CN106032314A - Concrete and preparation method thereof - Google Patents
Concrete and preparation method thereof Download PDFInfo
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- CN106032314A CN106032314A CN201510126160.5A CN201510126160A CN106032314A CN 106032314 A CN106032314 A CN 106032314A CN 201510126160 A CN201510126160 A CN 201510126160A CN 106032314 A CN106032314 A CN 106032314A
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- concrete
- aggregate
- flyash
- weight
- cementitious matter
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- 239000004567 concrete Substances 0.000 title claims abstract description 77
- 238000002360 preparation method Methods 0.000 title claims abstract description 8
- 239000010881 fly ash Substances 0.000 claims abstract description 33
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 24
- 239000002245 particle Substances 0.000 claims abstract description 18
- 239000004568 cement Substances 0.000 claims abstract description 10
- 238000002156 mixing Methods 0.000 claims abstract description 10
- 239000000463 material Substances 0.000 claims abstract description 8
- 239000000203 mixture Substances 0.000 claims abstract description 8
- 150000001875 compounds Chemical class 0.000 claims description 21
- 239000003638 chemical reducing agent Substances 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 10
- 238000012360 testing method Methods 0.000 claims description 5
- 239000010883 coal ash Substances 0.000 claims description 4
- 229920006395 saturated elastomer Polymers 0.000 claims description 4
- 239000011398 Portland cement Substances 0.000 claims description 3
- 235000013312 flour Nutrition 0.000 claims description 2
- 239000003292 glue Substances 0.000 claims description 2
- 239000002893 slag Substances 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 6
- 239000011376 self-consolidating concrete Substances 0.000 abstract description 5
- 239000004566 building material Substances 0.000 abstract description 2
- 230000009286 beneficial effect Effects 0.000 abstract 1
- 229910052500 inorganic mineral Inorganic materials 0.000 abstract 1
- 239000011707 mineral Substances 0.000 abstract 1
- 239000000843 powder Substances 0.000 abstract 1
- 239000004576 sand Substances 0.000 description 5
- 238000010276 construction Methods 0.000 description 4
- 238000011161 development Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000011049 filling Methods 0.000 description 3
- 239000004575 stone Substances 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 239000000654 additive Substances 0.000 description 2
- 230000000996 additive effect Effects 0.000 description 2
- 239000002956 ash Substances 0.000 description 2
- 230000000740 bleeding effect Effects 0.000 description 2
- 235000012215 calcium aluminium silicate Nutrition 0.000 description 2
- 230000008094 contradictory effect Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000007667 floating Methods 0.000 description 2
- 239000008187 granular material Substances 0.000 description 2
- 238000002955 isolation Methods 0.000 description 2
- 229920005646 polycarboxylate Polymers 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- -1 breeze Substances 0.000 description 1
- 239000000404 calcium aluminium silicate Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000004574 high-performance concrete Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000004570 mortar (masonry) Substances 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 239000008188 pellet Substances 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 239000011800 void material Substances 0.000 description 1
Classifications
-
- 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
Landscapes
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention relates to the field of building materials, and discloses concrete which comprises a cementing material and a continuous graded mixture bonded with each other through the cementing material, wherein the continuous graded mixture comprises a fine aggregate and a coarse aggregate, and the cementing material comprises the following components in a weight ratio of 1: (0.3-1.5): (0.5-1.5) cement, fly ash and mineral powder, wherein the weight ratio of the fine aggregate to the coarse aggregate is 1: (0.8-1.3), and the particle size of the coarse aggregate is less than or equal to 25 mm. The invention also discloses a preparation method of the concrete, which comprises the step of mixing the cementing material, the continuous grading mixture and water. The invention can prepare the concrete with the self-compacting concrete fluidity effect by adopting the continuous gradation mixture and using the cementing material amount of the common concrete, thereby completely getting rid of the contradiction of high fluidity and high cost, leading the fluidized concrete to be widely popularized and being beneficial to improving various performances of concrete buildings.
Description
Technical field
The present invention relates to building material field, in particular it relates to a kind of concrete and preparation method thereof.
