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Method for maintaining porous concrete through carbon dioxide

A porous concrete and carbon dioxide technology, applied in ceramic molding machines, manufacturing tools, etc., can solve the problems of high energy consumption of steam curing, long curing cycle, and high energy consumption of concrete, achieve rapid strength development, low porosity, and curb the greenhouse effect. Effect

Inactive Publication Date: 2015-01-21
HUNAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Compared with steam curing, this method saves energy and has less environmental pollution, but it does not fundamentally solve many problems such as high energy consumption and long curing period of steam curing
Traditional steam curing of concrete requires high energy consumption. For example, steam curing of an ordinary concrete block requires about 2300kJ of energy, and steam curing of a lightweight concrete block requires about 2500kJ of energy. Therefore, how to reduce energy consumption in the curing process and shorten the concrete curing time Periodicity and improving the quality of porous concrete blocks are important topics of current research

Method used

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  • Method for maintaining porous concrete through carbon dioxide
  • Method for maintaining porous concrete through carbon dioxide
  • Method for maintaining porous concrete through carbon dioxide

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Embodiment 1

[0022] This embodiment includes the following steps:

[0023] (1) Mixed molding of concrete: the coarse aggregate is crushed stone, the specimen is pressed and molded, and the molding pressure is 16Mpa, and the initial concrete embryo is obtained;

[0024] (2) Put the initial concrete body obtained in step (1) into the pre-curing device for pre-curing. The pre-curing temperature is 25°C, the relative humidity is 60%, and the blower is used to circulate the air. The pre-curing time is 10 hours;

[0025] (3) When the pre-cured mixture embryo reaches the predetermined remaining water-cement ratio of 0.35, put CO 2 In the curing container, vacuumize, the vacuum time is 5min, the maximum negative pressure is 0.05MPa, and keep at the maximum negative pressure for 5min; 2 gas for CO 2 For curing, the volume concentration of carbon dioxide gas is 60%, and the curing time for carbon dioxide is 3 hours. After the curing is completed, the gas is released and the curing is stopped.

[...

Embodiment 2

[0030] This embodiment includes the following steps:

[0031] (1) Mixed molding of concrete: the bulk density of the porous concrete block is set at 1200kg / m 3 , the foaming agent dosage is 2.5%; the concrete is prepared according to the mixing ratio of 0.28 and 0.35 respectively for the water-cement ratio, and the mixing mechanism is selected for 6 minutes; Embryo;

[0032] (2) Put the initial concrete body obtained in step (1) into the pre-curing device for pre-curing. The pre-curing temperature is 20°C, the relative humidity is 50%, and the fan is used to circulate the air. The pre-curing time is 6 hours;

[0033] Make the remaining water-cement ratio 0.05-0.35;

[0034] (3) When the pre-cured mixture embryo reaches the predetermined remaining water-cement ratio, put CO 2 In the curing container, evacuate for 10 minutes, evacuate to -0.09MPa, and keep it at the maximum negative pressure for 5 minutes; then introduce CO 2 gas for CO 2 For curing, the volume concentratio...

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Abstract

The invention discloses a method for maintaining porous concrete through carbon dioxide. The method includes the following steps: (1) concrete is mixed and formed; (2) an obtained initial concrete body is placed into a pre-maintenance device for pre-maintenance, wherein the pre-maintenance temperature ranges from 15 DEG C to 25 DEG C, and the relative humidity ranges from 50% to 70%; air circulates through an air blower or a fan, wherein the pre-maintenance time ranges from 1 h to 18 h; (3) when the residual water-cement ratio of the mixed material body obtained after pre-maintenance reaches a preset residual water-cement ratio, the mixed material body is placed into a CO2 maintenance container, vacuumizing is carried out, then CO2 gas is led into the CO2 maintenance container for CO2 maintenance, the gas is discharged after maintenance is completed, and maintenance is stopped. By means of the method, control over the moisture content of the concrete body can be achieved, the carbon dioxide gas absorption capacity of the concrete can be effectively improved, and the quality of a concrete product can be effectively improved; in addition, the waste greenhouse effect gas, namely the carbon dioxide gas can be effectively used, the emission of the greenhouse gas can be reduced, the environment can be protected, and the greenhouse effect can be suppressed.

Description

technical field [0001] The invention relates to a method for maintaining porous concrete, in particular to a method for using CO 2 A method for the production of porous concrete blocks for construction. Background technique [0002] At present, the maintenance of porous concrete blocks mostly adopts steam curing, that is, the green body is cured in a closed curing kiln. The walls, doors, windows and roof of the curing kiln need to be heat-insulated and waterproofed. Steam pipes are installed on both sides of the kiln, and Install a temperature probe in the middle of the curing kiln. Steam curing is divided into four processes: static stopping, heating, constant temperature and cooling. The static stopping time is equivalent to the initial setting time of cement. Generally, it is about 1 hour in summer, and it is appropriately extended in winter. The heating time is related to the heating rate, which is generally The temperature is 30°C / h, the constant temperature time is g...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B28B11/24
CPCB28B11/245
Inventor 史才军涂贞军黄政宇种霖霖谢昭彬
Owner HUNAN UNIV
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