CN107139325B - A kind of method of wet grinding cement preparation ready-mixed concrete - Google Patents
A kind of method of wet grinding cement preparation ready-mixed concrete Download PDFInfo
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- CN107139325B CN107139325B CN201710495096.7A CN201710495096A CN107139325B CN 107139325 B CN107139325 B CN 107139325B CN 201710495096 A CN201710495096 A CN 201710495096A CN 107139325 B CN107139325 B CN 107139325B
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- 239000004568 cement Substances 0.000 title claims abstract description 101
- 238000000034 method Methods 0.000 title claims abstract description 66
- 238000001238 wet grinding Methods 0.000 title claims abstract description 46
- 238000002360 preparation method Methods 0.000 title claims abstract description 29
- 239000000463 material Substances 0.000 claims abstract description 65
- 229910052602 gypsum Inorganic materials 0.000 claims abstract description 57
- 239000010440 gypsum Substances 0.000 claims abstract description 57
- 238000000227 grinding Methods 0.000 claims abstract description 49
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 41
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 27
- 239000002002 slurry Substances 0.000 claims abstract description 19
- 238000002156 mixing Methods 0.000 claims abstract description 13
- 238000003756 stirring Methods 0.000 claims description 26
- 239000000843 powder Substances 0.000 claims description 12
- 150000001875 compounds Chemical class 0.000 claims description 6
- 239000011268 mixed slurry Substances 0.000 claims description 6
- 239000004615 ingredient Substances 0.000 claims description 4
- 239000000203 mixture Substances 0.000 claims description 4
- 230000008569 process Effects 0.000 abstract description 19
- 238000004519 manufacturing process Methods 0.000 abstract description 11
- 238000010298 pulverizing process Methods 0.000 abstract description 9
- 239000000428 dust Substances 0.000 abstract description 4
- 239000008187 granular material Substances 0.000 abstract description 2
- 238000005516 engineering process Methods 0.000 description 8
- -1 admixture B Substances 0.000 description 5
- 238000005345 coagulation Methods 0.000 description 4
- 230000015271 coagulation Effects 0.000 description 4
- 238000009833 condensation Methods 0.000 description 4
- 230000005494 condensation Effects 0.000 description 4
- 239000002994 raw material Substances 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 230000018044 dehydration Effects 0.000 description 2
- 238000006297 dehydration reaction Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 239000002893 slag Substances 0.000 description 2
- 239000002689 soil Substances 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- 239000012615 aggregate Substances 0.000 description 1
- 238000000498 ball milling Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000006071 cream Substances 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 230000023556 desulfurization Effects 0.000 description 1
- 230000003467 diminishing effect Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000010881 fly ash Substances 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 229910021653 sulphate ion Inorganic materials 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28C—PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28C5/00—Apparatus or methods for producing mixtures of cement with other substances, e.g. slurries, mortars, porous or fibrous compositions
- B28C5/003—Methods for mixing
-
- 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
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Structural Engineering (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Preparation Of Clay, And Manufacture Of Mixtures Containing Clay Or Cement (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The present invention relates to a kind of methods of wet grinding cement preparation ready-mixed concrete, and at ready-mixed concrete scene, the water of mixing concrete is used for the preparation ready-mixed concrete of wet grinding cement.Clinker and the pre- grinding of the natural gypsum to partial size are first no more than 0.2mm, then by water-reducing agent, water and admixture, it is mixed with the material after pre- grinding and carries out wet ball grinding grinding, concrete mixer is added after the cement slurry after grinding is mixed with the admixture for needing to be spiked into ready-mixed concrete again, coarse-fine aggregate is added simultaneously, it is agitated uniformly to obtain ready-mixed concrete.The present invention changes traditional dry method pulverizing cement ready-mixed concrete, using live wet process pulverizing cement, due to clinker be it is granular, transport is more convenient, and transportation cost is low；Dust pollution is not generated in grinding, mill efficiency is high, improves cement granules pattern and gradation, and the quality stability of cement reduces the pollution of transportational process and concrete production process to environment, economic and environment-friendly.
Description
Technical field
The invention belongs to technical field of concrete preparation, and in particular to a kind of preparation ready-mixed concrete of wet grinding cement
Method.
