CN110282926A - A kind of building waste materials recycling concrete and preparation method thereof - Google Patents
A kind of building waste materials recycling concrete and preparation method thereof Download PDFInfo
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- CN110282926A CN110282926A CN201910563338.0A CN201910563338A CN110282926A CN 110282926 A CN110282926 A CN 110282926A CN 201910563338 A CN201910563338 A CN 201910563338A CN 110282926 A CN110282926 A CN 110282926A
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
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- 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
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- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
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- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The present invention relates to building material technical field, especially a kind of building waste materials recycling concrete and preparation method thereof.Wherein, regeneration concrete includes 225-350 parts, II grade 85-95 parts of flyash of PO42.5 cement, 0-85 parts of S95 miberal powder, fine aggregate 658-1047 parts natural, 741-988 parts of regenerated coarse aggregate, 9-10.5 parts of additive, 160-192 parts of water according to parts by weight；Wherein, the fineness modulus of natural fine aggregate is 2.6, and the grain composition of the regenerated coarse aggregate is 5-31.5mm.The present invention is based on isometric mortar method (that is: EMV methods), by establishing remaining mortar volume Transformation formula and to the comparison of the Analysis of Physical of raw material and a large amount of creative experiments data, obtain regeneration concrete match ratio the most practical, to meet practical engineering application demand while promoting the quality parameter of regeneration concrete.
Description
Technical field
The present invention relates to building material technical field, especially a kind of building waste materials recycling concrete and its preparation side
Method.
Background technique
Regeneration concrete is that the concrete that will be discarded is obtained through over cleaning, broken, classification and by a certain percentage after mutual cooperation
To recycled aggregate make the partly or entirely concrete that is formulated of substitution natural aggregate, meanwhile, by addition additive and mix
It closes material etc. and carries out property regulation, to improve the intensity of regeneration concrete, there is good mechanical property and durable after hardening it
Performance.And the application of recycled aggregate then advantageously reduces using and develop, limited resource being made to be regenerated benefit for natural aggregate
With.
The conventional method for preparing regeneration concrete mainly regards recycled aggregate as homogeneous integral material, uses recycled aggregate
By isometric or wait quality that natural aggregate is replaced to prepare；Since recycled aggregate is the mortar adhered to by natural aggregate and its surface
It constituting, the simple mortar total volume substituted in natural aggregate corpse regeneration concrete is bigger than normal, and cause elasticity modulus to decrease, and
And since the source of recycled aggregate is different from processing method, quality and surface content of mortar are had differences, so that regeneration
The discreteness of concrete strength is bigger than normal.To eliminate influence of the attachment content of mortar to regeneration concrete performance, Canadian scholar
Fathifazl proposed isometric mortar method (that is: EMV) in 2008, it may be assumed that by the primary coarse aggregate and its table in recycled aggregate
The mortar adhered on face, which is regarded as, is different solid phase, while must satisfy overall with comparison normal concrete mortar having the same
Product (mortar total volume is fresh mortar volume and the sum of attachment mortar volume on recycled aggregate in regenerated aggregate concrete) matches
Composition and division in a proportion method, studies have shown that preparing regeneration concrete using EMV method, mechanical property and deformation performance are all close to comparison
Normal concrete.
However, actually matching preparation, regeneration coagulation since isometric mortar method is only the method for a general property or principle
In the process of soil, the difference of the match ratio of recycled aggregate often will have a direct impact on the final performance of regeneration concrete, to also lead
Cause the regeneration concrete prepared based on the method irregular on quality parameter；Therefore, how based on isometric mortar method come
Formulation components match ratio is the most practical, quality parameter is superior regeneration concrete, has become urgently to be resolved in industry
Technical problem.
Summary of the invention
In view of the deficiency of the prior art, the first purpose of this invention is to provide a kind of building waste waste material
Regeneration concrete, second object of the present invention are to provide a kind of method for preparing aforementioned regeneration concrete.
