CN110316989A - Concrete coarse aggregate of carbon fiber and preparation method thereof is wrapped up in outside a kind of - Google Patents
Concrete coarse aggregate of carbon fiber and preparation method thereof is wrapped up in outside a kind of Download PDFInfo
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- CN110316989A CN110316989A CN201910625131.1A CN201910625131A CN110316989A CN 110316989 A CN110316989 A CN 110316989A CN 201910625131 A CN201910625131 A CN 201910625131A CN 110316989 A CN110316989 A CN 110316989A
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- Prior art keywords
- stone
- carbon fiber
- aggregate
- concrete
- coarse aggregate
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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
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/10—Coating or impregnating
- C04B20/12—Multiple coating or impregnating
Abstract
Of the present invention is that concrete coarse aggregate of carbon fiber and preparation method thereof is wrapped up in outside one kind, it include: stone aggregate, one layer of adhesive of the package on stone aggregate surface, the cement paste wrapped up outside adhesive, the carbon fiber of distribution at random in adhesive and cement paste.The reason for causing concrete easy to crack is that the interface compactness between Behavior of Hardened Cement Paste and coarse aggregate is low, porosity with higher, hydrated cementitious generate a large amount of particle sizes are larger and the CH crystal of oriented growth cause gather materials-slurry interface cohesive force is weaker.By wrapping up in slurry processing to coarse aggregate, the interface in concrete between Behavior of Hardened Cement Paste and coarse aggregate can be made more closely knit, bond strength greatly increases, and the addition of carbon fiber can also increase the flexural capacity of concrete, so that concrete be made to have better deformability.
Description
Technical field
The present invention relates to a kind of modification of concrete coarse aggregate, it is able to ascend the boundary of coarse aggregate and cement mortar in concrete
The physical property and endurance quality of concrete structure can be improved in face bond effect.
Background technique
Concrete is current most popular construction material, although concrete has compression strength height, abundant raw materials,
And cheap, the advantages that being simple to manufacture, but it restricts concrete knot the disadvantages of great, brittleness is high, deformability is poor
The development of structure.Especially the flexural strength of concrete is easy to happen out concrete in use well below its compression strength
It splits, reduces concrete strength, internal reinforcing bar is exposed to be corroded, and the service life of concrete has been seriously affected.
Causing the reason that concrete is easy to crack, deformability is poor is that interfacial adhesion between cement slurry and coarse aggregate stone is strong
It spends not high.This is because be the region of a high water-cement ratio around aggregate in concrete, and cement granules react after from
Son is easy to be diffused into this region.Since the compactness in the region is low, porosity with higher, what hydrated cementitious generated
A large amount of CH crystal have enough spaces to be grown, these CH crystal in transition region are than CH crystal generated in the base
Particle size is big and feature with oriented growth, thus cause gather materials-slurry interface cohesive force is weaker so that concrete
When by load, interfacial adhesion part takes the lead in separating, and stress is caused to concentrate, and finally destroys concrete structure.Institute
Become object concerned by people how to improve the intensity of the interfacial transition zone in concrete between cement mortar and coarse aggregate.
In recent years, aggregate wraps up in slurry processing technique and gets more and more people's extensive concerning.Pass through wrapping up at slurry to coarse aggregate
Reason, so that the interface bond strength in concrete between Behavior of Hardened Cement Paste and coarse aggregate greatly increases, extends the military service longevity of concrete
Life.But most of researchs are the package of the progress cement paste simple to coarse aggregate or the package of cement mortar, and it is right
The research that fiber is wrapped up in outside concrete coarse aggregate is seldom, although only wrapping up coarse aggregate cement paste or mortar can effectively improve
The compression strength of concrete, but it is less to the increase of the flexural strength of concrete, so can to carbon fiber is wrapped up in outside concrete coarse aggregate
To overcome this disadvantage, to make concrete that there is better deformability.
Summary of the invention
The purpose of the present invention is intended to provide outside one kind and wraps up in concrete coarse aggregate of carbon fiber and preparation method thereof, is able to ascend
The interfacial adhesion effect of coarse aggregate and Behavior of Hardened Cement Paste in concrete, to improve the physical property and endurance quality of concrete structure.
