CN108358563A - A kind of preparation method of lightweight aggregate concrete - Google Patents
A kind of preparation method of lightweight aggregate concrete Download PDFInfo
- Publication number
- CN108358563A CN108358563A CN201810436969.1A CN201810436969A CN108358563A CN 108358563 A CN108358563 A CN 108358563A CN 201810436969 A CN201810436969 A CN 201810436969A CN 108358563 A CN108358563 A CN 108358563A
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- Prior art keywords
- lightweight aggregate
- mineral admixture
- aggregate concrete
- concrete
- preparation
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Classifications
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/20—Resistance against chemical, physical or biological attack
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/40—Porous or lightweight materials
Abstract
The present invention provides a kind of preparation methods of lightweight aggregate concrete, including：Water, cement, sand, plastic-steel fabric, lightweight aggregate and water-reducing agent are mixed according to the match ratio of design strength grade regulation, and admixes the single mineral admixture of preset ratio or admixes the multiple mineral admixture of preset ratio, obtains lightweight aggregate concrete.Technical solution through the invention significantly reduces the chlorine ion binding capacity parameter of plastic-steel fabric lightweight aggregate concrete, improves the Anti-Chloride Ion Penetration of plastic-steel fabric lightweight aggregate concrete.
Description
Technical field
The present invention relates to building material technical fields, in particular to a kind of preparation method of lightweight aggregate concrete.
Background technology
Lightweight aggregate concrete refer to be formulated with light coarse aggregate, light weight sand (or normal sands), cement and water it is dry apparent close
Concrete of the degree no more than 1 950kg/m3.Plastic-steel fabric (polypropylene fibre) lightweight aggregate concrete is in lightweight aggregate concrete
On the basis of the advantages of mixing plastic-steel fabric, not only having maintained traditional lightweight aggregate concrete, but also have both good tension and anti-split
Fragility energy.
With the continuous development of present civil engineering technology, people except the appearance of concern reinforced concrete building, quality and
Outside economic benefit, the attention rate of reinforced concrete structure durability is also persistently increased.The corrosion of reinforcing bar can reduce building
Durability influences the service life of building, and serious threat is brought to the people's lives and property.China territory is wide, seashore
Line is very long, and saline and alkaline enrichment region is more, and winter can spray a large amount of deicer salts in the north and eliminate ice and snow, these odjective causes all make me
Major part Architectural Services Department of state is in high chloride content environment.Correlative study shows villaumite to coastal and varieties in saline-alkali areas reinforced concrete
The deterioration destruction of soil structure object is particularly acute.Lightweight aggregate concrete itself has good corrosion resistance, but in high saliferous area
In use, still there is deficiencies for its corrosion resistance.Plastic-steel fabric is added to the development that can inhibit crack in concrete, favorably
In the promotion of its resistance of chloride ion penetration, but corrosion resistance still cannot meet coastal and varieties in saline-alkali areas requirement.
Invention content
The present invention is directed to solve at least one of the technical problems existing in the prior art or related technologies.
For this purpose, the object of the present invention is to provide a kind of preparation methods of lightweight aggregate concrete.
In view of this, technical scheme of the present invention provides a kind of preparation method of lightweight aggregate concrete, including：By water,
Cement, sand, plastic-steel fabric, lightweight aggregate and water-reducing agent are mixed according to the match ratio of design strength grade regulation, and are admixed pre-
If the single mineral admixture of ratio or the multiple mineral admixture for admixing preset ratio, obtain the lightweight aggregate concrete.
Further, the single mineral admixture is flyash, silicon ash or slag.
Further, the multiple mineral admixture is：Flyash and slag answer mineral admixture, flyash and silicon ash complex ore
Polymer blends material or slag and silicon ash answer mineral admixture.
Preferably, the fibers content of the plastic-steel fabric is 0kg/m3、5kg/m3、7kg/m3、 9kg/m3Or 11kg/m3。
Preferably, the volume of the flyash is 10~30%.
Preferably, the volume of the silicon ash is 5~15%.
Preferably, the volume of the slag is 10~30%.