To achieve the goals above, first technical solution that the present invention uses are as follows:
A kind of building waste materials recycling concrete, according to parts by weight, including
Wherein, the fineness modulus of the natural fine aggregate is 2.6, and the grain composition of the regenerated coarse aggregate is 5-
31.5mm。
Preferably, the additive is by mass percentage, comprising:
Preferably, according to parts by weight, including
Preferably, according to parts by weight, including
Preferably, according to parts by weight, including
Preferably, according to parts by weight, including
Second technical solution that the present invention uses are as follows:
A method of preparing above-mentioned building waste materials recycling concrete, it is characterised in that: comprising steps of
S1, construction waste is sorted, the construction waste after sorting is crushed, vibrosieve is to obtain regeneration slightly
Aggregate；
S2, PO42.5 cement, II grade of flyash, the natural fine bone that fineness modulus is 2.6 are weighed respectively in parts by weight
Material, regenerated coarse aggregate, additive, water and/or the S95 miberal powder that grain composition is 5-31.5mm；
S3, natural fine aggregate and regenerated coarse aggregate be thoroughly mixed first, cement, flyash is then added
And/or miberal powder continues to be stirred, and is eventually adding water and additive continues to be stirred；
S4, uniformly rear discharging to be mixed, can be prepared by regeneration concrete.
As the above scheme is adopted, the present invention is based on isometric mortar method (that is: EMV methods), by establishing remaining mortar
Volume displaced formula simultaneously compares the Analysis of Physical of raw material and a large amount of creative experiments data, obtains the most real
Regeneration concrete match ratio, to meet practical engineering application demand while promoting the quality parameter of regeneration concrete；
Meanwhile the preparation of regeneration concrete is carried out based on regenerated coarse aggregate caused by building waste waste material, it can reduce in cement former material
Generated cost in the exploitation and production process of material, while it is useless also can to limits to recycle discarded concrete building
Material, to generate important energy economy & environment benefit, and advantageously reduces the discharge of greenhouse gases.
Detailed description of the invention
Fig. 1 is recycled fine aggregate Replacement rate and concrete density relational graph of the invention；
Fig. 2 is recycled coarse aggregate contents and concrete density relational graph of the invention；
Fig. 3 is the compression strength variation diagram after of the invention the test block of regenerated coarse aggregate concrete 7 days；
Fig. 4 is the compression strength relational graph in recycled coarse aggregate contents and concrete test block 28 days；
Fig. 5 is the compression strength relational graph in recycled fine aggregate Replacement rate and concrete test block 7 days；
Fig. 6 is the compression strength relational graph in recycled fine aggregate Replacement rate and concrete test block 28 days.
Specific embodiment
The embodiment of the present invention is described in detail below in conjunction with attached drawing, but the present invention can be defined by the claims
Implement with the multitude of different ways of covering.
In conjunction with Fig. 1 to Fig. 6, a kind of building waste materials recycling concrete provided by the present embodiment and preparation method thereof,
It is mainly based upon isometric mortar method (that is: EMV method), by establishing remaining mortar volume Transformation formula and to the object of raw material
Rationality can analyse and compare and a large amount of creative experiments data, regeneration concrete match ratio the most practical is obtained, to mention
While rising the quality parameter of regeneration concrete, meet practical engineering application demand.It is specific as follows:
One, raw material physical property compares
1, coarse aggregate Fundamental Physical Properties compare
Regenerated coarse aggregate and natural coarse aggregate are compared under the conditions of same grain composition, obtain table one:
Amount containing slurry indicate regenerated coarse aggregate adhering on surface the size of cement mortar, be that regenerated coarse aggregate is different from nature bone
The important indicator of material；According to the comparison result of table one: the amount containing slurry of regenerated coarse aggregate is bigger, crush index, water absorption rate
It is bigger with moisture content, and apparent density is then smaller.
2, fine aggregate Fundamental Physical Properties compare
Grain composition is identical and fineness modulus similar in situation, compare recycled fine aggregate and natural fine aggregate be (natural
River sand or nature medium sand), obtain table two:
According to the comparison result of table two: in the situation similar in grain composition and fineness modulus, recycled fine aggregate
Apparent density is small, voidage is big, moisture content is larger, wherein water absorption rate is the 240% of natural fine aggregate.Reason is: regeneration is thin
Aggregate is made of the sandstone that a large amount of cement mortar are adhered on drilled cement and surface, so recycled fine aggregate has high voidage,
The feature of high-hydroscopicity.
Two, regeneration concrete Mix Ratio Test
1, natural aggregate and recycled aggregate above-mentioned are selected and difference is made based on isometric mortar method (that is: EMV method)
Baseline regeneration concrete, obtain table three:
In table, NAC represents the Replacement rate of regenerated coarse aggregate and recycled fine aggregate and represents as zero, RMC-10 to be replaced in coarse aggregate
In the case that rate is zero, fine aggregate Replacement rate is 100%, the concrete and so on of other RMC number；RC-X20 is represented thin
In the case that aggregate Replacement rate is zero, the Replacement rate of coarse aggregate is 20%, the concrete and so on of other RC number.
