CN105563644A - Technology for stirring concrete fed by three times - Google Patents
Technology for stirring concrete fed by three times Download PDFInfo
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- CN105563644A CN105563644A CN201510966584.2A CN201510966584A CN105563644A CN 105563644 A CN105563644 A CN 105563644A CN 201510966584 A CN201510966584 A CN 201510966584A CN 105563644 A CN105563644 A CN 105563644A
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- 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
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Abstract
The invention provides technology for stirring concrete fed by three times. The technology particularly includes: putting fine aggregate, part of water for proportioning and a cementitious material into a stirring pot for stirring to form mortar; putting coarse aggregate and the rest water into transition concrete formed by stirring materials fed in the first time; putting an admixture into the stirring pot; stirring materials fed in the second time to form usable concrete. Compared with concrete prepared by the prior art, the technology has the advantages that under uniformity in strength and workability, consumption of the admixture and cement is reduced; with identical cement gelatinizing material consumption, consumption of the admixture is reduced, workability, strength and durability of prepared concrete are improved effectively.
Description
Technical field
The present invention relates to technical field of concrete production, especially relate to a kind of concrete three stirring techniques that feed intake.
Background technology
Along with the development of Concrete Science And Technology, concrete becomes the indispensable basic material of human society gradually, is the artificial product that application quantity is maximum in the world.And cement is important composition material and the cost chief component of cement concrete, but the cement pollution sources that to be people known, a large amount of dust and pernicious gas can be discharged in production process.
Usual cement concrete feeds intake and stirs is according to match ratio, the cement after metering, admixture, fine aggregate, coarse aggregate, water, additive are mixed in together and mix pot stirring, and this stirring technique can exist following shortcoming:
(1) Binder Materials easily forms little Binder Materials granule after adding water, cause Binder Materials can not abundant aquation, also easily a large amount of bubble is formed between each composition material, become the phenomenon of intensity compared with weak link, have impact on concrete workability, intensity and durability, also add the wearing and tearing of mixing inner lining for cooker plate and blade simultaneously; Water-cement ratio is less, and these situations are more serious.(2) surface of aggregate is due to hydrophily meeting adsorbed water, forms the moisture film that one deck is thicker, forms the clean slurry shell of a high water-cement ratio on the surface of coarse aggregate, and after its sclerosis, space is how not fine and close, lower with the cohesive force of coarse aggregate, becomes the weak floor of concrete strength.Simultaneously when the concreting initial stage is still stream plastic state, wherein heavy thick, fine aggregate can move down because of deadweight, make the less moisture of proportion and bubble move upward simultaneously, after running into rough coarse aggregate, the lower surface being gathered in coarse aggregate is formed hole not of uniform size and water pocket.Make concrete in setting and harden process, form macrovoid at aggregate Interface.Weak floor and macrovoid become the development ground of inside concrete original fracture, destroy concrete homogeneity and globality.(3) be in the concrete of main additive mixing water reducer, concrete workability is mainly adsorbed on cement and mineral admixture particle surface by the high molecular surfactant in water reducer component in additive, form electronegative highfield, mutual repulsion, dispersion, make Binder Materials coagulate body generation dispersion and reach the object meeting workability; And slow down concrete slump loss by slow setting component in additive.Because this stirring technique is with mixing all raw material, one is that moisture in cement mixing mortar can infiltrate in the hole gathered materials fast, the water yield of mixing and stirring in Binder Materials is caused to reduce fast, simultaneously because additive was all dissolved in water before entering mixer, gather materials and absorb how much water, additive is also gathered materials to equal proportion absorption; Two is the absorption additives such as the mineral constituents such as tricalcium aluminate in Binder Materials.Above-mentioned 2 are caused the concentration of additive in Binder Materials to reduce equally fast, rise in additive mutual repulsion, peptizaiton diminishing component and slow down the actual amount that play a role ratio in Binder Materials the corresponding decline of slow setting component in Binder Materials of concrete slump loss, waste the additive that in concrete, unit price cost is high, reduce and the effect of large additive in concrete is affected on workability of concrete, intensity, durability.
