CN109437705A - A kind of lower shrinkage low viscosity high-strength concrete - Google Patents
A kind of lower shrinkage low viscosity high-strength concrete Download PDFInfo
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- CN109437705A CN109437705A CN201811591632.4A CN201811591632A CN109437705A CN 109437705 A CN109437705 A CN 109437705A CN 201811591632 A CN201811591632 A CN 201811591632A CN 109437705 A CN109437705 A CN 109437705A
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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
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Abstract
The invention discloses a kind of lower shrinkage low viscosity high-strength concretes, raw material including following parts by weight: 80-95 parts of microballon, 75-90 parts of pottery sand, 50-65 parts of cement, 45-60 parts of miberal powder, 40-55 parts of ultrafine slag silicon ash, 25-40 parts of carbon fiber, 25-40 parts of fiber bar, 15-30 parts of composite foamable agent, 5-20 parts of high efficiency water reducing agent, surplus is water, preparation method includes the following steps: first by the microballon of the above parts by weight, pottery sand, cement is added sequentially in blender, then miberal powder is sequentially added, ultrafine slag silicon ash, carbon fiber stirs 20-35min, obtain mixed liquor A；The fiber bar of the above parts by weight is added to crush to be then added in mixed liquor A in pulverizer and obtains mixed liquid B；It sequentially adds composite foamable agent, high efficiency water reducing agent and water in mixed liquid B to be mixed, foam naturally dry under 135-140 °C, obtains lower shrinkage low viscosity high-strength concrete.The present invention reduces concrete shrinkage crack using fiber；Super high strength concrete viscosity is improved using microballon, improves mobility, gained high-strength concrete can be widely applied to building engineering field, function admirable.
Description
Technical field
The present invention relates to High Strength Concrete Technology field more particularly to a kind of lower shrinkage low viscosity high-strength concretes.
Background technique
High-strength concrete is as a kind of new construction material, with its compression strength is high, non-deformability is strong, density is big, hole
The low superiority of gap rate is widely used in high building structure, long-span bridge girder construction and certain unique constructions.
The feature of high-strength concrete maximum is compression strength height, generally the 46 of regular tenacity concrete times, therefore can reduce component
Section, therefore optimum is used for skyscraper.Experiments have shown that in certain axial compression ratio and suitable stirrup ratio, it is high-strength
Concrete frame trestle has preferable anti-seismic performance。And column cross-section size reduces, and mitigates self weight, avoids short column, and it is anti-to structure
Shake is also advantageous, and improves economic benefit.High-strength concrete material provides advantage for prestressing technique, and height can be used
Intensity steel and artificial proof stress, to greatly increase the bending stiffness and crack resistance of flexural member.Therefore world's model
It is applied in large span house and bridge using prestressed High Strength Concrete Structures are applied more and more in enclosing.
Existing concrete preparation process is complicated, and preparation cost is high, without high intensity, lower shrinkage, low viscosity it is excellent
Point, there are significant limitations on, and therefore, we have proposed a kind of lower shrinkage low viscosity high-strength concretes for solving
State problem.
Super high strength concrete refer to cubic compressive strength be greater than 100MPa concrete, but because its gel material content compared with
Height (600~700kg/m3), water-cement ratio it is low (0.18~0.21), the higher (18~25kg/m of additive usage3), in addition superactivity
Material silicon ash, so that the super high strength concrete heat of hydration is high, shrinkage cracking is serious, while biggish viscosity leads to super high strength concrete
The problems such as pumping difficulties in the application, gradually displays.Increasingly developed with technology, what super high strength concrete highlighted asks
Topic gradually makes moderate progress, but is single aspect.As " a kind of lower shrinkage low viscosity superelevation is strong by Chinese patent CN104844099A
Concrete ", super high strength concrete viscosity is improved using microballon, reduces concrete shrinkage crack, concrete is increased using miberal powder
Intensity, but its technology is not solved the problems, such as to shrink yet very well and be cracked.Such as a kind of Chinese patent CN108947566A " lower shrinkage low viscosity
High-strength concrete ", concrete shrinkage crack is reduced using fiber, reduces concrete shrinkage crack, but causes concrete conveyance tired
It is difficult；Increase the intensity of concrete using miberal powder, but its technology does not solve the problems, such as high viscosity very well yet.
