CN101549987A - Fly ash-desulfuration gypsum composite active mineral admixture for concrete and method and application of the same - Google Patents
Fly ash-desulfuration gypsum composite active mineral admixture for concrete and method and application of the same Download PDFInfo
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- CN101549987A CN101549987A CNA2009100429726A CN200910042972A CN101549987A CN 101549987 A CN101549987 A CN 101549987A CN A2009100429726 A CNA2009100429726 A CN A2009100429726A CN 200910042972 A CN200910042972 A CN 200910042972A CN 101549987 A CN101549987 A CN 101549987A
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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
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
- C04B40/0039—Premixtures of ingredients
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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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Abstract
The present invention relate to a fly ash-desulfuration gypsum composite active mineral admixture for concrete and method and application of the same, belonging to construction material and environment friendly technic field. The fly ash-desulfuration gypsum composite active mineral admixture is principally mixed by components of fly ash, desulfuration gypsum and composite activity excitated component, and each of the component in total mass of the admixture is in ratio of: fly ash 45-70%; desulfuration gypsum 15-40%; composite activity excitated component 5-10%. The fly ash-desulfuration gypsum composite activity mineral admixture of the mass of the gelled materials of concrete is in ratio of 20-50%. The invention if the concrete is provided with function of reducing heat of hydration, dense filling, increasing early strength and durability, simultaneity making good use of industry scrap fly ash and desulfuration gypsum of coal-fired power plant, possessing excellent capability of energy-saving and environment friendly, large social meanings and considerable technic economic benefits.
Description
Technical field
The invention belongs to building material technology and environmental technology field, relate to a kind of concrete fly ash-desulfuration gypsum composite active mineral admixture and preparation and application.
Background technology
Along with the progress of society and engineering level, high-strength, high performance concrete has been widely used in important buildings such as Highrise buildings, bridge, highway and water conservancy project and the infrastructure construction, and demand is increasing.Active mineral admixture with its pozzolanic activity effect, the closely knit filling effect of micro-aggregate and particle form effect etc. to the significant modifying function of concrete, as improve concrete microstructure and strengthen interfacial transition zone, improve construction workability, intensity and weather resistance etc., become one of high-strength, that the high performance concrete compounding process is indispensable function ingredients, be described as concrete except that cement, water, sand, stone, admixture " the 6th component ".The research of high-strength, high performance concrete active mineral admixture and development and use have become a focus direction of current concrete research.
Flyash (Fly Ash is called for short FA) and desulfurized gesso of flue gas (Flue Gas Desulphurization Gypsum is called for short FGD) are two big industrial residues of coal-burning power plant.Flyash has had utilization to a certain degree as a kind of active mineral admixture with latent hydraulicity in the preparation of concrete especially high performance concrete, but because its limitation on hydration activity, cause defectives such as early age strength of concrete is low, in gelling material aquation system, serve as inert filler mostly, restrict its efficient application greatly.On the other hand, state compulsion requires power plant to the sulfur dioxide emissions desulfurized treatment, and its consequence is the desulfurated plaster that produces a large amount of associations.Estimated for the year ends 2010, the whole nation is produced desulfurated plaster per year and will be reached about 1,000 ten thousand t, becomes the another big solid waste of coal-burning power plant behind flyash., CaSO even for quality
4The higher desulfurated plaster of content often is used to produce adjusting congelation of cement component or building gypsum plaster, gypsum sheet material etc.But a reality can not ignoring is: most power plant soot inferior qualitys, coal-fired kind frequent variations and the defective on desulfurization technology, cause the inferior quality and the quality instability of desulfurated plaster.These desulfurated plasters relatively inferior can not get recycle preferably usually, stack land occupation in a large number, decompose and cause secondary pollution, and weather, soil, plant and human health are brought harm, and long-standing abuse already is for suffering from.
