CN109836082A - A kind of very-high performance self-compacting concrete and preparation method - Google Patents
A kind of very-high performance self-compacting concrete and preparation method Download PDFInfo
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Abstract
The present invention relates to a kind of very-high performance self-compacting concretes and preparation method thereof, belong to cement and technical field of concrete, very-high performance self-compacting concrete of the invention includes the following component of parts by weight: cementitious material: 90-140 parts of cement, 20-60 parts of miberal powder, 25-55 parts of glass microballoon；Aggregate: 70-105 parts of quartz sand；Admixture: 10-35 parts of silicon ash, 20-60 parts of metallic fiber, 5-10 parts of paraffin, 10-20 parts of carbon fiber；Additive: 1.5-4 parts of composite polycarboxylic acid water reducing agent；22-73 parts of water.Very-high performance self-compacting concrete of the invention has both both ultra-high performance concrete and self-compacting concrete advantage, both there is high fluidity, there are the performances such as high intensity, excellent durability, not easy to crack again, it is easy to promote the use in practical projects, the field that the normal concretes such as special-shaped component can not be applied can also be applied to.
Description
Technical field
The invention belongs to cement and technical field of concrete, it is related to a kind of very-high performance self-compacting concrete and preparation side
Method.
Background technique
Ultra-high performance concrete (Ultra-High Performance Concrete), abbreviation UHPC is over the past thirty years
In most innovative cement base engineering material, realize engineering material performance Great span, with superelevation durability and superelevation
Mechanical property, be increasingly used in engineering practice.
Ultra-high performance concrete eliminates the coarse aggregate that conventional concrete uses, and selects quartz sand as filler aggregate, shape
At biggish bulk density, therefore, ultra-high performance concrete compression strength with higher, tensile strength and excellent durable
Property, it is widely used in the engineerings such as bridge, skyscraper, harbour building.But currently, ultra-high performance concrete is high in order to guarantee
Mechanical property, it is generally existing it is more sticky, be difficult to the problems such as stirring evenly, dry concretes that can be only applied to now more.
Self-compacting concrete (Self Compacting Concrete or Self-Consolidating Concrete letter
Claim SCC) refer under self gravitation effect, it can flow, is closely knit, template can be filled up completely there is fine and close reinforcing bar, together
When obtain fine homogenieity, and do not need the concrete of extraneous vibration.Since self-compacting concrete does not need to vibrate, concrete
The time for pouring needs is greatly shortened, can, thin-walled complex-shaped with pouring molding and intensive arrangement of reinforcement structure, but self-compaction is mixed
Solidifying soil mechanics performance is relatively low, durability is poor, limits its application in engineering.
In conclusion to solve, existing ultra-high performance concrete is more sticky, it is mixed with existing self-compaction to be difficult to stir evenly
The problem that solidifying soil nature energy is relatively low, durability is poor, needs to design one kind and has both ultra-high performance concrete and self-compacting concrete
The two advantage not only has high fluidity, but also concrete and system with the performances such as high intensity, excellent durability, not easy to crack
Preparation Method.
Summary of the invention
The purpose of the present invention is there is the above problem in view of the prior art, provide one kind have both ultra-high performance concrete and
Both self-compacting concretes advantage not only has high fluidity, but also has the performances such as high intensity, excellent durability, not easy to crack
Concrete and preparation method.
Object of the invention can be realized by the following technical scheme: a kind of very-high performance self-compacting concrete, described super
High performance flowing concrete includes the following component of parts by weight:
Cementitious material: 90-140 parts of cement, 20-60 parts of miberal powder, 25-55 parts of glass microballoon；
Aggregate: 70-105 parts of quartz sand；
Admixture: 10-35 parts of silicon ash, 20-60 parts of metallic fiber, 5-10 parts of paraffin, 10-20 parts of carbon fiber；
Additive: 1.5-4 parts of composite polycarboxylic acid water reducing agent；
22-73 parts of water.
