CN109503068A - Low frequency vibration compacting, expansive concrete and preparation method thereof - Google Patents
Low frequency vibration compacting, expansive concrete and preparation method thereof Download PDFInfo
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- CN109503068A CN109503068A CN201811382568.9A CN201811382568A CN109503068A CN 109503068 A CN109503068 A CN 109503068A CN 201811382568 A CN201811382568 A CN 201811382568A CN 109503068 A CN109503068 A CN 109503068A
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- low frequency
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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
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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
- 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
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The present invention relates to a kind of low frequency vibration compactings, expansive concrete and preparation method thereof, low frequency vibration compacting, expansive concrete include cementitious material, swelling agent, swelling agent and the weight percent of cementitious material are 1:5.0~15.0%, swelling agent includes sulphoaluminate expander, additive, the weight percent of additive and sulphoaluminate expander is 1:1.0~3.0%, additive NaAlO2And KAlO2One or both of, cementitious material includes cement, active blend, and it further includes sand material, building stones, water, water-reducing agent that active blend, which is the complex mineral blending material that flyash and zeolite powder form,；Preparation method is that sand material, building stones, cementitious material and swelling agent are sequentially added blender according to the above dosage by (1)；(2) water-reducing agent and water are configured to solution according to the above dosage, diminishing agent solution are added with uniform speed into blender, and stir evenly；(3) by the concreting stirred evenly to vibration die station, low frequency vibrates 2min.
Description
Technical field
The present invention relates to technical field of concrete, more particularly to a kind of low frequency vibration compacting, expansive concrete.
Background technique
Assembled architecture is the main trend of construction industry development, and the primary structure form of assembled architecture is then concrete
Soil structure.Connection in precast concrete between prefabricated components can bring a large amount of rear pouring concrete, if directlying adopt general
After logical concreting, normal concrete can inevitably be shunk, serious to even result in cracking, influence structure peace
Entirely.It is existing that swelling agent is generally added in normal concrete, normal concrete is compensated using the bulking effect that swelling agent generates
Contraction, the concrete of volume stability is made.
But after swelling agent is added in existing normal concrete, generally there are following defects:
(1) existing swelling agent generally uses calcium sulphoaluminate class swelling agent, calcium oxide expansion agents, calcium sulphoaluminate-oxidation
Calcium class swelling agent and magnesia class swelling agent, using this kind of swelling agent to concrete Minerals admixture aquation and agent on crack resistance of concrete carbon
Change, resisting erosion of sulfate etc. impact.
(2) swelling agent has a major impact concrete density and hydrated product, and swelling agent aquation usually occurred in early stage,
Early expansion rate is fast, and stability is poor, may cause the aquation water deficient of later period cement granules, such as moisturizing not in time, aquation
To just it stop, and drying shrinkage continues, intensity does not increase, and crack is caused to occur in advance.
Summary of the invention
A kind of low frequency vibration compacting of the present invention, expansive concrete, including cementitious material, swelling agent, the swelling agent
Weight percent with cementitious material is 1:5.0~15.0%.
Preferably, the swelling agent includes sulphoaluminate expander, additive, and the additive and calcium sulphoaluminate expand
The weight percent of agent is 1:1.0~3.0%.
It is preferably in any of the above-described scheme, the additive is NaAlO2And KAlO2One or both of.
It being preferably in any of the above-described scheme, the cementitious material includes cement, active blend,
Wherein, in every cubic meter of concrete, the cement consumption be 240~300kg, active blend dosage be 60~
120kg。
It is preferably in any of the above-described scheme, the active blend is that the complex mineral that flyash and zeolite powder form is mixed
Material is closed, the cement is the portland cement or ordinary portland cement of strength grade 42.5R.
It is preferably in any of the above-described scheme, further includes sand material, building stones, water, water-reducing agent,
Wherein, in every cubic meter of concrete, the sand material dosage is 920~1110kg, and the building stones dosage is 810-
1000kg, the water consumption are 160~175kg, and the water-reducing agent dosage is 2.1~3.6kg.
It is preferably in any of the above-described scheme, the sand material is Machine-made Sand, and fineness modulus is 2.3~2.8.
It is preferably in any of the above-described scheme, the building stones are 5~20mm continuous grading rubble.