Flyash and desulfurated plaster (desulfurated plaster especially inferior) are combined common exploitation, make full use of the vitriol activity excitation effect of desulfurated plaster, a kind of very ideal solution of can yet be regarded as flyash.Existing a few studies person has carried out relevant research work both at home and abroad at present.People such as Hong Kong Poon C S utilize desulfurated plaster to carry out the activity excitation mechanism research of meal coal ash and the Study on curing of dangerous solid waste, have obtained certain achievement; People such as Turkey Ariozo utilize common compound production and the applied research of carrying out composition brick of materials such as flyash, desulfurated plaster and lime, and have inquired into each factor to the research of composition brick Effect on Performance; People such as domestic former great waves forever study at the mechanical property and the consolidation characteristics of fly ash-desulfuration gypsum agglutination material.Yet fly ash-desulfuration gypsum agglutination material intensity is low, uses restricted greatly; Be used for concrete composite active mineral admixture and it is developed as, except that performance flyash, desulfurated plaster self wood property advantage, also can obtain a series of gratifying interaction effects, have very wide application prospect.What be worth emphasizing is, desulfurated plaster mixes in the concrete with larger proportion, sharp useless effective, intake is big, is the effective way that low-quality desulfurated plaster is turned waste into wealth.By retrieval, do not see the comprehensive utilization technique report of fly ash-desulfuration gypsum in concrete; The design and the technology of preparing that with flyash and desulfurated plaster are the concrete composite active mineral admixture of base material are not seen disclosed relevant patent.
Summary of the invention
The object of the invention is to provide a kind of concrete with fly ash-desulfuration gypsum composite active mineral admixture and its production and application, and that its performance reaches fully is high-strength, high performance concrete is with the technical feature requirement of active mineral admixture.
The objective of the invention is to realize in the following manner.
A kind of concrete excites component to mix with fly ash-desulfuration gypsum composite active mineral admixture by flyash, desulfurated plaster, composite reactive; Flyash accounts for 45～70% of adulterant total mass, and desulfurated plaster accounts for 15～40% of adulterant total amount, and composite reactive excites 5～10% of ingredients constitute adulterant total mass; Described composite reactive excites component by unslaked lime and Na
2SO
4Form, the unslaked lime volume is 4～8% of an adulterant total mass, Na
2SO
4Volume is no more than 2% of adulterant total mass.
The preferred mass ratio of each ingredients constitute adulterant total mass of described adulterant is: flyash 50～60%, desulfurated plaster 20～30%, unslaked lime 4～8%, Na
2SO
41.5～2%.
Described desulfurated plaster is taken from the coal-fired plant flue gas desulfuration byproduct, comprises CaSO
42H
2O, CaSO
42H
2The O quality is not less than 80% of desulfurated plaster total mass, and attached water content is no more than 4% of desulfurated plaster total mass.
Described flyash is taken from and is not less than the fly ash grain that row II level is done by the coal-burning power plant, and the Blain specific surface of described flyash is not less than 300m
2/ kg.
CaO content is not less than 95% in the described unslaked lime.
The preparation method of described fly ash-desulfuration gypsum composite active mineral admixture is as follows:
1) in advance with the desulfurated plaster fragmentation, will account for then adulterant total mass 45%～70% flyash, account for adulterant total mass 15%～40% desulfurated plaster and mix and to mix thoroughly, and dry;
2) will account for the unslaked lime of adulterant total mass 4～8% and be no more than 2% Na of adulterant total mass again
2SO
4Mixing and stirring forms composite reactive and excites component;
4) will mix at last and dried desulfurated plaster and flyash again with activity excitation component mixing and stirring, described adulterant.
Desulfurated plaster in the described step 1) is crushed to granular size and is no more than 1.25mm, and described drying is under 50 ℃～90 ℃ conditions dry 1～2 hour, and perhaps natural air drying or airing are 6～8 days.
Described Na
2SO
4, commercial powder product, no crystal water.
Concrete fly ash-desulfuration gypsum composite active mineral admixture of the present invention, according to concrete technical feature being required and application project type different, the optimum mix amount scope of fly ash-desulfuration gypsum composite active mineral admixture in concrete is 20～50%.
The present invention combines the two kinds of industrial wastes in coal-burning power plant, exploitation is used for that concrete is especially high-strength, the high performance concrete active mineral admixture, make full use of flyash and desulfurated plaster self wood property advantage, be aided with the mutual excitation that adds activity excitation component and consequent composite gelled material system hydration process, concrete is had significant modified effect.Compare with traditional concrete mineral admixture, have following advantage:
1. in the concrete gel material system, along with mixing of fly ash-desulfuration gypsum composite blend, flyash plays the excellent closely knit filling effect of micro-aggregate, particle form water-reduction on the one hand, reduces hydration heat in concrete, optimize the concrete micro hole structure and strengthen interfacial transition zone; On the other hand, utilize desulfurated plaster air-setting and with the complex excitation effect of external excitation component to flyash, improve the early activity of flyash greatly, effectively overcome flyash and mix the problem that reduces early age strength of concrete.Mechanical property test proves, mixes the early age strength of concrete (7d) of fly ash-desulfuration gypsum composite blend and can catch up with even omit above the normal concrete intensity of not mixing adulterant; Compare the concrete of single fly ash simultaneously, early strength (7d) promotes 20～30%.