Under reaching maintenance even to exceed the prerequisite of current concrete quality, reduce cement consumption can obviously reduce cement concrete material cost, this is the needs of engineering construction development, the needs of China's sustainable development path of preserving the ecological environment especially, ensure.
Summary of the invention
For the problems referred to above, the object of the present invention is to provide a kind of three stirring techniques that feed intake being applicable to concrete-agitating, under the prerequisite of ensuring the quality of products, by changing dosing procedure, utilize Binder Materials to wrap up in sandstone method and backwater mixing applied force method to combine and reach raising concrete performance, reduce the object of cement consumption.
For achieving the above object, the technical solution adopted in the present invention is: in the technical foundation of original concrete-agitating, only adjusts dosing procedure, takes concrete three stirring techniques that feed intake.Concrete operations are as follows:
First time feeds intake stirring: fine aggregate, part proportioning water and Binder Materials drop into mixes pot and stir into mortar;
Feed intake stirring for the second time: coarse aggregate and remaining water drop into the transition concrete stirred into for the first time;
Third time feeds intake stirrings: additive drops into be mixed pot second time and stir rear become and can use concrete.
Described first time feed intake the consumption that adds water in whipping process be 60% ~ 80% proportioning water, second time adds remaining whole proportioning water in feeding intake and stirring.
For mixer produce binder total amount at 150kg/m
3~ 600kg/m
3between to mix with water reducer be the concrete of main component additive, described first time the mixing time that feeds intake get 6 seconds ~ 36 seconds, the second time mixing time that feeds intake gets 12 seconds ~ 72 seconds, third time the mixing time that feeds intake get 12 seconds ~ 72 seconds; Total mixing time that feeds intake for three times gets 30 seconds ~ 180 seconds.
In operation, the stirring that feeds intake of described first time can be subdivided into two steps again: the first step first drops into fine aggregate, part proportioning water to stir, and moistening fine aggregate is surperficial; Second step drops into Binder Materials again and stirs, and stirs into mortar.
The ratio of described three mixings time that feed intake is preferred: first time feeds intake stirs Shi Jian ﹕ second time and feed intake and stir Shi Jian ﹕ third time and to feed intake mixing time=1 ﹕ 2 ﹕ 2.
What above method was applicable to produce mixes take water reducer as the cement concrete of main component additive.Total mixing time that feeds intake for three times and each mixing time should be determined through testing according to mixer agitating mode, mixing effect, Binder Materials amount, total water consumption, additive diminishing and the concrete condition such as retarding effect, concrete slump.
In operation, for making mixing effect better, first time feeds intake and can be subdivided into two steps again: the first step first drops into fine aggregate, part proportioning water to stir, moistening fine aggregate surface; Second step drops into Binder Materials again and stirs, and stirs into mortar.
Cement concrete and other special concretes of exceeding above scope specifically will adjust mixing time according to test situation, but the scope that total mixing time should not exceed 30 seconds ~ 180 seconds.
Operation principle: Binder Materials, fine aggregate and part proportioning water are dropped into and mixes pot and stir into mortar, avoid or reduce the formation of Binder Materials granule, increase the decentralization of Binder Materials, improve degree of hydration in the Binder Materials unit interval, and make Binder Materials be wrapped in fine aggregate surface formation shell; The Binder Materials of polymolecularity starches the clean slurry shell forming a low water binder ratio because of the water suction of coarse aggregate on coarse aggregate surface only, improves after hardening and the cohesive force of coarse aggregate; Input additive stirs, utilize the moisture density of front feed intake for twice inner moisture density and Binder Materials slurry inside close, osmotic pressure is each other close to balance, gather materials the moisture of interior moisture and Binder Materials slurry inside and additive cannot interpenetrate add moisture film that gelling material particles surface is formed weaken tricalcium aluminate and so on etc. mineral constituent to the absorption lagging behind the additive that water adds, raising additive is to the adaptability of the Binder Materials such as cement.
