CN104944856B - A kind of regeneration concrete method for preparing stability - Google Patents
A kind of regeneration concrete method for preparing stability Download PDFInfo
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- CN104944856B CN104944856B CN201510338992.3A CN201510338992A CN104944856B CN 104944856 B CN104944856 B CN 104944856B CN 201510338992 A CN201510338992 A CN 201510338992A CN 104944856 B CN104944856 B CN 104944856B
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- 238000003756 stirring Methods 0.000 claims abstract description 20
- 239000002956 ash Substances 0.000 claims abstract description 18
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 16
- 239000004568 cement Substances 0.000 claims abstract description 10
- 238000007580 dry-mixing Methods 0.000 claims abstract description 7
- 239000010881 fly ash Substances 0.000 claims abstract description 6
- 238000012216 screening Methods 0.000 claims description 3
- 239000008187 granular material Substances 0.000 claims description 2
- 238000010521 absorption reaction Methods 0.000 abstract description 29
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- NIPNSKYNPDTRPC-UHFFFAOYSA-N N-[2-oxo-2-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)ethyl]-2-[[3-(trifluoromethoxy)phenyl]methylamino]pyrimidine-5-carboxamide Chemical compound O=C(CNC(=O)C=1C=NC(=NC=1)NCC1=CC(=CC=C1)OC(F)(F)F)N1CC2=C(CC1)NN=N2 NIPNSKYNPDTRPC-UHFFFAOYSA-N 0.000 description 1
- KKCBUQHMOMHUOY-UHFFFAOYSA-N Na2O Inorganic materials [O-2].[Na+].[Na+] KKCBUQHMOMHUOY-UHFFFAOYSA-N 0.000 description 1
- 239000011398 Portland cement Substances 0.000 description 1
- 235000010891 Ptelea trifoliata Nutrition 0.000 description 1
- 241001092391 Sorbus Species 0.000 description 1
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- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
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- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 238000011068 loading method Methods 0.000 description 1
- 239000010721 machine oil Substances 0.000 description 1
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- DGVVJWXRCWCCOD-UHFFFAOYSA-N naphthalene;hydrate Chemical compound O.C1=CC=CC2=CC=CC=C21 DGVVJWXRCWCCOD-UHFFFAOYSA-N 0.000 description 1
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Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Landscapes
- Curing Cements, Concrete, And Artificial Stone (AREA)
- Preparation Of Clay, And Manufacture Of Mixtures Containing Clay Or Cement (AREA)
Abstract
The invention discloses a kind of regeneration concrete method for preparing stability, the method is comprised the following steps：Step 1)：Prepare combination coarse aggregate；Step 2)：Combination coarse aggregate, cement, fine aggregate, 10~35% volcanic ash or flyash are fed intake successively, dry mixing 20~30 seconds is to uniform, the water reducer of 1/2 water consumption and 0.5%~1.5% percentage by weight is added to stir 20~30 seconds to uniform, add remaining 1/2 water consumption to stir 60~120 seconds to uniform, be made regeneration concrete.The present invention makes full use of the principle of different-grain diameter aggregate effect in concrete, take the characteristics such as water absorption rate, the cement mortar of bonding, defect and the crack of regeneration aggregate into consideration, using the big particle diameter regeneration aggregate of low water absorption, quality except improving combination coarse aggregate, thoroughly overcomes the low intensity and discrete problem of substitution rate regeneration concrete high.
Description
Technical field
The present invention relates to a kind of regeneration concrete method for preparing stability, belong to architectural engineering concrete technology of preparing
Field.
Background technology
With the fast development of civil engineering, the dismounting of concrete structure and renewal and reform produce substantial amounts of discarded coagulation
Soil.Recycled concrete can fundamentally solve the problem of outlet of discarded concrete, can mitigate discarded concrete to ring
The pollution in border, can save natural aggregate resources, the consumption alleviated aggregate disparities between supply and demand, reduce natural resources and the energy again, have
Significant society, economy and environmental benefit.Regeneration concrete technology of preparing is difficult to, in field of civil engineering interior popularization on a large scale, ask
Topic is：If regeneration aggregate content is high, concrete strength is too low, and service behaviour is low；To improve concrete strength, if reduced
The content of regeneration aggregate, intensity discreteness is very big；If using high-effect binding agent or the regeneration aggregate of retrofit, into
Ben Taigao.Therefore it is simple to use for reference the regeneration concrete that conventional concrete preparation method is difficult to prepare stability.
