CN101139182A - Carbonization maintenance aerated concrete - Google Patents

Carbonization maintenance aerated concrete Download PDF

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Publication number
CN101139182A
CN101139182A CNA200710017006XA CN200710017006A CN101139182A CN 101139182 A CN101139182 A CN 101139182A CN A200710017006X A CNA200710017006X A CN A200710017006XA CN 200710017006 A CN200710017006 A CN 200710017006A CN 101139182 A CN101139182 A CN 101139182A
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Prior art keywords
carbonization
gas
aerated concrete
maintenance
carbonized
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CNA200710017006XA
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CN100465121C (en
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常钧
黄世峰
叶正茂
刘福田
周宗辉
程新
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Jinan University
University of Jinan
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University of Jinan
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    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
    • C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
    • C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
    • C04B28/08—Slag cements
    • C04B28/082—Steelmaking slags; Converter slags

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Inorganic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)

Abstract

The present invention relates to a carbonized maintained aerated concrete prepared by utilizing steel slag and cements to absorb the carbon dioxide gas. The carbonized maintenance aerated concrete is manufactured by adopting the following method: the steel slag or cement containing carbonized components can be taken as raw materials, the air-entraining agents and the water are added in the raw materials. After being mixed uniformly, the generated mixtures are pressed and manufactured into the aerated concrete. Under the maintenance of the carbonized gas, the aerated concrete is made into the carbonized maintained aerated concrete; the weight percentage that the carbonized components take in the raw materials is no less than 20 percent; the carbonized gas is the carbon dioxide gas; the maintain conditions are that the concentration of the carbon dioxide is larger than wt15 percent, the pressure of the curing gas is larger than 1bar and the carbonization and maintenance temperature ranges from 30 to 200 Celsius system. The industrial waste gas is utilized for the technology, thus reducing the exhaust of the greenhouse gas, the carbon dioxide, preparing the aerated concrete products with good performance and shortening the production cycle. The beneficial effects of the present invention are that the waste is utilized, the environment is protected, the energy is saved and the cost is low.

