CN108774073A - A kind of preparation method of the autoclave aerated concrete building block of the silicon oil modified quick lime of addition-calcium carbonate crystal whisker modification blast-furnace cinder - Google Patents
A kind of preparation method of the autoclave aerated concrete building block of the silicon oil modified quick lime of addition-calcium carbonate crystal whisker modification blast-furnace cinder Download PDFInfo
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- CN108774073A CN108774073A CN201810538531.4A CN201810538531A CN108774073A CN 108774073 A CN108774073 A CN 108774073A CN 201810538531 A CN201810538531 A CN 201810538531A CN 108774073 A CN108774073 A CN 108774073A
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- calcium carbonate
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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
-
- 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
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/02—Treatment
- C04B20/023—Chemical treatment
-
- 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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/40—Porous or lightweight materials
-
- 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
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/20—Mortars, concrete or artificial stone characterised by specific physical values for the density
-
- 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
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/30—Mortars, concrete or artificial stone characterised by specific physical values for heat transfer properties such as thermal insulation values, e.g. R-values
- C04B2201/32—Mortars, concrete or artificial stone characterised by specific physical values for heat transfer properties such as thermal insulation values, e.g. R-values for the thermal conductivity, e.g. K-factors
-
- 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
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses the preparation methods that a kind of silicon oil modified quick lime of addition-calcium carbonate crystal whisker is modified the autoclave aerated concrete building block of blast-furnace cinder, cement, gypsum and granite stone powder mixing dry mixing is uniform, it is sent into blender, add hot water stirs, add silicon oil modified quick lime, calcium carbonate crystal whisker is modified blast-furnace cinder, then is sufficiently stirred；Heat water into foaming agent aluminium powder, air entraining agent to stir evenly, be poured into blender and stir evenly, gained slurry is injected into mold, be put into incubator it is quiet stop maintenance after, take out demoulding, cutting is blocking, and the green body of taking-up is sent into the maintenance that still kettle carries out high temperature and pressure；It first heats up, so that reaction kettle is reached scheduled temperature and pressure, then constant temperature, be finally down to room temperature, go out kettle, obtain autoclave aerated concrete building block.The specific strength that autoclaved aerated block can be increased using the compound bleed of aluminium powder-air entraining agent, makes its good frost resistance.Influence of the calcium carbonate crystal whisker to heat preservation construction material heat conductivility is notable, and whisker keeps the cracking resistance of material and heat conductivility excellent.
Description
Technical field
The invention belongs to autoclave aerated concrete building block fields, and in particular to a kind of silicon oil modified quick lime-carbonic acid of addition
Calcium pyroborate is modified the preparation method of the autoclave aerated concrete building block of blast-furnace cinder.
Background technology
With rapid development of economy, construction market is also increasing the demand of stone material year by year, China's stone material
Industry obtains the development advanced by leaps and bounds.Granite building material product is with its higher intensity, hard material,
The features such as dignified thick and heavy, is widely used.The exploitation of granite mineral products and processing of stone industry obtain huge
The environmental problems such as leftover bits accumulation, processing dust, the coolant liquid also brought while development, jeopardize
The health of the periphery people seriously constrains granite industry health and sustainable development.In world's Energy situation day
Beneficial severe today, China is using energy-saving and emission-reduction as a fundamental state policy.The implementation of materials for wall reform
With the proposition of Green Architecture Conception, new requirement is just proposed to building energy conservation.Air-entrained concrete building block it is porous
Structure makes it have the features such as light and good thermal and insulating performance, meets the requirement of novel wall material,
It is widely popularized and is used.Demand with architectural engineering to aerated blocks increases significantly, and is steamed as tradition
Also there is insufficient situation gradually in the flyash of pressure aerated blocks main material.Research shows that granite mine
Stone is similar with the chemical substance of flyash composition, all contains a large amount of SiO2, this is just that granite stone powder substitutes flyash
Possibility is provided to produce autoclave aerated concrete building block.Using granite waste material as siliceous material next life
Production autoclaved aerated block had not only realized the secondary use of waste resource but also had solved growing granite waste material pair
The occupancy of land resource, the waste of economic resources and the pollution problem of environment, while aerating coagulation is reduced again
The production cost of earth building blocks alleviates the situation of flyash deficiency, this also complies with building energy conservation, sustainable development
Exhibition and environmentally protective requirement.But there are freeze proof cracking resistance deficiencies.
