CN106278036B - A kind of High-strength self-compaction concrete and preparation method - Google Patents
A kind of High-strength self-compaction concrete and preparation method Download PDFInfo
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- CN106278036B CN106278036B CN201610663817.6A CN201610663817A CN106278036B CN 106278036 B CN106278036 B CN 106278036B CN 201610663817 A CN201610663817 A CN 201610663817A CN 106278036 B CN106278036 B CN 106278036B
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Classifications
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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
- 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
- C04B28/02—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 hydraulic cements other than calcium sulfates
- C04B28/04—Portland 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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/20—Resistance against chemical, physical or biological attack
- C04B2111/28—Fire resistance, i.e. materials resistant to accidental fires or high temperatures
-
- 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
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
Abstract
The invention discloses a kind of High-strength self-compaction concrete and preparation method, the High-strength self-compaction concrete composition and its mass percent are as follows: cementitious material: 15~32；Aggregate: 20~35；Sand: 20~42；Expanded vermiculite: 3~12；Water-reducing agent: 0.1~0.8；Thickener: 0.04~0.5；Thixotropic lubricant: 0.2%~1.5%；Stalk fibre: 0.08~0.8；Water: 10~25, cementitious material, stalk fibre needed for ingredient, thickener are put together and are stirred, being stirred the time is 3~6 minutes, is then sequentially added wherein according still further to water, water-reducing agent needed for ingredient, thixotropic lubricant, continue stirring 5~10 minutes, obtains pulpous state mixture；B, aggregate, sand and expanded vermiculite is added in the pulpous state mixture obtained to step A, stirring 3~6 minutes, obtain self-compacting concrete, the present invention can be effectively improved the performance of concrete, keep mobility and the caking property of mixture more preferable, has the characteristics that better education resistance, pull resistance, crack resistance, self-filling ability, clearance through, volume stability.
Description
Technical field
The invention belongs to building material technical fields, and in particular to a kind of High-strength self-compaction concrete and preparation method.
Background technique
Currently, cast-in-place concrete generallys use pumping in concrete construction, vibrated using hand-held vibrating head etc.
It is closely knit, but face large volume, large span component, not can guarantee at all feeding uniformly, vibration compacting, it is therefore desirable to using a kind of
It is more suitable for high performance flowing concrete, to meet needs.
Self-compacting concrete is more demanding to workability and durability, raw material and match ratio are required it is also very harsh,
The mix-design of self-compacting concrete needs to fully consider self-compacting concrete mobility, education resistance, self-filling ability, slurry
Correlation and its contradiction between body dosage and volume stability.In order to guarantee the performance of concrete, it joined various differences
The additive of performance is adjusted, and currently used concrete admixture, which can play, reduces water consumption, control setting time, is mentioned
The effects of high-durability, but the performance of additive is single, is not able to satisfy a variety of demands, it is therefore desirable to by optimum experimental formula,
The performance for improving concrete, keeps the application prospect of concrete more wide.
Summary of the invention
The present invention is directed to existing self-compacting concrete, provides a kind of High-strength self-compaction concrete and system
Preparation Method can be effectively improved the performance of concrete, keep the mobility of mixture and caking property more preferable, have better anti-isolation
Property, pull resistance, crack resistance, self-filling ability, clearance through, fire resistance, durability, volume stability the features such as, and produce more
Add environmental protection, substantially reduce the cost of self-compacting concrete, is especially suitable for large area, the high density reinforcing bar of large span, abnormity knot
The continuous concreting of structure.
In order to solve the above-mentioned technical problems, the present invention provides the following technical solutions:
A kind of High-strength self-compaction concrete of the present invention and preparation method, the High-strength self-compaction concrete composition and its matter
It is as follows to measure percentage: cementitious material: 15~32；Aggregate: 20~35；Sand: 20~42；Expanded vermiculite: 3~12；Water-reducing agent: 0.1
~0.8；Thickener: 0.04~0.5；Thixotropic lubricant: 0.2%~1.5%；Stalk fibre: 0.08~0.8；Water: 10~25.
As a preferred technical solution of the present invention, the cementitious material be made of cement and iron tailings slag micro mist or by
Cement and Pb-Zn tailings slag micro mist composition, wherein mass percent of the cement in cementitious material is 40~75%, iron tailings slag
The mass percent of micro mist or Pb-Zn tailings slag micro mist in cementitious material be 20~45%, cement be label 42.5MPa with
On ordinary portland cement.