In very-high performance self-compacting concrete of the invention, with cement, miberal powder, glass microballoon, quartz sand, metallic fiber,
The materials such as silicon ash, paraffin, carbon fiber, composite polycarboxylic acid water reducing agent, water are main component, are made by the collaboration between each component
With, it improves the performances such as component uniformity, mobility, the mechanics of concrete, reduce concrete product possibility of cracks, realization superelevation
Intensity and self-compaction effect.
In concrete preparation process, cement is reacted with water can constantly release heat generation aquation during hardening of cement
Heat, the heat of hydration can make the internal temperature of concrete substantially exceed outside, so as to cause biggish temperature stress, make concrete surface
Crack is generated, the intensity and other performances of concrete are seriously affected.The present invention is by increasing glass microballoon, miberal powder substitution part water
Mud can reduce cement consumption, reduce the heat of hydration, and glass microballoon and miberal powder can be filled in concrete particle gap, mention
High concrete density, while paraffin is increased in concrete of the present invention, on the one hand, wax phase change temperature is low, can pass through phase
Become and absorb the heat of hydration that cement generates, reduce resulting temperature stress, concrete surface is avoided to generate crack；Another party
Face, paraffin are filled in the particulate interspaces of concrete, and paraffin particles surface is smooth and does not absorb water, the similar rolling in concrete particle
Pearl can reduce the frictional force between particle, reduce the dosage of water, therefore can play the effect of lubrication, and it is viscous to reduce concrete
Poly- property improves concrete workability, and improves the component uniformity；In addition, paraffin is not soluble in water, can be improved concrete impervious
Property, a possibility that metallic fiber gets rusty is reduced, concrete durability is improved.The mixing energy of paraffin and fiber, silicon ash, miberal powder component
Enough improve concrete flowability, keep each component mixing more uniform, by the doping of metallic fiber and carbon fiber, promote fiber with
Other components fusion in concrete, improves the toughness and mechanical property and the possibility for reducing concrete cracking of concrete
Property.
Silicon ash average grain diameter is 0.1-0.3 μm, about 100 times smaller than cement-particle size, and silicon ash activity is higher, and silicon ash is mixed
Incorporation in solidifying soil can generate gelinite with filling concrete hole, simultaneously with hydrated product, improve concrete strength and durability,
Reduce bleeding, improve impermeability etc., but improve concrete water requirement, in the present invention, by with miberal powder, glass microballoon, stone
Wax, composite polycarboxylic acid water reducing agent are used cooperatively, and reduce concrete water requirement.
Preferred technical solution is the quartz sand particle gradation 4.75mm, accumulative to tail over range 10-0, grain composition 600
μm, it is accumulative to tail over range 70-41.
Preferred technical solution is the metallic fiber diameter 0.05-0.2mm, length 10-15mm.The usual toughness of concrete
It is poor, easy to crack, it is remarkably improved the mechanical property of concrete by adding metallic fiber, improves toughness, reduce possibility of cracks.
The metallic fiber dispersed in concrete crosses one another, and with the other compositions gluing in concrete, therefore can substantially reduce mixed
The brittleness for coagulating soil, slows down the extension of material internal microcrack, improves the intensity, toughness, ductility and durability of material.
Preferred technical solution is that the metallic fiber is stainless steel fibre, copper facing steel fibre, one in zinc-plated steel fibre
Kind is a variety of.The advantages that steel fibre has tensile strength high, and elasticity modulus is big, easily produces in batches, therefore be very-high performance coagulation
The widely used fiber of soil.But steel fibre gets rusty easily, and the performance and durability to ultra-high performance concrete can all generate bad
Consequence, therefore one in the preferred stainless steel fibre of very-high performance self-compacting concrete of the present invention, copper facing steel fibre, zinc-plated steel fibre
Kind is a variety of.