Preferably, it is 30% that the flyash and slag, which answer mineral admixture volume,
Preferably, it is 15~30% that the flyash and silicon ash, which answer mineral admixture volume,
Preferably, it is 15~30% that the slag and silicon ash, which answer mineral admixture volume,
Beneficial effects of the present invention are as follows：
Mineral admixture is added in concrete, and distinctive volcano ash effect promotes the life of C-S-H in hydration reaction
At reducing the Ca (OH) unfavorable to ion penetration resistance of concrete2Negative effect, improve cement mortar and transition region
Pore structure in interface.Meanwhile the distinctive secondary reaction of hydration of lightweight aggregate concrete provides for the reaction of mineral admixture
Enough moisture makes its resistance of chloride ion penetration further be promoted.Mineral admixture is added in concrete except can
Outside generation to promote C-S-H, its own also has filing effect, so as to be effectively reduced plastic-steel fabric lightweight aggregate coagulation
The chloride permeability coefficient of soil, improves its resistance of chloride ion penetration.
The additional aspect and advantage of the present invention will be set forth in part in the description, and will partly become from the following description
Obviously, or practice through the invention is recognized.
Description of the drawings
The above-mentioned and/or additional aspect and advantage of the present invention will become in the description from combination following accompanying drawings to embodiment
Obviously and it is readily appreciated that, wherein：
Fig. 1, which is shown, according to an embodiment of the invention singly mixes mineral admixture plastic-steel fabric lightweight aggregate concrete
RCM test result column comparison diagrams；
Fig. 2 shows multiple mineral admixture plastic-steel fabric lightweight aggregate concrete RCM according to an embodiment of the invention
Test result column comparison diagram.
Specific implementation mode
It is below in conjunction with the accompanying drawings and specific real in order to be more clearly understood that aforementioned aspect of the present invention, feature and advantage
Mode is applied the present invention is further described in detail.It should be noted that in the absence of conflict, the implementation of the application
Feature in example and embodiment can be combined with each other.
Many details are elaborated in the following description to facilitate a thorough understanding of the present invention, still, the present invention may be used also
To be implemented different from other modes described here using other, therefore, protection scope of the present invention is not by described below
Specific embodiment limitation.
The preparation method of lightweight aggregate concrete according to an embodiment of the invention, including：Water, cement, sand, plastic-steel is fine
Dimension, lightweight aggregate and water-reducing agent are mixed according to the match ratio of design strength grade regulation, and admix the single mine of preset ratio
Polymer blends material or the multiple mineral admixture for admixing preset ratio, obtain lightweight aggregate concrete.
In armored concrete, chlorion is the main reason for causing steel bar corrosion, and lightweight aggregate sheet is as a kind of porous material
Material, inside there is more interconnected pores, during chloride permeability, these interconnected pores can be oozed as chlorion
Saturating approach.From the microstructure angle analysis of plastic-steel fabric lightweight aggregate concrete, the resistance of chloride ion penetration of concrete is strong and weak
It is mainly related with its aggregate, cement mortar and aggregate-cement mortar and the fiber-quality at cement slurry transition region interface.
Mineral admixture is added in concrete, and distinctive volcano ash effect promotes the generation of C-S-H in hydration reaction, reduces
The Ca (OH) unfavorable to ion penetration resistance of concrete2Negative effect, improve in cement mortar and transition region interface
Pore structure.Meanwhile the distinctive secondary reaction of hydration of lightweight aggregate concrete provides enough water for the reaction of mineral admixture
Point, so that its resistance of chloride ion penetration is further promoted.Mineral admixture is added to remove in concrete and can promote C-
Outside the generation of S-H, its own also has filing effect, so as to be effectively reduced the chlorine of plastic-steel fabric lightweight aggregate concrete from
Sub- infiltration coefficient improves its resistance of chloride ion penetration.
Further, the single mineral admixture is flyash, silicon ash or slag.
Further, the multiple mineral admixture is：Flyash and slag answer mineral admixture, flyash and silicon ash complex ore
Polymer blends material or slag and silicon ash answer mineral admixture.
Compound action can be caused in concrete by mixing mineral admixture again：Volcanic ash complex effect and the compound effect of micro-aggregate
It answers.Single mineral admixture, which is added in concrete, can all cause volcano ash effect, and when mixing again, various mineral in hydration process
Admixture, which mutually stimulates, generates composite cementitious material.After hydration reaction starts, first engage in hydration reaction is clinker, water
For metaplasia at C-S-H and C-H, the gypsum in C-H and cement plays the role of stimulation to the aquation of mineral admixture.In three kinds of mines
In object admixture, the activity of silicon ash is bigger than flyash and slag, and reaction speed is fast, and contributes to the generation of C-S-H；Slag
In CaO can promote the formation of C-S-H around fly ash grain and Aft (have gypsum in the presence of), to promote flyash
The dissolving of middle aluminium, silicon phase makes aluminium and silicon concentration in aquation liquid phase increase, and can promote to increase the aquation of slag and silicon ash.