Description

Carbonization maintenance aerated concrete
(1) technical field
The present invention relates to a kind of material of construction gas concrete, particularly is the carbonization maintenance aerated concrete of main raw absorbing carbon dioxide gas preparation by slag, cement.
(2) background technology
Because the increase of population and human production activity's scale are increasing, to the carbonic acid gas (CO of atmosphere release 2), carbon monoxide (CO) isothermal chamber gas constantly increases, and causes atmospheric composition to change.Air quality is affected, and weather has the trend that warms gradually.Because global warming will produce various influence to the whole world, higher temperature can make polar glacier melt, and sea level will raise 6 centimetres in per 10 years, thereby some seashore areas will be submerged.Global warming also may have influence on the variation of rainfall and general circulation, makes adverse weather, easily causes drought and waterlogging, and these all may cause the ecosystem to change and destroy, and Global climate change will produce a series of great effects to the human lives.
The inventor has applied for a kind of method of preparing building material with carbonization maintenance waste, and the waste that will contain the carbonization composition is a char-forming material, at carbonization gas CO 2Maintenance under, make the material of construction finished product.Because the work in-process that waste is made are solid construction, carbonization gas is slower to the char-forming material internal penetration, and its carbonization time is longer, and carbonization is not thorough, has influenced the carbonization effect.
Gas concrete is to adopt material of construction to mix with air, makes the inner gas concrete of hollow structure that is.The gas concrete that adopts aforesaid method to make, its set time is long, and the intensity after the curing is not high.The gas concrete that particularly adopts materials such as waste cement or slag to make, its intensity is lower.
(3) summary of the invention
The present invention is in order to overcome the deficiency of above technology, a kind of carbonization maintenance aerated concrete is provided, this technology has been utilized industrial gaseous waste, reduced discharge of carbon dioxide greenhouse gas, prepared well behaved aerated concrete products, shorten the production cycle, and had sharp useless, environmental protection, energy-conservation, characteristics that cost is low.
The present invention realizes by following measure:
The present invention relates to a kind of carbonization maintenance aerated concrete, be to adopt following method to make: utilize the slag or the cement that contain the carbonization composition to be raw material, add air and water, mix, be pressed into gas concrete, gas concrete is made carbonization maintenance aerated concrete under the maintenance of carbonization gas;
Described carbonization composition be calcium oxide, calcium hydroxide, Dicalcium Phosphate (Feed Grade), tricalcium silicate, hydrated calcium silicate, drated calcium aluminate, hydrated calcium ferrite, ettringite, magnesium hydroxide and magnesian one or more, the weight percent that the carbonization composition accounts for raw material is no less than 20%;
Described carbonization gas is for being carbon dioxide;
Described curing condition: gas concentration lwevel is greater than wt15%, and the maintenance gaseous tension is greater than 1bar, 30-200 ℃ of carbonized maintaining temperature.
Carbonization maintenance aerated concrete of the present invention, described curing time is preferably 2-24 hour.
Carbonization maintenance aerated concrete of the present invention, described carbonization gas is preferably carbonated industrial gaseous waste, and gas concentration lwevel is wt20-50%.
Carbonization maintenance aerated concrete of the present invention, the weight percent that described carbonization composition accounts for raw material is preferably 40-70%.
The invention discloses calcium oxide, calcium hydroxide, Dicalcium Phosphate (Feed Grade), tricalcium silicate, hydrated calcium silicate, drated calcium aluminate, hydrated calcium ferrite, ettringite, magnesium hydroxide and the magnesium oxide etc. that utilize cement and slag to contain and can be carbonized composition, through carbonized maintaining, following reaction takes place:
CaO+H 2O+CO 2＝CaCO 3+H 2O
MgO+H 2O+CO 2＝MgCO 3+H 2O
3CaO·SiO 2+3CO 2+μH 2O→SiO 2·μH 2O+3CaCO 3
2CaO·SiO 2+2CO 2+μH 2O→SiO 2·μH 2O+2CaCO 3
Char-forming material of the present invention contain the calcium oxide that can be carbonized, calcium hydroxide, Dicalcium Phosphate (Feed Grade), tricalcium silicate, hydrated calcium silicate, magnesium hydroxide and etc. composition.
The main generation of carbonized maintaining material behind carbonized maintaining consists of lime carbonate and magnesiumcarbonate.
The present invention is under the condition that has suitable quantity of water to exist, through CO 2 waste gas maintenance aerated concrete base substrate.When carburizing reagent takes place after, system generation thermopositive reaction, system temperature is because of different char-forming materials reach 30-200 ℃, makes the system moisture evaporation, the ambient moisture height.Carburizing reagent takes place in the gas concrete char-forming material under the carbonized maintaining condition, generate carbonate, produces intensity.
Carbonization maintenance aerated concrete of the present invention utilizes cement or slag to make gas concrete for raw material through aerating, can be cut into base substrates such as difform brick, plate.Cement also can use the cement waste of cement production enterprise, perhaps building castoff.
The accelerated carbonation of gas concrete is artificially to control the process of accelerated carbonation, and gas concrete is at rich CO 2Under the environment, sclerosis rapidly at short notice.Because gas concrete inside has the space, carbonization gas can easily enter inside concrete, and it is more thorough, more complete, quicker to make carbonization carry out ground.
Utilize carbonized maintaining to prepare gas concrete and can handle carbon dioxide effectively, and bring into play the intensity of gas concrete fast, shortening curing time and production cycle are played the effect of sharp useless environmental protection.
Main points of the present invention are to have invented to utilize the CO 2 waste gas carbonization maintenance aerated concrete.This technology has been utilized industrial gaseous waste, has reduced discharge of carbon dioxide greenhouse gas, has prepared well behaved aerated concrete products, has shortened the production cycle.The invention has the beneficial effects as follows sharp useless, environmental protection, energy-conservation, cost is low.
(4) description of drawings
Fig. 1 is the XRD analysis figure of the char-forming material of the embodiment of the invention 2.
Among the figure, last figure is the XRD analysis figure after the carbonization, and figure below is the XRD analysis figure before the carbonization.1-CaCO 3, 2-Dicalcium Phosphate (Feed Grade) (C 2S), 3-iron calcium aluminate 4-aragonite.Ordinate zou is a diffraction peak intensity, and X-coordinate is an angle of diffraction.
Fig. 2 is the SEM-EDS figure of the char-forming material of the embodiment of the invention 1.
Fig. 3 is the SEM-EDS figure of the char-forming material of the embodiment of the invention 2.
(5) embodiment
Embodiment 1:
Choosing Jinan cement production enterprise production silicate cement is raw material, and its chemical ingredients is: CaO64.81%, SiO 221.58%, Fe 2O 33.20%, Al 2O 34.90%, MgO3.70%, SO 30.52%.
With above-mentioned raw materials and suitable quantity of water, mix, and add an amount of foaming agent and other additives, through mix stirring, pouring foaming, idiosome is quiet stop after, be cut into 76 * 38 * 12mm 3Brick, adopt the industrial gaseous waste contain carbonic acid gas wt 25% to carry out maintenance, the maintenance gaseous tension is 1.5bar, 50-100 ℃ of carbonized maintaining temperature.Through 5 hours maintenance, make finished bricks.
Through carbonized maintaining, it is absorbing carbon dioxide about 14% that the weight of silicate cement gas concrete brick increases; Its ultimate compression strength is: 6.8MPa.
Silicate cement SEM-EDS analysis chart of the present invention as can be seen from Figure, has formed the calcium carbonate crystal of a large amount of 1-2 μ m as shown in Figure 2 in the silicate cement gas concrete after the carbonization.Increase than sic acid salt cement solid brick crystalline size, carbonization efficient improves.
Embodiment 2:
The slag of choosing the discharging of Jinan iron and steel group is a raw material, and its chemical ingredients is: CaO38.91%, SiO 213.32%, Fe 2O 323.11%, FeO 21.62%, Al 2O 31.57%, MgO7.61%, P 2O 51.47%, MnO 22.29%.
With above-mentioned raw materials, add suitable quantity of water, mix, and add an amount of foaming agent and other additives, through mix stirring, pouring foaming, idiosome is quiet stop after, be cut into 76 * 38 * 12mm 3Brick, adopt and to contain the industrial gaseous waste of carbonic acid gas wt more than 25% and carry out maintenance, the maintenance gaseous tension is 2bar, 50-150 ℃ of carbonized maintaining temperature.Through 10 hours maintenance, make finished bricks.
Through carbonized maintaining, it is absorbing carbon dioxide about 13% that the weight of slag increases, and its ultimate compression strength is: 7.2MPa.
XRD analysis figure before and after the above-mentioned char-forming material carbonization as shown in Figure 1, last figure is the XRD analysis figure after the carbonization, figure below is the preceding XRD analysis figure of carbonization.Among the figure, 1-CaCO 3, 2-Dicalcium Phosphate (Feed Grade) (C 2S), 3-iron calcium aluminate 4-aragonite.As can be seen from the figure, after the carbonization, CaCO 3Content obviously improve.
The SEM-EDS figure of above-mentioned char-forming material as shown in Figure 3.From electromicroscopic photograph as can be seen, its calcium carbonate crystal size is about 3-4 μ m, and crystalline size has obvious increase than sic acid salt cement gas concrete brick, illustrates that its carbonization effect is better.
Embodiment 3:
Choose waste and old cement as char-forming material, its chemical ingredients and its weight percent are:
CaO SiO 2 Al 2O 3 Fe 2O 3 MgO Na 2O SO 3 LOSS
58.1 14.8 3.9 2.0 2.0 0.85 3.8 13.8
Above-mentioned raw materials and air and water are mixed, be pressed into gas concrete, be cut into 76 * 38 * 12mm 3Brick, adopt the industrial gaseous waste contain carbonic acid gas wt45% to carry out maintenance, the maintenance gaseous tension is 5bar, 50-100 ℃ of carbonized maintaining temperature.Through 15 hours maintenance, make finished bricks.
Through carbonized maintaining, it is absorbing carbon dioxide about 11% that the weight of slag increases, and its ultimate compression strength is: 5.2MPa.

