CN101818531A - Cast-in-situ straw/ash magnesium oxychloride cement wall and construction method - Google Patents
Cast-in-situ straw/ash magnesium oxychloride cement wall and construction method Download PDFInfo
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- CN101818531A CN101818531A CN201010171497A CN201010171497A CN101818531A CN 101818531 A CN101818531 A CN 101818531A CN 201010171497 A CN201010171497 A CN 201010171497A CN 201010171497 A CN201010171497 A CN 201010171497A CN 101818531 A CN101818531 A CN 101818531A
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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
- C04B28/30—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 magnesium cements or similar cements
- C04B28/32—Magnesium oxychloride cements, e.g. Sorel cement
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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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/20—Resistance against chemical, physical or biological attack
- C04B2111/28—Fire resistance, i.e. materials resistant to accidental fires or high temperatures
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- 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
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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 invention discloses a cast-in-situ straw/ash magnesium oxychloride cement wall and a construction method. The straw/ash magnesium oxychloride cement wall is obtained by processing straw, ash, light burned magnesia, magnesium chloride and the like and performing in-situ casting under the action of a modifier. The straw/ash magnesium oxychloride cement wall comprises the following raw materials in percentage by mass: 45 and 60 percent of magnesium oxide, 25 to 40 percent of solution of magnesium chloride, 2 to 20 percent of straw, 5 to 15 percent of ash and 0.5 to 2 percent of modifier. When the wall is cast in situ, the magnesium oxide, the solution of magnesium chloride, the straw, the ash and the modifier are mixed and stirred, and water is added into the mixture according to the water absorption of the straw to perform one-time forming through in-situ casting after the mixture is stirred uniformly. The wall is characterized in that the doping volume of the straw can be changed according to design requirements, and the straw can be used as inner and outer partition plates; the binding power is strong, so the adhesion process of the cast-in-situ wall materials and the conventional wall materials is avoided; due to the addition of the straw, the volume weight of products is reduced and the heat-insulating and heat-shielding performance of the products is improved; and a large amount of waste material ash, straw and the like is utilized to relieve the environmental burden effectively and reduce the cost, so the wall has great economic and social benefits.
Description
One, technical field
The present invention relates to a kind of New Building Materials, relating generally to a kind of is raw material with agricultural crop straw, lime-ash, magnesia and halogen sheet etc., a kind of cast-in-place stalk magnesium oxychloride cement wall material and the job practices prepared.
Two, background technology
Development along with construction industry, the demand of constructional materials is increasing, and traditional construction material exists serious drawback all the time on producing for many years, picture is based on traditional materials for wall of vitrified bond, not only raw material consume soil and mineral resources in a large number, and cause the destruction of the wasting of resources and natural environment.Consider that from the angle of sustainable development following building materials industry must break through high this drawback of energy consumption.For this reason as far back as 20th century 40, the fifties developed country just begun the transformation of materials for wall structure, various light type composite panels obtain broad development, and use in modern architecture.The lightweight building wall material development of China is started late, and phase late 1980s, the novel light composite plate has had development to a certain degree.At present, the most of building of China adds the water stirring and makes concrete and carrying out in-situ concrete wall after its materials for wall mainly mixes by a certain percentage with cement, sand, stone etc., and its cost is at 70 yuan/square metre.In addition, the materials for wall of Cun Zaiing also comprises on the market: finished glass fiber reinforced gypsum board material, price can reach 45 yuan/m
2, the lowest price of warming plate is 33-38 unit/m in the market
2, the price of partition board is generally at 38-60 unit/m
2
In addition, China's stalk output has 200,000,000 tons of stalks every year by open incineration approximately up to reaching 700,000,000 tons approximately every year, and stalk open incineration phenomenon grows in intensity, and brings a series of problems for ecological environment, traffic administration etc.China's industrial solid castoff is stored up in a large number, and coal-fired thermal power factory lime-ash discharge value reaches more than 300,000,000 tons every year, and accumulative total stacking amount is about 4,000,000,000 tons, take up an area of ten thousand hectares of 4-5, and comprehensive utilization ratio has caused severe contamination less than 40% to environment.China's magnesite magnesia reserves rank first in the world, and magnesia alternative materials dolomite is widely distributed in China, and reserves are abundant, and material matrix belongs to low alkalinity, adopts enhancings such as straw, reduces cost greatly and cost.The halogen sheet then is the byproduct of saltworks, and only the reserves in salt lake, Qinghai just reach 19 * 10
8Ton.