It is preferably in any of the above-described scheme, the water-reducing agent is high performance water reducing agent of polyocarboxy acid, wherein changing mixed with viscosity
Property agent and defoaming agent.
The preparation method of a kind of low frequency vibration compacting of the present invention, expansive concrete, includes the following steps:
(1) sand material, building stones, cementitious material and swelling agent are sequentially added into blender according to the above dosage；
(2) water-reducing agent and water are configured to solution according to the above dosage, diminishing is added with uniform speed into blender
Agent solution, and stir evenly；
(3) by the concreting to template stirred evenly, low frequency vibrates 2min.
Compared with prior art, it advantage for present invention and has the beneficial effect that since pouring concrete is constructed after existing
It easily shrinks, crack, for the deformation performance for improving concrete, introduce swelling agent, NaAlO2 and KAlO2 energy and cement in additive
In the mineral facies such as C3S, C2S and C3A and gypsum hydration reaction, sequestered AlO2 occurs-It can promote the generation of entringite, produce
Raw volume expansion, swell increment is big, expands after 28 days basicly stable.Swelling agent even inflation, swelling agent hydrated product are fillable mixed
Solidifying soil part hole, its closely knit microstructure, NaAlO2 and KAlO2 aqueous solution can reduce calcium sulphoaluminate reaction consumption in alkalinity
Alkalinity, can reduce the influence to concrete carbonization, the durability of concrete is increased dramatically.Flyash and zeolite powder are
Porous mass has good Water-saving effect, and with the progress of hydration reaction, flyash and zeolite powder slow release water are realized
Self-curing, while advantageously ensuring that the stability of entringite.Using the material of the concrete, the strength grade of concrete of acquisition is
C30, after pour construction after, it is normal to conserve ungauged regions deformation and crack.
Low frequency vibration compacting of the invention, expansive concrete are described further below.
Specific embodiment
The present invention relates to a kind of low frequency vibration compacting, expansive concrete, including cementitious material, swelling agent, swelling agents
Weight percent with cementitious material is 1:5.0~15.0%.Using the proportion of swelling agent and cementitious material, coagulation both can guarantee
Soil, which is shunk, to be required, and can guarantee concrete structure；If swelling agent is very few, it cannot be guaranteed that the contraction of concrete requires, if expansion
Agent is excessive, then can damage to the structure of concrete.
Preferably, swelling agent includes sulphoaluminate expander, additive, the weight hundred of additive and sulphoaluminate expander
Divide than being 1:1.0~3.0%.Additive is one or both of NaAlO2 and KAlO2.
Preferably, cementitious material includes cement, active blend, wherein in every cubic meter of concrete, cement consumption is
240~300kg, active blend dosage are 60~120kg, and active blend is the complex mineral that flyash and zeolite powder form
Admixture, cement are the portland cement or ordinary portland cement of strength grade 42.5R.
It preferably, further include sand material, building stones, water, water-reducing agent, wherein in every cubic meter of concrete, sand material dosage is 920
~1110kg, sand material are Machine-made Sand, and fineness modulus is 2.3~2.8, and building stones dosage is 810-1000kg, and building stones are 5~20mm
Continuous grading rubble, water consumption are 160~175kg, and water-reducing agent dosage is 2.1~3.6kg, and water-reducing agent subtracts for poly-carboxylic high-performance
Aqua, wherein mixed with viscosity modifier and defoaming agent.
Since existing rear pouring concrete construction easily contraction, cracking introduce expansion for the deformation performance of improvement concrete
Agent, with the mineral facies such as C3S, C2S and C3A in cement and gypsum hydration reaction, trip can occur for NaAlO2 and KAlO2 in additive
Release AlO2-It can promote the generation of entringite, generate volume expansion, swell increment is big, expands after 28 days basicly stable.Swelling agent is equal
Concrete parts hole, its closely knit microstructure, NaAlO2 and KAlO2 aqueous solution can be filled in even expansion, swelling agent hydrated product
In alkalinity, the alkalinity of calcium sulphoaluminate reaction consumption can be reduced, can reduce the influence to concrete carbonization, the durability of concrete
It is increased dramatically.Flyash and zeolite powder are porous mass, have good Water-saving effect, with the progress of hydration reaction,
Flyash and zeolite powder slow release water realize Self-curing, while advantageously ensuring that the stability of entringite.Using the concrete
Material, the strength grade of concrete of acquisition is C30, after pour construction after, it is normal to conserve ungauged regions deformation and crack.