Background technology
Along with the development of society, commerical ready-mixed concrete serves significant role in the development of the national economy, and the quality of concrete is not only whether intensity meets requirement, and first needing the condition met is that it should have good workability.The concrete of Workable is not only convenient for construction, and can avoid the similar defects of concrete structure such as honeycomb, layering.The workability of concrete is main and filling between grading of aggregates, raw material, working volume, additive usage etc. are closely bound up.The raising required in the face of concrete performance along with city, following high performance concrete will become market development main flow, the liquidation concrete under the lowest glue.
For general goods concrete, its mix-design mainly uses empirical value, and the single aggregate that coarse aggregate uses maximum particle diameter to be 31.5mm mostly, grading of aggregates is poor and non-adjustable.Workability of concrete relies primarily on mixes additive or water ensures more, and concrete strength ensures mainly by multiplex cement, and breeze, the volume of flyash mainly use empirical value to determine.The slump that need to pump, at 18 ± 2cm, poor fluidity, needs vibrating head to coordinate when pouring.Rely on to increase water consumption or increase admixture dosage and change slump; can cause concrete that damage situation of collapsing easily occurs; therefore; after the agitated transport vehicle of concrete is transported to building site; building site workman would generally add water to concrete for ease of construction, although workability can obtain a certain degree of improvement, but now increases due to the ratio of mud; the intensity of concrete reduces, and causes concrete component severe safety problem easily occur.
For self-compacting concrete (SCC), it relies primarily on the total amount total cementitious matter of 255kg/t aggregate (minimum be) increasing cementitious matter, the particle diameter reducing coarse aggregate is 5-15mm or 5-25mm, concrete is made to obtain more working volume, the feature of high fluidity is reached with this, but its cost is typically the highest, and it is mostly only applied in the concrete structure engineering that the concrete of high intensity and being difficult to is poured into a mould.
In other words, existing normal concrete is limited to mixing proportion design method, causes aggregate discontinuous, and inside concrete filling effect is poor, and workability is poor, and concrete structure the faults of construction such as honeycomb easily occurs after pouring.And self-compacting concrete just can make concrete obtain preferable mobility owing to need to increase cementitious matter consumption, therefore its cost of raw material is higher, and economy is poor.
Summary of the invention
It is an object of the invention to: overcome that the workability of concrete in prior art is the highest, the defect of cementitious matter large usage quantity, it is provided that liquidation concrete that a kind of cementitious matter consumption is low, workability is good and preparation method thereof.
The present inventor finds under study for action, specific continuous grading compound and cementitious matter is mixed with concrete and can realize improving the purpose of liquidation concrete performance in the case of cementing doses is relatively low.Therefore, to achieve these goals, the invention provides a kind of concrete, this concrete contains cementitious matter and by described cementitious matter continuous grading compound bonded to each other, described continuous grading compound includes fine aggregate and coarse aggregate, wherein, it is 1:(0.3-1.5 that described cementitious matter contains weight ratio): the cement of (0.5-1.5), flyash and breeze, described fine aggregate is 1:(0.8-1.3 with the weight ratio of coarse aggregate), the particle diameter≤25mm of described coarse aggregate.
Present invention also offers the preparation method of above-mentioned concrete, the method includes mixing cementitious matter, continuous grading compound and water.
The present invention is by using continuous grading compound (preferably 2 sand 2 stones of specified particle diameter), the cementing doses (200-240kg/t aggregate) using normal concrete can make the concrete (liquidation concrete) with self-compacting concrete mobility effect, therefore high fluidity high cost (high cementing doses) this contradictory problems it has been completely free of, enable liquidation concrete to be widely popularized, contribute to promoting the properties of concrete structure.The concrete of the present invention is the liquidation concrete of low cementitious matter, and its divergence is between 55-65cm, and intensity can reach C30-C60, does not haves the phenomenons such as isolation, bleeding and floating ash, has easily construction, the feature (workability is good) of good economy performance.
Other features and advantages of the present invention will be described in detail in detailed description of the invention part subsequently.