2. owing to flyash, answering of desulfurated plaster are mixed, the fineness that flyash is bigger reaches strong micro-aggregate buttressing effect itself, reinforcing concrete microstructure on the one hand; On the other hand, desulfurated plaster has the microdilatancy effect in hydration process, can compensate inherent volumetric shrinkage distortion in the cement hydration process to a certain extent.Test finds that the concrete that single fly ash is compared in each shrinkage strain in the length of time of the concrete of fly ash-desulfurated plaster composite blend has remarkable reduction, generally reaches 30～100 microstrains; And compare the concrete of not mixing adulterant, can reduce by 50～150 microstrains.
3. weather resistance such as the concrete permeability resistance of fly ash-desulfurated plaster composite blend, anti-sulphates corrosive, anti-soft water erosion significantly improve.
4. different with the engineering type of using according to the concrete technical feature requirement, the optimum mix amount scope of fly ash-desulfuration gypsum composite active mineral admixture in concrete is 20～50%, and volume is bigger.The annual concrete total amount of producing of China is very huge, thereby the quantity of receiving desulfurated plaster and flyash thus is also with considerable.Compare single fly ash or other mineral admixture kind, fly ash-desulfuration gypsum composite active mineral admixture possesses more remarkable society, environmental protection effect.
5. flyash and desulfurated plaster price are low, and desulfurated plaster power plant that some qualities are lower even free supply add the activity excitation component and also take from commercially available general chemistry product, and be with low cost.For concrete production enterprise and applying unit, it is bigger to compare other mineral admixture economic benefit; For the coal-burning power plant, the two utilization of industrial waste makes enterprise break away from white elephant, and brings new growth engines.
The present invention compares existing normal concrete mineral admixture (main component is II level flyash and slag) on result of use, the advantage that mainly shows is mainly reflected on the concrete performance, can conclude as shown in table 1.
Table 1 and the concrete partial properties contrast of mixing other mineral admixtures
Annotate: the concrete performance of preparing with the II level flyash of identical volume is a benchmark here
In sum, the present invention helps promoting the technical feature of conventional concrete material, helps the regeneration of secondary resource, and energy-conservation profit is useless, and the environmental protection attribute is outstanding, meets the strategic requirement that China is sustainable, develop in harmony.
Embodiment
For better understanding the present invention, further illustrate within the present invention in conjunction with engineering example and to hold, but the present invention not only is confined to the following stated embodiment.
Embodiment 1
Concrete with fly ash-desulfuration gypsum composite active mineral admixture according to following mass ratio chosen material:
1) power plant desulfurization gypsum: 30%;
2) row I level flyash is done by power plant: 60%, and Blain specific surface 420m
2/ kg;
3) activity excitation component: 10%, wherein commercially available unslaked lime: 8.0%, Na
2SO
4: 2.0%, mix;
4) desulfurated plaster is crushed to behind the 1.25mm and the flyash mixing and stirring, oven dry is 2 hours under 55 ℃ of conditions of loft drier;
5) dried desulfurated plaster and mixture of fly ash and composite reactive excite the component mixing and stirring, and preparation is the concrete composite active mineral admixture of base material with the fly ash-desulfuration gypsum.
Be formulated as example with the C50 high performance concrete, fly ash-desulfuration gypsum composite active mineral admixture equivalent of the present invention replaces cement and mixes concrete with 30%.The total consumption 400kg/m of concrete gel material
3, water-cement ratio 0.32 mixes the high efficiency water reducing agent pulvis, and volume is 1.0% of a binder total amount.
With the normal concrete contrast of not mixing adulterant, prepared C50 high performance concrete fundamental property sees Table 2 and table 3.