The invention further relates to the preparation methods of a kind of low frequency vibration compacting, expansive concrete, include the following steps:
(1) sand material, building stones, cementitious material and swelling agent are sequentially added into blender according to the above dosage；
(2) water-reducing agent and water are configured to solution according to the above dosage, diminishing is added with uniform speed into blender
Agent solution, and stir evenly；
(3) by the concreting to template stirred evenly, low frequency vibrates 2min (horizontal or vertical).
For the vibration compacting performance for improving concrete, viscosity modifier is introduced, makes concrete in the lower condition of the slump
Under, lower dynamic viscosity is obtained, is easily paved in process of vibrating closely knit；To reduce the porosity after concrete hardening, introduce
A certain amount of defoaming agent.And due to be viscosity modifier and defoaming agent are dissolved in water-reducing agent be used in combination, can synergistic effect,
After water-reducing agent is added, viscosity is increased with mixing speed and is slowly reduced by concrete mix, has larger preferable thixotropy
(for naked eyes it is observed that when static, concrete diffusion is smaller, and when gentle agitation, the diffusion area of concrete is very big).In this way,
Concrete mix is easy to vibrate by low frequency vibration compacting using low frequency, and vibrating for component, whole noise can be completed
Concrete not bleeding that is small, and obtaining, Yi Mishi, compression strength with higher, surface no significant defect.
Embodiment 1
The preparation method of the low frequency vibration compacting of the present embodiment, expansive concrete, includes the following steps:
(1) sand material: 970kg, building stones: 950kg, cementitious material (cement: 300kg, active blend (flyash: 30kg；
Zeolite powder: 30kg)), (weight percent of additive and sulphoaluminate expander is 1:1.5% to swelling agent, wherein sulphur aluminic acid
Calcium swelling agent: 31kg, NaAlO2:0.31kg, KAlO2:0.155kg), by sand material, building stones, cementitious material and swelling agent according to
Upper dosage sequentially adds blender；
(2) water-reducing agent: 3.6kg, water: water-reducing agent and water are configured to solution according to the above dosage, to blender by 165kg
In diminishing agent solution is added with uniform speed, and stir evenly；
(3) by the concreting to template stirred evenly, low frequency vibrates 2min.
Embodiment 2
(1) sand material: 920kg, building stones: 1000kg, cementitious material (cement: 240kg, active blend (flyash:
40kg；Zeolite powder: 80kg)), (weight percent of additive and sulphoaluminate expander is 1:1.0% to swelling agent, wherein sulphur
Bulking agent of calcium aluminate: 28kg, NaAlO2:0.28kg), successively according to the above dosage by sand material, building stones, cementitious material and swelling agent
Blender is added；
(2) water-reducing agent: 3.4kg, water: water-reducing agent and water are configured to solution according to the above dosage, to blender by 170kg
In diminishing agent solution is added with uniform speed, and stir evenly；
(3) by the concreting to template stirred evenly, low frequency vibrates 2min.
Embodiment 3
(1) sand material: 1110kg, building stones: 810kg, cementitious material (cement: 280kg, active blend (flyash:
10kg；Zeolite powder: 70kg)), (weight percent of additive and sulphoaluminate expander is 1:2.4% to swelling agent, wherein sulphur
Bulking agent of calcium aluminate: 34kg, KAlO2:0.816kg), successively according to the above dosage by sand material, building stones, cementitious material and swelling agent
Blender is added；
(2) water-reducing agent: 3.2kg, water: water-reducing agent and water are configured to solution according to the above dosage, to blender by 175kg
In diminishing agent solution is added with uniform speed, and stir evenly；
(3) by the concreting to template stirred evenly, low frequency vibrates 2min.
Embodiment 4
(1) sand material: 920kg, building stones: 1000kg, cementitious material (cement: 290kg, active blend (flyash:
30kg；Zeolite powder: 40kg)), (weight percent of additive and sulphoaluminate expander is 1:3.0% to swelling agent, wherein sulphur
Bulking agent of calcium aluminate: 32kg, NaAlO2:0.48；KAlO2:0.48kg), by sand material, building stones, cementitious material and swelling agent according to
The above dosage sequentially adds blender；
(2) water-reducing agent: 3.6kg, water: water-reducing agent and water are configured to solution according to the above dosage, to blender by 160kg
In diminishing agent solution is added with uniform speed, and stir evenly；
(3) by the concreting to template stirred evenly, low frequency vibrates 2min.