The regeneration concrete good to obtain service behaviour, improves the mechanical properties such as its intensity and stability, increases contained
Regeneration aggregate mass percent, domestic scholars are typically resolved by adjusting the match ratio and mixing method of concrete.At present
Known preparation method of concrete includes four kinds：
The first substitution method, i.e., with etc. quality or isometric principle regeneration aggregate replace natural in conventional concrete
The method of aggregate prepares regeneration concrete.A kind of method for Deng mass method being the most frequently used and most commonly using, equi-volume process passes through
Measurement can also be used.For the method for single use regeneration aggregate replacement natural aggregate, by replacement rate and regeneration concrete
Relationship between Mechanical determine critical percentage, due to regeneration aggregate source and quality it cannot be guaranteed that, aggregate substitution rate improve have
Limit, the strength stability of regeneration concrete is poor.
Second particle shaping method, i.e., by mechanical crushing method, conventional heating methods, heating grinding method, the acid-hatching of young eggs and chemistry
Method smashing waste concrete, repairs aggregate shape, reduces the regeneration aggregate that water absorption rate prepares high-quality.Mechanical crushing method is most
Simple and a kind of most economical method, regeneration aggregate water absorption rate reduction very little.Conventional heating methods and heating grinding method are in Japanese skill
Art is most ripe, because preparation process power consumption is unrealistic very greatly for energy China at full stretch, does not also calculate economically.
The acid-hatching of young eggs and chemical method are in the range of academic research, also have certain difficulty away from extensive engineer applied.
The third uses high-mark cement and high-effect adhesive.This kind of recycled concrete strength improves limited, with tradition
Compared to relatively costly, competitiveness is weaker under market condition for concrete.
4th kind of mixing method, generally uses secondary agitation method, and each component is grand in whipping process in concrete is ensured
While seeing uniformity, cement dispersiveness and degree of hydration are improved by the inventory and stirring order that change material, improve bone
Material-mortar interface, improves the adhesion strength of interfacial transition zone.More reference in existing regeneration concrete stirring means is passed
The ripe paddling process of system concrete, seldom considers or using the water imbibition of regeneration aggregate in whipping process.
The content of the invention
The invention aims to overcome problem present in above-mentioned known regeneration concrete preparation, a kind of stabilization is proposed
The regeneration concrete preparation method of performance, takes natural aggregate and regeneration aggregate formulated in combination to use, and takes full advantage of big particle diameter
The framework supporting role of regeneration aggregate, the filling effect of small particle natural aggregate considers and utilizes the suction of regeneration aggregate during stirring
Water characteristic, both ensure that the stabilization of the mechanical properties such as recycled concrete strength, and regeneration aggregate relative content, preparation side are improved again
Method is easy and effective, is capable of achieving to simplify production, reduces cost, may be directly applied to engineering practice.
The technical solution adopted by the present invention：A kind of regeneration concrete method for preparing stability, the method includes following
Step：
Step 1)：Prepare combination coarse aggregate；
The combination coarse aggregate is that natural aggregate and regeneration aggregate are sieved into big particle diameter group and granule respectively with vibratory sieve
Footpath group aggregate, with small particle natural aggregate and big particle diameter regeneration aggregate be configured to combine coarse aggregate one, big particle diameter natural aggregate and
Small particle regeneration aggregate is configured to combine coarse aggregate two；
Because big particle diameter regeneration aggregate water absorption rate is low, defect and crack are less, can effectively reduce combination coarse aggregate one
Moisture content；The negligible small particle natural aggregate of water absorption rate is blended into, grading curve is improved, therefore ensure that group
The quality and quality of coarse aggregate one are closed, the discreteness of aggregate physical parameter is reduced, uniformity is more preferable.Although combination coarse aggregate two
Be mixed into water absorption rate small particle regeneration aggregate higher, but because its content is low, combine coarse aggregate two water absorption rate be maintained at compared with
Low-level.
The combination coarse aggregate one is composed of the following components according to particle diameter and percentage by weight：
Natural aggregate, 5~16mm of particle diameter, content 0%~30%；
Regeneration aggregate, 5~42.5mm of particle diameter, content 70%~100%；
The compound method for combining coarse aggregate one is water that is smaller than the water absorption rate of small particle using big particle diameter regeneration aggregate, bonding
Cement mortar is few, defect and crack are few etc., and characteristic provides framework supporting role, and small particle natural aggregate provides filling effect, so matches somebody with somebody
The combination of system can not only reduce the defects such as water absorption rate, crack, can also improve the mass percent of regeneration aggregate.
