CN100400454C - Compound material for preparing cement and concrete - Google Patents

Compound material for preparing cement and concrete Download PDF

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Publication number
CN100400454C
CN100400454C CNB2005100800309A CN200510080030A CN100400454C CN 100400454 C CN100400454 C CN 100400454C CN B2005100800309 A CNB2005100800309 A CN B2005100800309A CN 200510080030 A CN200510080030 A CN 200510080030A CN 100400454 C CN100400454 C CN 100400454C
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cement
concrete
calcium fly
content
compound material
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Expired - Fee Related
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CNB2005100800309A
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CN1699246A (en
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徐尔昌
余健源
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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02WCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00Technologies for solid waste management
    • Y02W30/50Reuse, recycling or recovery technologies
    • Y02W30/91Use of waste materials as fillers for mortars or concrete

Abstract

The present invention discloses a composite material for preparing cement and concrete. High-calcium fly ash or/and medium-calcium fly ash and desulfurized gypsum are used as main components, and construction lime and triethanolmine used as secondary components are proportionally added to the main components; the main components, the secondary components and water are mixed, forcibly stirred, and put still at room temperature for 2 to 5 hours so as to make the powdery composite material for cement and concrete; when used for preparing cement or concrete, the composite material for cement and concrete enables the cement and the concrete to have high stability and high strength, reduces the preparation cost of the cement and the concrete, and meanwhile solves the problem of environmental pollution of waste materials generated from coal fueled stations.