Wherein the dosage of each material is as shown in Table 1:
In 1 Examples 1 to 4 of table in every cubic meter of concrete each material dosage (kg)
Concrete obtained in above-described embodiment 1~4 is subjected to service check, the results are shown in Table 2:
The performance indicator of concrete during 2 Examples 1 to 4 pouring molding of table
As can be seen from Table 2, concrete prepared in Examples 1 to 4, expansion rate are convenient.
Embodiment described above only describe the preferred embodiments of the invention, not to model of the invention
It encloses and is defined, without departing from the spirit of the design of the present invention, those of ordinary skill in the art are to technical side of the invention
The various changes and improvements that case is made should all be fallen into the protection scope that claims of the present invention determines.
Claims (10)
1. a kind of low frequency vibration compacting, expansive concrete, including cementitious material, swelling agent, it is characterised in that: the expansion
The weight percent of agent and cementitious material is 1:5.0~15.0%.
2. low frequency vibration compacting according to claim 1, expansive concrete, it is characterised in that: the swelling agent packet
Include sulphoaluminate expander, additive, the weight percent of the additive and sulphoaluminate expander is 1:1.0~3.0%.
3. low frequency vibration compacting according to claim 2, expansive concrete, it is characterised in that: the additive is
NaAlO2And KAlO2One or both of.
4. low frequency vibration compacting according to claim 1, expansive concrete, it is characterised in that: the cementitious material
Including cement, active blend,
Wherein, in every cubic meter of concrete, the cement consumption is 240~300kg, and active blend dosage is 60~120kg.
5. low frequency vibration compacting according to claim 4, expansive concrete, it is characterised in that: the activity blends
Material is the complex mineral blending material that flyash and zeolite powder form, portland cement that the cement is strength grade 42.5R or
Ordinary portland cement.
6. low frequency vibration compacting according to claim 1, expansive concrete, it is characterised in that: further include sand material, stone
Material, water, water-reducing agent,
Wherein, in every cubic meter of concrete, the sand material dosage be 920~1110kg, the building stones dosage be 810-1000kg,
The water consumption is 160~175kg, and the water-reducing agent dosage is 2.1~3.6kg.
7. low frequency vibration compacting according to claim 6, expansive concrete, it is characterised in that: the sand material is machine
Sand processed, fineness modulus are 2.3~2.8.
8. low frequency vibration compacting according to claim 6, expansive concrete, it is characterised in that: the building stones be 5~
20mm continuous grading rubble.
9. low frequency vibration compacting according to claim 6, expansive concrete, it is characterised in that: the water-reducing agent is
High performance water reducing agent of polyocarboxy acid, wherein mixed with viscosity modifier and defoaming agent.
10. the preparation method of a kind of low frequency vibration compacting, expansive concrete, characterized by the following steps:
(1) sand material, building stones, cementitious material and swelling agent are sequentially added into blender according to the above dosage；
(2) water-reducing agent and water are configured to solution according to the above dosage, it is molten with uniform speed addition water-reducing agent into blender
Liquid, and stir evenly；
(3) by the concreting to template stirred evenly, low frequency vibrates 2min.
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| CN110041000A (en) * | 2019-04-19 | 2019-07-23 | 湖北恒利建材科技有限公司 | A kind of premixing high-performance mixed mud admixture and preparation method thereof |
| CN112194415A (en) * | 2020-09-24 | 2021-01-08 | 中国一冶集团有限公司 | Multifunctional box culvert pipe gallery concrete and preparation method thereof |
| CN112341084A (en) * | 2020-11-05 | 2021-02-09 | 中铁建设集团有限公司 | Novel building backfill material |
| CN112777982A (en) * | 2021-01-08 | 2021-05-11 | 中国建筑第八工程局有限公司 | Concrete capable of reducing cracks of underground pipe gallery wallboard |
| CN112897925A (en) * | 2021-02-01 | 2021-06-04 | 李全全 | Shrinkage-reducing concrete high-efficiency water reducing agent |
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