The combination coarse aggregate two is composed of the following components according to particle diameter and percentage by weight：
Natural aggregate, 10~42.5mm of particle diameter, content 70%~95%；
Regeneration aggregate, 5~16mm of particle diameter, content 5%~30%；
The compound method of the combination coarse aggregate two, be using regeneration aggregate content in regeneration concrete it is relatively low when, its power
Learn performance close to the property of conventional concrete, although small particle regeneration aggregate water absorption rate is high, but shared percentage is relatively low, therefore
The combination water absorbing capacity of coarse aggregate two is very limited, it is ensured that prepare the quality of concrete.
Step 2)：Combination coarse aggregate, cement, fine aggregate, 10~35% volcanic ash or flyash are fed intake successively, dry mixing
To uniform, the water reducer of 1/2 water consumption and 0.5%~1.5% percentage by weight is added to stir 20~30 seconds to equal within 20~30 seconds
It is even, add remaining 1/2 water consumption to stir 60~120 seconds to uniform, it is made regeneration concrete.
The regeneration concrete preparation method, method is mixed using first dry mixing rewetting, is because regeneration aggregate is with respect to nature bone
The water absorption rate of material is big, and regeneration aggregate water suction is excessive in preventing whipping process, reduces the service behaviour of fresh concrete；It is same this
Method can reduce water consumption, so as to obtain the regeneration concrete of low water-cement ratio, its intensity is improved.Using wet-mixing twice
Method, postpones the time for adding water, and shortens last time and adds water to the time that stirring terminates, and acquisition service behaviour is good newly to mix
Concrete.Volcanic ash or flyash are added in dry mixing, is because volcanic ash and flyash can improve aggregate-mortar interface
Consistency, it is often more important that improve fresh concrete service behaviour.Addition and adjustment water reducer consumption can obtain and
The regeneration concrete of the identical service behaviour of conventional concrete.
Preferably, the combination coarse aggregate in order to make high-quality, the selection for vibrating mesh size is crucial, sieves aggregate
Vibratory sieve aperture in regeneration aggregate particle diameter the particle diameter of low water absorption be defined, generally 9~20mm.Due to regeneration aggregate
The characteristic of water absorption rate has the trend reduced with particle diameter increase, and wherein particle diameter is obvious in the change of 9~20mm water absorption rates, so passing through
Controlling the particle diameter of regeneration aggregate can effectively reduce the water absorption rate of combination coarse aggregate, while also reduce crack therein etc. lacking
Fall into, reached the purpose of lifting coarse aggregate quality.
The present invention makes full use of the principle of different-grain diameter aggregate effect in concrete, takes the water suction of regeneration aggregate into consideration
The characteristics such as rate, the cement mortar for bonding, defect and crack, using the big particle diameter regeneration aggregate of low water absorption, combine except improving
The quality of coarse aggregate, thoroughly overcomes the low intensity and discrete problem of substitution rate regeneration concrete high.The present invention is by existing
Feasible screening, preparation, stirring technique reduce the water absorption rate of regeneration aggregate, improve the quality of combination coarse aggregate, reduce regeneration
The water consumption and the ratio of mud of concrete, these are beneficial to improve the stability of Workability of Regenerated Concrete, intensity and intensity.
Beneficial effect：
(1) the combination coarse aggregate compound method and regeneration concrete preparation method that the present invention is used, can improve regeneration mixed
The solidifying soil mechanical property such as intensity and stability.
(2) compound method of coarse aggregate is combined, the screening and combination of coarse aggregate, simple to operate, convenient construction, and can be with
The water absorption rate of combination coarse aggregate is reduced to greatest extent, crack, the defect such as adhesive mortar is reduced, and gives full play to natural aggregate and again
Effect of the raw aggregate in concrete, aggregate is spatially distributed more tight, and physical property is more uniform, thoroughly solves regeneration
Regeneration aggregate mass percent problem not high in concrete.
(3) compound method of regeneration concrete, wet-mixing after first dry mixing, secondary wet-mixing, it is possible to reduce water consumption reduces water ash
Than, being conducive to improving concrete strength, the fresh concrete service behaviour of preparation is improved, and is easily guaranteed that.