2, various baseline regeneration concrete prepared to table three carry out concrete density analysis, obtain table four:
According to the comparison result of table four: since under same partial size, with gradation, the apparent density of regenerated coarse aggregate is less than
Natural coarse aggregate, voidage are greater than natural coarse aggregate；The apparent density of recycled fine aggregate is less than natural fine aggregate, voidage is greater than
Natural fine aggregate, bigger so as to cause the Replacement rate of recycled aggregate, the density of regeneration concrete is smaller (being detailed in Fig. 1 and Fig. 2).
3, various baseline regeneration concrete prepared to table three carry out 7 days and 28 days Compressive Strength Analysis, obtain table five
With table six:
According to the comparison result of table five and table six and referring to Fig. 3 to Fig. 6 you can get it following rule:
It can be determined via Fig. 3 and Fig. 4: compared to common normal concrete, under identical conditions of mixture ratios, regenerated coarse aggregate
The early strength of concrete (regeneration concrete for referring to: not adding recycled fine aggregate and only select regenerated coarse aggregate) is apparently higher than general
Logical normal concrete, and compression strength is descending is respectively as follows: RC-X40, RC-X20, RC-X60, RC-X80, NAC, RC-
X100；And the compression strength in later period then can be bigger and smaller with recycled coarse aggregate contents.
It can be determined via Fig. 5 and Fig. 6: in the identical situation of recycled coarse aggregate contents, the substitution of recycled fine aggregate
Rate is bigger, and the compression strength of regeneration concrete can be smaller.
Since under same partial size, with gradation, the apparent density of regenerated coarse aggregate is less than natural coarse aggregate, voidage is greater than day
Right coarse aggregate；The apparent density of recycled fine aggregate is less than natural fine aggregate, voidage is greater than natural fine aggregate, so as to cause regeneration
The Replacement rate of aggregate is bigger, and the density of regeneration concrete is smaller (being detailed in Fig. 1 and Fig. 2).
4, it is based on Compressive Strength Analysis above-mentioned, the selection of recycled fine aggregate can be excluded when preparing regeneration concrete,
Therefore, subsequent concrete performance analyses and comparison are carried out with the regeneration concrete that regenerated coarse aggregate is prepared, wherein with agent on crack resistance of concrete
Infiltration property is tested, and table seven is obtained:
Due to influencing the maximum particle diameter because being known as the ratio of mud, aggregate, the maintenance process, cement type of concrete permeability
Deng therefore, above-mentioned test is carried out in the identical situation of factors above, according to table seven: regeneration concrete it is anti-
Osmotic strength shows the trend of first increases and then decreases with the increase of coarse aggregate Replacement rate, when recycled coarse aggregate contents are
When 40%, regeneration concrete has optimal impermeability, this is similar to the changing rule of compression strength.In addition, by adjusting again
Raw coarse aggregate Replacement rate, regenerated coarse aggregate source and the ratio of mud, doping quantity of fly ash, airbleed dosage etc., to analyze regeneration coagulation
The Frost Resistance of soil, the results showed that increase doping quantity of fly ash, the anti-freezing property for coagulating soil can be regenerated improving to a certain degree,
But with the increase of doping quantity of fly ash, 7d and 28d intensity has a degree of decline, this rule and normal concrete
Relatively.
Three, the regeneration concrete of the present embodiment is prepared
Analysis of Physical and the Mix Ratio Test of comprehensive aforementioned aggregate are as a result, the present embodiment uses isometric mortar method
And regeneration concrete the most practical is prepared using regenerated coarse aggregate and natural fine aggregate, while by natural coarse aggregate and day
The strength grade that right fine aggregate is formulated be the normal concrete of C20 and C50 as a comparison case；Wherein:
Regenerated coarse aggregate, natural coarse aggregate, the natural fine aggregate specific standards of selection are shown in Table eight:
Normal concrete (that is: the comparative example for being C20 by the strength grade that natural coarse aggregate and natural fine aggregate are formulated
1) benchmark is shown in Table nine with when index request:
Normal concrete (that is: the comparative example for being C50 by the strength grade that natural coarse aggregate and natural fine aggregate are formulated
2) benchmark is shown in Table ten with when index request:
1, embodiment 1, strength grade are the preparation of the regeneration concrete of C20:
A, using isometric mortar method and proportion and index parameter based on comparative example 1, to calculate the use of regenerated coarse aggregate
Amount, specifically:
1) the aggregate total volume of comparative example 1 is 852/2.63 (apparent density of natural fine aggregate)+1029/2.77 (natural
The apparent density of coarse aggregate)=692；
2) the aggregate total volume (that is: replacing natural coarse aggregate using regenerated coarse aggregate) of embodiment 1 is X and prewired sand coarse aggregate ratio
It is 47%, then 0.47*X/2.63 (apparent density of natural fine aggregate)+0.53*X/2.53 (apparent density of regenerated coarse aggregate)
=692, it is 1783 that X, which can be obtained, and then determines that natural fine aggregate is 1783*47%=838, regenerated coarse aggregate 1783-838
=945.