Claims (4)

1. carbonization maintenance aerated concrete, it is characterized in that adopting following method to make: utilize the slag or the cement that contain the carbonization composition to be raw material, add air and water, mix, be pressed into gas concrete, gas concrete is made carbonization maintenance aerated concrete under the maintenance of carbonization gas;
Described carbonization composition be calcium oxide, calcium hydroxide, Dicalcium Phosphate (Feed Grade), tricalcium silicate, hydrated calcium silicate, drated calcium aluminate, hydrated calcium ferrite, ettringite, magnesium hydroxide and magnesian one or more, the weight percent that the carbonization composition accounts for raw material is no less than 20%;
Described carbonization gas is for being carbon dioxide;
Described curing condition: gas concentration lwevel is greater than wt15%, and the maintenance gaseous tension is greater than 1bar, 30-200 ℃ of carbonized maintaining temperature.
2. carbonization maintenance aerated concrete according to claim 1 is characterized in that: described curing time is 2-24 hour.
3. carbonization maintenance aerated concrete according to claim 1 and 2 is characterized in that: described carbonization gas is carbonated industrial gaseous waste, and gas concentration lwevel is wt20-50%.
4. carbonization maintenance aerated concrete according to claim 1 and 2 is characterized in that: the weight percent that described carbonization composition accounts for raw material is 40-70%.
CNB200710017006XA 2007-08-17 2007-08-17 Carbonization maintenance aerated concrete Expired - Fee Related CN100465121C (en)

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