Invention content
The purpose of the present invention is for existing problem, provide a kind of silicon oil modified quick lime-calcium carbonate crystal whisker of addition
The preparation method of the autoclave aerated concrete building block of modified blast-furnace cinder.
The present invention is achieved by the following technical solutions：
A kind of preparation side of the autoclave aerated concrete building block of the silicon oil modified quick lime of addition-calcium carbonate crystal whisker modification blast-furnace cinder
Method includes the following steps：
（1）8-10 parts of cement, 2-3 parts of gypsum and 67-72 parts of granite stone powders are mixed, are connected in the stirring pool of steam at one
It is uniform to carry out dry mixing, is directly sent into blender from feed inlet, 60-62 DEG C of hot water is added and starts to stir, adds silicon oil modified life
Lime, calcium carbonate crystal whisker are modified blast-furnace cinder, then are adequately stirred；
（2）60-62 DEG C of hot water is added into 0.07-0.09 parts of foaming agent aluminium powders, 0.08-0.1 parts of air entraining agents, is dispersed with stirring
It is even, it is poured into blender, quickly stirring 30-40s is uniform, and gained slurry is injected mold, is put into 40-60 DEG C of incubator
Carry out it is quiet stop after conserving 2-3h, take out demoulding, cutting is blocking, and the green body of taking-up, which is sent into still kettle, carries out supporting for high temperature and pressure
Shield；
（3）First heat up 1-2h, make reaction kettle reach temperature be 180-185 DEG C, pressure 1.4-1.5MPa, then constant temperature 5-6h, most
1-2h is down to room temperature afterwards, goes out kettle, obtains autoclave aerated concrete building block.
Further, step（1）Described in the preparation method of silicon oil modified quick lime be：15-21 parts of caustic lime blocks are existed
Carry out grinding in flour mill, when grinding adds 0.02-0.04 part silicone oil, sieves.
Further, step（1）It is as follows that middle calcium carbonate crystal whisker is modified preparing for blast-furnace cinder：
13-16 parts of blast-furnace cinders, 2-3 parts of modifying agent calcium carbonate crystal whiskers are added in glue sand agitator, stirring at low speed 1-2min
Afterwards, 4-6 parts of alkali-activator sodium hydroxides, 1-2 parts of foaming agent hydrogen peroxides are added, tap water, stirring are added by water-solid ratio 0.5mL/g
Calcium carbonate crystal whisker is obtained after 2-3min is modified blast-furnace cinder.
Further, ratio of water to material is 0.5-0.6 in step (1), (2).
The present invention has the following advantages compared with prior art：
（1）Silicone oil is added when carrying out grinding to quick lime, can effectively extend oxidation rate, and do not reduce release heat, is suitble to
In production and application；The specific strength that autoclaved aerated block can be increased using the compound bleed of aluminium powder-air entraining agent, improves the gas of autoclaved aerated block
Pore structure, the aerated blocks good frost resistance of compound bleed.
（2）Using blast-furnace cinder as raw material, sodium hydroxide be alkali-activator, hydrogen peroxide is foaming agent, calcium carbonate crystal whisker is to change
Property agent, prepare calcium carbonate crystal whisker be modified blast-furnace cinder, the standard of thermal insulation material can be reached；Calcium carbonate crystal whisker is to heat preservation construction material heat conduction
The influence of performance is notable, and whisker makes the structure of material evenly, and cracking resistance and heat conductivility are more superior；Calcium carbonate crystal whisker adds
Though entering not change the chemical composition of material, it consolidates the bubble that foaming agent generates to increase the hole of material by connecting hole wall
Gap rate reduces bubble aperture, reduces the bulk density of material, the final thermal coefficient for reducing thermal insulation material.