Ultra-high performance concrete is to guarantee that very-high performance needs to keep low water-cement ratio, but be easy to cause concrete workability
Difference, poor fluidity.Traditional polycarboxylate water-reducer, after certain range is increased in volume, the water-reducing rate of water-reducing agent, which increases, to be become
It is slow, and concrete shows larger viscosity, places a moment, it may appear that bleeding hardened phenomenon, influence concrete mobility and
Homogeneity, it is therefore desirable to the high water-reducing agent of water-reducing rate.Very-high performance self-compacting concrete of the present invention uses compound polycarboxylic acids diminishing
Agent improves cohesiveness and water-retaining property by compound hydroxymethyl cellulose ether, is adjusted by compound three isopropanol peace, calcium formate
Setting time.It is further preferred that the polycarboxylate water-reducer accounts for the 69-84.7% of composite polycarboxylic acid water reducing agent gross mass.Institute
State hydroxymethyl cellulose ether, triisopropanolamine, calcium formate three account for the 0.3- of the composite polycarboxylic acid water reducing agent gross mass respectively
1%, 5-10%, 10-20%.Experiments verify that said components range can reasonably control containing in ultra-high performance concrete
The size of tolerance and bubble guarantees the homogeneity and appearance of concrete.Further, the composite polycarboxylic acid water reducing agent
Water-reducing rate reach 25-32%.
It is described another object of the present invention is to provide the preparation method of the very-high performance self-compacting concrete described in one kind
Method the following steps are included:
(1), the component of superhigh intensity self-compacting concrete according to claim 1 weighs material, first by heating paraffin
To fusing, then will be pre-processed in paraffin that miberal powder, silicon ash, metallic fiber, carbon fiber are placed in after heating, it is spare；
(2), cement, quartz sand, glass microballoon are first mixed evenly, add water and composite polycarboxylic acid water reducing agent,
Continue stirring to fluidized state, be then added and pass through pretreated miberal powder, silicon ash, metallic fiber, carbon fiber, stirring to dividing completely
It dissipates, obtains superhigh intensity self-compacting concrete.
Include preprocessing process in a kind of preparation method of very-high performance self-compacting concrete of the present invention, first adds paraffin
Heat to melt, then by miberal powder, silicon ash, metallic fiber, carbon fiber be placed in heating after paraffin in pre-process.In the stone of thawing
In wax, miberal powder, silicon ash, metallic fiber, carbon fiber are mutually bonded, and solve miberal powder, silicon ash is easy to produce dust and each component
It is difficult to uniformly mixed problem.In the whipping process of concrete, pretreated miberal powder, silicon ash, metallic fiber, carbon fiber is added
Dimension, continues to stir, and because cement meets the heat of hydration that water reaction generates, paraffin is made still to keep melting state, miberal powder, silicon by heat absorption
Ash, metallic fiber, carbon fiber disperse more uniform, the not only workability of raising concrete, promotion mechanical property, and reduction
Dust optimizes production environment.
Preferred technical solution is that the temporal summation stirred in the step (2) is 5-30min.
Compared with prior art, the invention has the following advantages: very-high performance self-compaction coagulation provided by the invention
Soil is with objects such as cement, miberal powder, glass microballoon, quartz sand, metallic fiber, silicon ash, paraffin, carbon fiber, composite polycarboxylic acid water reducing agents
Material improves the property such as component uniformity, mobility, mechanics of concrete by the synergistic effect between each component for main component
Can, it reduce concrete product possibility of cracks.Very-high performance self-compacting concrete of the invention have both ultra-high performance concrete and
Both self-compacting concretes advantage not only has high fluidity, but also has the performances such as high intensity, excellent durability, not easy to crack.
Very-high performance self-compacting concrete of the invention is easy to promote the use in practical projects, can also be applied to special-shaped component etc.
The field that normal concrete can not be applied.
Specific embodiment
The present invention will be further described below in conjunction with the embodiments.It is below only better embodiment of the invention, this
The protection scope of invention is not limited with above embodiment, as long as those of ordinary skill in the art are disclosed interior according to the present invention
Equivalent modification made by holding or variation, should be included in the scope of the protection described in the claims.