Background technique
The preparation of existing concrete is simply by by cement, admixture, coarse aggregate, fine aggregate, water, and water-reducing agent mixes in proportion
Conjunction is prepared, and flow chart is as shown in Figure 1, the bulk cement used during the preparation process is generally P.042.5 cement, in water
Mud station-service bulk vehicle is transported to mixing plant and is stored in cement bulk library, then live by bulk cement and admixture, water, diminishing
Agent, thick, fine aggregate measure latter in proportion and stir into concrete.
It is all made of dry method pulverizing cement when preparing concrete at present, cement grinding is the important link of manufacture of cement, grinding
Cost accounts for 35% or so of manufacture of cement totle drilling cost, and grinding pow consumption accounts for 70% or so of the comprehensive power consumption of manufacture of cement.Existing ball milling
Dry method pulverizing cement prepares concrete and has the following deficiencies:
1, clinker granularity after Grinding Process in Cement Plants is thinner, and transportational process needs powder special equipment, and (powder is in bulk
Vehicle), and cargo handling process has secondary pollution.
2, dry method grinding grinds interior temperature height, is also easy to produce gypsum dehydration, influences cement quality；Phenomenon easy to produce static electricity simultaneously,
So that particle is reunited again, influences cement fineness and efficiency；The sphericity of cement granules pattern is inadequate, final influence concrete
Construction quality (such as: water requirement, slump).
3, ball mill ventilation generates a large amount of dusty gas in grinding process, is easy to pollute the environment, and handles dust-laden
Gas technology and equipment cost are high.
4. measuring accuracy is inaccurate, during cement enters concrete mixer, due to needing to add water, aqueous vapor occur will
It the phenomenon that cement discharging blockage, influences to produce.
5, in concrete whipping process, there are dust pollution and mixing evenness for the cement of dry method grinding and admixture not
Good phenomenon.
Summary of the invention
The object of the present invention is to provide a kind of methods of wet grinding cement preparation ready-mixed concrete, can reduce cement fortune
Defeated cost, the efficiency for improving cement grinding, the quality stability for promoting cement production process, reduction transportational process and coagulation are autochthonal
Pollution of the production process to environment, and improve the granule-morphology of cement, the final quality for improving concrete.
The object of the invention to solve the technical problems adopts the following technical solutions to realize.It proposes according to the present invention
A kind of wet grinding cement preparation ready-mixed concrete method, comprising the following steps:
(1) clinker is subjected to pre- grinding than mixing according to metering with the natural gypsum first, pre- grinding uses dry method, will
Material particular diameter is milled to no more than 0.2mm, obtains compound powder X；
(2) admixture B, water and water-reducing agent are mixed evenly according to metering than feeding, obtain mixed slurry Y；
(3) stream ball mill is opened into compound powder X and mixed slurry Y addition, carries out wet grinding, it is defeated by shurry pump later
It send into stirring pool, according to metering than admixture A is added, stirs evenly, obtain slurry Z；
(4) by slurry Z by the metered concrete mixer of scooping feeding device, while by thick, fine aggregate according to metering
Than the concrete mixer is added, by stirring to get ready-mixed concrete.
Following technical scheme can be used also to realize in the object of the invention to solve the technical problems.
A kind of method of wet grinding cement preparation ready-mixed concrete, comprising the following steps:
(1) clinker is subjected to pre- grinding than feeding according to metering first, pre- grinding uses dry method, by clinker grain
Diameter is milled to no more than 0.2mm, obtains material M；
(2) desulfurized gypsum, admixture B, water and water-reducing agent are mixed evenly according to metering than feeding, obtain material N；
(3) stream ball mill is opened into material M and material N addition, carries out wet grinding, stirring is delivered to by shurry pump later
Chi Zhong stirs evenly according to metering than admixture A is added, obtains slurry Z；
(4) by slurry Z by the metered concrete mixer of scooping feeding device, while by thick, fine aggregate according to metering
Than the concrete mixer is added, by stirring to get ready-mixed concrete.
The object of the invention to solve the technical problems also can be used following technical measures and further realize.
A kind of method of wet grinding cement preparation ready-mixed concrete above-mentioned, the composition of the admixture A and admixture B
It is identical.
A kind of method of wet grinding cement preparation ready-mixed concrete above-mentioned, the clinker, gypsum, admixture B,
Admixture A tetra- is at being grouped as cementitious material, the quality hundred of the clinker, gypsum, tetra- admixture B, admixture A ingredients
Dividing the sum of ratio is 100%.