(4) utilization rate for increasing regeneration aggregate by improving the quality of combination coarse aggregate is the effective of solution discarded concrete
One of approach, the present invention is mitigating pollution of the discarded concrete to environment, saves natural aggregate resources, alleviates aggregate supply and demand lance
Shield, reduces the consumption of natural resources and the energy, with significant society, economy and environmental benefit, meets wanting for sustainable development
Ask, be one of main path of development green concrete.
Brief description of the drawings
Fig. 1 is present invention combination coarse aggregate preparation process figure；
Fig. 2 is regeneration concrete preparation flow figure of the present invention.
Specific embodiment
Below in conjunction with drawings and Examples, the present invention is further illustrated.
As shown in Figure 1：A kind of compound method for combining coarse aggregate, by ready natural aggregate and regeneration aggregate by passing
Band is sent to pour vibratory sieve into respectively, with the low water absorption particle diameter of regeneration aggregate as boundary, be sieved through aperture is small particle in aperture
Aggregate, unsanctioned is large-particle-size aggregate, natural small aggregate and the big aggregate of regeneration is prepared into staged and matches somebody with somebody good combination coarse aggregate
One, natural big aggregate and the small aggregate of regeneration are configured to level with good combination coarse aggregate two.
As shown in Figure 2：A kind of regeneration concrete preparation method of stability, is weighed by the match ratio of conventional concrete
Combination coarse aggregate one or combination coarse aggregate two, cement, fine aggregate, flyash or volcanic ash, pour into whisking machines in order
Stirring (20~30s) adds 1/2 water consumption and water reducer to be again stirring for (20~30s) to uniform to uniform, is eventually adding remaining
1/2 water consumption stirs (60~120s) to uniform.
The excellent results of regeneration concrete preparation method of the invention are illustrated below by experiment.Experiment is to using combination
The characteristics such as service behaviour, the intensity of the regeneration concrete of coarse aggregate are evaluated.
Test material
1) coarse aggregate fundamental property is combined：Natural aggregate takes from Jiangsu concrete mixing plant, and regeneration aggregate takes from Jiangsu
Certain aggregate crushes factory.The water absorption rate of measurement natural aggregate and regeneration aggregate each particle diameter, collects tabulation, and as shown in table 1, analysis is tied
Fruit finds the water absorption rate of regeneration aggregate as the increase of particle diameter diminishes.
The water absorption rate of the aggregate of table 1
| Particle diameter (mm) | 5~10 | 10~16 | 16~20 | 20~42.5 |
| Natural aggregate | 0.7 | 0.5 | 0.3 | 0.2 |
| Regeneration aggregate | 5.8 | 4.8 | 3.5 | 3.4 |
Combination coarse aggregate is prepared according to following particle diameter and percentage by weight：
Combine the component of coarse aggregate one (100%)
Regeneration aggregate, 5~42.5mm of particle diameter, content 100%；
Water absorption rate 3.4%；
Combine the component of coarse aggregate one (85%)
Natural aggregate, 5~10mm of particle diameter, content 15%；
Regeneration aggregate, 10~42.5mm of particle diameter, content 85%；
Water absorption rate 3.2%；
Combine the component of coarse aggregate one (70%)
Natural aggregate, 5~16mm of particle diameter, content 30%；
Regeneration aggregate, 16~42.5mm of particle diameter, content 70%；
Water absorption rate 2.6%；
Combine the component of coarse aggregate two (30%)
Natural aggregate, 16~42.5mm of particle diameter, content 70%；
Regeneration aggregate, 5~16mm of particle diameter, content 30%；
Water absorption rate 1.8%；
Combine the component of coarse aggregate two (15%)
Natural aggregate, 5~42.5mm of particle diameter, content 85%；
Regeneration aggregate, 5~10mm of particle diameter, content 15%；
Water absorption rate 1.0%；
Combine the component of coarse aggregate two (5%)
Natural aggregate, 5~42.5mm of particle diameter, content 95%；
Regeneration aggregate, 5~10mm of particle diameter, content 5%；
Water absorption rate 0.6%；
2) fine aggregate fundamental property：Sand takes from Jiangsu concrete mixing plant during experiment is used, and its basic index is apparent close
Degree 2.5g/cm3, bulk density 1500kg/m3, porosity 40%, modulus of fineness 2.0, clay content 2.5%, moisture content 3%.