Embodiment 1
A kind of very-high performance self-compacting concrete, material component are as follows: 120 parts of cement, 85 parts of quartz sand, 37 parts of miberal powder, glass
24 parts of glass microballon, 24 parts of silicon ash, 7 parts of paraffin, 45 parts of steel fibre, 15 parts of carbon fiber, 2.5 parts of composite polycarboxylic acid water reducing agent and water 37
Part；Steel fibre diameter 0.05-0.2mm, length 10-15mm, the water-reducing rate of composite polycarboxylic acid water reducing agent is 25%-32%, compound
In polycarboxylate water-reducer, polycarboxylate water-reducer, hydroxymethyl cellulose ether, triisopropanolamine, calcium formate be respectively 1.725 parts,
0.025 part, 0.25 part, 0.5 part.
A kind of preparation method of very-high performance self-compacting concrete, the steps include:
(1), material is weighed according to said components；
(2), by heating paraffin to melting, weighed miberal powder, silicon ash, steel fibre, carbon fiber are placed in the paraffin after heating
In pre-processed；
(3), cement, quartz sand, glass microballoon are first mixed evenly, add water and composite polycarboxylic acid water reducing agent,
Continue stirring to fluidized state, be then added and pass through pretreated miberal powder, silicon ash, steel fibre, carbon fiber, stirring to dividing completely
It dissipates, total mixing time 20min obtains superhigh intensity self-compacting concrete of the invention.
Embodiment 2
A kind of very-high performance self-compacting concrete, material component are as follows: 140 parts of cement, 70 parts of quartz sand, 20 parts of miberal powder, glass
25 parts of glass microballon, 35 parts of silicon ash, 5 parts of paraffin, 60 parts of stainless steel fibre, 10 parts of carbon fiber, 4 parts of composite polycarboxylic acid water reducing agent and water
22 parts；Stainless steel fibre diameter 0.05-0.2mm, the water-reducing rate of length 10-15mm, composite polycarboxylic acid water reducing agent reach 25%-
32%.In composite polycarboxylic acid water reducing agent, polycarboxylate water-reducer, hydroxymethyl cellulose ether, triisopropanolamine, calcium formate are respectively
3.388 parts, 0.012 part, 0.2 part, 0.4 part.
A kind of preparation method of very-high performance self-compacting concrete, the steps include:
(1), material is weighed according to said components；
(2), weighed miberal powder, silicon ash, stainless steel fibre, carbon fiber are placed in after heating by heating paraffin to melting
It is pre-processed in paraffin；
(3), cement, quartz sand, glass microballoon are first mixed evenly, add water and composite polycarboxylic acid water reducing agent,
Continue stirring to fluidized state, is then added and passes through pretreated miberal powder, silicon ash, stainless steel fibre, carbon fiber, stir to complete
Dispersion, total mixing time 20min obtain superhigh intensity self-compacting concrete of the invention.
Embodiment 3
A kind of very-high performance self-compacting concrete, material component are as follows: 90 parts of cement, 105 parts of quartz sand, 60 parts of miberal powder, glass
55 parts of glass microballon, 10 parts of silicon ash, 10 parts of paraffin, 20 parts of copper facing steel fibre, 20 parts of carbon fiber, 1.5 parts of composite polycarboxylic acid water reducing agent
With 73 parts of water；Copper plated steel fibre diameter 0.05-0.2mm, the water-reducing rate of length 10-15mm, composite polycarboxylic acid water reducing agent reach
25%-32%.In composite polycarboxylic acid water reducing agent, polycarboxylate water-reducer, hydroxymethyl cellulose ether, triisopropanolamine, calcium formate point
It Wei not be 1.1625 parts, 0.0075 part, 0.105 part, 0.225 part.