Wherein, the fibers content of the plastic-steel fabric is 0kg/m3、5kg/m3、7kg/m3、 9kg/m3Or 11kg/m3, preferably
For 9kg/m3。
Preferably, the volume of the flyash is 10~30%.
Preferably, the volume of the silicon ash is 5~15%.
Preferably, the volume of the slag is 10~30%.
Preferably, it is 30% that the flyash and slag, which answer mineral admixture volume,
Preferably, it is 15~30% that the flyash and silicon ash, which answer mineral admixture volume,
Preferably, it is 15~30% that the slag and silicon ash, which answer mineral admixture volume,
Specifically,
Raw material selection：
Cement：42.5 cement of PO of Inner Mongolia Mengxi Cement Company Limited's production, performance are shown in Table 2.1；
Table 2.1
Coarse aggregate：(1) the unburned ball-shaped pulverized-fuel-ash aggregate of the energy saving Science and Technology Co., Ltd.'s production of Chongqing sky huge rock；
Lightweight aggregate, performance are shown in Table 2.2；
Table 2.2
Fine aggregate：Packet header this real estate river sand, particles of aggregates grading is qualified, and clay content is less than 3% after flushing, fineness modulus
2.94,1 575kg/m3 of bulk density.
Plastic-steel fabric：The waveform high-performance modified polypropylene plastic-steel of Ningbo Dacheng New Material Co., Ltd's production is fine
Dimension.Plastic-steel fabric material performance index is shown in Table 2.3.
Table 2.3
Mineral admixture：The flyash that this experiment is selected comes from west of a river power plant, and slag is the granulated blast-furnace slag of Baosteel, silicon
Ash comes from Yuan Heng water-purifying materials factory of Gongyi City, and the specific performance parameter of flyash, slag is shown in Table 2.4, the specific performance ginseng of silicon ash
Number is shown in Table 2.5.
Table 2.4
Table 2.5
It is ordinary tap water with water, water-reducing agent is polycarboxylate water-reducer, and water-reducing rate is 45% testing program
The suggestion that concrete is provided according to producer, the concrete based on 9kg/m3 fibers contents is provided with light in the present embodiment
Aggregate type, concrete strength and aggregate influence factor, wherein lightweight aggregate type select pulverized-fuel-ash aggregate, the ratio of mud to select
0.45,0.35,0.32 3 kind, on this basis, mineral admixture is mixed, is powder respectively wherein selecting three kinds of mineral admixtures
Coal ash, slag and silicon ash.
The measurement reference of the Anti-Chloride Ion Penetration of plastic-steel fabric lightweight aggregate concrete《Normal concrete long-term behaviour and
Endurance quality test method standard》(GB-T50082-2009) the quick chloride ion transport Y-factor method Y in [61] measures (RCM methods),
Chloride diffusion coefficient calculates as follows：
In formula：DRCM--- concrete unstable state chloride diffusion coefficient (× 10-12m2/s)；
U --- applied voltage absolute value (V), this experiment are constant pressure 30V using voltage；
The initial temperature of T --- anodic dissolution and the average value (DEG C) of end temp；
L --- thickness of sample (mm)；
Xd--- the average value (mm) of chloride permeability depth；
T --- test period (h).
Mix-design
The proportioning reference of plastic-steel fabric lightweight aggregate concrete《Light aggregate concrete technical regulation》 (JGJ51-2002)[1]In
Loose media area method matched.Not plus the proportioning of the lightweight aggregate concrete of plastic-steel fabric is shown in Table 2.7.
Table 2.7
Sample making
The present embodiment reference《Fiber concrete test method》(CECS13-2009)[62]It is mixed to carry out plastic-steel fabric lightweight aggregate
The preparation of soil is coagulated, specific preparation process is as follows：
Lightweight aggregate used is subjected to pre-wetted treatment in advance when the pre- wet test of aggregate, and measures its water absorption rate.For clear water
The aggregate prewetted dries the water of aggregate surface after it is prewetted, for the aggregate that mineral admixture slurry is prewetted, pre-
It is stood after wet, when use takes the surface drying aggregate on top to carry out the preparation of plastic-steel fabric lightweight aggregate concrete.