The concrete slump of table 2 and intensity
Table 3 concrete drying shrinkage in each in the length of time
By table 2～3 data as can be known, quality such as fly ash-desulfuration gypsum composite active mineral admixture replace cement 30%, successfully prepare the C50 concrete, and the fresh concrete slump obviously improves; 7d intensity and normal concrete are suitable, and 28d intensity satisfies code requirement, reaches 62.5MPa; Each, drying shrinkage deformation was all less than normal concrete in the length of time, and the 28d shrinking percentage is 280 microstrains only, compare normal concrete and have reduced by 95 microstrains.
Embodiment 2
The concrete fly ash-desulfuration gypsum composite active mineral admixture, according to following mass ratio chosen material:
1) power plant desulfurization gypsum: 40%;
2) row II level flyash is done by power plant: 52%, and Blain specific surface 320m
2/ kg;
3) activity excitation component: 6%, wherein commercially available unslaked lime 5.0%, Na
2SO
41.0%, mix;
4) after desulfurated plaster is crushed to 1.25mm, with the flyash mixing and stirring, under state of nature air-dry 7 days;
5) desulfurated plaster after air-dry and mixture of fly ash are excited the component mixing and stirring with composite reactive again, obtaining with the fly ash-desulfuration gypsum is the concrete composite active mineral admixture of base material.
Be formulated as example with the C30 concrete, fly ash-desulfuration gypsum composite active mineral admixture equivalent of the present invention replaces cement 30%, the total consumption 326kg/m of concrete gel material
3, water-cement ratio 0.36 mixes the high efficiency water reducing agent pulvis, and volume is 1.2% of a binder total amount.
Test shows that the concrete 28d intensity of fly ash-desulfuration gypsum composite active mineral admixture reaches 38.5MPa, and the 28d contract with dry rate is 310 microstrains, satisfies the actual requirement of engineering, and the fresh concrete good fluidity, slump 125mm.
Embodiment 3
The concrete fly ash-desulfuration gypsum composite active mineral admixture, according to following mass ratio chosen material:
1) power plant desulfurization gypsum: 25%;
2) row II level flyash is done by power plant: 67%, and Blain specific surface 320m
2/ kg;
3) activity excitation component: 8%, wherein commercially available unslaked lime 6.5%, Na
2SO
41.5%, mix;
4) after desulfurated plaster is crushed to 1.25mm, with the flyash mixing and stirring, under state of nature air-dry 7 days;
5) desulfurated plaster after air-dry and mixture of fly ash are excited the component mixing and stirring with composite reactive again, obtaining with the fly ash-desulfuration gypsum is the concrete composite active mineral admixture of base material.
Be formulated as example with the C30 concrete, fly ash-desulfuration gypsum composite active mineral admixture equivalent of the present invention replaces cement 25%, the total consumption 335kg/m of concrete gel material
3, water-cement ratio 0.36 mixes the high efficiency water reducing agent pulvis, and volume is 1.2% of a binder total amount.
Test shows that the concrete 28d intensity of fly ash-desulfuration gypsum composite active mineral admixture reaches 39.1MPa, and the 28d contract with dry rate is 325 microstrains, satisfies the actual requirement of engineering, and the fresh concrete good fluidity, slump 145mm.
Embodiment 4
The concrete fly ash-desulfuration gypsum composite active mineral admixture, according to following mass ratio chosen material:
1) power plant desulfurization gypsum: 20%;
2) row II level flyash is done by power plant: 70%, and Blain specific surface 320m
2/ kg;
3) activity excitation component: 10%, wherein commercially available unslaked lime 8%, Na
2SO
42%, mix;
4) after desulfurated plaster is crushed to 1.25mm, with the flyash mixing and stirring, under state of nature air-dry 7 days;
5) desulfurated plaster after air-dry and mixture of fly ash are excited the component mixing and stirring with composite reactive again, obtaining with the fly ash-desulfuration gypsum is the concrete composite active mineral admixture of base material.
Be formulated as example with the C25 concrete, fly ash-desulfuration gypsum composite active mineral admixture equivalent of the present invention replaces cement 30%, the total consumption 310kg/m of concrete gel material
3, water-cement ratio 0.38 mixes the high efficiency water reducing agent pulvis, and volume is 1.0% of a binder total amount.
Test shows that the concrete 28d intensity of fly ash-desulfuration gypsum composite active mineral admixture reaches 32.5MPa, and the 28d contract with dry rate is 340 microstrains, satisfies the actual requirement of engineering, and the fresh concrete good fluidity, slump 155mm.