(1), material is weighed according to said components；
(2), weighed miberal powder, silicon ash, copper facing steel fibre, carbon fiber are placed in after heating by heating paraffin to melting
It is pre-processed in paraffin；
(3), cement, quartz sand, glass microballoon are first mixed evenly, add water and composite polycarboxylic acid water reducing agent,
Continue stirring to fluidized state, is then added and passes through pretreated miberal powder, silicon ash, copper facing steel fibre, carbon fiber, stir to complete
Dispersion, total mixing time 20min obtain superhigh intensity self-compacting concrete of the invention.
Embodiment 4
A kind of very-high performance self-compacting concrete, material component are as follows: 110 parts of cement, 80 parts of quartz sand, 44 parts of miberal powder, glass
40 parts of glass microballon, 10 parts of silicon ash, 7 parts of paraffin, 45 parts of copper facing steel fibre, 12 parts of carbon fiber, 3 parts of composite polycarboxylic acid water reducing agent and water
60 parts；Copper plated steel fibre diameter 0.05-0.2mm, the water-reducing rate of length 10-15mm, composite polycarboxylic acid water reducing agent reach 25%-
32%.In composite polycarboxylic acid water reducing agent, polycarboxylate water-reducer, hydroxymethyl cellulose ether, triisopropanolamine, calcium formate are respectively
2.32 parts, 0.02 part, 0.18 part, 0.48 part.
(1), material is weighed according to said components；
(2), by heating paraffin to melting, weighed miberal powder, silicon ash, metallic fiber, carbon fiber are placed in the stone after heating
It is pre-processed in wax；
(3), cement, quartz sand, glass microballoon are first mixed evenly, add water and composite polycarboxylic acid water reducing agent,
Continue stirring to fluidized state, be then added and pass through pretreated miberal powder, silicon ash, metallic fiber, carbon fiber, stirring to dividing completely
It dissipates, total mixing time 20min obtains superhigh intensity self-compacting concrete of the invention.
Embodiment 5
A kind of very-high performance self-compacting concrete, material component are as follows: 130 parts of cement, 90 parts of quartz sand, 55 parts of miberal powder, glass
48 parts of glass microballon, 28 parts of silicon ash, 9 parts of paraffin, 55 parts of stainless steel fibre, 16 parts of carbon fiber, 3.5 parts of composite polycarboxylic acid water reducing agent and
70 parts of water；Stainless steel fibre diameter 0.05-0.2mm, the water-reducing rate of length 10-15mm, composite polycarboxylic acid water reducing agent reach 25%-
32%.In composite polycarboxylic acid water reducing agent, polycarboxylate water-reducer, hydroxymethyl cellulose ether, triisopropanolamine, calcium formate are respectively
2.538 parts, 0.017 part, 0.315 part, 0.63 part.
(1), material is weighed according to said components；
(2), weighed miberal powder, silicon ash, stainless steel fibre, carbon fiber are placed in after heating by heating paraffin to melting
It is pre-processed in paraffin；
(3), cement, quartz sand, glass microballoon are first mixed evenly, add water and composite polycarboxylic acid water reducing agent,
Continue stirring to fluidized state, is then added and passes through pretreated miberal powder, silicon ash, stainless steel fibre, carbon fiber, stir to complete
Dispersion, total mixing time 20min obtain superhigh intensity self-compacting concrete of the invention.
Comparative example 1
A kind of concrete, material component are as follows: 120 parts of cement, 85 parts of quartz sand, 24 parts of silicon ash, 45 parts of steel fibre, polycarboxylic acids
2.5 parts and 37 parts of water of water-reducing agent；Steel fibre diameter 0.05-0.2mm, length 10-15mm；Water-reducing agent is that innovation day is closed in commercially available Nanjing
BTC-100 model high-performance water reducing agent.
Difference compared with Example 1 is, in the comparative example 1 and without containing miberal powder, glass microballoon, paraffin, carbon fiber,
Composite polycarboxylic acid water reducing agent, remaining component are all the same.