The cement mortar of the ratio of mud identical as proportioning is first used to carry out hanging processing to blender before stirring molding stirring, by thing
The first die trial brushing mineral grease of ready 150mm × 150mm × 150mm.Start to press lightweight aggregate, sand and cement when stirring
It weighs to pour into according to set proportioning and stirs 1min in forced stirrer, then plastic-steel fabric is uniformly added to and to be stirred evenly
Stir 1min in mixing species, after mixture stirs evenly, water and water-reducing agent be added, be stirred for 2min, it is die-filling after by sample
It is placed on shake table vibrations 30s, smoothes out form removal label after standing at ambient temperature for 24 hours later.
Sample conserves and processed sample is put into Water in Water Tanks after form removal and supports 7d, then takes out sample and uses core drilling machine by sample
Product are processed into the cylinder of φ 100 × 150, the cylinder that sample is processed into φ 100 × 50 by building stones factory are sent to later, finally by sample
Product are put into the foster case of water and are conserved to 28d.
Mineral admixture is incorporated into according to different addition quantity in plastic-steel fabric lightweight aggregate concrete, RCM concrete chlorine is passed through
Ionic diffusion coefficient analyzer measures its chloride diffusion coefficient, the results are shown in Table 4.1 after handling measurement result.
Table 4.1
Fig. 1 is singly to mix mineral admixture plastic-steel fabric lightweight aggregate concrete RCM test result column comparison diagrams, can by figure
Know, the chloride permeability coefficient of plastic-steel fabric lightweight aggregate concrete can be effectively reduced after addition mineral admixture, improves it
Resistance of chloride ion penetration, and the performance of silicon ash is best in three kinds of mineral admixtures.Mix the plastic-steel fabric lightweight aggregate coagulation of silicon ash
The diffusion coefficient of soil is with the increase first increases and then decreases of volume, optimum adding quantity of pulverized 10%, concrete diffusion coefficient drop at this time
Low 71.1%
From the microstructure angle analysis of plastic-steel fabric lightweight aggregate concrete, the resistance of chloride ion penetration power master of concrete
It is related with its aggregate, cement mortar and aggregate-cement mortar and the fiber-quality at cement slurry transition region interface.Mine
Object admixture is added in concrete, and distinctive volcano ash effect promotes the generation of C-S-H in hydration reaction, is reduced pair
The negative effect of the unfavorable Ca of ion penetration resistance of concrete (OH) 2, improves the hole in cement mortar and transition region interface
Gap structure.Meanwhile the distinctive secondary reaction of hydration of lightweight aggregate concrete provides enough moisture for the reaction of mineral admixture,
Its resistance of chloride ion penetration is set further to be promoted.Mineral admixture is added to remove in concrete and can promote C-S-H
Generation outside, its own also have filing effect.Compared to flyash and slag, silicon ash has the ratio of smaller grain size and bigger
Surface area.It can more preferably and more fully be filled into the hole between hydrated product and cement granules during hydration reaction
In gap, so that concrete is become more fine and close, achieve the effect that optimize pore structure, but when compared with large dosage can make inside it
Excessive microcrack is generated, its resistance of chloride ion penetration is influenced.
Multiple mineral admixture is incorporated into according to different addition quantity in plastic-steel fabric lightweight aggregate concrete, the present embodiment chooses 9
The multiple mineral admixture of group carries out RCM tests, and test result is shown in Table shown in 4.2, and column comparison diagram is as shown in Figure 2.
Table 4.2
9 kinds are compared by table 4.2 to mix influence of the mode to the diffusion coefficient of plastic-steel fabric lightweight aggregate concrete again and can obtain, 9
Kind mixes mode again has the diffusion coefficient of plastic-steel fabric lightweight aggregate concrete the effect of reduction, wherein to plastic-steel fabric lightweight aggregate
It is that answering for Sa20Si10 samples mixes method that the resistance of chloride ion penetration of concrete, which improves maximum, i.e. fine slag contents 20%, silicon ash
Volume 10%, infiltration coefficient reduces 73.2%.