The present invention adopts the following technical scheme:
One kind of the present invention is outer to wrap up in concrete coarse aggregate of carbon fiber and preparation method thereof, comprising: stone aggregate, stone bone
Expect that one layer of adhesive of the package on surface, the cement paste wrapped up outside adhesive are at random in adhesive and cement paste
The carbon fiber of distribution.
One kind of the present invention is outer to wrap up in concrete coarse aggregate of carbon fiber and preparation method thereof, and preparation step is as follows:
Step 1: it selects general blinding as coarse aggregate, cleaning is carried out to it and is dried, makes its clay content less than 0.5%, to protect
The adhesion strength between cement slurry and aggregate is demonstrate,proved, cobble-stone diameter is between 5~25mm；Step 2: the drying in step 1 is taken
Stone, and the carbon fiber of stone quality 0.4% is weighed, prepare organic adhesion agent, stone is placed in organic adhesion agent, excessively 1~
Stone is taken out after 3 minutes, at this moment stone surface has sticked adhesive internal layer of a layer thickness between 0.1~0.2mm, so
Carbon fiber is uniformly sprinkling upon afterwards on the stone with adhesive, hangs adhesive after a hour and solidify, carbon fiber has been at this time
Firmly it is sticked on stone；Step 3: preparing the cement paste containing methylcellulose, the stone leaching after drying in step 2
Bubble is in cement paste, and the soaking time of aggregate is 20min, first five minute is stirred and shakes, to ensure the sky in aggregate
Gas being excluded as far as possible enables being wrapped on stone for the fine and close consolidation of slurries.Stone is taken out after the completion of impregnating, and is placed in standard and is supported
Shield conserves 24 hours in room；Step 4: taking out stone and be again placed in cement paste and impregnate 20min after maintenance, first five minute into
Row stirring and vibration, conserve 24 hours again after the completion, this is because stone face directed downwardly is different when wrapping up cement paste twice,
To prevent aggregate surface slurries to form the wrapping layer of uneven thickness due to gravity, slurry effect is wrapped up in influence.Water at this time
Cement paste with a thickness of 0.8~1.2mm.Slurry stone of wrapping up in after conserving 24 hours is put into polybag, it is ensured that does not have quality
Quality outside loss and empirical factor increases.All aggregates are put into after being conserved 28 days in concrete standard fog room, can be obtained
Slurry aggregate is wrapped up in what be can be used.
The stone is common lime stone rubble, and nominal particle diameter is the continuous grading of 5-25mm, and clay content is less than 1%, needle
Sheet-like particle content is less than 5%, and crush index is less than 10%, and continuous grading loosely-packed porosity is less than 43%.
The organic adhesion agent is epoxy resin or polyvinyl acetate latex.
The carbon fiber is PAN base chopped carbon fiber, and the length is 6mm, diameter is 7 μm, elasticity modulus is 210~
230GPa, density 1.8g/cm3。
The ratio of mud of the cement paste is 0.7, and the cement used is 42.5 cement of normal silicate.The methyl used
Cellulose viscosity is 40000mPa.s, and volume is the 0.5% of cement quality.The purpose is to increase the viscosity of cement paste, Neng Gouyou
Effect prevents the carbon fiber being sticked on adhesive layer from gathering into bundles.
One kind of the present invention is outer to wrap up in concrete coarse aggregate of carbon fiber and preparation method thereof, compared with prior art,
Have the advantage that the modified coarse aggregate of the present invention has crude physical surface, the material composi and water of superficial layer
Mudstone ingredient is close, greatly improves the compatibility between Behavior of Hardened Cement Paste and stone.Slurry technology, carbon fiber are wrapped up in relative to traditional
Addition further increase the tensile capacity of interfacial transition zone, it is strong to improve Behavior of Hardened Cement Paste and the bonding at aggregate interface in concrete
Degree, effectively increases the compactness, compression strength, flexural strength, durability of concrete after concrete finished product is made.Using this
The 28 days compression strength of concrete that the preparation of slurry technology is wrapped up in invention improves 44.7%, and flexural strength improves 31.5%；Pass through heat analysis
The CH for showing that interfacial transition zone generates is substantially reduced, and C-S-H gel dramatically increases；Concrete scanning electron microscope the result shows that, and it is general
The interface of logical concrete is compared, and the density at the new interface of the modified concrete of aggregate is preferable；Element in power spectrum is quantified
Analysis, the Si element and Ca element specific gravity in regeneration concrete interface area reduce, and show the modified richness for reducing calcium hydroxide of aggregate
Collection, generates more gels and entringite, enhances the interface binding power of concrete.