The preparation method of the concrete, step are as follows:
(1), material is weighed according to said components；
(2), first cement, quartz sand, silicon ash are mixed evenly, add water, polycarboxylate water-reducer continues stirring extremely
Fluidized state；Then steel fibre is added, stirring is completely dispersed to fiber, and total mixing time 20min obtains concrete.
Comparative example 2
A kind of concrete, material component are as follows: 120 parts of cement, 85 parts of quartz sand, 37 parts of miberal powder, 24 parts of glass microballoon, silicon ash
24 parts, 45 parts of steel fibre, 15 parts of carbon fiber, 2.5 parts of polycarboxylate water-reducer and 37 parts of water；Steel fibre diameter 0.05-0.2mm, it is long
Spend 10-15mm；Water-reducing agent is that innovation day BTC-100 model high-performance water reducing agent is closed in commercially available Nanjing.
Difference compared with Example 1 is, in the comparative example 2 and does not contain paraffin, composite polycarboxylic acid water reducing agent, remaining
Component is all the same.
The preparation method of the concrete, step are as follows:
(1), material is weighed according to said components；
(2), first cement, quartz sand, miberal powder, glass microballoon, silicon ash are mixed evenly, add water, polycarboxylic acids subtracts
Aqua continues stirring to fluidized state；Then steel fibre, carbon fiber is added, stirring to fiber is completely dispersed, total mixing time
20min obtains concrete.
Comparative example 3
A kind of concrete, material component are as follows: 120 parts of cement, 85 parts of quartz sand, 37 parts of miberal powder, 24 parts of glass microballoon, silicon ash
24 parts, 7 parts of paraffin, 45 parts of steel fibre, 15 parts of carbon fiber, 2.5 parts of composite polycarboxylic acid water reducing agent and 37 parts of water；Steel fibre diameter
0.05-0.2mm, length 10-15mm, the water-reducing rate of composite polycarboxylic acid water reducing agent are 25%-32%, composite polycarboxylic acid water reducing agent
In, polycarboxylate water-reducer, hydroxymethyl cellulose ether, triisopropanolamine, calcium formate be respectively 1.725 parts, 0.025 part, 0.25 part,
0.5 part.
Component is all the same compared with Example 1 for the comparative example 3, difference be in preparation method, comparative example 3 not to material into
Row pretreatment.
The preparation method of the concrete, step are as follows:
(1), material is weighed according to said components；
(2), first cement, quartz sand, miberal powder, glass microballoon, silicon ash, paraffin are mixed evenly, add water, poly- carboxylic
Sour water-reducing agent continues stirring to fluidized state；Then steel fibre, carbon fiber is added, stirring to fiber is completely dispersed, always when stirring
Between 20min, obtain concrete.
Concrete performance after the concrete mix stirred evenly in embodiment 1-5 and comparative example 1-3 and hardening is carried out
Test, test result are listed in table 1:
1 very-high performance Performance of Self-compacting Concrete index of table
From experimental result as can be seen that do not add miberal powder, glass microballoon, paraffin, carbon fiber, composite polycarboxylic acid water reducing agent and
Concrete 28 days intensity, the slumps not Jing Guo any pretreated comparative example 1 is lower, and concrete workability is general, leads to
Addition miberal powder, glass microballoon, carbon fiber are crossed, 28 days intensity of concrete, the slump are slightly promoted, and concrete workability is general, into
One step adds paraffin, composite polycarboxylic acid water reducing agent, and concrete slump significantly improves, and intensity also keeps higher level, energy within 28 days
Enough realize superhigh intensity self-compaction effect.
Specific embodiment described herein is only an example for the spirit of the invention.The neck of technology belonging to the present invention
The technical staff in domain can make various modifications or additions to the described embodiments or replace by a similar method
In generation, however, it does not deviate from the spirit of the invention or beyond the scope of the appended claims.