Description

A kind ofly be used to prepare cement and concrete compound material
Affiliated technical field
The present invention relates to cement and concrete industry technical field, relate to a kind of be used to prepare cement and concrete compound material specifically.
Background technology
Current, the preparation method of general ordinary Portland cement is, by the raw material of forming after Wingdale, clay and the auxiliary material batching, through levigate and high-temperature calcination, be prepared into grog, levigate behind grog and flyash or the feed proportionings such as slag and plaster of paris stone, be prepared into cement at last again.Usually the blended material that is used for calling cement, and plaster of paris stone is called the retardant of cement with raw material blended flyash and slag.The preparation method of normal concrete then is, cement, sand, stone, flyash or raw materials such as ground slag powder and admixture are added the water batching after, through stirring, casting and maintenance, be prepared into concrete at last.Usually flyash and ground slag powder etc. is called concrete adulterant.
Because scoriaceous market supply quantity not sufficient and ground slag powder production cost are higher, flyash has become a kind of indispensable important source material in cement and the concrete industry production thereof, the source of flyash is, the fuel-burning power plant that with the coal is fuel sprays into the levigated coal dust in the boiler usually, combustibleconstituents in the coal dust burns immediately and produces high temperature, be the inorganic component of main component with the clay mineral in the coal dust, through high-temperature calcination, along with flue gas together enters in the electric precipitator, under the effect of high pressure static electricity, from flue gas, separate, form a kind of glass microballon and account for 70~90% pulverulent material, be referred to as flyash.SiO in the chemical ingredients of flyash 2And Al 2O 3Content is higher usually, and CaO content then changes big and has considerable influence for the performance variation of flyash along with coal is different.The common both at home and abroad at present difference according to CaO content is divided into three classes to flyash: the CaO content of the flyash that bituminous coal obtains is referred to as low calcium fly ash less than 10%; The CaO content of the flyash that burning subbituminous coal or brown coal obtain is referred to as high-calcium fly ass greater than 20%; The CaO content of the flyash that mixed firing bituminous coal and subbituminous coal or brown coal obtain is 10~20%, is referred to as middle calcium fly ash.In general, the CaO content along with flyash raises the f-CaO of the dead roasting in the flyash (free calcium oxide) content and CaSO 4(dehydrated gyp-) content is (generally with SO 3Content is represented) also can correspondingly raise, will seriously influence cement and concrete stability thereof.Thereby need make strict restriction, for example, European standard EN450 " Fly Ash for Concrete " regulation: the f-CaO content in the flyash should be not more than 1%, SO 3Content should be not more than 3%.In above three kinds of flyash, have low calcium fly ash only and meet this standard-required, thereby low at home and abroad calcium ash has been widely used as cement and concrete compound material.But low calcium fly ash only belongs to the pozzolanic activity material, high-calcium fly ass and middle calcium fly ash then belong to and very approach scoriaceously have potential gelation activity material, thus when high-calcium fly ass and middle calcium fly ash are used as cement and concrete compound material for the contribution of cement and concrete intensity thereof obviously greater than low calcium fly ash.But, the f-CaO content and the SO of high-calcium fly ass and middle calcium fly ash 3Content all surpasses the standard-required of above-mentioned relevant stability, so do not allow as cement and concrete compound material.Therefore, eliminate f-CaO and CaSO in high-calcium fly ass and the middle calcium fly ash effectively 4For the detrimentally affect of cement and concrete stability thereof, then become the guardian technique link that reasonably develops high-calcium fly ass and middle calcium fly ash resource.
In addition, domestic and international research shows, because Al in the chemical ingredients of flyash 2O 3Content is higher, if not only contain Ca (OH) in the system of place 2But also contain CaSO 42H 2O will increase the ability that flyash is participated in chemical reaction, generates more C-S-H gel, and makes it part conversion generation ettringite (3CaOAl 2O 33CaSO 432H 2O) crystal, thus help improving early strength before 28d of cement and concrete thereof, reduce concrete volumetric shrinkage and improve concrete degree of compactness.Yet, in present Cement industry is produced, the SO that the plaster of paris stone amount that adds in cement is equivalent to introduce 3Measure approximately 3%, promptly be equivalent to the CaSO that introduces 42H 2It is about 6.5% that O measures, and only is that the retardant as cement uses.When if actual needs mixes relatively large flyash in cement and concrete thereof, the CaSO that only introduces then by the plaster of paris stone in the cement 42H 2The O amount then obviously is insufficient, will be unfavorable for promoting flyash to participate in chemical reaction, and the ettringite that a part has been generated transforms the doctor negative sulplo-aluminate (3CaOAl of generation 2O 3CaSO 410H 2O), thus produce very adverse influence for cement and concrete intensity thereof.
Summary of the invention
The objective of the invention is to make full use of high-calcium fly ass and middle calcium fly ash and prepare compound material on cement and the coagulation, help improving cement and concrete stability and intensity, reduce cement and concrete preparation cost simultaneously.
In order to achieve the above object, the present invention is by the following technical solutions: a kind ofly be used to prepare cement and concrete compound material, be characterized in: with high-calcium fly ass or/and middle calcium fly ash and desulfurated plaster are main component, add building lime, trolamine submember and add water and mix back pressure stirring, in the insulation storehouse, left standstill 2-5 hour, make the cement and the concrete compound material of dry powder, wherein each material composition formula range is as follows, all by weight percentage:
High-calcium fly ass is or/and middle calcium fly ash 55-90%
Desulfurated plaster 10-35%
Building lime 0-10%
Trolamine 0-0.5%
Above the described high-calcium fly ass fineness that is should reach II level ash standard (the 0.045mm square hole sieve tails over and is not more than 20%), CaO content is 20-30% in its chemical ingredients, wherein f-CaO content is greater than 1%, SO 3Content is greater than 3%.
The fineness of calcium fly ash should reach II level ash standard (0.045 square hole sieve tails over and is not more than 20%) in recited above, and CaO content is 10~20% in its chemical ingredients, and wherein f-CaO content is greater than 1%, SO 3Content is less than 3%.
Above described desulfurated plaster be the pulverulent material of a kind of humidity of in sweetening process, producing of the flue gas of power plant burning coal, its fineness should reach II level ash standard (the 0.045mm square hole sieve tails over and is not more than 20%), CaSO 42H 2O content is not less than 85%, and free water content is not higher than 15%.
Building lime recited above is also referred to as calcium lime powder, is natural limestone through calcining and levigate and make pulverulent material, and its f-CaO content is not less than 70%, and MgO content is not higher than 5%.
The principle that the present invention prepares cement and concrete compound material is such, handle the industrial waste that produces owing to when desulfurated plaster is coal-fired station's combusting coal fines flue gas is carried out desulfurization, its fineness has reached II level ash standard (the 0.045mm square hole sieve tails over and is not more than 20%), its CaSO 42H 2O content generally is not less than 85%, and free water content generally is not higher than 15%, and therefore, desulfurated plaster is that a kind of plaster of paris stone that replaces in cement and concrete thereof is introduced CaSO 42H 2The very good industrial waste resource of O.Therefore, when preparing to mix relatively large flyash in cement and concrete thereof, for guaranteeing cement and concrete early strength thereof, the present invention adopts desulfurated plaster to introduce CaSO 42H 2O, but, if do not remove in the desulfurated plaster free water just it directly and cement clinker together add grinding machine and grind, then can reduce cement and concrete intensity, remove free water in the desulfurated plaster as the method that adopts oven dry in advance, not only energy consumption is higher, but also may make a part of material burning, is transformed into semi-hydrated gypsum (CaSO 41/2H 2O), will cause cement false set, so also be unallowed, when high-calcium fly ass or/and middle calcium fly ash, desulfurated plaster, unslaked lime and add water batching after, in mixer, force to stir, and after in the insulation feed bin, depositing 2~5 hours the free water in the desulfurated plaster and add water and will at first cause f-CaO hydration heat light-burned in the building lime, improve material temperature, thereby promote the f-CaO and the CaSO of the dead roasting in high-calcium fly ass or the middle calcium fly ash 4Finish hydration reaction, transform generation for the harmless Ca of stability (OH) 2And CaSO 42H 2O.F-CaO and CaSO in high-calcium fly ass or the middle calcium fly ash so both can have been eliminated effectively 4For the detrimentally affect of cement and concrete stability thereof, can automatically adsorb to fall the free water in the desulfurated plaster again, thereby reach the effect of killing two birds with one stone.F-CaO and CaSO in high-calcium fly ass or the middle calcium fly ash 4And the major part of the total water requirements of the f-CaO in the building lime when finishing hydration reaction satisfies by the free water amount that desulfurated plaster contains, and insufficient section then satisfies by adding water; Desulfurated plaster be the effect be the CaSO that induces one 42H 2O can increase the ability that flyash is participated in chemical reaction and generated ettringite, thereby improves cement and concrete intensity thereof.
Trolamine [N (CH 2CH 2OH) 3] be a kind of cationic surfactant, mixing it in the preparation process of cement and the compound material of concrete helps that material is uniformly dispersed and also helps being uniformly dispersed apace in the concrete mix that material makes afterwards, for guarantee that trolamine sneaks in the material equably in preparation process, require trolamine mixed in advance and add in the water and in the material whipping process, mix among the material.
Owing to adopted technique scheme and composition of raw materials, make cement and concrete compound material that the present invention prepares can help improving cement and concrete stability and intensity, also reduce cement and concrete preparation cost, also solved coal-fired power plant's waste material environmental pollution problems simultaneously.
Embodiment
Below by specific embodiment in detail this patent is described in detail:
Embodiment 1
With middle calcium fly ash, desulfurated plaster, building lime, trolamine and water by following material fiting ratio (weight percent) batching, force to stir after, in finished bin, deposited 2~5 hours, be prepared into the compound material of cement:
Middle calcium fly ash 70%
Desulfurated plaster 25%
Building lime 4.7%
Trolamine 0.3%
Embodiment 2
Method is same as embodiment 1, and middle calcium fly ash is changed to high-calcium fly ass:
High-calcium fly ass 70%
Desulfurated plaster 29.8%
Trolamine 0.2%
Embodiment 3
Method is same as embodiment 1
The material fiting ratio (weight percent) of the compound material of preparation concrete:
Middle calcium fly ash 75%
Desulfurated plaster 15%
Building lime 9.8%
Trolamine 0.2%
Embodiment 4
Method is same as embodiment 1
High-calcium fly ass 35%
Middle calcium fly ash 40%
Desulfurated plaster 15%
Building lime 9.8%
Trolamine 0.2%
Desulfurated plaster is to adopt butt to prepare burden in above embodiment, adds water and adds in the ratio of actual demand.