A kind of method of wet grinding cement preparation ready-mixed concrete above-mentioned, the dosage of the cementitious material is every cube
Concrete 260~550kg of cementitious material；In cementitious material, clinker, gypsum, admixture B, admixture A quality percentage
Than being respectively as follows:
Clinker: [(100-a) × 0.80)] %；
Gypsum: (b2/b1) × 5%；
Admixture B:[(100-a) × 0.15] %；
Admixture A:{ a- [5 × b2/b1- 0.05 × (100-a)] } %；
Wherein, a=20~50, b1=(2.2~2.4) %, b2=(2.6~2.8) %.
A kind of method of wet grinding cement preparation ready-mixed concrete above-mentioned, every cube of concrete amount of water is 170~
175kg；The additional amount of water-reducing agent is that every cube of concrete adds 1.7~8.75kg.
A kind of method of wet grinding cement preparation ready-mixed concrete above-mentioned, the additional amount of water are 0.32 according to water-cement ratio
~0.60 is metered；The additional amount of water-reducing agent is 1.0%~5.0% metered according to water consumption.
A kind of method of wet grinding cement preparation ready-mixed concrete above-mentioned, slurry Z and thick, fine aggregate in stirring pool
When concrete mixer is added, the dosage of coarse aggregate and fine aggregate be respectively as follows: every cube of concrete of coarse aggregate add 1060~
1120kg, every cube of concrete of fine aggregate add 600~850kg.
Cement grinding is moved on to concrete mixing plant from cement plant by the present invention, using wet grinding technique scene premixing coagulation
Soil.The clinker of cement plant production be it is granular, more P.042.5 bulk cement (powder) is convenient for transport, using common truck fortune
It is defeated, after transporting to concrete mixing plant, clinker and the natural gypsum are first directly subjected to pre- grinding, according to desulfurization stone
Cream, then only clinker need to be carried out to pre- grinding, the material particular diameter after pre- grinding be no more than 0.2mm, then by admixture B, water,
Water-reducing agent stirs evenly, or desulfurized gypsum and admixture B, water, water-reducing agent are stirred evenly, later by the material after pre- grinding
Carry out wet grinding with containing the slurry of water-reducing agent and admixture B, obtain slurry, slurry together with admixture A after mixing evenly
Concrete mixer is added with scooping feeding device, ready-mixed concrete is prepared in stirring together with thick, fine aggregate.
It advantages of the present invention and has the technical effect that
1, traditional method be clinker and admixture B (15%) and gypsum are obtained in cement plant dry method grinding it is in bulk
Cement, that is, P.042.5 cement, then the cement is transported to concrete stirring scene with bulk vehicle and is prepared with the stirring of other auxiliary materials
Concrete needs dedicated transport vehicle, and transport and unavoidably generate with concrete whipping process since bulk cement is powdery
A large amount of dust causes seriously to pollute；
Method of the invention uses the direct site operation of clinker, and clinker is transported to concrete and stirs scene,
Scene with the pre- grinding of gypsum after again with other auxiliary material (admixture, water-reducing agent, water, aggregate etc.) common wet ball grindings, due to cement
Clinker is granular, more traditional P.042.5 bulk cement (powder) convenience of transport, cargo handling process and the pollution of concrete preparation process
It is smaller.
2, pre- grinding to partial size is no more than 0.2mm in advance for clinker and gypsum, then carries out with water-reducing agent, water, admixture
When wet grinding, temperature in mill can be reduced, gypsum dehydration is not likely to produce；And wet grinding process does not generate electrostatic effect, efficiency
It is high compared with dry method grinding.
3, wet grinding process of lapping is easier to that clinker is made to generate spherical shape, improves of cement due to there is water
Particle shape looks are conducive to the workability for improving concrete.
4, cementitious material is not required to consider to add water and stir uniformity problem in concrete mixer when wet grinding, only and slightly
Fine aggregate stirs evenly, and in identical mixing time, this concrete homogenieity is more preferable.
5, exhaust gas is not generated during wet grinding, is not necessarily to dust removal installation, reduces equipment investment cost, it is autochthonal in coagulation
Pollution is not generated yet during producing, and is conducive to environmental protection.
The above description is only an overview of the technical scheme of the present invention, in order to better understand the technical means of the present invention,
And it can be implemented in accordance with the contents of the specification, and in order to allow above-mentioned advantage and other purposes, feature and advantage of the invention
It can be more clearly understood, special below to lift preferred embodiment, detailed description are as follows.