As a preferred technical solution of the present invention, the aggregate be construction refuse regenerated aggregate, partial size be 6mm~
25mm, grading limit: 16mm standard screen screen over-size accounts for 25%~40%, 9.5mm standard screen screen over-size and accounts for 15%~35%,
4.75 standard screen screen over-sizes account for 20%~35%.
As a preferred technical solution of the present invention, the sand is middle sand and fine sand, and ratio is 1:1~4:1, fineness mould
Number is 2.0~2.9.It using the sand of different fineness modulus, can be good between filling and aggregate, form compactness height, flowing
Property good concrete, so that more high-strength concrete product is formed, to meet the higher building of various Structural strength calls
Engineering.
As a preferred technical solution of the present invention, the expanded vermiculite partial size is 0.4mm~1.8mm, and accumulation is held
Weight is 80~220kg/m3.
As a preferred technical solution of the present invention, the water-reducing agent is lignosulfonates and naphthalene series high-efficiency water-reducing agent
Compound, ratio be 1:1~1:3.
As a preferred technical solution of the present invention, the thickener is powdered hydroxypropyl methyl cellulose, is glued
Degree is 200000Pa.S~300000Pa.S.
As a preferred technical solution of the present invention, the stalk fibre be by by rice straw, wheat stalk or
Made of after the processing such as corn straw smashing drying, length is 0.8~7mm, and density is 300~450kg/m3；The thixotroping
Lubricant selects model PTZ08 or PTZ18.
The present invention also provides a kind of preparation method of High-strength self-compaction concrete, should the preparation method is as follows:
A, cementitious material, stalk fibre needed for ingredient, thickener are put together and is stirred, being stirred the time is
It 3~6 minutes, is then sequentially added wherein according still further to water, water-reducing agent needed for ingredient, thixotropic lubricant, continues 5~10 points of stirring
Clock obtains pulpous state mixture；
B, aggregate, sand and expanded vermiculite is added in the pulpous state mixture obtained to step A, stirs 3~6 minutes, obtains from close
Real concrete.
The beneficial effects obtained by the present invention are as follows being:
(1) present invention can be effectively improved the performance of concrete, keep the mobility of mixture and caking property more preferable, have more
The spies such as good education resistance, pull resistance, crack resistance, self-filling ability, clearance through, fire resistance, durability, volume stability
Point, and production is more environmentally-friendly, substantially reduces the cost of self-compacting concrete, is especially suitable for large area, the high density of large span
The continuous concreting of reinforcing bar, polymorphic structure；
(2) there is good resistance stretcher strain ability using stalk fibre, specific gravity is lighter, keeps self-compacting concrete whole more
Flexible, and China has stalk resource abundant, can save vast resources, be conducive to the living environment of the mankind；Utilize water
Mud and iron tailings slag micro mist or good grain composition by cement and Pb-Zn tailings slag micro mist, can function well as micro-aggregate
Effect improves the intensity and durability of self-compacting concrete；
(3) expanded vermiculite can be used as refractory aggregate, thus the present invention has fabulous fire-proof and thermal-insulation effect.
Specific embodiment
Below in conjunction with specific embodiment, the invention will be further described, but protection scope of the present invention is not limited only to down
State the content of embodiment.
Embodiment 1
Raw material are weighed according to following parts by weight:
Cementitious material 23 (mass percent of the cement in cementitious material is 60%), aggregate 32, sand 27 (middle sand and fine sand
Ratio be 2:1), expanded vermiculite 5, water-reducing agent 0.2, thickener 0.1, thixotropic lubricant 0.3%, stalk fibre 0.3, water 12.
After raw material are prepared, preparation method is as follows:
(1) cementitious material, stalk fibre needed for ingredient, thickener are put together and is stirred, be stirred the time
It is 3~6 minutes, is then sequentially added wherein according still further to water, water-reducing agent needed for ingredient, thixotropic lubricant, continue stirring 5~10
Minute, obtain pulpous state mixture；
(2) aggregate, sand and expanded vermiculite is added in the pulpous state mixture obtained to step (1), stirs 3~6 minutes, obtains certainly
Air-free concrete, 28 days compression strength are 43MPa, slump flow test 710mm.
