CN1792978A - Machine-made sand self-compacting concrete - Google Patents
Machine-made sand self-compacting concrete Download PDFInfo
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- CN1792978A CN1792978A CNA2005102007769A CN200510200776A CN1792978A CN 1792978 A CN1792978 A CN 1792978A CN A2005102007769 A CNA2005102007769 A CN A2005102007769A CN 200510200776 A CN200510200776 A CN 200510200776A CN 1792978 A CN1792978 A CN 1792978A
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- machine
- compacting concrete
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00034—Physico-chemical characteristics of the mixtures
- C04B2111/00103—Self-compacting mixtures
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
A self-compacting concrete with high affinity, strength and durability is proportionally prepared from cement, powdered coal ash, wollastonite, other mineral additives, polycarboxylic acid type water-reducing agent, viscosity increaser, defoaming agent, mechanically prepared sand and broken stone.
Description
Technical field:
The present invention relates to a kind ofly to be used to build, the self-compacting concrete of engineering such as water conservancy, water conservancy project, tunnel, belong to the concrete technology field.
Background technology:
Concrete is the most large human building structural materials.Along with the modern project structure develops and the needs of severe environmental conditions to large span, towering, heavily loaded direction, high-strength high-performance concrete be widely used in Highrise buildings, bridge, ocean, harbour, inferior engineering.Self-compacting concrete is as a kind of novel high-performance concrete, its fresh concrete is because of having very good operation, concrete fillibility, density, homogeneity are significantly improved, can under deadweight, need not to vibrate and the space of filling template voluntarily, form concrete structure uniformly densely, thus be widely used in being suitable for the amount of building big, build the degree of depth dark or build highly big, reinforcing bar is intensive, have in the concrete works of special shape etc.At present, self-compacting concrete has become an important research direction of high performance concrete.Self-compacting concrete is a new concrete technology of closely at first being researched and developed by Japan during the last ten years and using in engineering.In recent years, a large amount of research and application have also been carried out in succession in this respect as countries such as the U.S., Europe in countries in the world.Domestic after nineteen ninety-five has been succeeded in developing self-compact concrete by Structural Member Plant, Beijing Urban Construction Group Corp, the development research and obtain certain success in succession of existing how tame unit.
At present, self-compacting concrete all adopts river sand formulated, and river sand is natural resources, and along with the continuous increase of China's concrete amount, this year, China's concrete amount reaches 2 billion cubic meters.Therefore, exploitation river sand equivalent material promotes that to saving natural resources social sustainable development is significant.
Mechanism sand is a kind of available stock, can utilize its alternative river sand.Application system sand in concrete can improve and alleviate and ruin a series of environmental problems of digging sand in the field, reduces the production cost and the market building sand price of commerical ready-mixed concrete, improves construction engineering quality, reduces the pressure of building sand anxiety.Save resource, reduce cost, the protection environment.
But bad because of the grain composition of machine-processed sand, in the middle of size distribution often shows as less, two is many, machine-processed sand particle is coarse, the content of stone powder height, therefore often easily cause fresh concrete coherency, poor water retention property, easy segregation, bleeding, and reduced workability and flowability.
Summary of the invention:
The objective of the invention is: provide the machine-processed sand of a kind of employing to substitute river sand, also make a kind of high workability, high cohesion, low slump loss, high competent self-compacting concrete with a large amount of trade wastes, settlement mechanism sand is prepared the existing problem of self-compacting concrete simultaneously, to overcome the deficiencies in the prior art.
To achieve these goals, by a large amount of experiments, research and summary, continue to optimize proportioning, the present invention adopts polycarboxylate water-reducer and the compound use of tackifier with high water reducing rate, high water conservation, shortcomings such as the settlement mechanism sand self-compacting concrete is easily emanated, bleeding; Adopt complex mineral blending materials such as flyash and silicon ash, stone flour, improve the workability of self-compacting concrete and the intensity and the weather resistance of self-compacting concrete.