Summary of the invention
Technical problems based on background technology, the invention proposes a kind of lower shrinkage low viscosity high-strength concretes.Hair
It is bright mainly solve the problems, such as it is as follows: using fiber reduce concrete shrinkage crack；Super high strength concrete viscosity is improved using microballon, is mentioned
High fluidity.
A kind of lower shrinkage low viscosity high-strength concrete proposed by the present invention, the raw material including following parts by weight: microballon 80-95
Part, 75-90 parts of pottery sand, 50-65 parts of cement, 45-60 parts of miberal powder, 40-55 parts of ultrafine slag silicon ash, 25-40 parts of carbon fiber, fiber
25-40 parts of muscle, 15-30 parts of composite foamable agent, 5-20 parts of high efficiency water reducing agent, surplus is water.
Preferably, the raw material including following parts by weight: 90 parts of microballon, 85 parts of pottery sand, 60 parts of cement, 55 parts of miberal powder, ultra-fine
50 parts of slag silicon ash, 34 parts of carbon fiber, 34 parts of fiber bar, 24 parts of composite foamable agent, 13 parts of high efficiency water reducing agent, surplus is water.
Preferably, the mass ratio of the carbon fiber and fiber bar is 1:1.5.
Preferably, the composite foamable agent is made of sodium metasilicate, and the mass ratio of composite foamable agent and high efficiency water reducing agent
For 3-6:1-5.
Microballon used in super high strength concrete of the invention is selected by oneself Particular craft using high-quality fly ash
The powder product of the global shape of a kind of ultra-fine (sub-micron) out.Because its unique spherical-like morphology and particle diameter scale, microballon have
Significantly " shape effect ", " active effect ", " micro aggregate effect " have apparent diminishing, viscosity reduction, enhancing to make in concrete
With being a kind of novel high-performance admixture haveing excellent performance.By large dosage technology, in super high strength concrete, not only enhance,
Viscosity reducing effect is obvious, but also can significantly reduce concrete hydrating temperature rise, reduces concrete shrinkage crack.
The microballon is the superfined flyash of global shape, and bulk density is 800 ~ 1000kg/m3, laser particle size parameter D50
≤ 2 μm, ratio of water dosage is not more than 90%, and loss on ignition is not less than 100% no more than 1%, 28d activity index.
Miberal powder used in super high strength concrete of the invention, 28d activity index are not less than 115%, and surface area is not less than
750m2/ kg is a kind of ultra-fine novel high-performance admixture, active high, early strong, improvement fresh mixing concrete property and power
The effects of learning performance.It applies in super high strength concrete, it is not only obvious to the increasing action of concrete strength, but also concrete
Durability is remarkably improved.
The invention also provides a kind of preparation methods of lower shrinkage low viscosity high-strength concrete, comprising the following steps:
The microballon of the above parts by weight, pottery sand, cement: being first added sequentially in blender by S1, and water is added under the conditions of 30-40 °C
10-25min is stirred, miberal powder, ultrafine slag silicon ash, carbon fiber stirring 20-35min is then sequentially added, obtains mixed liquor A;
S2: the fiber bar of the above parts by weight is added in pulverizer, crushes 30-45min with the speed of 110-140r/min, so
After be added in mixed liquor A and stir evenly, obtain mixed liquid B;
S3: composite foamable agent, high efficiency water reducing agent and water are sequentially added in mixed liquid B and is mixed, is foamed under 135-140 °C
6-9cm, then passes through 6-8 °C of cold water soak 15-30min, and naturally dry obtains lower shrinkage low viscosity high-strength concrete.