Embodiment 5
The concrete fly ash-desulfuration gypsum composite active mineral admixture, according to following mass ratio chosen material:
1) power plant desulfurization gypsum: 35%;
2) row I level flyash is done by power plant: 55%, and Blain specific surface 420m
2/ kg;
3) activity excitation component: 10%, wherein commercially available unslaked lime 8.0%, Na
2SO
42.0%, mix;
4) after desulfurated plaster was crushed to 1.25mm, with the flyash mixing and stirring, baking was 1 hour under 55 ℃ of conditions of loft drier;
5) dried desulfurated plaster and mixture of fly ash are excited the component mixing and stirring with composite reactive again, obtaining with the fly ash-desulfuration gypsum is the concrete composite active mineral admixture of base material.
Be formulated as example with the C40 concrete, fly ash-desulfuration gypsum composite active mineral admixture equivalent of the present invention replaces cement 25%, the total consumption 380kg/m of concrete gel material
3, water-cement ratio 0.34 mixes the high efficiency water reducing agent pulvis, and volume is 1.0% of a binder total amount.
Test shows that the concrete 28d intensity of fly ash-desulfuration gypsum composite active mineral admixture reaches 49.1MPa, and the 28d contract with dry rate is 305 microstrains, satisfies the actual requirement of engineering, and the fresh concrete good fluidity, slump 105mm.
Embodiment 6
To produce 200000 side's concrete production lines per year is example, the about 340kg of C30 concrete gel material total mass, and the fly ash-desulfuration gypsum composite active mineral admixture volume is estimated (actual capabilities are greater than 30%) with 30%:
Material cost: 360 yuan/t of 42.5 ordinary Portland cements; 80 yuan/t of II level flyash flyash; 0 yuan/t of more low-quality desulfurated plaster
By desulfurated plaster account for adulterant mass ratio 35%, flyash accounts for 57%
Composite reactive excites component: be mixed in proportion the back with 1000 yuan/t, volume 8%
Then fly ash-desulfuration gypsum composite active mineral fusion material cost is:
80 yuan/t * 57%+0 unit/t * 35%+1000 unit/t * 8%=125.6 unit/t
Newly-increased cost behind fly ash-desulfurated plaster composite blend (as power consumption, artificial etc.): 6 yuan/t
Production cost is compared 1m with the normal concrete of not mixing mineral admixture
3Commerical ready-mixed concrete is saved cost:
Therefore, annual this concrete production line is saved 23.3 yuan/m of cost
3* 20 ten thousand m
3=466 ten thousand yuan
Aforementioned calculation meter concrete technical feature improves economic benefit and the economy of power plant income of being brought; If desulfurated plaster and the further commercialization of powdered coal ash, the economy of power plant benefit is huge.
The present invention can make enterprise of power plant, concrete production enterprise and concrete applying unit realize win-win.
Claims (9)
1, a kind of concrete fly ash-desulfuration gypsum composite active mineral admixture is characterized in that, described adulterant excites component to mix by flyash, desulfurated plaster, composite reactive; Flyash accounts for 45～70% of adulterant total mass, and desulfurated plaster accounts for 15～40% of adulterant total amount, and composite reactive excites 5～10% of ingredients constitute adulterant total mass; Described composite reactive excites component by unslaked lime and Na
2SO
4Form, the unslaked lime volume is 4～8% of an adulterant total mass, Na
2SO
4Volume is no more than 2% of adulterant total mass.
2, fly ash-desulfuration gypsum composite active mineral admixture according to claim 1, it is characterized in that: the mass ratio of each ingredients constitute adulterant total mass of described adulterant is: flyash 50～60%, desulfurated plaster 20～30%, unslaked lime 4～8%, Na
2SO
41.5～2%.
3, fly ash-desulfuration gypsum composite active mineral admixture according to claim 1 and 2 is characterized in that: described desulfurated plaster is taken from the coal-fired plant flue gas desulfuration byproduct, comprises CaSO
42H
2O, CaSO
42H
2The O quality is not less than 80% of desulfurated plaster total mass, and attached water content is no more than 4% of desulfurated plaster total mass.