Detailed description of the invention
Fig. 1 is the production technology that existing dry method pulverizing cement prepares concrete；
Fig. 2 is production technology of the present invention using the preparation ready-mixed concrete of natural gypsum wet grinding cement；
Fig. 3 is production technology of the present invention using the preparation ready-mixed concrete of desulfurated gypsum wet pulverizing cement.
Specific embodiment
It is of the invention to reach the technical means and efficacy that predetermined goal of the invention is taken further to illustrate, below in conjunction with
Attached drawing and preferred embodiment, to a kind of method of wet grinding cement preparation ready-mixed concrete proposed according to the present invention, tool
Body embodiment, feature and its effect, detailed description is as follows.
In order to more clearly show technical solution of the present invention, spy explains the noun occurred in the present invention.
Admixture A is identical with the ingredient of admixture B in attached drawing, merely for convenience of description, is respectively indicated, specifically
Ground, admixture A and admixture B are that (such as slag micropowder, flyash, the one or more of steel-making slag powder are mixed for existing admixture
It closes).Slightly, fine aggregate is existing using material.The present invention is intended to provide a kind of different methods for preparing concrete, used water
Mud clinker, admixture, thick, fine aggregate, water-reducing agent etc. are existing product.
It is well known that cementitious material is made of bulk cement and admixture A in concrete, the sum of the two weight percent is
100%.Bulk cement of the present invention refers to P.042.5 cement, is made of clinker, gypsum and admixture B, the bulk water
Mass percent shared by each ingredient of mud are as follows: clinker 80%, gypsum 5%, admixture B 15%.SO in cementitious material3
The gypsum being mainly derived from bulk cement, SO in bulk cement of the present invention3Content be b1=(2.2-2.4) %.
In Fig. 1, when the preparation ready-mixed concrete of existing dry method pulverizing cement, if in cementitious material admixture A quality
Percentage is a%, then the mass percent of bulk cement is (100-a) %；Due to SO in bulk cement3(deriving from gypsum)
Content is b1=(2.2-2.4) %, then in the cementitious material, admixture A, clinker, gypsum, admixture B, SO3Quality hundred
Score is respectively as follows:
Admixture A:a%；Wherein, a=(20-50)；
Clinker: (100-a) % × 80%=[(100-a) × 0.8] %；
Gypsum: (100-a) % × 5%=[(100-a) × 0.05] %；
Admixture B:(100-a) % × 15%=[(100-a) × 0.15] %；
SO3: (100-a) % × b1=[(100-a) × b1] %；Wherein, b1=(2.2-2.4) %.
When preparing concrete using live wet process pulverizing cement of the invention, due to clinker chance water generation hydration reaction
Condensation hardening, therefore wet grinding cement at the beginning when, cement begin to carry out aquation condensation.The general water of requirements of the national standard
The presetting period of mud is no earlier than 45 minutes, and final setting time is no more than 12 hours, and the presetting period of majority enterprise, China cement is in 70-
100 minutes, final setting time 150 minutes or so.If being more than certain time during wet grinding (absolutely no more than initial set
Time), the slump for making cement mixing and gradual loss is excessive (or even cannot prepare concrete), to influence mixed
Solidifying soil construction and service performance.Traditional ball mill without pre- grinding process opens stream technique, into grind materials granularity it is larger (5mm with
85%) upper material accounts for, cement residence time in grinding is long, generally at 20-25 minutes；After pre- grinding technology, into grind materials
Granularity is smaller (0.2mm or less), and cement shorter residence time in grinding generally 10-13 minutes, considers the factors such as transport, arrives
The concrete mixer time should be 15-18 minutes.When therefore using wet grinding cement, pre- grinding process shortens cement and is grinding
Interior aquation setting time, but still accordingly shorten compared with cement produced with the dry method concrete batching concrete setting time (
It is exactly 15-18 minutes needed for cement wet grinding process), therefore wet grinding method needs of the invention are taken and are arranged
It applies, inhibits condensation hardening of cement during wet grinding, its setting time is appropriately extended.
Gypsum is traditional retarder, and therefore, wet grinding cement preparation ready-mixed concrete key is that wet grinding
Suitably increase content (the namely raising SO of gypsum in the process3Content), inhibit condensation of cement during wet grinding.