3) cement fundamental property：Test water mud takes from the Portland cement of Jiangsu cement plant production, label
42.5, magnesia 3.8%, sulfur trioxide 3.0%, fineness 8.0%.
4) volcanic ash fundamental property：Volcanic ash fineness 11.5%, loss on ignition 1.48%, sulfur trioxide 0.14%, density
2.71g/cm3, specific surface area 458m2/ kg, water demand ratio 101%, chemical composition composition, as shown in table 2.
The volcanic ash chemical composition of table 2
| Composition (%) | SiO2 | Al2O3 | Fe2O3 | CaO | MgO | SO3 | Na2O | K2O |
| Volcanic ash | 58.24 | 16.76 | 6.78 | 7.11 | 3.67 | 0.08 | 3.49 | 2.99 |
5) water reducer fundamental property：The naphthalene water reducer of Jiangsu company production is chosen in experiment.
Embodiment 1
According to preparation method of the invention, the combination coarse aggregate one (100%) prepared using above-mentioned test material, coagulation
Native match ratio is as shown in table 3.
The concrete mix of table 3
Load weighted various raw material are poured into stirring successively according to combination coarse aggregate, fine aggregate, cement, 35% volcanic ash
Machine, dry mixing 25s stirs；Add and stir after 1/2 water consumption and 1.5% water reducer 25s to uniform；Add remaining 1/2
Water consumption stirring 90s is uniform, the slump of the concrete sample that measurement stirs.Make one group of concrete standard test block
150 × 150 × 300mm, is placed in 20 DEG C of environment and stands diel, and 20 DEG C are immediately placed in after form removal, and relative humidity is
Conserved in 100% fog room.
Embodiment 2
Preparation process with embodiment 1 is identical, except that, coarse aggregate one (85%) is combined in selecting for coarse aggregate,
30% volcanic ash, 1.4% water reducer.
Embodiment 3
Preparation process with embodiment 1 is identical, except that, coarse aggregate one (70%) is combined in selecting for coarse aggregate,
25% volcanic ash, 1.3% water reducer.
Embodiment 4
Preparation process with embodiment 1 is identical, except that, coarse aggregate two (30%) is combined in selecting for coarse aggregate,
15% volcanic ash, 0.8% water reducer.
Embodiment 5
Preparation process with embodiment 1 is identical, except that, coarse aggregate two (15%) is combined in selecting for coarse aggregate,
10% volcanic ash, 0.7% water reducer.
Embodiment 6
Preparation process with embodiment 1 is identical, except that, coarse aggregate two (5%), 7% are combined in selecting for coarse aggregate
Volcanic ash, 0.5% water reducer.
Comparative example 1
Preparation process with embodiment 1 is identical, except that, the whole of coarse aggregate selects natural aggregate, does not mix fire
Mountain ash, 0.5% water reducer.
Comparative example 2
Preparation process with embodiment 1 is identical, except that, the component of coarse aggregate is：
Natural aggregate, 5~42.5mm of particle diameter, content 30%；
Regeneration aggregate, 5~42.5mm of particle diameter, content 70%；
Do not mix volcanic ash, 0.5% water reducer.
Process of the test
The slump test of working performance of concrete is measured according to specification《Standard for test methods of properties of ordinary concrete mixture mark
Quasi- GB/T50080-2002》In 3.1 slumps carried out with slump divergence method.The compression strength of concrete cube test specimen
Determine according to《Mechanical performance of concrete experimental method GB/T 50081-2002》In 6. compressive strength tests carry out.Concrete
The measure of the elastic modelling quantity of cube specimen according to《Mechanical performance of concrete experimental method GB/T 50081-2002》In it is 8. quiet
Power compression elasticity modulus test.
Slump test：Respectively to the fresh concrete for the stirring layering of embodiment 1-4, comparative example 1 and comparative example 2
And vibrate and fill slump cylinder, with the floating rear lift-off of spatula, measuring cylinder is high and slump after height between concrete sample peak
Degree is poor.
Compressive strength test：Respectively to the concrete cube of the maintenance 28 days of embodiment 1-4, comparative example 1 and comparative example 2
Sample is placed on pressure testing machine, and loading velocity takes 0.5~0.8MPa each second, when test specimen starts drastically to deform close to destruction
Adjustment Tests machine oil door should be stopped, until destruction, then records failing load.
