CN113200729A - Steel slag-doped aerated concrete - Google Patents
Steel slag-doped aerated concrete Download PDFInfo
- Publication number
- CN113200729A CN113200729A CN202110549191.7A CN202110549191A CN113200729A CN 113200729 A CN113200729 A CN 113200729A CN 202110549191 A CN202110549191 A CN 202110549191A CN 113200729 A CN113200729 A CN 113200729A
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- CN
- China
- Prior art keywords
- steel slag
- aerated concrete
- cement
- doped
- amount
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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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
- C04B28/08—Slag cements
- C04B28/082—Steelmaking slags; Converter slags
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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
- C04B28/14—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 calcium sulfate cements
Abstract
The invention discloses steel slag-doped aerated concrete, which is characterized in that steel slag is used for replacing cement in a calcareous raw material of the aerated concrete, and the replacement amount of the steel slag is 20-50% of the original cement amount in the aerated concrete according to weight percentage. The invention has the characteristics of reducing the use amount of cement in the calcium raw material of the aerated concrete, expanding the resource utilization of the steel slag, reducing the emission pollution amount and having lower preparation cost.
Description
Technical Field
The invention relates to aerated concrete, in particular to aerated concrete doped with steel slag.
Background
The aerated concrete is a light porous silicate product prepared by taking siliceous materials and calcareous materials as main raw materials, adding a gas former, and carrying out the processes of batching, stirring, pouring, pre-curing gas forming, cutting, steaming and pressing and the like. After wall improvement and popularization for many years, aerated concrete becomes the leading novel wall material in China and is widely applied to building engineering. The aerated concrete mainly comprises two series of cement-lime-sand and cement-lime-fly ash, wherein the cement and the lime are calcareous materials and account for about 30-35%, and the sand and the fly ash are siliceous materials and account for about 60-70%. The cement and the lime are industrial products with high energy consumption and high emission, and the usage amount of the cement and the lime in the aerated concrete industry is huge every year.
Steel slag is a solid waste discharged from steel mills when smelting crude steel. The utilization rate of steel slag in China is low, only 20-30%, and the storage amount of the steel slag which is not utilized in the past year is more than 10 hundred million t; with the increasing of domestic steel yield, the discharge amount of the steel slag is increased, and the resource utilization of the steel slag is urgent. At present, the bulk resource utilization approach of the steel slag is mainly used as a road-building backfill material, cement or concrete admixture, but the volume expansion caused by the delayed hydration of free calcium oxide and free magnesium oxide at normal temperature limits the application development of the steel slag due to the possibly-caused volume stability problem.
The steel slag mainly comprises the chemical components of CaO 40-60%, MgO 3-10%, SiO 24-12%, Fe2O 32-8%, MnO 1-8%, Al2O 32-8%, TiO 21-4%, P2O 51-3% and the like. The main mineral compositions of the steel slag comprise tricalcium silicate, dicalcium silicate, calcium forsterite, calcium magnesium roseptite, dicalcium ferrite, RO (solid solution formed by oxides of magnesium, iron and manganese, namely FeO, MgO and MnO), free calcium oxide, free magnesium oxide and the like. It is seen that the steel slag contains minerals such as calcium silicate similar to portland cement, has a certain hydraulic property, but has a low activity at normal temperature.
Disclosure of Invention
The invention aims to provide the steel slag-doped aerated concrete, which is used for reducing the consumption of cement in the calcareous raw material of the aerated concrete and has the characteristics of expanding the resource utilization of the steel slag, reducing the emission pollution and lowering the preparation cost.
In order to achieve the purpose, the invention provides the following technical scheme:
the steel slag-doped aerated concrete has steel slag to replace cement in calcium material, and the steel slag replacing amount is 20-50 wt% of the original cement in aerated concrete.
As a further scheme of the invention, the steel slag calcium chloride is added in an amount of 2-4% of the weight of the steel slag.
As a further scheme of the invention, the steel slag is ground to 350m of specific surface area after iron removal2Over/kg of steel slag powder.
Compared with the prior art, the steel slag is used for replacing a part of cement and is used as the calcium raw material of the aerated concrete, the calcium source in the steel slag is fully utilized, the use amount of the cement in the aerated concrete production is greatly reduced, the resource utilization amount of the steel slag is increased, and the use amount of the cement with larger carbon emission is reduced. The calcium chloride is used as the activity excitant of the steel slag, so that the hydration reaction activity of the steel slag can be improved.