4, fly ash-desulfuration gypsum composite active mineral admixture according to claim 1 and 2, it is characterized in that: described flyash is taken from and is not less than the fly ash grain that row II level is done by the coal-burning power plant, and the Blain specific surface of described flyash is not less than 300m
2/ kg.
5, fly ash-desulfuration gypsum composite active mineral admixture according to claim 1 and 2 is characterized in that: CaO content is not less than 95% in the described unslaked lime.
6, the preparation method of the described fly ash-desulfuration gypsum composite active mineral admixture of claim 1 is characterized in that, described preparation method is as follows:
1) in advance with the desulfurated plaster fragmentation, will account for then adulterant total mass 45%～70% flyash, account for adulterant total mass 15%～40% desulfurated plaster and mix and to mix thoroughly, and dry;
2) will account for the unslaked lime of adulterant total mass 4～8% and be no more than 2% Na of adulterant total mass again
2SO
4Mixing and stirring forms composite reactive and excites component;
4) will mix at last and dried desulfurated plaster and flyash again with activity excitation component mixing and stirring, described adulterant.
7, fly ash-desulfuration gypsum composite active mineral admixture according to claim 6, it is characterized in that the per-cent that the addition of described each component of adulterant accounts for the adulterant total mass is: flyash 50～60%, desulfurated plaster 20～30%, unslaked lime 4～8%, Na
2SO
41.5～2%.
8, fly ash-desulfuration gypsum composite active mineral admixture according to claim 6, it is characterized in that, desulfurated plaster in the described step 1) is crushed to granular size and is no more than 1.25mm, described drying is under 50 ℃～90 ℃ conditions dry 1～2 hour, and perhaps natural air drying or airing are 6～8 days.
9, the application of the described fly ash-desulfuration gypsum composite active mineral admixture of claim 1 is characterized in that, described fly ash-desulfuration gypsum composite active mineral admixture volume be in the concrete gelling material total mass 20～50%.
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|---|---|---|---|
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102452814A (en) * | 2010-10-19 | 2012-05-16 | 上海城建物资有限公司 | High strength concrete adopting desulfurized gypsum as activator, and preparation method thereof |
| CN102659374A (en) * | 2012-04-13 | 2012-09-12 | 江苏建华管桩有限公司 | Active synergist for concrete and cement products |
| CN104876459A (en) * | 2015-05-15 | 2015-09-02 | 中南大学 | Coal ash activated excitant and high-content high-calcium fly-ash cement |
| CN107913688A (en) * | 2017-11-17 | 2018-04-17 | 天津海得润滋建材有限公司 | The preparation process of modified coal ash |
| CN108033731A (en) * | 2017-12-29 | 2018-05-15 | 成都精准混凝土有限公司 | Decorate granolithic concrete and its preparation process |
| CN110903048A (en) * | 2019-11-22 | 2020-03-24 | 湖北大学 | High-activity ultrafine mineral admixture and preparation method thereof |
| CN111517689A (en) * | 2020-05-08 | 2020-08-11 | 张延年 | High-efficiency fly ash activator and preparation method thereof |
| CN114772966A (en) * | 2022-04-20 | 2022-07-22 | 朱娜 | Composite admixture for concrete and production method thereof |
-
2009
- 2009-03-27 CN CNA2009100429726A patent/CN101549987A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102452814A (en) * | 2010-10-19 | 2012-05-16 | 上海城建物资有限公司 | High strength concrete adopting desulfurized gypsum as activator, and preparation method thereof |
| CN102659374A (en) * | 2012-04-13 | 2012-09-12 | 江苏建华管桩有限公司 | Active synergist for concrete and cement products |
| CN104876459A (en) * | 2015-05-15 | 2015-09-02 | 中南大学 | Coal ash activated excitant and high-content high-calcium fly-ash cement |
| CN107913688A (en) * | 2017-11-17 | 2018-04-17 | 天津海得润滋建材有限公司 | The preparation process of modified coal ash |
| CN108033731A (en) * | 2017-12-29 | 2018-05-15 | 成都精准混凝土有限公司 | Decorate granolithic concrete and its preparation process |
| CN110903048A (en) * | 2019-11-22 | 2020-03-24 | 湖北大学 | High-activity ultrafine mineral admixture and preparation method thereof |
| CN111517689A (en) * | 2020-05-08 | 2020-08-11 | 张延年 | High-efficiency fly ash activator and preparation method thereof |
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