Detailed description of the invention
Below in conjunction with attached drawing, invention is further described in detail.
Fig. 1 is the schematic diagram that carbon fiber is wrapped up in outside a kind of concrete coarse aggregate of the present invention.
The corresponding title of label is respectively as follows: 1, coarse aggregate in Fig. 1；2, carbon fiber；3, organic adhesion agent internal layer；4, cement is net
Pulp layer.
Specific embodiment
The present invention is further illustrated below in conjunction with specific embodiment, the embodiment of the present invention is used to explain the present invention,
But it is not as a limitation of the invention.
Embodiment 1
Of the present invention is that concrete coarse aggregate of carbon fiber and preparation method thereof is wrapped up in outside one kind, comprising: stone aggregate, stone
One layer of adhesive of the package of aggregate surface, the cement paste wrapped up outside adhesive dissipate in adhesive and cement paste
The carbon fiber being disorderly distributed.
One kind of the present invention is outer to wrap up in concrete coarse aggregate of carbon fiber and preparation method thereof, and preparation step is as follows:
Step 1: selecting general blinding, and cleaning is carried out to it and is dried, makes its clay content less than 0.5%, to guarantee cement slurry
Adhesion strength between aggregate, cobble-stone diameter is between 5~25mm；Step 2: the drying stone in step 1 is taken, and is claimed
The carbon fiber of stone quality 0.4% is taken, prepares organic adhesion agent, stone is placed in organic adhesion agent, is taken out after spending 1~3 minute
Stone, at this moment stone surface has sticked adhesive internal layer of a layer thickness between 0.1~0.2mm, then by carbon fiber
It is uniformly sprinkling upon on the stone with adhesive, adhesive solidifies after hanging a hour, and carbon fiber is firmly sticked at this time
On stone；Step 3: prepare the cement paste containing methylcellulose, it is net that the stone after drying in step 2 is immersed in cement
In slurry, the soaking time of aggregate is 20min, first five minute is stirred and shakes, to ensure the quilt of the air in aggregate as far as possible
It excludes, enables being wrapped on stone for the fine and close consolidation of slurries, take out stone after the completion of impregnating, be placed in standard curing room and conserve
24 hours；Step 4: stone is taken out after maintenance and is again placed in cement paste and impregnates 20min, first five minute is stirred and shakes
It is dynamic, it conserves 24 hours again after the completion, this is because stone face directed downwardly is different when wrapping up cement paste twice, to prevent
Aggregate surface slurries form the wrapping layer of uneven thickness due to gravity, and slurry effect is wrapped up in influence.The thickness of cement paste at this time
Degree is 0.8~1.2mm.Slurry stone of wrapping up in after conserving 24 hours is put into polybag, it is ensured that does not have mass loss and experiment
Quality outside factor increases, and all aggregates is put into after conserving 28 days in concrete standard fog room, can be obtained can be used
Wrap up in slurry aggregate.
The stone is common lime stone rubble, and nominal particle diameter is the continuous grading of 5-25mm, and clay content is less than 1%, needle
Sheet-like particle content is less than 5% crush index less than 10%, and continuous grading loosely-packed porosity is less than 43%.
The organic adhesion agent is epoxy resin or polyvinyl acetate latex.
The carbon fiber is PAN base chopped carbon fiber, and the length is 6mm, diameter is 7 μm, elasticity modulus is 210~
230GPa, density 1.8g/cm3。
The ratio of mud of the cement paste is 0.7, and the cement used is 42.5 cement of normal silicate.The methyl used
Cellulose viscosity is that 40000mPa.s can effectively prevent being sticked on adhesive layer the purpose is to increase the viscosity of cement paste
Carbon fiber gathers into bundles.
39 parts of water intaking, 93 parts of 42.5 cement of normal silicate, wrap up in 213 parts of aggregate of slurry, polycarboxylic acids is efficient by 126 parts of fine aggregate
It 1.5 parts of water-reducing agent, is added in blender after mixing, concrete to be formed can be obtained after stirring 2~4min.It will molding
Concrete conserved 28 days under standard curing environment after test its performance, discovery compression strength is promoted relative to slurry aggregate is not wrapped up in
42.6%, flexural strength improves 33.7%.