Compared with prior art, a kind of lower shrinkage low viscosity high-strength concrete proposed by the present invention have it is good fire prevention,
The advantages that moisture-proof, sound insulation, heat-insulation and heat-preservation, durable, antidetonation, higher intensity and hardness, processing and good casting property, utilize microballon
Obtain high-strength and high-flowing concrete with high efficiency water reducing agent to reduce the ratio of mud, by miberal powder and ultrafine slag silicon ash and
The addition of carbon fiber, fiber bar greatly improves the intensity and hardness of gained concrete, lower shrinkage low viscosity prepared by the present invention
High-strength concrete is compared to conventional concrete material, while guaranteeing concrete high-strength degree performance, also has lower shrinkage, low viscous
The characteristics of spending, while preparation method is simple, gained high-strength concrete can be widely applied to building engineering field, function admirable,
The service life for effectively extending institute's control equipment, is worthy to be popularized.
Specific embodiment
Combined with specific embodiments below the present invention is made further to explain.
Embodiment one
The present embodiment proposes a kind of lower shrinkage low viscosity high-strength concrete, the raw material including following parts by weight: 79 parts of microballon, pottery
76 parts of sand,51 parts of cement,44 parts of miberal powder,42 parts of ultrafine slag silicon ash,27 parts of carbon fiber,27 parts of fiber bar, composite foamable agent 13
Part, 7 parts of high efficiency water reducing agent, surplus is water；
Preparation method includes the following steps:
The microballon of the above parts by weight, pottery sand, cement: being first added sequentially in blender by S1, and water is added and stirs under the conditions of 30 °C
15min is mixed, miberal powder, ultrafine slag silicon ash, carbon fiber stirring 25min is then sequentially added, obtains mixed liquor A;
S2: the fiber bar of the above parts by weight is added in pulverizer, is crushed 32min with the speed of 110r/min, is then added
It is stirred evenly into mixed liquor A, obtains mixed liquid B；
S3: composite foamable agent, high efficiency water reducing agent and water are sequentially added in mixed liquid B and is mixed, is foamed under 140 °C
6cm, then passes through 8 °C of cold water soak 12min, and naturally dry obtains lower shrinkage low viscosity high-strength concrete.
Embodiment two
The present embodiment proposes a kind of lower shrinkage low viscosity high-strength concrete, the raw material including following parts by weight: 84 parts of microballon, pottery
85 parts of sand,54 parts of cement,53 parts of miberal powder,47 parts of ultrafine slag silicon ash,32 parts of carbon fiber,32 parts of fiber bar, composite foamable agent 18
Part, 9 parts of high efficiency water reducing agent, surplus is water；
Preparation method includes the following steps:
The microballon of the above parts by weight, pottery sand, cement: being first added sequentially in blender by S1, and water is added and stirs under the conditions of 33 °C
17min is mixed, miberal powder, ultrafine slag silicon ash, carbon fiber stirring 27min is then sequentially added, obtains mixed liquor A;
S2: the fiber bar of the above parts by weight is added in pulverizer, is crushed 35min with the speed of 125r/min, is then added
It is stirred evenly into mixed liquor A, obtains mixed liquid B；
S3: composite foamable agent, high efficiency water reducing agent and water are sequentially added in mixed liquid B and is mixed, is foamed under 137 °C
6cm, then passes through 6.5 °C of cold water soak 20min, and naturally dry obtains lower shrinkage low viscosity high-strength concrete.
Embodiment three
The present embodiment proposes a kind of lower shrinkage low viscosity high-strength concrete, the raw material including following parts by weight: 91 parts of microballon, pottery
86 parts of sand,62 parts of cement,57 parts of miberal powder,55 parts of ultrafine slag silicon ash,37 parts of carbon fiber,37 parts of fiber bar, composite foamable agent 27
Part, 17 parts of high efficiency water reducing agent, surplus is water；
Preparation method includes the following steps:
The microballon of the above parts by weight, pottery sand, cement: being first added sequentially in blender by S1, and water is added and stirs under the conditions of 37 DEG C
Then 20min sequentially adds miberal powder, ultrafine slag silicon ash, carbon fiber stirring 30min, obtains mixed liquor A;
S2: the fiber bar of the above parts by weight is added in pulverizer, is crushed 45min with the speed of 135r/min, is then added
It is stirred evenly into mixed liquor A, obtains mixed liquid B；
S3: composite foamable agent, high efficiency water reducing agent and water are sequentially added in mixed liquid B and is mixed, is foamed at 140 DEG C
8cm, then passes through 8 DEG C of cold water soak 25min, and naturally dry obtains lower shrinkage low viscosity high-strength concrete.