The present invention is using the total gypsum content for improving cementitious material in concrete, by SO in cementitious material3Content improve to 2.6-
2.8%, gypsum is all added in wet grinding cement, since admixture A is added after grinding, this is opposite mentions
Gypsum content (the i.e. SO of high wet process pulverizing cement process3Content).
In conjunction with Fig. 2, the method for wet grinding cement preparation ready-mixed concrete provided by the present invention still sets cementitious material
The mass percent of middle admixture A is a%, then the sum of clinker, gypsum, admixture B the three institute in cementitious material in Fig. 2
The percentage accounted for is (100-a) %, then quality percentage shared in each comfortable cementitious material of clinker, gypsum, admixture B
Number is respectively as follows:
Clinker: (100-a) % × 80%=[(100-a) × 0.8] %；
Gypsum: (100-a) % × 5%=[(100-a) × 0.05] %；
Admixture B:(100-a) % × 15%=[(100-a) × 0.15] %；
Wherein, a=20-50.
In conjunction with above formula, gypsum content is reduced compared with P.O42.5 cement, then SO3Content reduces, specific reduction amount and admixture A
Addition content it is related, addition content is higher (namely a value is bigger), SO3Content reduction is bigger, then unfavorable to concrete coagulation,
And SO3Content reduces, and declines to the sulphate activation of cementitious material, and the service performance for influencing concrete is (age strength, resistance to
Long property etc.).
Since wet grinding cement key is to improve gypsum content (namely raising SO3Content), the present inventor exists
It is found in practical application, in ready-mixed concrete, admixture A is at 20% or more, SO3Mass percent in cementitious material
For b2When=(2.6-2.8) %, the ready-mixed concrete of preparation has preferable workability and service performance.Therefore, of the invention
Method be intended to control SO in cementitious material3Mass percent be b2=(2.6-2.8) %, i.e. raising SO3Content, this
Technology needs to realize by improving gypsum content.
If pressing existing proportion: the percentage composition of gypsum is [(100-a) × 0.05] % in cementitious material, is as a result less than
5%, SO in cementitious material3Content be [(100-a) × b1] %, b1=(2.2-2.4) %.If by SO in cementitious material3's
Content rises to b2When=(2.6-2.8) %, the gypsum content in cementitious material should are as follows: (b2/b1(result is greater than) × 5%
5%, it is equivalent to the content for improving gypsum), wherein b1=(2.2-2.4) %, b2=(2.6-2.8) %.
In Fig. 2, since the sum of admixture A, clinker, gypsum, admixture B mass percent are 100%, gypsum
Content increases, then the content of admixture A should be reduced, and the mass percent of final admixture A should are as follows: a%- [5% × b2/b1-
(100-a) % × 5%]={ a- [5 × b2/b1- 0.05 × (100-a)] } %.
I.e. according to the process of Fig. 2, the metering of each raw material are as follows:
In cementitious material, cement clinker quality percentage are as follows: [(100-a) × 0.80)] %；
Gypsum quality percentage are as follows: (b2/b1) × 5%；
Admixture B mass percent are as follows: [(100-a) × 0.15] %；
Admixture A mass percent are as follows: { a- [5 × b2/b1- 0.05 × (100-a)] } %；
Wherein, a=20~50, b1=(2.2~2.4) %, b2=(2.6~2.8) %.
The additional amount of water is 0.32~0.60 metered according to water-cement ratio；
The additional amount of water-reducing agent is 1.0%~5.0% metered according to water consumption；
Under normal circumstances, the additional amount of cementitious material is 260~550kg in every cube of concrete, then the additional amount of water is
Every cube of concrete adds 83~330kg, preferably 170~175kg, water-reducing agent additional amount be every cube of concrete add 0.8~
16.5kg, preferably 1.7~8.75kg, coarse aggregate additional amount are that every cube of concrete adds 1060~1120kg, fine aggregate additional amount
For every cube of 600~850Kg of concrete.
In above-mentioned quantitative relation, the value range of a is 20~50, b1=(2.2~2.4) %, b2=(2.6~2.8) %,
Specific value data will determine that the intensity that different brackets concrete requires is different, cementitious material according to concrete grade in performance
Ratio shared by middle admixture A is just different.