Embodiment 2
Repeat embodiment 1, be with 1 difference of embodiment: carbon fiber dosage described in the present embodiment is the 0.5% of stone quality, institute
The cement paste ratio of mud is 0.8.Other wrap up in slurry aggregate preparation method referring to embodiment 1.
42 parts of water intaking, 97 parts of 42.5 cement of normal silicate, wrap up in 208 parts of aggregate of slurry, polycarboxylic acids is efficient by 119 parts of fine aggregate
It 1.3 parts of water-reducing agent, is added in blender after mixing, concrete to be formed can be obtained after stirring 2~4min.It will molding
Concrete conserved 28 days under standard curing environment after test its performance, discovery compression strength is promoted relative to slurry aggregate is not wrapped up in
44.8%, flexural strength improves 34.5%.
Embodiment 3
Repeat embodiment 1, be with 1 difference of embodiment: carbon fiber dosage described in the present embodiment is the 0.3% of stone quality, institute
The cement paste ratio of mud is 0.6.Other wrap up in slurry aggregate preparation method referring to embodiment 1.
41 parts of water intaking, 92 parts of 42.5 cement of normal silicate, wrap up in 216 parts of aggregate of slurry, polycarboxylic acids is efficient by 121 parts of fine aggregate
It 1.1 parts of water-reducing agent, is added in blender after mixing, concrete to be formed can be obtained after stirring 2~4min.It will molding
Concrete conserved 28 days under standard curing environment after test its performance, discovery compression strength is promoted relative to slurry aggregate is not wrapped up in
41.5%, flexural strength improves 31.8%.
Those skilled in the art is not under conditions of departing from the spirit and scope of the present invention that claims determine, also
Various modifications can be carried out to the above content.Therefore the scope of the present invention is not limited in above explanation, but by
The range of claims determines.All within the spirits and principles of the present invention, made any modification, equivalent replacement,
Improve etc., it should all be included in the protection scope of the present invention.
Claims (7)
1. wrapping up in concrete coarse aggregate of carbon fiber and preparation method thereof outside a kind of, it is characterised in that be made of following six part:
Coarse aggregate, organic adhesion agent, carbon fiber, cement, water, methylcellulose.
2. of the present invention is to wrap up in concrete coarse aggregate of carbon fiber and preparation method thereof outside one kind, comprising: stone aggregate, stone
One layer of adhesive of the package of sub- aggregate surface, the cement paste wrapped up outside adhesive, in adhesive and cement paste
The carbon fiber of distribution at random.
3. one kind according to claim 1 is outer to wrap up in concrete coarse aggregate of carbon fiber and preparation method thereof, feature exists
In, comprising the following steps: step 1: selects general blinding as coarse aggregate, cleaning is carried out to it and is dried, its clay content is made
Less than 0.5%, to guarantee the adhesion strength between cement slurry and aggregate, cobble-stone diameter is between 5~25mm；Step 2: step is taken
Drying stone in rapid one, and the carbon fiber of stone quality 0.4% is weighed, prepare organic adhesion agent, stone is placed in organic gel
In stick, stone is taken out after spending 1~3 minute, at this moment stone surface has sticked glue of a layer thickness between 0.1~0.2mm
Then carbon fiber is uniformly sprinkling upon on the stone with adhesive by stick internal layer, adhesive solidifies after hanging a hour, at this time
Carbon fiber is firmly sticked on stone；Step 3: prepare the cement paste containing methylcellulose, will be dried in step 2
Stone afterwards is immersed in cement paste, and the soaking time of aggregate is 20min, first five minute is stirred and shakes, to ensure
Air in aggregate being excluded as far as possible, enables being wrapped on stone for the fine and close consolidation of slurries, takes out stone after the completion of impregnating,
It is placed in standard curing room and conserves 24 hours；Step 4: stone is taken out after maintenance and is again placed in the cement containing methylcellulose
20min is impregnated in net slurry, first five minute is stirred and shakes, and conserves 24 hours again after the completion, this is because wrapping up twice
Stone face directed downwardly is different when cement paste, so that aggregate surface slurries be prevented to form uneven thickness due to gravity
Slurry effect is wrapped up in wrapping layer, influence, at this time cement paste with a thickness of 0.8~1.2mm, the slurry stone wrapped up in after conserving 24 hours is put
Enter in polybag, it is ensured that the quality not having outside mass loss and empirical factor increases, and all aggregates are put into concrete standard
After being conserved 28 days in fog room, can be obtained can be used wrap up in slurry aggregate.
