CN112430043A - High polymer environment-friendly recycled concrete and preparation method thereof - Google Patents
High polymer environment-friendly recycled concrete and preparation method thereof Download PDFInfo
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- CN112430043A CN112430043A CN202011460263.2A CN202011460263A CN112430043A CN 112430043 A CN112430043 A CN 112430043A CN 202011460263 A CN202011460263 A CN 202011460263A CN 112430043 A CN112430043 A CN 112430043A
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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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- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
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- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The application relates to the field of concrete, and specifically discloses high polymer environment-friendly recycled concrete, which comprises the following components in parts by weight: 980 parts of coarse aggregate, 680 parts of 630 parts of fine aggregate, 380 parts of cement, 60-80 parts of slag powder, 110 parts of fly ash, 170 parts of 155 parts of water and 2-5 parts of polycarboxylic acid water reducer, wherein the coarse aggregate is regenerated coarse aggregate with a purple adhesive film wrapped on the surface. The application of the high polymer environment-friendly recycled concrete has the advantages that the influence on the concrete setting time is reduced while the workability of the recycled concrete is improved.
Description
Technical Field
The application relates to the field of concrete, in particular to high polymer environment-friendly recycled concrete and a preparation method thereof.
Background
The concrete is a building material which is prepared by taking cement as a main cementing material, mixing with water, sand, stone or some necessary additives according to a certain proportion, stirring, compacting, forming, curing and hardening. The environment-friendly recycled concrete is new concrete produced by reasonably proportioning concrete waste and cement.
In the recycled concrete of the related technology, mortar is wrapped on the surface of the recycled aggregate obtained by crushing waste concrete, so that the surface is rough, the specific surface area is large, the flowability of fresh concrete is unfavorable, the workability is poor, and a viscosity regulator is generally added to regulate the workability of the concrete so as to reach the construction standard.
In view of the above-mentioned related arts, the inventors believe that the viscosity modifier is beneficial for adjusting the workability of concrete, but affects the prolonging of the setting of concrete, so that the setting time of concrete is too long, and the construction period is prolonged while the curing cost is increased.
Disclosure of Invention
In order to improve the workability of recycled concrete and reduce the influence on the setting time of the concrete, the application provides high polymer environment-friendly recycled concrete and a preparation method thereof.
In a first aspect, the present application provides a polymer environment-friendly recycled concrete, which adopts the following technical scheme:
the high polymer environment-friendly recycled concrete and the preparation method thereof comprise the following components in parts by weight: 980 parts of coarse aggregate, 680 parts of 630 parts of fine aggregate, 380 parts of cement, 60-80 parts of slag powder, 110 parts of fly ash, 170 parts of 155 parts of water and 2-5 parts of polycarboxylic acid water reducer, wherein the coarse aggregate is regenerated coarse aggregate with a purple adhesive film wrapped on the surface.
By adopting the technical scheme, when the concrete is mixed, the high polymer shellac is coated on the surface of the recycled coarse aggregate, so that the smoothness of the surface of the recycled coarse aggregate is improved, the friction force between the recycled coarse aggregate and other aggregates is reduced, and the workability of the concrete is improved. Since no viscosity modifier is introduced, the possibility of influencing the setting time of the concrete is reduced, and therefore, the effect of reducing the influence on the setting time of the concrete while improving the workability of recycled concrete is obtained.
Preferably, the violet glue film is a dewaxing violet glue film.
By adopting the technical scheme, the dewaxing lac has stronger adhering capability, can be adhered to the regenerated coarse bone more firmly, and reduces the possibility that the film layer wrapped on the regenerated coarse aggregate is broken by impact when the concrete is mixed, thereby reducing the possibility that the film layer is damaged and further improving the workability of the concrete.
Preferably, the coating also comprises 30-50 parts by weight of epoxy resin and 20-35 parts by weight of sodium borate, and the coarse aggregate is regenerated coarse aggregate which is encapsulated with a modified amine curing agent and the surface of which is wrapped with a violet film.
By adopting the technical scheme, the lac film layer plays a role in reducing friction during mixing, and the workability of concrete is improved. After mixing, in the concrete setting process, the sodium borate can quickly dissolve the lac membrane, so that the modified amine curing agent filled and sealed in the crack generated in the crushing process flows out from the regenerated coarse aggregate, and the modified amine curing agent and the epoxy resin in the concrete matrix are combined and then hardened, thereby promoting the setting of the concrete and playing a role in shortening the setting time of the concrete.
Preferably, the composition also comprises 10-15 parts by weight of ethanol.
By adopting the technical scheme, the lac can be better dissolved in a sodium borate-alcohol system, and a hard polymer is generated, so that the hardening effect is further improved, and the setting time of concrete is shortened.