Compound action can be caused in concrete by mixing mineral admixture again：Volcanic ash complex effect and the compound effect of micro-aggregate
It answers.Single mineral admixture, which is added in concrete, can all cause volcano ash effect, and when mixing again, various mineral in hydration process
Admixture, which mutually stimulates, generates composite cementitious material.After hydration reaction starts, first engage in hydration reaction is clinker, water
For metaplasia at C-S-H and C-H, the gypsum in C-H and cement plays the role of stimulation to the aquation of mineral admixture.In three kinds of mines
In object admixture, the activity of silicon ash is bigger than flyash and slag, and reaction speed is fast, and contributes to the generation of C-S-H；Slag
In CaO can promote the formation of C-S-H around fly ash grain and Aft (have gypsum in the presence of), to promote flyash
The dissolving of middle aluminium, silicon phase makes aluminium and silicon concentration in aquation liquid phase increase, and can promote to increase the aquation of slag and silicon ash.
The performance of concrete and the stacking states of cementitious material have close relationship.The gel particles of different-grain diameter can be with
Mutually filling so that the cementitious material of concrete is more closely knit.Particle size is followed successively by cementitious material：Cement>Fine coal
Ash>Slag>Silicon ash, rational cementitious material proportioning can make cementitious material possess good continuous grading, to reduce coagulation
The overall porosity of soil, improves the resistance of chloride ion penetration of concrete.
Above in association with technical scheme of the present invention has been illustrated, technical solution through the invention is default by admixing
The concrete that the single mineral admixture of ratio or the multiple mineral admixture for admixing preset ratio obtain, significantly reduces modeling
The chlorine ion binding capacity parameter of steel fiber reinforced expansive concrete, improves the resistance of chloride ion penetration of plastic-steel fabric lightweight aggregate concrete
Energy.
In the description of this specification, the description of term " one embodiment ", " some embodiments ", " specific embodiment " etc.
Mean that particular features, structures, materials, or characteristics described in conjunction with this embodiment or example are contained at least one reality of the present invention
It applies in example or example.In the present specification, schematic expression of the above terms are not necessarily referring to identical embodiment or reality
Example.Moreover, description particular features, structures, materials, or characteristics can in any one or more of the embodiments or examples with
Suitable mode combines.
The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention, for the skill of this field
For art personnel, the invention may be variously modified and varied.All within the spirits and principles of the present invention, any made by repair
Change, equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (10)
1. a kind of preparation method of lightweight aggregate concrete, which is characterized in that including：
Water, cement, sand, plastic-steel fabric, lightweight aggregate and water-reducing agent are mixed according to the match ratio of design strength grade regulation,
And admix the single mineral admixture of preset ratio or admix the multiple mineral admixture of preset ratio, it is mixed to obtain the lightweight aggregate
Solidifying soil.
2. the preparation method of lightweight aggregate concrete according to claim 1, which is characterized in that the single mineral admixture
For flyash, silicon ash or slag.
3. the preparation method of lightweight aggregate concrete according to claim 1, which is characterized in that the multiple mineral admixture
For：Flyash and slag answer that mineral admixture, flyash and silicon ash answer mineral admixture or slag and silicon ash answers mineral admixture.
4. the preparation method of lightweight aggregate concrete according to claim 1, which is characterized in that the fiber of the plastic-steel fabric
Volume is 0kg/m3、5kg/m3、7kg/m3、9kg/m3Or 11kg/m3。
5. the preparation method of lightweight aggregate concrete according to claim 1, which is characterized in that the volume of the flyash is
10~30%.
6. the preparation method of lightweight aggregate concrete according to claim 1, which is characterized in that the volume of the silicon ash is 5
~15%.
7. the preparation method of lightweight aggregate concrete according to claim 1, which is characterized in that the volume of the slag is 10
~30%.
8. the preparation method of lightweight aggregate concrete according to claim 1, which is characterized in that the flyash and slag are multiple
Mineral admixture volume is 30%.
9. the preparation method of lightweight aggregate concrete according to claim 1, which is characterized in that the flyash and silicon ash are multiple
Mineral admixture volume is 15~30%.
10. the preparation method of lightweight aggregate concrete according to claim 1, which is characterized in that the slag and silicon ash are multiple
Mineral admixture volume is 15~30%.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110922118A (en) * | 2019-12-20 | 2020-03-27 | 汝州市东江建筑工业科技有限公司 | All-light high-strength concrete for assembled components and preparation method thereof |
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Application publication date: 20180803 |