The premixing method of concrete when Fig. 2 is using the natural gypsum, Fig. 3 are the premixings using concrete when desulfurized gypsum
Method, when using desulfurized gypsum, the metering method and ratio of each raw material and Fig. 2 are identical when using the natural gypsum, only use
When desulfurized gypsum, since desulfurized gypsum is that powdery does not have to prior pre- grinding, clinker need to only be carried out to pre- grinding, other steps
It is identical.
Wet grinding is different from dry method grinding, slurry must have certain mobility after wet grinding, therefore water is mixed
Dosage must be reasonable, and certainly, moisture more large fluidity is better, but moisture is excessive unfavorable to subsequent concrete production, because not
With strength grade Concrete Design when have corresponding water-cement ratio, design strength is higher, and water-cement ratio is smaller, and concrete is most at present
Small design water-cement ratio is 0.32.And experiments have shown that, cement slurry will reach preferable mobility, the case where not mixing water-reducing agent
Under, water content needs to can be only achieved expected fluidity in 50% or so (i.e. water-cement ratio is 0.5).To solve cement slurry stream
Dynamic property problem adds water-reducing agent technology in conjunction with ready-mixed concrete, and in wet grinding cement, water-reducing agent should blend the present invention
It is added in material B and water or admixture B and water, desulfurized gypsum mixing process.
Embodiment 1:
In conjunction with Fig. 2, using the natural gypsum, ready-mixed concrete the preparation method comprises the following steps:
(1) clinker is subjected to pre- grinding than mixing according to metering with the natural gypsum first, pre- grinding uses dry method powder
Mill, material particular diameter is milled to less than or equal to 0.2mm, compound powder X is obtained；
(2) admixture B, water and water-reducing agent are mixed evenly according to metering than feeding, obtain mixed slurry Y；
(3) stream ball mill is opened into compound powder X and mixed slurry Y addition, carries out wet grinding, it is defeated by shurry pump later
It send into stirring pool, according to metering than admixture A is added, stirs evenly, obtain slurry Z；
(4) by slurry Z by the metered concrete mixer of scooping feeding device, while by thick, fine aggregate according to metering
Than the concrete mixer is added, by stirring to get ready-mixed concrete.
Wherein, the metering ratio of each raw material are as follows:
In cementitious material, cement clinker quality percentage are as follows: [(100-a) × 0.80)] %；
Gypsum quality percentage are as follows: (b2/b1) × 5%；
Admixture B mass percent are as follows: [(100-a) × 0.15] %；
Admixture A mass percent are as follows: { a- [5 × b2/b1- 0.05 × (100-a)] } %；
Wherein, wherein a=20~50, b1=(2.2~2.4) %, b2=(2.6~2.8) %.
Total additional amount of cementitious material adds 260~550kg according to every cube of concrete；
The additional amount of water is that 0.32-0.60 is metered according to water-cement ratio, preferably 170~175kg；
The additional amount of water-reducing agent is metered according to the 1.0%-5.0% of water consumption, preferably 1.7~8.75kg；
Coarse aggregate additional amount is that every cube of concrete adds 1060-1120kg, and fine aggregate additional amount is every cube of concrete
600-850Kg。
Embodiment 2:
In conjunction with Fig. 3, using desulfurized gypsum, ready-mixed concrete the preparation method comprises the following steps:
(1) clinker is subjected to pre- grinding than feeding according to metering first, pre- grinding uses dry method grinding, and cement is ripe
Material partial size is milled to no more than under 0.2mm, obtaining material M；
(2) desulfurized gypsum, admixture B, water and water-reducing agent are mixed evenly according to metering than feeding, obtain material N；
(3) stream ball mill is opened into material M and material N addition, carries out wet grinding, stirring is delivered to by shurry pump later
Chi Zhong stirs evenly according to metering than admixture A is added, obtains slurry Z；
(4) by slurry Z by the metered concrete mixer of scooping feeding device, while by thick, fine aggregate according to metering
Than the concrete mixer is added, by stirring to get ready-mixed concrete.
Wherein, the metering ratio of each raw material are as follows:
In cementitious material, cement clinker quality percentage are as follows: [(100-a) × 0.80)] %；
Gypsum quality percentage are as follows: (b2/b1) × 5%；
Admixture B mass percent are as follows: [(100-a) × 0.15] %；
Admixture A mass percent are as follows: { a- [5 × b2/b1- 0.05 × (100-a)] } %；
Wherein, wherein a=20~50, b1=(2.2~2.4) %, b2=(2.6~2.8) %.
