Cement reinforcing agent, preparation method, and application thereof

A technology for cement reinforcing agent and cement mortar, applied in the field of cement reinforcing agent and preparation, can solve the problems of affecting the mechanical strength of hardened cement slurry, reducing the rheological properties of freshly mixed cement slurry, affecting the effect of pozzolanic reaction, etc., and reducing free hydroxyl groups. number, the effect of improving composition and microstructure, good compatibility and adsorption

Inactive Publication Date: 2016-03-02
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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  • Abstract
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Problems solved by technology

[0003] Industrial by-products such as fly ash contain a large amount of silica, which can be extracted by a wet process. However, due to the presence of a large number of silanol groups on the surface of the silica produced by the wet process, these groups are easy to aggregate and agglomerate in the cement slurry, which is difficult to extract. Uniform dispersion will not only affect the effect of pozzolanic reaction with calcium oxide, but also reduce the rheological properties of freshly mixed cement slurry and affect the mechanical strength of hardened cement slurry [Kong Deyu. Adding nano-silica to the performance of freshly mixed and hardened cement-based materials The influence of [J]. Journal of Zhejiang University of Technology, 2012,3(40):308-312]

Method used

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  • Cement reinforcing agent, preparation method, and application thereof
  • Cement reinforcing agent, preparation method, and application thereof
  • Cement reinforcing agent, preparation method, and application thereof

Examples

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preparation example Construction

[0038] The preparation method of cement reinforcing agent comprises the following steps:

[0039](1) Fully disperse 100 parts by mass of wet-process silica in deionized water under the action of an anionic surfactant with a mass fraction of 1 to 2% relative to silica to form a uniform water phase reaction system, wherein the mass ratio of wet-process silica to deionized water is 1:5-12;

[0040] (2) Add the alcohol solution of silane coupling agent dropwise to the reaction system, the dropping rate is 4-7mL / min, the mass concentration of silane coupling agent / organic alcohol solution is 1.0-2.5g / g, the silane coupling agent alcohol The mass ratio of solution addition amount to wet process white carbon black is 1.11~1.56g / g;

[0041] (3) Keep the reaction system at 70-80°C for 3.5-4.5 hours to obtain modified wet-process silica;

[0042] (4) The modified wet-process silica is baked at 80°C for 12 hours to obtain the product.

[0043] Anionic surfactants include one of sodium...

example 1

[0052] The mass parts of the raw materials for the preparation of the cement reinforcing agent of this example are composed as follows: relative to 100 parts by weight of wet-process silica, 750 parts of deionized water, 5 parts of aminopropyltriethoxysilane, dodecylsulfonic acid 1 part of sodium, 5 parts of ethanol;

[0053] Preparation Process:

[0054] (1) Fully disperse wet-process white carbon black in deionized water under the action of sodium dodecylsulfonate according to the formula quantity to form a uniform water phase reaction system;

[0055] (2) Dissolving aminopropyltriethoxysilane in ethanol to obtain an alcohol solution of aminopropyltriethoxysilane according to the formula quantity;

[0056] (3) Add the alcoholic solution of aminopropyltriethoxysilane dropwise to the water phase reaction system, the dropping speed is 4~7mL / min, the addition amount of the alcoholic solution of aminopropyltriethoxysilane is the same as that of wet process whitening The mass ra...

example 2

[0060] The difference between this example and Example 1 is that the mass parts of the raw materials for the preparation of the cement reinforcing agent are composed as follows: relative to 100 parts by weight of white carbon black, 800 parts of deionized water, 7.5 parts of aminopropyltriethoxysilane, dodecyl 1.2 parts of sodium sulfonate, 8.0 parts of ethanol;

[0061] The preparation process of this embodiment is the same as Product Example 1.

[0062] The cement reinforcing agent prepared in this example is named 7.5% KS55, and the physical properties of 7.5% KS55 are determined: DBP is 2.60mL·g -1 , with a density of 1.5513g·cm -3 , the number of surface hydroxyl groups is 1.87mM·g -1 .

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Abstract

The invention discloses a cement reinforcing agent, a preparation method, and application thereof. The cement reinforcing agent is synthesized by using an amino silane coupling agent for modifying a wet-process-produced white carbon black product through a chemical coupling reaction. Relative to 100 parts by weight of wet-process white carbon black, the chemical modification process needs 500-1300 parts by weight of deionized water, 1-15 parts of a silane coupling modifier, 1-2 parts of an anionic surfactant, and 10-30 parts of an organic solvent. A national standard GB/T17671-1999 method is employed, the addition amount of the product is only 1.0-2.0 parts relative to the cement mass, and compared with 7-day strength of black cement, the strength is improved by about 30 times.

Description

technical field [0001] The invention belongs to the technical field of surface modification of inorganic materials and cement mineral admixture, and relates to a cement reinforcing agent, a preparation method and an application thereof. Background technique [0002] Cement is one of the main building materials in our country at present. In the process of rapid economic development in our country, the requirements for the amount and quality of cement are constantly increasing. Cement admixture is a necessary technical means to save resources, reduce cement cost and improve cement performance. Among them, the cement reinforcing agent is an admixture that can harden the cement and improve the mechanical strength of the cement and concrete during the production process of the silicate in the cement solidification. At present, some cement reinforcing agents, such as graphene, diatomaceous earth and triethanolamine, etc., have complicated preparation process, relatively high cost...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B22/06
Inventor 孟晓荣付东会王磊白光辉王熙霍姗姗王兴国李俊峰
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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