In the production process of aerated concrete, the temperature of slurry during stirring and pouring is usually controlled to be 35-42 ℃, the gas generation and static maintenance stage releases heat along with the rapid hydration of lime in the slurry, the temperature of the slurry can reach 70-90 ℃, the higher temperature of the slurry is beneficial to the hydration reaction of silicate minerals which are difficult to hydrate in the steel slag at normal temperature, and the hydration activity of the silicate minerals relative to cement is improved. The autoclaved curing temperature of the aerated concrete is 180-215 ℃ and the steam pressure is 10-20kg/cm2The high temperature and high pressure in the still kettle are beneficial to the hydration of free calcium oxide and free magnesium oxide in the steel slag, and further react with siliceous materials to form high-temperature silicate hydration products; meanwhile, the problem of possible volume stability of the steel slag in normal temperature application is also solved. In a word, the conditions of the production process of the aerated concrete are beneficial to exerting the potential activity of the steel slag and overcoming the defects of the steel slag, and the aerated concrete is a favorable place suitable for recycling the steel slag.
Therefore, the application of the steel slag in the aerated concrete not only avoids the problem of delayed expansion of free calcium oxide and free magnesium oxide which are easy to appear when the steel slag is used at normal temperature, but also is beneficial to the exertion of the potential activity of the steel slag. By adopting the technical scheme of the invention, only a steel slag bin is added in the original aerated concrete production line, and the materials are fed in parallel with cement lime during batching, so that the original preparation process is not changed, the original aerated concrete production line is slightly modified, the improvement cost is low, the operation steps are simple and convenient, and the method is suitable for large-scale application.
Therefore, the invention has the characteristics of expanding the resource utilization of the steel slag, reducing the emission pollution amount and having lower preparation cost.
Detailed Description
The present invention is further illustrated by the following examples, which are not to be construed as limiting the invention.
Example (b):
the steel slag-doped aerated concrete has steel slag to replace cement in calcium material, and the steel slag replacing amount is 20-50 wt% of the original cement in aerated concrete.
For example: when the aerated concrete without steel slag is prepared by the following original material scheme: according to the weight percentage, 20 percent of cement, 15 percent of lime, 62 percent of sand or fly ash and 3 percent of gypsum; the technical scheme (30 percent of steel slag instead of cement) of the invention is as follows: according to the weight percentage, the cement is 14 percent, the steel slag is 6 percent, the lime is 15 percent, the sand or the fly ash is 62 percent, and the gypsum is 3 percent. In order to better activate the activity of the steel slag, calcium chloride (dissolved in water firstly) with the dosage of 3 percent of the steel slag can be added as an active activator of the steel slag. The aerated concrete production line only needs to be additionally provided with a steel slag bin, the materials are fed in parallel with the cement lime during proportioning, and the production process is the same as that of the original aerated concrete.
After iron is removed, the steel slag is ground until the specific surface area is 350m2Over/kg of steel slag powder.
After the technical scheme of the invention is adopted, the strength of the autoclaved aerated concrete is similar to that of the original aerated concrete without steel slag.
Claims (3)
1. The steel slag-doped aerated concrete is characterized in that: the steel slag is used for replacing cement in the calcium raw material of the aerated concrete, and the replacement amount of the steel slag is 20-50% of the original cement amount in the aerated concrete according to the weight percentage.
2. The steel slag-doped aerated concrete according to claim 1, which is characterized in that: also comprises calcium chloride which is added in an amount of 2 to 4 percent of the weight of the steel slag.
3. The steel slag-doped aerated concrete according to claim 1, which is characterized in that: after iron is removed, the steel slag is ground until the specific surface area is 350m2Over/kg of steel slag powder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110549191.7A CN113200729A (en) | 2021-05-20 | 2021-05-20 | Steel slag-doped aerated concrete |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110549191.7A CN113200729A (en) | 2021-05-20 | 2021-05-20 | Steel slag-doped aerated concrete |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113200729A true CN113200729A (en) | 2021-08-03 |
Family
ID=77032046
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110549191.7A Pending CN113200729A (en) | 2021-05-20 | 2021-05-20 | Steel slag-doped aerated concrete |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113200729A (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101468900A (en) * | 2007-12-28 | 2009-07-01 | 同济大学 | Method for formulating masonry mortar and surface mortar for steam aerated concrete |
| WO2014092667A1 (en) * | 2012-12-14 | 2014-06-19 | Özsüt Mustafa | Pozzolan-quicklime binder |
| CN105130215A (en) * | 2015-08-18 | 2015-12-09 | 湖北湖大天沭新能源材料工业研究设计院有限公司 | Steel slag micro powder used for aerated concrete calcareous material, and preparation method thereof |
-
2021
- 2021-05-20 CN CN202110549191.7A patent/CN113200729A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101468900A (en) * | 2007-12-28 | 2009-07-01 | 同济大学 | Method for formulating masonry mortar and surface mortar for steam aerated concrete |
| WO2014092667A1 (en) * | 2012-12-14 | 2014-06-19 | Özsüt Mustafa | Pozzolan-quicklime binder |
| CN105130215A (en) * | 2015-08-18 | 2015-12-09 | 湖北湖大天沭新能源材料工业研究设计院有限公司 | Steel slag micro powder used for aerated concrete calcareous material, and preparation method thereof |
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| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20210803 |
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| WD01 | Invention patent application deemed withdrawn after publication |