Embodiment 2:
Raw material are weighed according to following parts by weight:
Cementitious material 25 (mass percent of the cement in cementitious material is 50%), aggregate 28, sand 30 (middle sand and fine sand
Ratio be 4:1), expanded vermiculite 6, water-reducing agent 0.6, thickener 0.1, thixotropic lubricant 0.1%, stalk fibre 0.2, water 10.
After raw material are prepared, preparation method is as follows:
(1) cementitious material, stalk fibre needed for ingredient, thickener are put together and is stirred, be stirred the time
It is 3~6 minutes, is then sequentially added wherein according still further to water, water-reducing agent needed for ingredient, thixotropic lubricant, continue stirring 5~10
Minute, obtain pulpous state mixture；
(2) aggregate, sand and expanded vermiculite is added in the pulpous state mixture obtained to step (1), stirs 3~6 minutes, obtains certainly
Air-free concrete, 28 days compression strength are 43MPa, slump flow test 740mm.
Embodiment 3:
Raw material are weighed according to following parts by weight:
Cementitious material 28 (mass percent of the cement in cementitious material is 55%), aggregate 30, sand 23 (middle sand and fine sand
Ratio be 3:1), expanded vermiculite 4, water-reducing agent 0.5, thickener 0.1, thixotropic lubricant 0.2%, stalk fibre 0.2, water 14.
After raw material are prepared, preparation method is as follows:
(1) cementitious material, stalk fibre needed for ingredient, thickener are put together and is stirred, be stirred the time
It is 3~6 minutes, is then sequentially added wherein according still further to water, water-reducing agent needed for ingredient, thixotropic lubricant, continue stirring 5~10
Minute, obtain pulpous state mixture；
(2) aggregate, sand and expanded vermiculite is added in the pulpous state mixture obtained to step (1), stirs 3~6 minutes, obtains certainly
Air-free concrete, 28 days compression strength are 46MPa, slump flow test 765mm.
The present invention can be effectively improved the performance of concrete, keep the mobility of mixture and caking property more preferable, have more preferable
Education resistance, pull resistance, crack resistance, self-filling ability, clearance through, fire resistance, durability, volume stability the features such as,
And production is more environmentally-friendly, substantially reduces the cost of self-compacting concrete, is especially suitable for large area, the high density steel of large span
The continuous concreting of muscle, polymorphic structure；
There is good resistance stretcher strain ability using stalk fibre, specific gravity is lighter, there is self-compacting concrete integrally more
Toughness, and China has stalk resource abundant, can save vast resources, be conducive to the living environment of the mankind；Utilize cement
With iron tailings slag micro mist or by the good grain composition of cement and Pb-Zn tailings slag micro mist, the effect of micro-aggregate can be functioned well as
Fruit improves the intensity and durability of self-compacting concrete；
Expanded vermiculite can be used as refractory aggregate, thus the present invention has fabulous fire-proof and thermal-insulation effect.
Finally, it should be noted that the foregoing is only a preferred embodiment of the present invention, it is not intended to restrict the invention,
Although the present invention is described in detail referring to the foregoing embodiments, for those skilled in the art, still may be used
To modify the technical solutions described in the foregoing embodiments or equivalent replacement of some of the technical features.
All within the spirits and principles of the present invention, any modification, equivalent replacement, improvement and so on should be included in of the invention
Within protection scope.
Claims (4)
1. a kind of High-strength self-compaction concrete, which is characterized in that the High-strength self-compaction concrete composition and its quality percentage
Number is as follows: cementitious material: 15 ~ 32；Aggregate: 20 ~ 35；Sand: 20 ~ 42；Expanded vermiculite: 3 ~ 12；Water-reducing agent: 0.1 ~ 0.8；Thickening
Agent: 0.04 ~ 0.5；Thixotropic lubricant: 0.2 ~ 1.5；Stalk fibre: 0.08 ~ 0.8；Water: 10 ~ 25, above-mentioned each component quality hundred
The sum of score meets 100%；The aggregate is construction refuse regenerated aggregate, and partial size is 6mm ~ 25mm, grading limit: 16mm
Standard screen screen over-size accounts for 25% ~ 40%, 9.5mm standard screen screen over-size and accounts for 15% ~ 35%, and 4.75 standard screen screen over-sizes account for 20% ~ 35%；Institute
Stating sand is middle sand and fine sand, and ratio is 1:1 ~ 4:1, and fineness modulus is 2.0 ~ 2.9；
It using the sand of different fineness modulus, can be good between filling and aggregate, form the coagulation of compactness height, good fluidity
Soil, so that more high-strength concrete product is formed, to meet the higher architectural engineering of various Structural strength calls；Described
Expanded vermiculite partial size is 0.4mm ~ 1.8mm, and accumulation bulk density is 80 ~ 220kg/m3；The water-reducing agent is lignosulfonates and naphthalene
The compound of series high-efficiency water-reducing agent, ratio are 1:1 ~ 1:3；The stalk fibre is by by rice straw, wheat stalk or jade
Made of rice stalk crushes after drying processing, length is 0.8 ~ 7mm, and density is 300 ~ 450 kg/m3；The thixotropic lubricant
Select model PTZ08 or PTZ18.