Three, summary of the invention
In order to solve problems such as existing magnesium cement product poor water resistance, the invention provides a kind of cast-in-place straw/ash magnesium-oxy-chloride cement body of wall and job practices, the cast-in-place cement wall water-tolerant that obtains, cost is low, intensity is high.
Technical scheme of the present invention is: a kind of job practices of cast-in-place straw/ash magnesium-oxy-chloride cement body of wall, and step is:
The first step is mixed with the MgCl that mass concentration is 25%-30% with the halogen sheet
2The aqueous solution;
Second step, by percentage to the quality: MgO 45-60%, MgCl
2Solution 25-40%, stalk 2-20%, lime-ash 5-15%, the ratio of modifier 0.5-2% adds MgCl with modifier earlier
2Stir in the solution, and then mix stirring, obtain the magnesia oxychloride cement cementitious material with MgO powder that stirs and lime-ash; Then, stalk fibre is added in the magnesia oxychloride cement cementitious material, add water according to the stalk water absorption rate and stir when measuring the mixture degree of mobilization according to GB/T 2419-2005 Test method for fluidity of cement mortar and reach 110-140mm cast-in-site body of wall, one-shot forming.
Described stalk fibre adopts straw, wheat straw, cornstalk or cotton stalk to process, and length is 5mm-20mm, and diameter is 0.2mm-0.5mm.
Used modifier is any one in phosphate, boric acid or the Boratex.
Used phosphate comprises any one in potassium dihydrogen phosphate, ammonium dihydrogen phosphate (ADP), sodium dihydrogen phosphate, the magnesium phosphate.
Lime-ash is any one or the arbitrarily several mixing in flyash, slag or the silicon ash.
Used MgO is light-burned MgO, active quantities 〉=80%.
The body of wall that obtains, the composition of raw materials of body of wall be by percentage to the quality: MgO45-60%, MgCl
2Solution 25-40%, stalk 2-20%, lime-ash 5-15%, modifier 0.5-2%, wherein MgCl
2Solution is the aqueous solution of 25%-30% for the mass fraction that the preparation of halogen sheet obtains.
The present invention has following beneficial effect:
1. the intensity of body of wall is different with the volume of stalk, and 56d intensity is about 1MPa-60MPa, and according to designing requirement, the stalk volume can change, and not only can be used as load bearing wall but also can be used as non;
2. have alkalescent and low-corrosiveness.Magnesia oxychloride cement slurry pH value of filtrate is between 8.5-9.5, and is more much lower than the basicity of portland cement, and general only have corrosiveness to metal;
3. caking property is good, with some organic or inorganic aggregates such as wood sawdust, wood powder, mineral dust and sandstone etc. very strong adhesion stress is arranged, thereby has removed the adhesion technology of cast-in-situ wall and existing materials for wall from;
4. anti-flammability is good.MgO, MgCl
2All be non-flammable, and mass crystallization water can both stop and light in the goods hydrate;
5. stalk is processed into fiber and is used for magnesia oxychloride cement lime-ash cementitious material, reduced the apparent density and the unit weight of goods, improved the thermal and insulating performance of goods;
6. utilize a large amount of waste material lime-ash and stalk etc., effectively alleviate environmental pressure, and reduce cost; Utilize the huge magnesite of Chinese reserves to obtain light calcined magnesia, raw material is easy to gather.
7. cast-in-place stalk ash magnesium oxychloride cement wall material of the present invention, when stalk volume volume was 40%, cost price was 17 yuan/square metre and formerly is lower than the market flat fare that its market competitiveness is apparent.
Four, the specific embodiment
A kind of job practices of cast-in-place stalk ash magnesium oxychloride cement wall material, step is as follows:
(1) be the magnesium chloride solution of 25%-30% with halogen sheet compound concentration;
(2) choose any one or arbitrarily several mixing in lime-ash such as flyash, slag, the silicon ash, with modifier, modifier is any one in phosphate, boric acid or the Boratex.Phosphate is any one in potassium dihydrogen phosphate, ammonium dihydrogen phosphate (ADP), sodium dihydrogen phosphate, the magnesium phosphate.
(3) choosing length is 5mm-20mm, and diameter is the stalk fibre that straw, wheat straw, cornstalk or the cotton stalk of 0.2mm-0.5mm processes;
(4) form according to various raw material quality percentages: magnesia 45%-60%, magnesium chloride solution 25%-40%, stalk 2%-20%, lime-ash 5%-15%, modifier 0.5%-2% adds suitable quantity of water, mixing and stirring according to the stalk water absorption rate, when cementitious material presents good mobility and just measures the mixture degree of mobilization and reach 110-140mm according to GB/T 2419-2005 Test method for fluidity of cement mortar, cast-in-situ wall.Used MgO is light-burned MgO, and active quantities 〉=80% can utilize the huge magnesite calcining of Chinese reserves to obtain.
