thereof
  • Polymer cement-based material as well as preparation method and application thereof

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preparation example Construction

[0054] In view of this, the application proposes a new preparation method of polymer cement-based materials, which includes the following steps: mixing the mixed solution of the initiator system and acrylate monomer with the cement-based material and making the acrylate monomer in the cement-based material In-situ polymerization is carried out to obtain in-situ polymerized polymer cement-based materials.

[0055] This method innovatively uses the method of in-situ polymerization of specific monomers to add acrylate polymers to cement-based materials, ensuring the compatibility of the two (acrylate polymers and cement-based materials) networks without reducing In the case of high compressive strength, the flexural strength of the cement itself is greatly improved, and the setting time is greatly shortened.

[0056] As an optional range, the content of the acrylate polymer in the polymer cement-based material can be 2-10wt% of the cement-based material, such as 2wt%, 3wt%, 4wt%,...

Embodiment 1

[0081] This embodiment provides a kind of in-situ polymerized polymer cement-based material preparation:

[0082] (1) Dissolve the sodium hydroxide solid gradually in water (amount of water-cement ratio of 0.4), until completely dissolved and cooled to room temperature.

[0083] (2) Add equimolar mass of acrylic acid into the above-mentioned cooled sodium hydroxide solution, and stir until the reaction is completely carried out to obtain a sodium acrylate monomer solution.

[0084] (3) Place the above-mentioned acrylic acid monomer solution in an ice-water mixture at 0°C, and add ammonium persulfate (APS), sodium sulfite and N-N'-methylenebisacrylamide in sequence, and stir until completely dissolved. Wherein, the consumption of ammonium persulfate is 2.5wt% of acrylic acid monomer, the consumption of sodium sulfite is 2.5wt% of acrylic acid monomer, and the consumption of N-N'-methylenebisacrylamide is 0.1wt% of acrylic acid monomer.

[0085] (4) Dry mix cement (525 grade) a...

Embodiment 2

[0088] This embodiment provides a kind of in-situ polymerized polymer cement-based material preparation:

[0089] (1) Dissolve the sodium hydroxide solid gradually in water (amount of water-cement ratio of 0.3), until completely dissolved and cooled to room temperature.

[0090] (2) Add equimolar mass of acrylic acid into the above-mentioned cooled sodium hydroxide solution, and stir until the reaction is completely carried out to obtain a sodium acrylate monomer solution.

[0091](3) Put the above-mentioned acrylic acid monomer solution in an ice-water mixture at 0°C, and add potassium persulfate, sodium bisulfite and N-N'-methylenebisacrylamide in sequence, and stir until completely dissolved. Wherein, the consumption of potassium persulfate is 1wt% of acrylic acid monomer, the consumption of sodium sulfite is 2wt% of acrylic acid monomer, and the consumption of N-N'-methylenebisacrylamide is 0.05wt% of acrylic acid monomer.

[0092] (4) Add the mixed solution of the initia...

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Abstract

The invention provides a polymer cement-based material as well as a preparation method and application thereof, and belongs to the technical field of building materials. The preparation method comprises the following steps: mixing a mixed solution of an initiating system and an acrylate monomer with a cement-based material, and making the acrylate monomer carry out in-situ polymerization in the cement-based material to form another network interlaced with a cement hydration product, thereby obtaining the in-situ polymerized polymer cement-based material. The method is simple and convenient tooperate, and in-situ polymerization of the acrylate monomer is carried out in a cement-based system, so that the compatibility between two networks of the polymer-based cement is ensured, and the polymer cement-based material with interpenetrating interlaced network characteristics is obtained. The polymer cement-based material has high flexural strength and adjustable setting time while the compressive strength is not affected. The polymer cement-based material can be applied to 3D printing, dam construction, wall plate manufacturing and concrete pavement slab manufacturing.

Description

technical field [0001] The invention relates to the technical field of building materials, in particular to a polymer cement-based material and its preparation method and application. Background technique [0002] Cement / cement-based materials are widely used as an indispensable cementitious material in infrastructure projects, but due to their own fatal flaws, the cement matrix is ​​easy to crack, resulting in reduced durability and shortened service life. In recent years, how to improve the flexural strength of cement-based materials has become one of the research hotspots in the cement / cement-based field. [0003] One of the ways to improve the flexural strength of cement-based materials is to introduce some high-toughness, high-bending materials. Among them, the use of fibers to enhance the performance of cement-based materials has become one of the most commonly used methods in academia and industry, including natural fibers and man-made fibers. For example, Shah, S.P...

Claims

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Application Information

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IPC IPC(8): C08F220/06C08F222/38C08F2/44C08K13/08C08K3/00C08K3/34C08K7/26C08K11/00C04B28/04B33Y70/10
CPCC08F220/06C08F2/44C08K13/08C08K3/00C08K3/34C08K7/26C08K11/005C04B28/04B33Y70/00C04B2201/50C04B2201/52C08F222/385C04B18/08C04B18/146C04B18/141C04B24/2641
Inventor 李宗津陈斌猛孙国星梁瑞
Owner UNIVERSITY OF MACAU