Claims (5)

1. one kind is used to prepare cement and concrete compound material, it is characterized in that: with high-calcium fly ass or/and middle calcium fly ash and desulfurated plaster are main component, add building lime, trolamine submember and add water and mix back pressure stirring, in the insulation storehouse, left standstill 2-5 hour, make the cement and the concrete compound material of dry powder, wherein each material composition formula range is as follows, all by weight percentage:
High-calcium fly ass is or/and middle calcium fly ash 55-90%
Desulfurated plaster 10-35%
Building lime 0-10%
Trolamine 0-0.5%
Above-mentioned each material composition sum is 100%.
2. according to claim 1ly be used to prepare cement and concrete compound material, it is characterized in that: the fineness of described high-calcium fly ass is not more than 20% for the 0.045mm square hole sieve tails over, CaO content in its chemical ingredients is 20~30%, and wherein f-CaO content is greater than 1%, SO 3Content is greater than 3%.
3. according to claim 1ly be used to prepare cement and concrete compound material, it is characterized in that: the fineness of calcium fly ash is not more than 20% for the 0.045mm square hole sieve tails in described, CaO content is 10~20% in its chemical ingredients, and wherein f-CaO content is greater than 1%, SO 3Content is less than 3%.
4. a kind of be used to prepare cement and concrete compound material according to claim 1, it is characterized in that: described desulfurated plaster is a pulverulent material, its fineness should be the 0.045mm square hole sieve and tails over and be not more than 20%, wherein CaSO 42H 2O content is not less than 85%, and free water content is not higher than 15%.
5. a kind of be used to prepare cement and concrete compound material according to claim 1, it is characterized in that: described building lime, be Wingdale through calcining and levigate and make pulverulent material, wherein f-CaO content is not less than 70%, and MgO content is not higher than 5%.
CNB2005100800309A 2005-06-28 2005-06-28 Compound material for preparing cement and concrete Expired - Fee Related CN100400454C (en)

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CN100400454C true CN100400454C (en) 2008-07-09

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Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101508535B (en) * 2009-03-20 2011-08-10 广东水电二局股份有限公司 Concrete external doped composite material and method of producing the same
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
CN108585735B (en) * 2018-05-18 2021-03-05 郑州市建文特材科技有限公司 Plugging agent and preparation method thereof
CN109592920B (en) * 2018-11-05 2021-06-18 山东新大地环保建材有限公司 Filling material based on thermal power plant waste, preparation device and method and application thereof
CN115504729A (en) * 2021-06-22 2022-12-23 国家能源投资集团有限责任公司 Cementing material composition, cementing material, preparation method and application thereof

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
HUP9701462A2 (en) * 1996-09-04 2002-12-28 Wopfinger Stein- Und Kalkwerke Schmid & Co. Method for producing of construction material and aparatous for making thereof
CN1562851A (en) * 2004-03-16 2005-01-12 徐尔昌 Earth cementation agent in use for roadway construction

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
HUP9701462A2 (en) * 1996-09-04 2002-12-28 Wopfinger Stein- Und Kalkwerke Schmid & Co. Method for producing of construction material and aparatous for making thereof
CN1562851A (en) * 2004-03-16 2005-01-12 徐尔昌 Earth cementation agent in use for roadway construction

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