Below raw materials used percentage be all mass percent.
Embodiment 1: choose raw material according to above-mentioned characterization step, light-burned MgO volume is 55.8%, and mass percent concentration is 25% MgCl
2The solution volume is 35.23%, and lime-ash (flyash) volume is 5.58%, and the stalk volume is 2.83%, and modifier potassium dihydrogen phosphate volume is 0.56%.Carry out preparation, the preparation of stalk ash magnesia oxychloride cement cementitious material according to above-mentioned characterization step, add water according to the stalk water absorption rate and stir (controlling mobile 110-140mm), cast-in-situ wall, disposal molding.
The body of wall dry density is 1780kg/m
3, the 56d rupture strength reaches 10-16MPa, and 56d compressive strength reaches 40-60MPa, and coefficient of thermal conductivity is 0.3w/ (mk).
Embodiment 2: choose raw material according to above-mentioned characterization step, the MgO volume is 54.88%, MgCl
2The solution volume is 32.96%, and lime-ash (slag) volume is 5.48%, and the stalk volume is 6.14%, and modifier ammonium dihydrogen phosphate (ADP) volume is 0.54%.Carry out preparation, the preparation of stalk ash magnesia oxychloride cement cementitious material according to above-mentioned characterization step, add water according to the stalk water absorption rate and stir (control is mobile), cast-in-situ wall, disposal molding.
The body of wall dry density is 1680kg/m
3, the 56d rupture strength reaches 8-11MPa, and 56d compressive strength reaches 20-35MPa, and coefficient of thermal conductivity is 0.28w/ (mk).
Embodiment 3: choose raw material according to above-mentioned characterization step, the MgO volume is 52.57%, the MgCl of 30%wt
2The solution volume is 31.57%, and lime-ash (silicon ash) volume is 5.26%, and the stalk volume is 10.08%, and modifier sodium dihydrogen phosphate volume is 0.52%.Carry out preparation, the preparation of stalk ash magnesia oxychloride cement cementitious material according to above-mentioned characterization step, add water according to the stalk water absorption rate and stir (control is mobile), cast-in-situ wall, disposal molding.
The body of wall dry density is 1300kg/m
3, the 56d rupture strength reaches 7-10MPa, and 56d compressive strength reaches 13-20MPa, and coefficient of thermal conductivity is 0.21w/ (mk).
Embodiment 4: choose raw material according to above-mentioned characterization step, the MgO volume is 47.61%, the MgCl of 28%wt
2The solution volume is 31.89%, and lime-ash (mixture of flyash, slag) volume is 5% (cannot less than the scope of claims), and the stalk volume is 15%, and modifier magnesium phosphate volume is 0.5%.Carry out preparation, the preparation of stalk ash magnesia oxychloride cement cementitious material according to above-mentioned characterization step, add water according to the stalk water absorption rate and stir (control is mobile), cast-in-situ wall, disposal molding.
The body of wall dry density is 830kg/m
3, the 56d rupture strength reaches 3-7MPa, and 56d compressive strength reaches 6-9MPa, and coefficient of thermal conductivity is 0.15w/ (mk).
Embodiment 5: choose raw material according to above-mentioned characterization step, the MgO volume is 45%, MgCl
2The solution volume is 28%, and lime-ash (mixture of flyash, slag, silicon ash) volume is 5%, and the stalk volume is 20%, and modifier boric acid volume is 2%.Carry out preparation, the preparation of stalk ash magnesia oxychloride cement cementitious material according to above-mentioned characterization step, add water according to the stalk water absorption rate and stir (control is mobile), cast-in-situ wall, disposal molding.
The body of wall dry density is 540kg/m
3, the 56d rupture strength reaches 0.2-2MPa, and 56d compressive strength reaches 1-2MPa, and coefficient of thermal conductivity is 0.11w/ (mk).
Embodiment 6: choose raw material according to above-mentioned characterization step, the MgO volume is 60%, the MgCl of 26%wt
2The solution volume is 25%, and lime-ash (mixture of silicon ash, slag) volume is 10.5%, and the stalk volume is 4%, and modifier Boratex volume is 0.5%.Carry out preparation, the preparation of stalk ash magnesia oxychloride cement cementitious material according to above-mentioned characterization step, add water according to the stalk water absorption rate and stir (control is mobile), cast-in-situ wall, disposal molding.