Detailed description of the invention
Hereinafter the detailed description of the invention of the present invention is described in detail.It should be appreciated that detailed description of the invention described herein is merely to illustrate and explains the present invention, it is not limited to the present invention.
In the present invention, in the case of illustrating on the contrary, when continuous grading refers to, with the standard screen of a set of regulations screen size, a certain aggregate is carried out mesh analysis, obtained grading curve is a smooth curve, has continuous lines, has certain proportionate relationship between the pellet of adjacent grade, this descending, each grade granule all has, and the mixing aggregate that example collocation forms in mass ratio, is referred to as " continuous grading compound "；Coarse aggregate (being also called " stone ") refers to that particle diameter is more than the aggregate of 5mm；Fine aggregate (being also called " sand ") refers to particle diameter aggregate between 0.05-5mm；" saturated weight is done in face " i.e. S.S.D weight, the weight representing that aggregate internal void is aqueous when reaching saturated and its dry tack free；In the present invention, (such as aforementioned S.S.D weight) in the case of illustrating, the weight related to refers both to the butt weight of material, the i.e. water-free weight of material.
The concrete that the present invention provides contains cementitious matter and by described cementitious matter continuous grading compound (aggregate) bonded to each other, described continuous grading compound includes fine aggregate and coarse aggregate, it is 1:(0.3-1.5 that described cementitious matter contains weight ratio): the cement of (0.5-1.5), flyash and breeze (described flyash is identical or different with the consumption of breeze), described fine aggregate is 1:(0.8-1.3 with the weight ratio of coarse aggregate) (preferably 1:(0.9-1)), the particle diameter≤25mm of described coarse aggregate.
Liquidation concrete under low cementitious matter is made into continuous state by a certain proportion of stone, the sand aggregate blending technology test total level of aggregate, and doping quantity of fly ash makes inside concrete fill enough to utilize the filling relation between inside concrete to determine according to preferred implementation, the total cementing doses finally using normal concrete makes the concrete with self-compacting concrete mobility effect, therefore this contradictory problems of high fluidity high cost it has been completely free of, enable liquidation concrete to be widely popularized, promote the properties of concrete structure.
A preferred embodiment of the invention, on the basis of the gross weight of described fine aggregate, in described fine aggregate, the content of the aggregate that particle diameter is less than or equal to 3mm more than 0.075mm is 65-75wt.% (percentage by weight), and particle diameter is 25-35wt.% more than the content of the aggregate that 3mm is less than or equal to 5mm.
In order to obtain more preferably working volume, the ratio between S.S.D weight and the weight of flyash of described fine aggregate is 9-16.
A preferred embodiment of the invention, on the basis of the gross weight of described coarse aggregate, in described coarse aggregate, the content of the aggregate that particle diameter is less than or equal to 12.5mm more than 5mm is 25-35wt.%, and particle diameter is 65-75wt.% more than the content of the aggregate that 12.5mm is less than or equal to 25mm.
Using the content of different-grain diameter aggregate in above-mentioned preferred implementation regulation and control coarse aggregate and fine aggregate that grading of aggregates can be made further to present continuous grading state, the grading curve obtained is more close, so that the performance of concrete is more preferably with preferable Fu Leshi curve.
In the present invention, described cement, flyash and breeze can be the conventional selection of this area.But, described cement is preferably the Portland cement of PO42.5.
Flyash is preferably (steam power plant produces) grade flyash (such as second class powered coal ash or first level flour coal ash) more than two grades.Flyash is the particle matter that coal-burning power plant obtains, and is mainly made up of calcium aluminium silicate (calcium aluminosilicates), and bulk density is usually 0.5-1.5g/cm3。
Breeze is preferably grade granulated blast-furnace slag more than S95 level.
In the present invention, by with the use of specific cementitious matter and aggregate, the consumption of described cementitious matter can be reduced largely.Therefore, in a preferred embodiment of the invention, relative to continuous grading compound per ton, the consumption of described cementitious matter is 200-240kg.