The foregoing is only a preferred embodiment of the present invention, but scope of protection of the present invention is not limited thereto,
Anyone skilled in the art in the technical scope disclosed by the present invention, according to the technique and scheme of the present invention and its
Inventive concept is subject to equivalent substitution or change, should be covered by the protection scope of the present invention.
Claims (6)
1. a kind of lower shrinkage low viscosity high-strength concrete, which is characterized in that the raw material including following parts by weight: 80-95 parts of microballon,
75-90 parts of pottery sand, 50-65 parts of cement, 45-60 parts of miberal powder, 40-55 parts of ultrafine slag silicon ash, 25-40 parts of carbon fiber, fiber bar
25-40 parts, 15-30 parts of composite foamable agent, 5-20 parts of high efficiency water reducing agent, surplus is water.
2. a kind of lower shrinkage low viscosity high-strength concrete according to claim 1, which is characterized in that the microballon is the whole world
The superfined flyash of shape, bulk density are 800 ~ 1000kg/m3, laser particle size parameter D50≤2 μm, ratio of water dosage is little
In 90%, loss on ignition is not less than 100% no more than 1%, 28d activity index.
3. a kind of lower shrinkage low viscosity high-strength concrete according to claim 1, which is characterized in that the miberal powder, 28d are living
Sex index is not less than 115%, and surface area is not less than 750m2/kg。
4. a kind of lower shrinkage low viscosity high-strength concrete according to claim 1, which is characterized in that the carbon fiber and fibre
The mass ratio for tieing up muscle is 1:1.5.
5. a kind of lower shrinkage low viscosity high-strength concrete according to claim 1, which is characterized in that the composite foamable agent
It is made of sodium metasilicate, and the mass ratio of composite foamable agent and high efficiency water reducing agent is 3-6:1-5.
6. a kind of preparation method of lower shrinkage low viscosity high-strength concrete according to claim 1-5, feature
It is, comprising the following steps:
The microballon of the above parts by weight, pottery sand, cement: being first added sequentially in blender by s1, and water is added under the conditions of 30-40 °C
10-25min is stirred, miberal powder, ultrafine slag silicon ash, carbon fiber stirring 20-35min is then sequentially added, obtains mixed liquor A；
S2: the fiber bar of the above parts by weight is added in pulverizer,30-45min is crushed with the speed of 110-140r/min, so
After be added in mixed liquor A and stir evenly, obtain mixed liquid B；
S3: composite foamable agent, high efficiency water reducing agent and water are sequentially added in mixed liquid B and is mixed, is foamed under 135-140 °C
6-9cm, then passes through 6-8 °C of cold water soak 15-30min, and naturally dry obtains lower shrinkage low viscosity high-strength concrete.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811591632.4A CN109437705A (en) | 2018-12-20 | 2018-12-20 | A kind of lower shrinkage low viscosity high-strength concrete |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811591632.4A CN109437705A (en) | 2018-12-20 | 2018-12-20 | A kind of lower shrinkage low viscosity high-strength concrete |
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| Publication Number | Publication Date |
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| CN109437705A true CN109437705A (en) | 2019-03-08 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201811591632.4A Pending CN109437705A (en) | 2018-12-20 | 2018-12-20 | A kind of lower shrinkage low viscosity high-strength concrete |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112895143A (en) * | 2021-04-16 | 2021-06-04 | 毛倩男 | Low-shrinkage concrete and preparation process thereof |
| CN114477935A (en) * | 2020-10-27 | 2022-05-13 | 成都岷江混凝土有限公司 | Production method of low-viscosity high-strength concrete |
-
2018
- 2018-12-20 CN CN201811591632.4A patent/CN109437705A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114477935A (en) * | 2020-10-27 | 2022-05-13 | 成都岷江混凝土有限公司 | Production method of low-viscosity high-strength concrete |
| CN112895143A (en) * | 2021-04-16 | 2021-06-04 | 毛倩男 | Low-shrinkage concrete and preparation process thereof |
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Application publication date: 20190308 |