Specific implementation mode
Embodiment 1
A kind of preparation side of the autoclave aerated concrete building block of the silicon oil modified quick lime of addition-calcium carbonate crystal whisker modification blast-furnace cinder
Method includes the following steps：
（1）8 parts of cement, 2 parts of gypsum and 67 parts of granite stone powders are mixed, is connected at one in the stirring pool of steam and carries out dry mixing
Uniformly, it directly is sent into blender from feed inlet, 60-62 DEG C of hot water is added and starts to stir, adds silicon oil modified quick lime, carbonic acid
Calcium pyroborate is modified blast-furnace cinder, then is adequately stirred；
（2）60-62 DEG C of hot water is added into 0.07 part of foaming agent aluminium powder, 0.08 part of air entraining agent, is dispersed with stirring uniformly, is fallen
Enter in blender, it is uniform quickly to stir 30s, and gained slurry is injected mold, is put into 40-60 DEG C of incubator and carries out quiet stopping conserving
After 2h, demoulding is taken out, cutting is blocking, and the green body of taking-up is sent into the maintenance that still kettle carries out high temperature and pressure；
（3）First heat up 1h, make reaction kettle reach temperature be 180-185 DEG C, pressure 1.5MPa, then constant temperature 5h, last 1h be down to
Room temperature goes out kettle, obtains autoclave aerated concrete building block.
Further, step（1）Described in the preparation method of silicon oil modified quick lime be：By 15 parts of caustic lime blocks in grinding
Carry out grinding in machine, when grinding adds 0.02 part of silicone oil, screening.
Further, step（1）It is as follows that middle calcium carbonate crystal whisker is modified preparing for blast-furnace cinder：
13 parts of blast-furnace cinders, 2 parts of modifying agent calcium carbonate crystal whiskers are added in glue sand agitator, after stirring at low speed 1min, addition 4
Part alkali-activator sodium hydroxide, 1 part of foaming agent hydrogen peroxide, add tap water by water-solid ratio 0.5mL/g, carbon are obtained after stirring 2min
Sour calcium pyroborate is modified blast-furnace cinder.
Further, ratio of water to material is 0.5 in step (1), (2).
Embodiment 2
A kind of preparation side of the autoclave aerated concrete building block of the silicon oil modified quick lime of addition-calcium carbonate crystal whisker modification blast-furnace cinder
Method includes the following steps：
（1）10 parts of cement, 3 parts of gypsum and 72 parts of granite stone powders are mixed, connects in the stirring pool of steam and is done at one
It mixes uniformly, is directly sent into blender from feed inlet, 60-62 DEG C of hot water is added and starts to stir, adds silicon oil modified quick lime, carbon
Sour calcium pyroborate is modified blast-furnace cinder, then is adequately stirred；
（2）60-62 DEG C of hot water is added into 0.07 part of foaming agent aluminium powder, 0.1 part of air entraining agent, is dispersed with stirring uniformly, is fallen
Enter in blender, it is uniform quickly to stir 40s, and gained slurry is injected mold, is put into 40-60 DEG C of incubator and carries out quiet stopping conserving
After 3h, demoulding is taken out, cutting is blocking, and the green body of taking-up is sent into the maintenance that still kettle carries out high temperature and pressure；
（3）First heat up 1h, make reaction kettle reach temperature be 180-185 DEG C, pressure 1.4MPa, then constant temperature 6h, last 1h be down to
Room temperature goes out kettle, obtains autoclave aerated concrete building block.
Further, step（1）Described in the preparation method of silicon oil modified quick lime be：By 15 parts of caustic lime blocks in grinding
Carry out grinding in machine, when grinding adds 0.02 part of silicone oil, screening.