3) it is based on aforementioned calculated result, the benchmark match ratio of the regeneration concrete of embodiment 1 can be determined, be shown in Table 11:
B, the regeneration concrete that strength grade is C20 is prepared with the following method, specifically:
S1, construction waste is sorted, the construction waste after sorting is crushed, vibrosieve is to obtain in table eight
Regenerated coarse aggregate and select natural fine aggregate in table eight；
S2,225 parts, II grade 95 parts of flyash of PO42.5 cement, fineness modulus are weighed respectively in parts by weight as 2.6
Natural 838-1047 parts of fine aggregate, 9 parts of 741-945 parts of regenerated coarse aggregate, the additive and water that grain composition is 5-31.5mm
187-192 parts；Wherein, additive is by mass percentage, comprising:
S3, natural fine aggregate and regenerated coarse aggregate be thoroughly mixed first, cement and flyash is then added
Continue to be stirred, is eventually adding water and additive continues to be stirred；
S4, uniformly rear discharging to be mixed, can be prepared by the regeneration concrete that strength grade is C20.
For substantially more verify embodiment 1 regeneration concrete performance, and slump identical in water-cement ratio (0.6)
In the case that (210-220mm) is almost the same, the normal concrete in regeneration concrete and comparative example 1 to embodiment 1 is carried out
It compares, the concrete test block pressure resistance intensity of the two is shown in Table 12:
2, embodiment 2, strength grade are the preparation of the regeneration concrete of C50:
A, using isometric mortar method and proportion and index parameter based on comparative example 2, to calculate the use of regenerated coarse aggregate
Amount, specifically:
1) the aggregate total volume of comparative example 2 is 662/2.63 (apparent density of natural fine aggregate)+1080/2.77 (natural
The apparent density of coarse aggregate)=642；
2) the aggregate total volume (that is: replacing natural coarse aggregate using regenerated coarse aggregate) of embodiment 2 is X and prewired sand coarse aggregate ratio
It is 40%, then 0.40*X/2.63 (apparent density of natural fine aggregate)+0.60*X/2.53 (apparent density of regenerated coarse aggregate)
=642, it is 1646 that X, which can be obtained, and then determines that natural fine aggregate is 1646*40%=658, regenerated coarse aggregate 1646-658
=988.
3) it is based on aforementioned calculated result, the benchmark match ratio of the regeneration concrete of embodiment 2 can be determined, be shown in Table 13:
C, the regeneration concrete that strength grade is C50 is prepared with the following method, specifically:
S1, construction waste is sorted, the construction waste after sorting is crushed, vibrosieve is to obtain in table eight
Regenerated coarse aggregate and select natural fine aggregate in table eight；
S2, it weighs 350 parts, II grade 85 parts of flyash of PO42.5 cement respectively in parts by weight, is 85 parts of S95 miberal powder, thin
Degree modulus is natural fine aggregate 658-756 parts of 2.6,891-988 parts of the regenerated coarse aggregate that grain composition is 5-31.5mm, additional
10.5 parts and water 160-166 parts of agent；Wherein, additive is by mass percentage, comprising:
S3, natural fine aggregate and regenerated coarse aggregate be thoroughly mixed first, be then added cement, flyash and
Miberal powder continues to be stirred, and is eventually adding water and additive continues to be stirred；
S4, uniformly rear discharging to be mixed, can be prepared by the regeneration concrete that strength grade is C50.
For substantially more verify embodiment 2 regeneration concrete performance, and slump identical in water-cement ratio (0.32)
In the case that (210-220mm) is almost the same, the normal concrete in regeneration concrete and comparative example 1 to embodiment 1 is carried out
It compares, the concrete test block pressure resistance intensity of the two is shown in Table 14:
According to from the point of view of the test data of table 12 and table 13, the prepared regeneration concrete of the present embodiment 1 and 2, in phase
In the case where water-cement ratio, compression strength will be substantially better than common normal concrete；Pass through the stream to regeneration concrete simultaneously
The index analysis such as dynamic property, cohesiveness, water-retaining property (concrete analysis process and data, therefore not to repeat here), and by nature bone
Expect that the common normal concrete prepared is identical, even better.