Claims (9)
1. a kind of very-high performance self-compacting concrete, which is characterized in that the superhigh intensity self-compacting concrete includes parts by weight
The following component of number:
Cementitious material: 90-140 parts of cement, 20-60 parts of miberal powder, 25-55 parts of glass microballoon；
Aggregate: 70-105 parts of quartz sand；
Admixture: 10-35 parts of silicon ash, 20-60 parts of metallic fiber, 5-10 parts of paraffin, 10-20 parts of carbon fiber；
Additive: 1.5-4 parts of composite polycarboxylic acid water reducing agent；
22-73 parts of water.
2. a kind of very-high performance self-compacting concrete according to claim 1, which is characterized in that the metallic fiber diameter
0.05-0.2mm, length 10-15mm.
3. a kind of very-high performance self-compacting concrete according to claim 1 or 2, which is characterized in that the metallic fiber
For one of stainless steel fibre, copper facing steel fibre, zinc-plated steel fibre or a variety of.
4. a kind of very-high performance self-compacting concrete according to claim 1, which is characterized in that the compound polycarboxylic acids subtracts
Aqua is compounded by polycarboxylate water-reducer, hydroxymethyl cellulose ether, triisopropanolamine, calcium formate.
5. a kind of very-high performance self-compacting concrete according to claim 4, which is characterized in that the polycarboxylate water-reducer
Account for the 69-84.7% of composite polycarboxylic acid water reducing agent gross mass.
6. a kind of very-high performance self-compacting concrete according to claim 4 or 5, which is characterized in that the methylol is fine
Tie up plain ether, triisopropanolamine, calcium formate three account for respectively the composite polycarboxylic acid water reducing agent gross mass 0.3-1%, 5-10%,
10-20%.
7. a kind of very-high performance self-compacting concrete according to claim 4-6 any claim, which is characterized in that institute
The water-reducing rate for stating composite polycarboxylic acid water reducing agent reaches 25-32%.
8. a kind of preparation method of very-high performance self-compacting concrete as described in claim 1, which is characterized in that the method
The following steps are included:
(1), the component of high-intensitive self-compacting concrete according to claim 1 weighs material, first extremely melts heating paraffin,
Again by miberal powder, silicon ash, metallic fiber, carbon fiber be placed in heating after paraffin in pre-process, it is spare；
(2), cement, quartz sand, glass microballoon are first mixed evenly, add water and composite polycarboxylic acid water reducing agent, continued
Then stirring is added and passes through pretreated miberal powder, silicon ash, metallic fiber, carbon fiber to fluidized state, stirring to being completely dispersed,
Obtain superhigh intensity self-compacting concrete.
9. a kind of preparation method of very-high performance self-compacting concrete according to claim 8, which is characterized in that the step
Suddenly the temporal summation stirred in (2) is 5-30min.
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| CN113636814A (en) * | 2021-08-16 | 2021-11-12 | 湖南交通职业技术学院 | Ultrahigh-performance concrete and preparation method thereof |
| CN114538843A (en) * | 2022-01-17 | 2022-05-27 | 中国电建集团西北勘测设计研究院有限公司 | Low-energy-consumption ecological type ultrahigh-performance concrete and preparation method thereof |
| CN114804706A (en) * | 2022-04-26 | 2022-07-29 | 北京金隅水泥节能科技有限公司 | Concrete additive, concrete using additive and preparation method thereof |
| CN115611565A (en) * | 2022-09-07 | 2023-01-17 | 云南筑辉建材有限公司 | Formula and preparation method of novel nano composite material UHPC |
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| CN114538843B (en) * | 2022-01-17 | 2023-01-13 | 中国电建集团西北勘测设计研究院有限公司 | Low-energy-consumption ecological type ultra-high-performance concrete and preparation method thereof |
| CN114804706A (en) * | 2022-04-26 | 2022-07-29 | 北京金隅水泥节能科技有限公司 | Concrete additive, concrete using additive and preparation method thereof |
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