A low water-cement ratio cement-based board and its preparation process and application

A technology of preparation process and water-cement ratio, which is applied to low-water-cement ratio cement-based materials and its preparation process and application field, can solve problems such as impact, achieve the effect of reducing moisture content and overcoming uneven mixing

Active Publication Date: 2022-07-08
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Aiming at the deficiencies in the above-mentioned prior art, the problem to be solved in the present invention is how to realize the uniform mixing of cement and water under the condition of low water-cement ratio, and prepare high-strength cement-based materials, so as to avoid excessively high or too low water-cement ratio. The effect of the contradiction of coming and going on the properties of cement-based substrates

Method used

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  • A low water-cement ratio cement-based board and its preparation process and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] A preparation process of a low water-cement ratio cement-based board, comprising the following steps:

[0036] (1) 5 parts of water and 25 parts of absolute ethanol are mixed, and stirred for 5min at a speed of 200r / min to form a uniform aqueous ethanol solution;

[0037] (2) mixing 60 parts of cement with the ethanol aqueous solution prepared in step (1), and stirring at a rate of 90r / min for 10min to form a uniform cement slurry;

[0038] (3) the cement slurry obtained in step (2) is formed under a hot press after being placed in a mold, the molding pressure is 12MPa, the heating temperature is 50°C, and the pressure holding time is 20min, and then the obtained cement slurry is placed at a temperature of 25 ℃ and relative humidity of 73% for 20 hours of curing.

Embodiment 2

[0040] A preparation process of a low water-cement ratio cement-based board, comprising the following steps:

[0041] (1) 7 parts of water and 20 parts of absolute ethanol were mixed, and stirred for 5min at a rate of 180r / min to form a uniform aqueous ethanol solution;

[0042] (2) mixing 50 parts of cement with the ethanol aqueous solution prepared in step (1), and stirring for 8min at a rate of 100r / min to form a uniform cement slurry;

[0043] (3) the cement slurry obtained in step (2) is formed under a hot press after being placed in a mold, the molding pressure is 10MPa, the heating temperature is 60°C, and the pressure holding time is 20min, and then the obtained cement slurry is placed at a temperature of 25 ℃, the relative humidity of 75% of the environment curing for 24 hours, that is.

Embodiment 3

[0045] A preparation process of a low water-cement ratio cement-based board, comprising the following steps:

[0046] (1) 6 parts of water and 28 parts of absolute ethanol are mixed, and stirred for 5min at a rate of 180r / min to form a uniform aqueous ethanol solution;

[0047] (2) Mix 70 parts of cement with the ethanol aqueous solution prepared in step (1), stir at a rate of 90 r / min for 10 minutes to form a uniform cement slurry, and then place the cement slurry in a 40° C. environment to dry to a mass drop of about 5%. stop heating;

[0048] (3) the cement slurry obtained after the heat treatment in step (2) is placed in a mold and then molded under a hot press, the molding pressure is 15MPa, the heating temperature is 55°C, and the pressure holding time is 30min, and then the obtained cement slurry is placed in a hot press. Cured for 18 hours in an environment with a temperature of 25°C and a relative humidity of 65%.

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Abstract

The invention belongs to the technical field of cement board preparation, and in particular relates to a low water-cement ratio cement-based board and its preparation process and application. The process steps are: 1) mixing water and absolute ethanol, and stirring to form an ethanol aqueous solution; in this step, a part of ethanol is replaced by water, which not only reduces the amount of water, but also does not affect the subsequent uniform mixing of cement and water. 2) The cement and the ethanol aqueous solution are evenly stirred to form a cement slurry; in this step, the ethanol aqueous solution is used to replace the solution of only using water to prepare the cement slurry in the traditional method, so as to facilitate the reduction of the water content in the subsequent cement board; 3) The cement slurry is mixed. It is formed under the condition of hot pressure, and then the obtained cement slurry is cured, that is, it is obtained. In the invention, the water is dispersed in a large amount of anhydrous ethanol, which is conducive to the stirring with cement, and the volatile characteristics of anhydrous ethanol are used for heating in the later stage, so that the anhydrous ethanol is volatilized and separated from water, thereby overcoming the uneven mixing of water and cement under low water-cement ratio. the problem.

Description

technical field [0001] The invention belongs to the technical field of cement board preparation, and in particular relates to a low water-cement ratio cement-based board and its preparation process and application. Background technique [0002] The information disclosed in this Background of the Invention is only for enhancement of understanding of the general background of the invention and should not necessarily be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person of ordinary skill in the art. [0003] The existing cement-based board has a relatively high initial water-cement ratio, and the cement hydration water demand is low. After the cement-based board is hardened, the space originally occupied by free water will form voids. Therefore, the existing cement-based board is a porous hardened body, its porosity is as high as 20-30%, and the pore size continuously changes from 5nm-250μm, resulting in low...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/04C04B28/06
CPCC04B28/04C04B28/065C04B2201/50C04B24/02C04B24/005Y02W30/91
Inventor 芦令超闫振李来波陈明旭程新
Owner UNIV OF JINAN
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