Embodiment 7: choose raw material according to above-mentioned characterization step, the MgO volume is 45%, the MgCl of 25%wt
2The solution volume is 40%, and lime-ash (silicon ash) volume is 6%, and the stalk volume is 8.5%, and modifier sodium dihydrogen phosphate volume is 0.5%.Carry out preparation, the preparation of stalk ash magnesia oxychloride cement cementitious material according to above-mentioned characterization step, add water according to the stalk water absorption rate and stir (control is mobile), cast-in-situ wall, disposal molding.
Embodiment 8: choose raw material according to above-mentioned characterization step, the MgO volume is 45%, the MgCl of 30%wt
2The solution volume is 25%, and lime-ash (silicon ash) volume is 15%, and the stalk volume is 14.5%, and modifier sodium dihydrogen phosphate volume is 0.5%.Carry out preparation, the preparation of stalk ash magnesia oxychloride cement cementitious material according to above-mentioned characterization step, add water according to the stalk water absorption rate and stir (control is mobile), cast-in-situ wall, disposal molding.
Embodiment 9: choose raw material according to above-mentioned characterization step, the MgO volume is 45%, the MgCl of 30%wt
2The solution volume is 25%, and lime-ash (silicon ash) volume is 9.5%, and the stalk volume is 20%, and modifier sodium dihydrogen phosphate volume is 0.5%.Carry out preparation, the preparation of stalk ash magnesia oxychloride cement cementitious material according to above-mentioned characterization step, add water according to the stalk water absorption rate and stir (control is mobile), cast-in-situ wall, disposal molding.
Intensity reduces with the increase of stalk volume as can be seen from the above embodiments.
Claims (7)
1. the job practices of a cast-in-place straw/ash magnesium-oxy-chloride cement body of wall is characterized in that, step is:
The first step is mixed with the MgCl that mass concentration is 25%-30% with the halogen sheet
2The aqueous solution;
Second step, by percentage to the quality: MgO 45-60%, MgCl
2Solution 25-40%, stalk 2-20%, lime-ash 5-15%, the ratio of modifier 0.5-2% adds MgCl with modifier earlier
2Stir in the solution, and then mix stirring, obtain the magnesia oxychloride cement cementitious material with MgO powder that stirs and lime-ash; Then, stalk fibre is added in the magnesia oxychloride cement cementitious material, add water according to the stalk water absorption rate and stir when the mixture flowability reaches 110-140mm cast-in-site body of wall, one-shot forming.
2. the job practices of cast-in-place straw/ash magnesium-oxy-chloride cement body of wall as claimed in claim 1 is characterized in that, described stalk fibre adopts straw, wheat straw, cornstalk or cotton stalk to process, and length is 5mm-20mm, and diameter is 0.2mm-0.5mm.
3. the job practices of cast-in-place straw/ash magnesium-oxy-chloride cement body of wall as claimed in claim 1 is characterized in that, described modifier is any one in phosphate, boric acid or the Boratex.
4. the job practices of cast-in-place straw/ash magnesium-oxy-chloride cement body of wall as claimed in claim 3 is characterized in that, described phosphate is any one in potassium dihydrogen phosphate, ammonium dihydrogen phosphate (ADP), sodium dihydrogen phosphate, the magnesium phosphate.
5. the job practices of cast-in-place straw/ash magnesium-oxy-chloride cement body of wall as claimed in claim 1 is characterized in that, lime-ash is any one or the arbitrarily several mixing in flyash, slag or the silicon ash.
6. the job practices of cast-in-place straw/ash magnesium-oxy-chloride cement body of wall as claimed in claim 1 is characterized in that, described MgO is light-burned MgO, active quantities 〉=80%.
7. the body of wall that obtains according to the job practices of the described cast-in-place straw/ash magnesium-oxy-chloride cement body of wall of claim 1 is characterized in that, the composition of raw materials of body of wall by percentage to the quality: MgO 45-60%, MgCl
2Solution 25-40%, stalk 2-20%, lime-ash 5-15%, modifier 0.5-2%, wherein MgCl
2Solution is the aqueous solution of 25%-30% for the mass fraction that the preparation of halogen sheet obtains.