Result of the test
Slump result of the test is as shown in table 4
The embodiment 1-4's for combining coarse aggregate one and combination coarse aggregate two for being prepared using the present invention as can be found from Table 4
Slump difference compared with comparative example 1 is less, larger compared with comparative example 2.Illustrate by mixing volcanic ash and adjustment
The consumption of water reducer can be effectively improved the service behaviour of fresh concrete, close to the slump level of conventional concrete.
The slump of table 4
Compressive strength test result is as shown in table 5
The concrete crushing strength of table 5 (MPa)
| Sample name | Sample 1 | Sample 2 | Sample 3 | Average | Variance |
| Embodiment 1 | 28.50 | 27.42 | 27.05 | 27.66 | 0.57 |
| Embodiment 2 | 26.87 | 27.05 | 25.45 | 26.46 | 0.77 |
| Embodiment 3 | 21.39 | 21.80 | 23.11 | 22.10 | 0.80 |
| Embodiment 4 | 28.50 | 26.66 | 25.45 | 26.87 | 2.36 |
| Embodiment 5 | 29.17 | 27.42 | 26.05 | 27.55 | 2.43 |
| Embodiment 6 | 30.32 | 29.94 | 27.42 | 29.23 | 2.48 |
| Comparative example 1 | 30.34 | 31.51 | 30.82 | 30.89 | 0.35 |
| Comparative example 2 | 19.64 | 21.61 | 18.36 | 19.87 | 2.68 |
As can be seen from Table 5：The discovery of comparative example 1-3, comparative example 1, the concrete strength of comparative example 2 and variance, when
When regeneration aggregate content is between 70%~100%, the intensity of the intensity significantly lower than comparative example 1 of embodiment 1-3 concrete, with
The increase recycled concrete strength for regeneration aggregate increases；But variance is more or less the same, illustrate to be carried using combination coarse aggregate
The stability of recycled concrete strength high.The intensity of embodiment 2 is illustrated more than the intensity of comparative example 2, in same regeneration aggregate
In the case of content, choosing the combination coarse aggregate prepared by big small particle aggregate can not only improve the intensity of regeneration concrete,
The stability of concrete strength can also be improved.The discovery of comparative example 4-6, the intensity of comparative example 1 and variance, works as regeneration aggregate
When content is between 5%~30%, embodiment 4-6 intensity be less than comparative example 1, more than embodiment 1-3, illustrate regenerate content compared with
Concrete strength declines limited when low.
It should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention,
Some improvements and modifications can also be made, these improvements and modifications also should be regarded as protection scope of the present invention.In the present embodiment not
Clear and definite each part can use prior art to be realized.
Claims (2)
1. a kind of regeneration concrete method for preparing stability, it is characterised in that：The method is comprised the following steps：
Step 1)：Prepare combination coarse aggregate；
The combination coarse aggregate is that natural aggregate and regeneration aggregate are sieved into big particle diameter group and small particle group respectively with vibratory sieve
Aggregate, is configured to combine coarse aggregate one, big particle diameter natural aggregate and granule with small particle natural aggregate and big particle diameter regeneration aggregate
Footpath regeneration aggregate is configured to combine coarse aggregate two；
The combination coarse aggregate one is composed of the following components according to particle diameter and percentage by weight：
Natural aggregate, 5~16mm of particle diameter, content 15%~30%；
Regeneration aggregate, 5~42.5mm of particle diameter, content 70%~85%；
Wherein, natural aggregate particle diameter is less than regeneration aggregate particle diameter；
The combination coarse aggregate two is composed of the following components according to particle diameter and percentage by weight：
Natural aggregate, 10~42.5mm of particle diameter, content 70%~95%；
Regeneration aggregate, 5~16mm of particle diameter, content 5%~30%；
Wherein, natural aggregate particle diameter is more than regeneration aggregate particle diameter；
Step 2)：Combination coarse aggregate, cement, fine aggregate, 10~35% volcanic ash or flyash are fed intake successively, dry mixing 20~
To uniform, the water reducer of 1/2 water consumption and 0.5%~1.5% percentage by weight is added to stir 20~30 seconds to uniform within 30 seconds, plus
Enter remaining 1/2 water consumption and stir 60~120 seconds to uniform, be made regeneration concrete.
2. a kind of regeneration concrete method for preparing stability according to claim 1, it is characterised in that：The step
1) aperture of the vibratory sieve of screening aggregate is 9~20mm in.
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