Concrete technical scheme of the present invention is achieved in that according to components by weight percent and calculates that machine-made sand self-compacting concrete of the present invention is made up of 100 parts of cement, 60～100 parts in flyash, 5～20 parts of silicon ashes, 1～40 part of other mineral admixture, 1～5 part of polycarboxylate water-reducer, 0.001～0.08 part of tackifier, 0.001～0.1 part of defoamer, 280～360 parts in machine-processed sand, 280～360 parts of mixing of rubble.
Described cement is silicate cement or ordinary Portland cement, but its intensity is not less than 42.5 strength grades.
Described flyash is high calcium ash or common ash, should be second class powered coal ash or first level flour coal ash.
Described silicon ash can be condensed state silicon ash or ordinary silicon ash, and specific surface area is greater than 19000cm
2/ g.
Described other mineral admixtures are limestone powder or levigate blast furnace slag powder, and fineness is 100 orders or following.
Described polycarboxylate water-reducer should be the polycarboxylate water-reducer with high diminishing, water conservation, and solid content should be greater than 20%.
Described tackifier can be selected cellulose-based tackifier for use, comprise hydroxyethylmethyl-cellulose ether, hydroxypropyl methyl cellulose ether, and its viscosity should be controlled between 2.5 ten thousand to 40,000.
Described defoamer can be selected polyethers or silicone based defoamer for use.
Described machine-processed sand should be greater than 5.0mm with less than the 0.08mm particle, the content of stone powder in its machine-processed sand be controlled at machine-processed sand total amount greater than 5%, be less than or equal to 10%, its silt content is less than 1%.
Described rubble maximum particle diameter is 25mm, and preferred maximum particle diameter is 20mm, and stone can be continuous grading or gap grading, and faller gill shape content should be less than 5% of rubble total amount in the rubble, and silt content is less than 1%.
The present invention compared with prior art has following particular performances and advantage:
(1) adopt polycarboxylate water-reducer with high water reducing rate, high water conservation, and with the compound use of tackifier, solved well that machine-made sand self-compacting concrete is easily emanated, bleeding, shortcomings such as coherency, poor water retention property.
(2) adopt big volume composite blend technology, made full use of trade waste.Adopt complex mineral blending materials such as flyash and silicon ash, stone flour, total volume not only improves the workability of self-compacting concrete greatly, and has improved the intensity and the weather resistance of self-compacting concrete greater than 40% of binder total amount.
(3) adopt machine-processed sand to substitute river sand commonly used and make high performance self-compacting concrete, be not only the innovation on the concrete technology, and can improve recycle effectively to trade waste, and meet the strategy of sustainable development, also have important pushing effect to improving urban ecological environment.The enforcement of this technology not only can produce great economic benefit, and has high social.
Embodiment:
Embodiments of the invention: when making machine-made sand self-compacting concrete of the present invention, get 100 kilograms cement, the flyash that adds 60～100 kilograms again, 5～20 kilograms silicon ash, 1～40 kilogram ground slag powder, 1～5 kilogram polycarboxylate water-reducer, 0.001～0.08 kilogram tackifier, 0.001～0.1 kilogram defoamer, 280～360 kilograms machine-processed sand and 280～360 kilograms rubble can make machine-made sand self-compacting concrete of the present invention after mixing.In the used raw material of present embodiment: the strength grade that its cement selects for use the cement mill, Guizhou to produce is 42.5 ordinary Portland cement; The second class powered coal ash that flyash selects for use the power station, Guizhou to produce; The silicon ash that the silicon ash selects for use Guizhou ferroalloy works to produce, specific surface area is 19600cm
2/ g; The S95 ground slag powder that slag powders selects for use Hypon field building materials company limited to produce, fineness is 100 orders or following; Polycarboxylate water-reducer is selected for use: wash in a pan the retardation setting type superplasticizer SR3 that positive chemical industry (Shanghai) Co., Ltd. produces, its main ingredient is grafting sulfonate polycarboxylate component, solid content is 24%, or wash in a pan the early-strength type superplasticizer SP1 that positive chemical industry (Shanghai) Co., Ltd. produces, main ingredient is a polyether component, and solid content is 29%, or polycarboxylate water-reducer V500, the V3320 of the production of west card material of construction company limited, main ingredient is polymethacrylic acid polymer, and solid content is respectively 20%, 25%.