In the present invention, described concrete can also contain water reducer.Consumption not particularly requirement to described water reducer, under preferable case, relative to continuous grading compound per ton, the consumption of described water reducer is 3.5-4kg.Described water reducer can be polycarboxylate water-reducer (being typically formulated as the solution that solid content is 10-30wt.% during use) commonly used in the art, and can be commercially available, is not described in detail in this.
The content of the coagulation soil water of the present invention can be customary amount, and such as, relative to continuous grading compound per ton, the consumption of water is generally 90-100kg.
The method preparing described concrete that the present invention provides includes mixing cementitious matter, continuous grading compound and water.Wherein, cementitious matter and the kind of continuous grading compound and consumption be not as it was previously stated, repeat them here.
Described mixing can be carried out in the way of using routine, for example, it is possible to by blender.According to the preferred embodiment of the present invention, by the mode that cementitious matter, continuous grading compound and water mix it is: cementitious matter, fine aggregate and water are first mixed by (1), and the mixture of acquisition is mixed with coarse aggregate by (2) again.If use water reducer, water reducer preferably mixes in step (1).
The granule of flyash is ball-type, and it adds the liquidation to concrete is helpful.The cementing properties of conventional flyash is the lowest, and only has an impact the later strength of concrete.The present inventor finds under study for action, and the Unit Weight (tight packing density) of flyash and fine aggregate is the biggest, and the mobility of concrete is the best.In order to obtain more preferably working volume, the consumption of flyash can be determined according to fine aggregate.Therefore, in a preferred embodiment of the invention, flyash Unit Weight mixed with fine aggregate U represents, weight F of flyash represents, S.S.D weight Wa of fine aggregate represents, adding rate F% of flyash represents and F%=F/ (F+Wa), and the method also includes using unit weight to test the relation determining between U and F%, and set up conic section regression equation, so that it is determined that the adding rate of optimal flyash.Wherein, the concrete operations of described unit weight experiment can be found in GB/T14685-2001.
In the present invention, the consumption of water is had no particular limits, can be conventional amount used.Such as, relative to continuous grading compound per ton, the consumption of water can be 90-100kg.
The present invention will be described in more detail by the following examples, but the present invention is not limited to these embodiments.
In following example, the interpolation method for determination of amount of flyash is following (as a example by embodiment 1):
Flyash Unit Weight mixed with fine aggregate U represents, weight F of flyash represents, S.S.D weight Wa of fine aggregate represents, adding rate F% of flyash represents and F%=F/ (F+Wa).Determine the relation between U (y) and F% (x) according to unit weight test (seeing standard GB/T14685-2001), and set up conic section regression equation " y=-5843.2x2+ 946.78x+4760.9, R2=0.9251 ", such that it is able to be calculated, during x=8%, y will take maximum, thus can determine the consumption (F) of flyash further according to the S.S.D weight of fine aggregate.
Embodiment 1-4
Cement is the Portland cement of PO42.5, and its technical parameter meets GB175-2007；Flyash is two grades；Breeze is S95 level, its 7 days activity >=75%, 28 days activity >=95%；The selection of aggregate is as shown in table 1 below.
Preparation process is: first by fine aggregate (fine sand and coarse sand), cement, breeze, flyash, water, polycarboxylate water-reducer, (water-reducing rate is 25%, purchased from Shanghai Sanrui Chemistry Co., Ltd, the solution that solid content is 12wt.% it is configured to during use) put into the interior stirring of blender 45 seconds, form mortar, coarse aggregate (gravelstone and great Shi) is cast discharging after stirring 15 seconds the most again, obtains concrete.
Reference standard GB/T50080-2002, measures the divergence of concrete with slump bucket.
Use die trial to make concrete test block, and fog room maintenance 28 days, surveying its intensity should be the most qualified at more than 46MPa.Concrete strength is tested according to GB/T 50081-2002 standard for test methods of mechanical properties of ordinary concrete.
Table 1
As can be seen from the above embodiments, the concrete divergence of the present invention is between 55-65cm, and intensity can reach C30-C60, does not haves the phenomenons such as isolation, bleeding and floating ash.