Further, step（1）It is as follows that middle calcium carbonate crystal whisker is modified preparing for blast-furnace cinder：
13 parts of blast-furnace cinders, 3 parts of modifying agent calcium carbonate crystal whiskers are added in glue sand agitator, after stirring at low speed 2min, addition 6
Part alkali-activator sodium hydroxide, 2 parts of foaming agent hydrogen peroxides, add tap water by water-solid ratio 0.5mL/g, carbon are obtained after stirring 3min
Sour calcium pyroborate is modified blast-furnace cinder.
Further, ratio of water to material is 0.6 in step (1), (2).
Comparative example 1
This comparative example 1 compared with Example 1, in step（1）Middle quick lime of the addition without silicon oil modified processing, in addition to this
Method and step all same.
Comparative example 2
This comparative example 2 compared with Example 2, in step（1）The blast-furnace cinder being modified without calcium carbonate crystal whisker is added, removes this
Outer method and step all same.
Control group
Application No. is：201711048349.2 disclosed a kind of autoclave aerated concrete building block and preparation method thereof.
Resistance to compression after dry volume density, compression strength, jelly in order to compare autoclave aerated concrete building block produced by the present invention
Intensity, drying shrinkage value and thermal coefficient, to above-described embodiment 1, embodiment 2, comparative example 1,2 method pair of comparative example
The corresponding autoclave aerated concrete building block of autoclave aerated concrete building block and control group obtained is answered to be carried out according to professional standard
Performance detection, specific correction data are as shown in table 1 below：
Table 1
The synthesis mechanics of autoclave aerated concrete building block made from the method for the present invention it can be seen from upper table 1 is obtained using quality
Apparent improvement is promoted, and autoclave aerated concrete building block has very strong heat preservation and insulation, light, resistance to compression, anticracking, can keep
Good mechanics uses quality, and stability is strong, safe to use, and service life is long, and great popularizing value and market are competing
Strive power.Finished product can be sawed, can cut, can follow closely, can be engraved, and not only can be widely applied to civil buildings, industrial building, but also be more applicable for
Skyscraper.Product has energy saving, section soil, profit useless, considerable social benefit and environmental benefit.
Claims (4)
1. a kind of silicon oil modified quick lime of addition-calcium carbonate crystal whisker is modified the preparation of the autoclave aerated concrete building block of blast-furnace cinder
Method, which is characterized in that include the following steps：
（1）8-10 parts of cement, 2-3 parts of gypsum and 67-72 parts of granite stone powders are mixed, are connected in the stirring pool of steam at one
It is uniform to carry out dry mixing, is directly sent into blender from feed inlet, 60-62 DEG C of hot water is added and starts to stir, adds silicon oil modified life
Lime, calcium carbonate crystal whisker are modified blast-furnace cinder, then are adequately stirred；
（2）60-62 DEG C of hot water is added into 0.07-0.09 parts of foaming agent aluminium powders, 0.08-0.1 parts of air entraining agents, is dispersed with stirring
It is even, it is poured into blender, quickly stirring 30-40s is uniform, and gained slurry is injected mold, is put into 40-60 DEG C of incubator
Carry out it is quiet stop after conserving 2-3h, take out demoulding, cutting is blocking, and the green body of taking-up, which is sent into still kettle, carries out supporting for high temperature and pressure
Shield；
（3）First heat up 1-2h, make reaction kettle reach temperature be 180-185 DEG C, pressure 1.4-1.5MPa, then constant temperature 5-6h, most
1-2h is down to room temperature afterwards, goes out kettle, obtains autoclave aerated concrete building block.
2. a kind of silicon oil modified quick lime of addition-calcium carbonate crystal whisker according to claim 1 is modified the steam pressure of blast-furnace cinder
The preparation method of air-entrained concrete building block, which is characterized in that step（1）Described in the preparation method of silicon oil modified quick lime be：
15-21 parts of caustic lime blocks are subjected to grinding in flour mill, when grinding adds 0.02-0.04 part silicone oil, sieves.