When use is of the present invention, only needing to add suitable water gets final product, its amount of water should be controlled by the gelling material amount of being made up of cement, flyash, silicon ash among the present invention, under general service condition the ratio (that is: water-cement ratio) of water and gelling material is controlled in 0.25～0.5 the scope.
Below table 1 be the slump, slump divergence and the elution time of falling the slump cone performance table of the machine-made sand self-compacting concrete of the present invention when mixing different varieties polycarboxylate water-reducer (ratio of its volume and tackifier volume is meant the ratio that accounts for gel material content):
Table 1 is mixed the machine-made sand self-compacting concrete performance of different varieties water reducer
| Water reducer | The tackifier volume, ‰ | The slump (cm) | Slump divergence (cm) | The elution time of falling the slump cone (s) | |||||||
| Kind | Volume (%) | 0h | 1h | 2h | 0h | 1h | 2h | 0h | 1h | 2h | |
| SR3 | 1.6 | 0.1 | 24 | 23.5 | 20.5 | 61 | 56 | 42 | 12 | 14.1 | 18 |
| SP1 | 1.4 | 0.2 | 23.5 | 22 | 21.5 | 63 | 58 | 55 | 10.1 | 13.1 | 13.5 |
| V500 | 2.0 | 0.5 | 25.5 | 23.5 | 23.5 | 65 | 66 | 64 | 7.3 | 7.7 | 10 |
| V3320 | 1.5 | 2 | 23.5 | 22 | 20 | 60 | 56 | 50 | 21 | 27.6 | 31.4 |
Below the machine-made sand self-compacting concrete pressure resistance kilsyth basalt in table 2 different length of times that are the present invention when mixing the different varieties polycarboxylate water-reducer:
The machine-made sand self-compacting concrete ultimate compression strength in table 2 different length of times
| Water reducer | Ultimate compression strength (MPa) | ||
| Kind | 3d | 7d | 28d |
| SR3 | 18.9 | 36.5 | 55.3 |
| SP1 | 21.9 | 38.5 | 60.3 |
| V500 | 20.5 | 28.5 | 51.6 |
| V3320 | 20.5 | 36.7 | 54.7 |
By table 1 and table 2 as seen, use four kinds of different polycarboxylate water-reducers, selecting under the suitable volume, optimize self-compacting concrete proportioning parameter, the machine-made sand self-compacting concrete of preparation all has good workability and mechanical property.