The preferred embodiment of the present invention described in detail above; but, the present invention is not limited to the detail in above-mentioned embodiment, in the technology concept of the present invention; technical scheme can be carried out multiple simple variant, these simple variant belong to protection scope of the present invention.
It is further to note that, each concrete technical characteristic described in above-mentioned detailed description of the invention, in the case of reconcilable, can be combined by any suitable means, in order to avoid unnecessary repetition, various possible compound modes are illustrated by the present invention the most separately.
Additionally, can also carry out combination in any between the various different embodiment of the present invention, as long as it is without prejudice to the thought of the present invention, it should be considered as content disclosed in this invention equally.
Claims (10)
1. a concrete, this concrete contains cementitious matter and passes through the company that described cementitious matter is bonded to each other
Continuous graded mixture, described continuous grading compound includes fine aggregate and coarse aggregate, it is characterised in that institute
Stating cementitious matter and containing weight ratio is the cement of 1:0.3-1.5:0.5-1.5, flyash and breeze, described carefully
Aggregate is 1:0.8-1.3 with the weight ratio of coarse aggregate, the particle diameter≤25mm of described coarse aggregate.
Concrete the most according to claim 1, wherein, on the basis of the gross weight of described fine aggregate,
In described fine aggregate, the content of the aggregate that particle diameter is less than or equal to 3mm more than 0.075mm is
65-75wt.%, particle diameter is 25-35wt.% more than the content of the aggregate that 3mm is less than or equal to 5mm.
Concrete the most according to claim 1, wherein, the face of described fine aggregate do saturated weight with
Ratio between the weight of flyash is 9-16.
4. according to the concrete described in any one in claim 1-3, wherein, with described coarse aggregate
On the basis of gross weight, in described coarse aggregate, particle diameter is less than or equal to containing of the aggregate of 12.5mm more than 5mm
Amount is 25-35wt.%, and particle diameter more than the content of the aggregate that 12.5mm is less than or equal to 25mm is
65-75wt.%.
5. according to the concrete described in any one in claim 1-3, wherein, described cement is
The Portland cement of PO42.5；Flyash is second class powered coal ash or first level flour coal ash；Breeze is S95
The granulated blast-furnace slag that level is above.
Concrete the most according to claim 1, wherein, relative to continuous grading compound per ton,
The consumption of described cementitious matter is 200-240kg.
Concrete the most according to claim 1, wherein, described concrete is possibly together with water reducer；Phase
For continuous grading compound per ton, the consumption of described water reducer is 3.5-4kg.
8. the method for concrete described in any one in preparation claim 1-7, the method includes glue
Ramming material, continuous grading compound and water mixing.
Method the most according to claim 8, wherein, by cementitious matter, continuous grading compound and water
The mode of mixing is: first cementitious matter, fine aggregate and water are mixed, then by the mixture obtained and coarse aggregate
Mixing.
The most according to claim 8 or claim 9, method, wherein, flyash is mixed with fine aggregate
Unit Weight U represents, weight F of flyash represents, saturated weight Wa is done in the face of fine aggregate
Representing, adding rate F% of flyash represents and F%=F/ (F+Wa), and the method also includes using list
Position retries the relation determining between U and F% of testing, and sets up conic section regression equation, so that it is determined that
The adding rate of good flyash.
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| CN106032314B CN106032314B (en) | 2018-09-21 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114835455A (en) * | 2022-05-30 | 2022-08-02 | 中建西部建设北方有限公司 | Low-carbon concrete and cementing material |
| CN117510147A (en) * | 2023-11-02 | 2024-02-06 | 国网新源集团有限公司 | Cement-based material prepared by exciting fly ash with nano seed crystal and method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114835455A (en) * | 2022-05-30 | 2022-08-02 | 中建西部建设北方有限公司 | Low-carbon concrete and cementing material |
| CN117510147A (en) * | 2023-11-02 | 2024-02-06 | 国网新源集团有限公司 | Cement-based material prepared by exciting fly ash with nano seed crystal and method |
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