2. a kind of High-strength self-compaction concrete according to claim 1, which is characterized in that the cementitious material by cement and
Iron tailings slag micro mist is formed or is made of cement and Pb-Zn tailings slag micro mist, wherein mass percent of the cement in cementitious material
Be 40 ~ 75%, the mass percent of iron tailings slag micro mist or Pb-Zn tailings slag micro mist in cementitious material be 20 ~ 45%, cement and
The sum of iron tailings slag micro mist or Pb-Zn tailings slag micro mist mass percent meet 100%, and cement is the general of label 42.5MPa or more
Logical portland cement.
3. a kind of High-strength self-compaction concrete according to claim 1, which is characterized in that the thickener is powdered
Hydroxypropyl methyl cellulose, viscosity are the Pa of 200000Pa S ~ 300000 S.
4. a kind of High-strength self-compaction concrete according to claim 1, which is characterized in that the preparation method is as follows:
A, cementitious material, stalk fibre needed for ingredient, thickener are put together and is stirred, being stirred the time is 3 ~ 6
Minute, it is then sequentially added wherein according still further to water, water-reducing agent needed for ingredient, thixotropic lubricant, continues stirring 5 ~ 10 minutes, obtain
To pulpous state mixture；
B, aggregate, sand and expanded vermiculite is added in the pulpous state mixture obtained to step A, stirs 3 ~ 6 minutes, obtains self-compaction coagulation
Soil.
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| CN106966641A (en) * | 2017-02-14 | 2017-07-21 | 陕西理工学院 | High-strength tenacity concrete formulation |
| CN107060196B (en) * | 2017-03-24 | 2023-04-07 | 中铁装配式建筑股份有限公司 | Wall unit and wall |
| CN107010904A (en) * | 2017-05-18 | 2017-08-04 | 聂超 | A kind of renewable building material and preparation method thereof |
| CN107500650A (en) * | 2017-08-31 | 2017-12-22 | 河北建筑工程学院 | A kind of iron tailings sand self-compacting concrete and preparation method thereof |
| CN108892535B (en) * | 2018-08-31 | 2021-03-09 | 马鞍山十七冶工程科技有限责任公司 | Building formwork self-leveling recycled lightweight aggregate concrete and preparation method thereof |
| CN110144880A (en) * | 2019-05-28 | 2019-08-20 | 连云港晟宇新型建材有限公司 | A kind of prestressed high-strength concrete pile and preparation method thereof of non-evaporating pressure |
| CN113024166A (en) * | 2019-12-24 | 2021-06-25 | 南通市建设混凝土有限公司 | Anti-permeability and anti-drying shrinkage high-homogeneity self-compacting concrete and preparation process thereof |
| CN111454028A (en) * | 2020-04-08 | 2020-07-28 | 广东融泉汇混凝土有限公司 | Mixture with fire-resistant and heat-insulating functions |
| CN111892346A (en) * | 2020-04-26 | 2020-11-06 | 东北电力大学 | Environment-friendly modified straw fiber regenerated fine aggregate cement-based composite material and preparation method thereof |
| CN112266203B (en) * | 2020-10-14 | 2021-11-19 | 阳新娲石商砼有限公司 | Recycled fine aggregate high-strength self-compacting concrete and preparation method thereof |
| CN114853413B (en) * | 2022-04-25 | 2023-02-21 | 深圳市衡骏环保科技有限公司 | Self-compacting concrete capable of recycling solid waste and preparation method thereof |
| CN115572134B (en) * | 2022-10-19 | 2023-12-19 | 水利部交通运输部国家能源局南京水利科学研究院 | Light high-temperature-resistant ultra-high-performance concrete and preparation method thereof |
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