Total additional amount of cementitious material adds 260~550kg according to every cube of concrete；
The additional amount of water is that 0.32-0.60 is metered according to water-cement ratio, preferably 170~175kg；
The additional amount of water-reducing agent is metered according to the 1.0%-5.0% of water consumption, preferably 1.7~8.75kg；
Coarse aggregate additional amount is that every cube of concrete adds 1060-1120kg, and fine aggregate additional amount is every cube of concrete
600-850Kg。
The above is only the preferred embodiment of invention, not does limitation in any form to the present invention, although
The present invention has been disclosed as a preferred embodiment, and however, it is not intended to limit the invention, any person skilled in the art,
Without departing from the scope of the present invention, when the technology contents using the disclosure above are modified or are modified to
With the equivalent embodiment of variation, but anything that does not depart from the technical scheme of the invention content, according to the technical essence of the invention to
Any simple modification, equivalent change and modification that upper embodiment is done, all of which are still within the scope of the technical scheme of the invention.
Claims (2)
1. a kind of method of wet grinding cement preparation ready-mixed concrete, it is characterised in that the following steps are included:
(1) percentage for accounting for cementitious material quality for the clinker of [(100-a) × 0.80] % and is accounted for into cementitious material first
The percentage of quality is (b2/b1The natural gypsum mixing of) × 5% carries out pre- grinding, and pre- grinding uses dry method grinding, by material grain
Diameter is milled to no more than 0.2mm, obtains compound powder X；
(2) admixture B, water and water-reducing agent that the percentage for accounting for cementitious material quality is [(100-a) × 0.15] % are mixed and is stirred
It mixes uniformly, obtains mixed slurry Y；Wherein, the additional amount of water and water-reducing agent according to every cube of concrete amount of water be 170~
175kg, water-reducing agent additional amount are that 1.7~8.75kg progress is metered；
(3) stream ball mill is opened into gained compound powder X and mixed slurry Y addition, carries out wet grinding, it is defeated by shurry pump later
It send into stirring pool, adds admixture A, stir evenly, obtain slurry Z；Wherein, the additional amount of admixture A accounts for cementitious material
The percentage of quality is { a- [5 × b2/b1- 0.05 × (100-a)] } %；
(4) concrete mixer is added by scooping feeding device in slurry Z, while concrete stirring is added in thick, fine aggregate
Machine, by stirring to get ready-mixed concrete；Wherein, the dosage of coarse aggregate and fine aggregate is respectively every cube of concrete: coarse aggregate
Add 1060~1120kg, fine aggregate adds 600~850kg；
In the percentage, a=20~50, b1=(2.2~2.4) %, b2=(2.6~2.8) %；
The cementitious material by clinker, the natural gypsum, admixture B, admixture A tetra- at being grouped as, four ingredients
The sum of mass percent be 100%；The dosage of the cementitious material is every cube of 260~550kg of concrete cementitious material；
The admixture A is identical with the composition of admixture B.
2. a kind of method of wet grinding cement preparation ready-mixed concrete as described in claim 1, it is characterised in that will be natural
Gypsum replaces with desulfurized gypsum, correspondingly, step (1)~step (3) alternative are as follows:
(1) clinker that the percentage for accounting for cementitious material quality is [(100-a) × 0.80] % is subjected to pre- grinding first, in advance
Grinding uses dry method grinding, and clinker partial size is milled to no more than 0.2mm, material M is obtained；
It (2) is (b by the percentage for accounting for cementitious material quality2/b1The desulfurized gypsum of) × 5%, the percentage for accounting for cementitious material quality
Admixture B, water and water-reducing agent for [(100-a) × 0.15] % are mixed evenly, and obtain material N；Wherein, water and water-reducing agent
Additional amount according to every cube of concrete amount of water be 170~175kg, water-reducing agent additional amount be 1.7~8.75kg measured
It is added；
(3) stream ball mill is opened into material M and material N addition, carries out wet grinding, stirring pool is delivered to by shurry pump later
In, admixture A is added, is stirred evenly, slurry Z is obtained；Wherein, the additional amount of admixture A accounts for the percentage of cementitious material quality
Than for { a- [5 × b2/b1- 0.05 × (100-a)] } %.
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| CN110304848B (en) * | 2019-04-11 | 2021-09-07 | 武汉理工大学 | Wet-milling process-based super-cementing material and preparation method and application thereof |
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