The invention has the beneficial effects as follows: (1) concrete goes out the machine slump and the pumping slump is comparatively stable, the adjustment number of times of workability of concrete can be reduced, effectively improve output; (2) packing and the durability of xoncrete structure can also be improved while ensureing concrete flowability; (3) due in mortar without coarse aggregate, be convenient to mix, after coarse aggregate drops into, easily evenly wrapped up by mortar, decrease the wearing and tearing of coarse aggregate to blade and liner plate, mixer current peak reduces greatly, can economize on electricity, because stir current reduces, stirring vane is compared will alleviate to some extent with the production wearing and tearing of liner plate, can extend the service life of motor, stirring vane and liner plate; (4) can cement 10% ~ 20% be saved under the prerequisite of same intensity grade, save admixture dosage 10% ~ 25%; (5) under the prerequisite of identical cement consumption, 28d the strength of standard curing 20% ~ 30% can be improved than once feeding intake.
Detailed description of the invention
Cement concrete is prepared according to method provided by the present invention.
Embodiment 1
First time feeds intake stirring: fine aggregate, part proportioning water and Binder Materials drop into mixes pot and stir into mortar; Two steps can be subdivided into: the first step first drops into fine aggregate, part proportioning water to stir, moistening fine aggregate surface in concrete operations; Second step drops into Binder Materials again and stirs, and stirs into mortar;
Feed intake stirring for the second time: coarse aggregate and remaining water drop into the transition concrete stirred into for the first time;
Third time feeds intake stirrings: additive drops into be mixed pot second time and stir rear become and can use concrete.
The binder total amount produced for the two shaft pugmill mixer of current normal employing is at 150kg/m
3mixing with diminishing is the cement concrete of main component additive, first time water get the proportioning water of 60%, the remaining whole water of second time; After Binder Materials, fine aggregate and part proportioning water drop into and mixes pot, the mixing time that feeds intake for the first time gets 6 seconds, the mixing time that feeds intake for the second time 12 seconds, for the third time mixing time 12 seconds.
Embodiment 2
First time feeds intake stirring: fine aggregate, part proportioning water and Binder Materials drop into mixes pot and stir into mortar; Two steps can be subdivided into: the first step first drops into fine aggregate, part proportioning water to stir, moistening fine aggregate surface in concrete operations; Second step drops into Binder Materials again and stirs, and stirs into mortar;
Feed intake stirring for the second time: coarse aggregate and remaining water drop into the transition concrete stirred into that feeds intake for the first time;
Third time feeds intake stirrings: additive drops into be mixed pot second time and feed intake to stir and rear become and can use concrete.
The binder total amount produced for the two shaft pugmill mixer of current normal employing is at 500kg/m
3mixing with diminishing is the cement concrete of main component additive, first time water get the proportioning water of 75%, the remaining whole water of second time; After Binder Materials, fine aggregate and part proportioning water drop into and mixes pot, the mixing time that feeds intake for the first time gets 21 seconds, the mixing time that feeds intake for the second time 42 seconds, for the third time mixing time 42 seconds.
Embodiment 3
First time feeds intake stirring: fine aggregate, part proportioning water and Binder Materials drop into mixes pot and stir into mortar; Two steps can be subdivided into: the first step first drops into fine aggregate, part proportioning water to stir, moistening fine aggregate surface in concrete operations; Second step drops into Binder Materials again and stirs, and stirs into mortar;
Feed intake stirring for the second time: coarse aggregate and remaining water drop into the transition concrete stirred into that feeds intake for the first time;
Third time feeds intake stirrings: additive drops into be mixed pot second time and feed intake to stir and rear become and can use concrete.
The binder total amount produced for the two shaft pugmill mixer of current normal employing is at 600kg/m
3mixing with diminishing is the cement concrete of main component additive, first time water get the proportioning water of 80%, the remaining whole water of second time; After Binder Materials, fine aggregate and part proportioning water drop into and mixes pot, the mixing time that feeds intake for the first time gets 36 seconds, the mixing time that feeds intake for the second time 72 seconds, the mixing time that feeds intake for the third time 72 seconds.
By to the detection preparing concrete process and product property in above embodiment, prepared concrete-agitating thing goes out the machine slump and the pumping slump is comparatively stable, when equality strength, go out the machine slump save additive 10% ~ 25%, folk prescription reduces cement consumption 30kg ~ 60kg; Concrete intensity and durability are improved; Due in mortar without coarse aggregate, be convenient to mix, coarse aggregate is easily evenly wrapped up by mortar after dropping into, and decreases the wearing and tearing of coarse aggregate to blade and liner plate; And do not need to increase machinery and human input compared with convention stir technique, do not need to carry out scrap build, there is significant Social benefit and economic benefit.