4. one kind according to claim 3 is outer to wrap up in concrete coarse aggregate of carbon fiber and preparation method thereof, it is characterised in that
The stone of step 1 is common lime stone rubble, and nominal particle diameter is the continuous grading of 5-25mm, and clay content is less than 1%, gill shape
Grain content is less than 5%, and crush index is less than 10%, and continuous grading loosely-packed porosity is less than 43%.
5. one kind according to claim 3 is outer to wrap up in concrete coarse aggregate of carbon fiber and preparation method thereof, it is characterised in that
Organic adhesion agent described in step 2 is epoxy resin or polyvinyl acetate latex.
6. one kind according to claim 3 is outer to wrap up in concrete coarse aggregate of carbon fiber and preparation method thereof, it is characterised in that
Carbon fiber described in step 2 is PAN base chopped carbon fiber, and the length is 6mm, diameter is 7 μm, elasticity modulus is 210~
230GPa, density 1.8g/cm3。
7. one kind according to claim 3 is outer to wrap up in concrete coarse aggregate of carbon fiber and preparation method thereof, it is characterised in that
The ratio of mud of cement paste described in step 3 and step 4 is 0.7, and the cement used is 42.5 cement of normal silicate, is used
Methylcellulose viscosity is 40000mPa.s, and volume is the 0.5% of cement quality, and the purpose is to increase the viscosity of cement paste, energy
Enough it effectively prevent the carbon fiber being sticked on adhesive layer to gather into bundles.
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| CN201910625131.1A CN110316989A (en) | 2019-07-11 | 2019-07-11 | Concrete coarse aggregate of carbon fiber and preparation method thereof is wrapped up in outside a kind of |
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| CN201910625131.1A CN110316989A (en) | 2019-07-11 | 2019-07-11 | Concrete coarse aggregate of carbon fiber and preparation method thereof is wrapped up in outside a kind of |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111410471A (en) * | 2019-11-16 | 2020-07-14 | 中国铁道科学研究院集团有限公司铁道建筑研究所 | Large-flow-state high-strength lightweight aggregate concrete and preparation method thereof |
| CN112479616A (en) * | 2020-11-23 | 2021-03-12 | 湖南大学 | Recycled coarse aggregate wrapped with powder and preparation method thereof |
| CN112897941A (en) * | 2021-03-24 | 2021-06-04 | 太原理工大学 | Plant fiber reinforcement method for coal mine cemented filling material aiming at interface transition region |
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| CN101863631A (en) * | 2010-06-21 | 2010-10-20 | 东南大学 | Stone aggregate wrapped by microfine fibre polymer mortar thin layer and preparation method thereof |
| CN108373282A (en) * | 2018-03-19 | 2018-08-07 | 济南大学 | A kind of preparation method of active aggregates |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2004089847A1 (en) * | 2003-04-11 | 2004-10-21 | Durisol-Raalte B.V. | Fire-insulating wall covering and a preparation method for same |
| CN101863631A (en) * | 2010-06-21 | 2010-10-20 | 东南大学 | Stone aggregate wrapped by microfine fibre polymer mortar thin layer and preparation method thereof |
| CN108373282A (en) * | 2018-03-19 | 2018-08-07 | 济南大学 | A kind of preparation method of active aggregates |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111410471A (en) * | 2019-11-16 | 2020-07-14 | 中国铁道科学研究院集团有限公司铁道建筑研究所 | Large-flow-state high-strength lightweight aggregate concrete and preparation method thereof |
| CN111410471B (en) * | 2019-11-16 | 2022-07-29 | 中国铁道科学研究院集团有限公司铁道建筑研究所 | Large-flow-state high-strength lightweight aggregate concrete and preparation method thereof |
| CN112479616A (en) * | 2020-11-23 | 2021-03-12 | 湖南大学 | Recycled coarse aggregate wrapped with powder and preparation method thereof |
| CN112897941A (en) * | 2021-03-24 | 2021-06-04 | 太原理工大学 | Plant fiber reinforcement method for coal mine cemented filling material aiming at interface transition region |
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Application publication date: 20191011 |