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|---|---|---|---|---|
| CN102010175A (en) * | 2010-11-12 | 2011-04-13 | 中国科学院青海盐湖研究院 | Baking-free and steaming-free brick and building block and preparation method thereof |
| CN102060454A (en) * | 2010-11-22 | 2011-05-18 | 内蒙古祥响新型建材开发有限责任公司 | Light-burned dolomite cement |
| CN102060490A (en) * | 2010-11-22 | 2011-05-18 | 中国科学院青海盐湖研究所 | Unburned and non-autoclaved caustic calcined dolomite brick and building block |
| CN102070353A (en) * | 2010-11-22 | 2011-05-25 | 中国科学院青海盐湖研究所 | Light-burned dolomite foam light partition board |
| CN102079650A (en) * | 2010-11-22 | 2011-06-01 | 中国科学院青海盐湖研究所 | Light-burned dolomite light-weight wall partition board |
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| CN102285785A (en) * | 2011-06-14 | 2011-12-21 | 东南大学 | Modified magnesium oxychloride cement product and preparation method thereof |
| CN102795803A (en) * | 2012-06-28 | 2012-11-28 | 盐城工学院 | Composite modifier used in magnesium-chlorine cement and application thereof |
| CN103406976A (en) * | 2013-05-28 | 2013-11-27 | 常熟市金亿复合材料有限公司 | Method for manufacturing fiber cement board |
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| CN104446320A (en) * | 2014-11-27 | 2015-03-25 | 中国科学院青海盐湖研究所 | Magnesium oxychloride cement coating for exterior walls and preparation method of coating |
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| CN105110758A (en) * | 2015-10-09 | 2015-12-02 | 沈阳建筑大学 | Method for preparing building thermal insulation material through composition of maize straw and magnesium oxychloride cement |
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| CN105331294A (en) * | 2015-09-30 | 2016-02-17 | 信阳市四通机械制造有限公司 | Flame retardant environmentally friendly adhesive and producing method of plant fiberboard |
| CN107721219A (en) * | 2017-11-02 | 2018-02-23 | 中国科学院青海盐湖研究所 | A kind of high waterproof magnesium cement and preparation method thereof |
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| CN102060454A (en) * | 2010-11-22 | 2011-05-18 | 内蒙古祥响新型建材开发有限责任公司 | Light-burned dolomite cement |
| CN102060490A (en) * | 2010-11-22 | 2011-05-18 | 中国科学院青海盐湖研究所 | Unburned and non-autoclaved caustic calcined dolomite brick and building block |
| CN102070353A (en) * | 2010-11-22 | 2011-05-25 | 中国科学院青海盐湖研究所 | Light-burned dolomite foam light partition board |
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| CN102140029A (en) * | 2011-05-13 | 2011-08-03 | 乐山一拉得电网自动化有限公司 | Novel wall material |
| CN102140029B (en) * | 2011-05-13 | 2012-11-28 | 乐山一拉得电网自动化有限公司 | Novel wall material |
| CN102285785B (en) * | 2011-06-14 | 2013-02-27 | 东南大学 | Modified magnesium oxychloride cement product and preparation method thereof |
| CN102285785A (en) * | 2011-06-14 | 2011-12-21 | 东南大学 | Modified magnesium oxychloride cement product and preparation method thereof |
| CN102795803B (en) * | 2012-06-28 | 2014-09-17 | 盐城工学院 | Composite modifier used in magnesium-chlorine cement and application thereof |
| CN102795803A (en) * | 2012-06-28 | 2012-11-28 | 盐城工学院 | Composite modifier used in magnesium-chlorine cement and application thereof |
| CN103406976A (en) * | 2013-05-28 | 2013-11-27 | 常熟市金亿复合材料有限公司 | Method for manufacturing fiber cement board |
| CN103613358A (en) * | 2013-11-15 | 2014-03-05 | 眭良 | Magnesite plant straw ash heat-preserving product and realizing method |
| CN104760120A (en) * | 2014-01-07 | 2015-07-08 | 宽甸满族自治县志华化工有限公司 | Novel light fireproof wall board and manufacturing method thereof |
| CN104446320B (en) * | 2014-11-27 | 2016-08-24 | 中国科学院青海盐湖研究所 | A kind of exterior coating of magnesia oxychloride cement and preparation method thereof |
| CN104446320A (en) * | 2014-11-27 | 2015-03-25 | 中国科学院青海盐湖研究所 | Magnesium oxychloride cement coating for exterior walls and preparation method of coating |
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| CN105110758B (en) * | 2015-10-09 | 2017-08-25 | 沈阳建筑大学 | The compound method for preparing building thermal insulation material of a kind of utilization maize straw and magnesia oxychloride cement |
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| CN107721219A (en) * | 2017-11-02 | 2018-02-23 | 中国科学院青海盐湖研究所 | A kind of high waterproof magnesium cement and preparation method thereof |
| CN113024181A (en) * | 2020-09-23 | 2021-06-25 | 西安建筑科技大学 | High-tenacity high-cohesiveness C100-strength high-strength fiber concrete and preparation method thereof |
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