In practical application, different from coarse aggregate according to selected Binder Materials, fine aggregate, can adjust the amount of water of each step and mixing time, all fall into protection domain involved in the present invention.
Claims (3)
1. concrete three paddling process that feed intake, is characterized in that: specifically comprise the following steps:
First time feeds intake stirring: fine aggregate, part proportioning water and Binder Materials drop into mixes pot and stir into mortar;
Feed intake stirring for the second time: coarse aggregate and remaining water drop into the transition concrete stirred into for the first time;
Third time feeds intake stirrings: additive drops into be mixed pot second time and stir rear become and can use concrete;
Described first time feed intake the consumption that adds water in whipping process be 60% ~ 80% proportioning water, second time adds remaining whole proportioning water in feeding intake and stirring;
Described first time, the mixing time that feeds intake got 6 seconds ~ 36 seconds, and the second time mixing time that feeds intake gets 12 seconds ~ 72 seconds, third time the mixing time that feeds intake get 12 seconds ~ 72 seconds; Total mixing time that feeds intake for three times gets 30 seconds ~ 180 seconds.
2. a kind of concrete according to claim 1 three paddling process that feed intake, is characterized in that, the stirring that feeds intake of described first time can be subdivided into two steps again: the first step first drops into fine aggregate, part proportioning water to stir, and moistening fine aggregate is surperficial; Second step drops into Binder Materials again and stirs, and stirs into mortar.
3. a kind of concrete according to claim 1 three paddling process that feed intake, is characterized in that, the ratio of described three mixings time that feed intake is preferred: first time feeds intake stirs Shi Jian ﹕ second time and feed intake and stir Shi Jian ﹕ third time and to feed intake mixing time=1 ﹕ 2 ﹕ 2.
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| CN201510966584.2A CN105563644A (en) | 2015-12-22 | 2015-12-22 | Technology for stirring concrete fed by three times |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107337393A (en) * | 2017-07-26 | 2017-11-10 | 湖南东方红建设集团有限公司 | The stirring means and match ratio of self-compaction fibre reinforced concrete |
| CN107972183A (en) * | 2017-11-27 | 2018-05-01 | 中国二冶集团有限公司 | Mixer feeds intake the control method of stirring |
| CN108439916A (en) * | 2018-05-18 | 2018-08-24 | 嘉兴盛装透水路面材料科技有限公司 | The preparation method of pervious concrete is factory produced |
| CN110577390A (en) * | 2019-10-25 | 2019-12-17 | 四川信敏绿色新建筑材料科技有限公司 | Concrete preparation process |
| CN114227915A (en) * | 2021-12-31 | 2022-03-25 | 许昌德通振动搅拌科技股份有限公司 | Compound step-by-step concrete stirring process |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107337393A (en) * | 2017-07-26 | 2017-11-10 | 湖南东方红建设集团有限公司 | The stirring means and match ratio of self-compaction fibre reinforced concrete |
| CN107337393B (en) * | 2017-07-26 | 2020-05-26 | 湖南东方红建设集团有限公司 | Self-compacting fiber reinforced concrete and stirring method thereof |
| CN107972183A (en) * | 2017-11-27 | 2018-05-01 | 中国二冶集团有限公司 | Mixer feeds intake the control method of stirring |
| CN108439916A (en) * | 2018-05-18 | 2018-08-24 | 嘉兴盛装透水路面材料科技有限公司 | The preparation method of pervious concrete is factory produced |
| CN110577390A (en) * | 2019-10-25 | 2019-12-17 | 四川信敏绿色新建筑材料科技有限公司 | Concrete preparation process |
| CN110577390B (en) * | 2019-10-25 | 2022-01-18 | 四川信敏绿色新建筑材料科技有限公司 | Concrete preparation process |
| CN114227915A (en) * | 2021-12-31 | 2022-03-25 | 许昌德通振动搅拌科技股份有限公司 | Compound step-by-step concrete stirring process |
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Application publication date: 20160511 |
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