Based on this, passes through analysis to aforementioned lot of experimental data, utilization and optimize isometric mortar method to prepare again
Growing concrete has optimal practical match ratio；Meanwhile by experimental studies have found that: regeneration concrete according to the present embodiment,
By the adjustment to individual components component, the regeneration coagulation that there is same physical mechanical property with natural aggregate concrete is being prepared
When native, cement consumption can be reduced, to reduce the generated cost in the exploitation and production process of cement raw material, simultaneously
Also discarded concrete construction waste can to limits be recycled, to generate important energy economy & environment benefit, and is had
Conducive to the discharge for reducing greenhouse gases.
The above description is only a preferred embodiment of the present invention, is not intended to limit the scope of the invention, all utilizations
Equivalent structure or equivalent flow shift made by description of the invention and accompanying drawing content is applied directly or indirectly in other correlations
Technical field, be included within the scope of the present invention.
Claims (7)
1. a kind of building waste materials recycling concrete, it is characterised in that: according to parts by weight, including
Wherein, the fineness modulus of the natural fine aggregate is 2.6, and the grain composition of the regenerated coarse aggregate is 5-31.5mm.
2. a kind of building waste materials recycling concrete as described in claim 1, it is characterised in that: the additive presses quality
Percentages, comprising:
3. a kind of building waste materials recycling concrete as claimed in claim 2, it is characterised in that: according to parts by weight, packet
It includes
4. a kind of building waste materials recycling concrete as claimed in claim 3, it is characterised in that: according to parts by weight, packet
It includes
5. a kind of building waste materials recycling concrete as claimed in claim 2, it is characterised in that: according to parts by weight, packet
It includes
6. a kind of building waste materials recycling concrete as claimed in claim 5, it is characterised in that: according to parts by weight, packet
It includes
7. a kind of method for preparing building waste materials recycling concrete of any of claims 1-6, feature exist
In: comprising steps of
S1, construction waste is sorted, the construction waste after sorting is crushed, vibrosieve is to obtain regenerating thick bone
Material；
S2, weigh respectively in parts by weight PO42.5 cement, II grade of flyash, fineness modulus be 2.6 natural fine aggregate,
Regenerated coarse aggregate, additive, water and/or the S95 miberal powder that grade is matched for 5-31.5mm；
S3, natural fine aggregate and regenerated coarse aggregate be thoroughly mixed first, be then added cement, flyash and/or
Miberal powder continues to be stirred, and is eventually adding water and additive continues to be stirred；
S4, uniformly rear discharging to be mixed, can be prepared by regeneration concrete.
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| CN111875309A (en) * | 2020-06-22 | 2020-11-03 | 浙江二十冶建设有限公司 | Recycled concrete and preparation method and application thereof |
| CN112028565A (en) * | 2020-08-03 | 2020-12-04 | 广东工业大学 | Recycled coarse aggregate seawater sea sand concrete and preparation method and application thereof |
| CN112951346A (en) * | 2020-11-30 | 2021-06-11 | 南京航空航天大学 | Mix proportion design method suitable for mixed recycled coarse aggregate concrete |
| CN113461368A (en) * | 2020-03-31 | 2021-10-01 | 南开大学 | Preparation method of recycled concrete |
| CN113655002A (en) * | 2021-08-30 | 2021-11-16 | 华侨大学 | Recycled aggregate quality detection system with mortar on surface based on hyperspectral technology |
| CN113979688A (en) * | 2021-09-26 | 2022-01-28 | 常州大学 | Recycled concrete capable of being repeatedly utilized in cold regions and preparation method |
| CN114004071A (en) * | 2021-10-21 | 2022-02-01 | 山东大学 | Method and system for predicting elastic modulus of recycled concrete |
| CN114380543A (en) * | 2021-12-29 | 2022-04-22 | 苏州良浦住宅工业有限公司 | Preparation method of recycled aggregate concrete applied to wallboard |
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| CN113461368A (en) * | 2020-03-31 | 2021-10-01 | 南开大学 | Preparation method of recycled concrete |
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| CN114004071A (en) * | 2021-10-21 | 2022-02-01 | 山东大学 | Method and system for predicting elastic modulus of recycled concrete |
| CN114380543A (en) * | 2021-12-29 | 2022-04-22 | 苏州良浦住宅工业有限公司 | Preparation method of recycled aggregate concrete applied to wallboard |
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