Below table 3 be the slump, slump divergence and the elution time of falling the slump cone performance table of the machine-made sand self-compacting concrete of the present invention when mixing the gelling material of being formed by cement, flyash, silicon ash of different amounts and tackifier (ratio of its volume is meant the ratio that accounts for gel material content):
Machine-made sand self-compacting concrete mixture performance under the different gel material contents of table 3
| Gel material content (kg/m 3) | The tackifier volume, ‰ | The slump (cm) | Slump divergence (cm) | The elution time of falling the slump cone (s) | ||||||
| 0h | 1h | 2h | 0h | 1h | 2h | 0h | 1h | 2h | ||
| 450 | 0.2 | 23.5 | 23 | 21 | 65 | 63 | 51 | 14.3 | 16 | 19.1 |
| 0.3 | 22 | 21.5 | 20.5 | 62 | 58 | 46.5 | 15.3 | 18 | 35.5 | |
| 500 | 0 | 22 | 20.5 | 19 | 68 | 58 | 53 | 14.8 | 16.4 | 19.5 |
| 0.1 | 25 | 24.5 | 23 | 68 | 62 | 53.5 | 8.8 | 10.6 | 23.7 | |
| 550 | 0.05 | 25.5 | 25.5 | 23 | 69 | 67.5 | 60 | 5 | 5.6 | 8.5 |
| 0.1 | 24.5 | 24 | 22 | 68 | 67 | 62 | 6.6 | 8 | 15 | |
Below table 4 are pressure resistance kilsyth basalts that the present invention mixes the machine-made sand self-compacting concrete under the different gel material contents:
The ultimate compression strength of the machine-made sand self-compacting concrete under the different gel material contents of table 4
| Gel material content (kg/m 3) | Ultimate compression strength (MPa) | ||
| 3d | 7d | 28d | |
| 450 | 15.7 | 33.9 | 54.3 |
| 500 | 21.9 | 37.7 | 61.3 |
| 550 | 17.1 | 33.2 | 55.8 |
By table 3 and table 4 as seen, along with the increase of gel material content, machine-made sand self-compacting concrete mixture performance is good more, and concrete slump and slump divergence all reach very ideal value, and the elution time of falling the slump cone is also smaller.Under the high gel material content, the autodensing concrete almixture performance is good more.Under different gel material contents and optimization proportioning parameter, all can make high performance machine-made sand self-compacting concrete.
Claims (10)
1. machine-made sand self-compacting concrete, it is characterized in that: calculate according to components by weight percent, it is made up of 100 parts of cement, 60～100 parts in flyash, 5～20 parts of silicon ashes, 1～40 part of other mineral admixture, 1～5 part of polycarboxylate water-reducer, 0.001～0.08 part of tackifier, 0.001～0.1 part of defoamer, 280～360 parts in machine-processed sand, 280～360 parts of mixing of rubble.
2. a kind of machine-made sand self-compacting concrete according to claim 1 is characterized in that: described cement is silicate cement or ordinary Portland cement, but its intensity is not less than 42.5 strength grades.
3. a kind of machine-made sand self-compacting concrete according to claim 1 is characterized in that: described flyash is high calcium ash or common ash, should be second class powered coal ash or first level flour coal ash.
4. a kind of machine-made sand self-compacting concrete according to claim 1 is characterized in that: described silicon ash can be condensed state silicon ash or ordinary silicon ash, and specific surface area is greater than 19000cm2/g.
5. a kind of machine-made sand self-compacting concrete according to claim 1 is characterized in that: described other mineral admixtures are limestone powder or levigate blast furnace slag powder, and fineness is 100 orders or following.
6. a kind of machine-made sand self-compacting concrete according to claim 1 is characterized in that: described polycarboxylate water-reducer should be the polycarboxylate water-reducer with high diminishing, water conservation, and solid content should be greater than 20%.
7. a kind of machine-made sand self-compacting concrete according to claim 1, it is characterized in that: described tackifier can be selected cellulose-based tackifier for use, comprise hydroxyethylmethyl-cellulose ether, hydroxypropyl methyl cellulose ether, its viscosity should be controlled between 2.5 ten thousand to 40,000.
8. a kind of machine-made sand self-compacting concrete according to claim 1 is characterized in that: described defoamer can be selected polyethers or silicone based defoamer for use.
9. a kind of machine-made sand self-compacting concrete according to claim 1, it is characterized in that: described machine-processed sand should be greater than 5.0mm with less than the 0.08mm particle, content of stone powder in its machine-processed sand be controlled at machine-processed sand total amount greater than 5%, be less than or equal to 10% scope, its silt content is less than 1%.
10. a kind of machine-made sand self-compacting concrete according to claim 1, it is characterized in that: described rubble maximum particle diameter is 25mm, preferred maximum particle diameter is 20mm, stone can be continuous grading or gap grading, faller gill shape content should be less than 5% of rubble total amount in the rubble, and its silt content is less than 1%.
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