3. a kind of silicon oil modified quick lime of addition-calcium carbonate crystal whisker according to claim 1 is modified the steam pressure of blast-furnace cinder
The preparation method of air-entrained concrete building block, which is characterized in that step（1）Middle calcium carbonate crystal whisker is modified the preparation of blast-furnace cinder such as
Under：
13-16 parts of blast-furnace cinders, 2-3 parts of modifying agent calcium carbonate crystal whiskers are added in glue sand agitator, stirring at low speed 1-2min
Afterwards, 4-6 parts of alkali-activator sodium hydroxides, 1-2 parts of foaming agent hydrogen peroxides are added, tap water, stirring are added by water-solid ratio 0.5mL/g
Calcium carbonate crystal whisker is obtained after 2-3min is modified blast-furnace cinder.
4. a kind of silicon oil modified quick lime of addition-calcium carbonate crystal whisker according to claim 1 is modified the steam pressure of blast-furnace cinder
The preparation method of air-entrained concrete building block, which is characterized in that ratio of water to material is 0.5-0.6 in step (1), (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810538531.4A CN108774073A (en) | 2018-05-30 | 2018-05-30 | A kind of preparation method of the autoclave aerated concrete building block of the silicon oil modified quick lime of addition-calcium carbonate crystal whisker modification blast-furnace cinder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810538531.4A CN108774073A (en) | 2018-05-30 | 2018-05-30 | A kind of preparation method of the autoclave aerated concrete building block of the silicon oil modified quick lime of addition-calcium carbonate crystal whisker modification blast-furnace cinder |
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| Publication Number | Publication Date |
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| CN108774073A true CN108774073A (en) | 2018-11-09 |
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| CN201810538531.4A Withdrawn CN108774073A (en) | 2018-05-30 | 2018-05-30 | A kind of preparation method of the autoclave aerated concrete building block of the silicon oil modified quick lime of addition-calcium carbonate crystal whisker modification blast-furnace cinder |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114276112A (en) * | 2022-01-24 | 2022-04-05 | 江苏宇山红建材科技有限公司 | Preparation method of autoclaved aerated concrete block |
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|---|---|---|---|---|
| EP2514731A1 (en) * | 2011-04-20 | 2012-10-24 | Knauf Insulation | Wood wool lightweight construction element |
| CN103288414A (en) * | 2013-05-14 | 2013-09-11 | 安徽筑园景新型建材科技有限公司 | Rice hull autoclaved concrete aerated light block and production method thereof |
| CN103739250A (en) * | 2013-12-31 | 2014-04-23 | 浙江索纳塔建筑材料有限公司 | Preparation method of impervious aerated building blocks |
| CN106542844A (en) * | 2016-10-27 | 2017-03-29 | 济南大学 | A kind of granite stone powder base autoclave aerated concrete building block and preparation method thereof |
-
2018
- 2018-05-30 CN CN201810538531.4A patent/CN108774073A/en not_active Withdrawn
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2514731A1 (en) * | 2011-04-20 | 2012-10-24 | Knauf Insulation | Wood wool lightweight construction element |
| CN103288414A (en) * | 2013-05-14 | 2013-09-11 | 安徽筑园景新型建材科技有限公司 | Rice hull autoclaved concrete aerated light block and production method thereof |
| CN103739250A (en) * | 2013-12-31 | 2014-04-23 | 浙江索纳塔建筑材料有限公司 | Preparation method of impervious aerated building blocks |
| CN106542844A (en) * | 2016-10-27 | 2017-03-29 | 济南大学 | A kind of granite stone powder base autoclave aerated concrete building block and preparation method thereof |
Non-Patent Citations (1)
| Title |
|---|
| 邢军等: "碳酸钙晶须对碱激发高炉矿渣保温材料性能的影响", 《金属矿山》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114276112A (en) * | 2022-01-24 | 2022-04-05 | 江苏宇山红建材科技有限公司 | Preparation method of autoclaved aerated concrete block |
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Application publication date: 20181109 |