Preferably, the particle size of the coarse aggregate is 10-20mm, and the coarse aggregate is continuously prepared.
By adopting the technical scheme, the coarse aggregate is easier to be coated by the lac when the particle size of the coarse aggregate is continuously integrated at 10-20mm, and the edge angle is smaller, thereby being beneficial to improving the workability of concrete.
Preferably, the fine aggregate is river sand.
By adopting the technical scheme, the river sand has round and smooth appearance, has smaller friction force with other aggregates of the concrete, and is favorable for further improving the workability of the concrete.
In a second aspect, the application provides a preparation method of high polymer environment-friendly recycled concrete, which adopts the following technical scheme: a preparation method of a high polymer environment-friendly recycled concrete comprises the following steps:
s1, crushing the waste concrete, screening fragments with continuous aggregate particle sizes of 10-20mm, soaking the fragments in a lac glue solution for 24 hours, taking out and drying to obtain coarse aggregate for later use;
s2, uniformly mixing the fine aggregate, the cement, the slag powder and the fly ash, and then adding the coarse aggregate to obtain an aggregate mixture;
and S3, adding water and the polycarboxylate superplasticizer into the aggregate mixture in sequence under stirring to obtain the high polymer environment-friendly recycled concrete.
Preferably, in the step S1, the waste concrete is crushed, crushed blocks with continuous particle sizes of 10-20mm are screened out, the modified amine curing agent is adsorbed into cracks inside the crushed blocks by a vacuum impregnation method, and then shellac is sprayed and dried to obtain coarse aggregate for later use; in the step S2, the fine aggregate, cement, slag powder, fly ash, epoxy resin and sodium borate are mixed uniformly and then added with the coarse aggregate to obtain an aggregate mixture.
By adopting the technical scheme, the method has the advantages that,
in summary, the present application has the following beneficial effects:
1. utilize the cladding of high polymer shellac at regeneration coarse aggregate surface, when mixing concrete, can improve the smoothness on regeneration coarse aggregate surface, thereby reduce the frictional force between regeneration coarse aggregate and other aggregates, and then improve the workability of concrete, mix after finishing, utilize sodium borate can dissolve the shellac membrane fast, make the modified amine curing agent of embedment flow out in the regeneration coarse aggregate crack, the epoxy in modified amine curing agent and the concrete base member combines the postcure, can promote the condensation of concrete, thereby play the effect of shortening the concrete setting time.
Detailed Description
The present application will be described in further detail with reference to examples.
The raw materials of the present application are obtained by home-made or commercial sources, and the specific sources are shown in table 1.
TABLE 1
| Name (R) | Specification/batch number | Source |
| Coarse aggregate (self-made regeneration coarse aggregate stone) | 10-20mm continuous gradation | / |
| Coarse aggregate (self-made regeneration coarse aggregate stone) | 10-25mm continuous gradation | / |
| Fine aggregate (river sand) | / | Shenzhen Shenbao industry building materials Co Ltd |
| Fine aggregate (machine-made medium sand) | Fineness modulus 2.7 | Shenzhen Shenbao industry building materials Co Ltd |
| Water (W) | / | / |
| Cement | P.O425R | Shenzhen Shenbao industry building materials Co Ltd |
| Fly ash | Class F class II | Shenzhen Shenbao industry building materials Co Ltd |
| Slag powder | / | Shenzhen Shenbao industry building materials Co Ltd |
| Polycarboxylic acid water reducing agent | AR | |
| Lac | Pharmaceutical grade | Wuhan La Na Bai pharmaceutical chemical Co Ltd |
| Dewaxing lac | AR | Wuhan La Na Bai pharmaceutical chemical Co Ltd |
| Epoxy resin | AR | Guangzhou hundred million a kind of jade flourishing chemical Co., Ltd |
| Sodium borate | AR | Guangzhou Congress chemical technology Co Ltd |
| Anhydrous ethanol | AR | Shandong vitamin evolution technology Co Ltd |
| Hydroxypropyl methylcellulose | AR | Guangzhou Chengxin chemical Co., Ltd |
| Modified aromatic amine curing agent | AR | Shenzhen Shuhui speciality chemical Co Ltd |
The self-made recycled coarse aggregate is obtained by crushing waste concrete blocks through a crusher and then screening particles with the particle size within the range of 5-15 mm.
Preparation example of coarse aggregate
Preparation example 1
A preparation method of coarse aggregate comprises the following steps:
crushing the waste concrete by a crusher, screening fragments with the particle size of 10-25mm in a continuous aggregation manner, soaking the fragments in the glue solution of the lac for 24 hours, taking out and drying to obtain coarse aggregate for later use.
Preparation example 2
A preparation method of a coarse aggregate comprises the steps of crushing waste concrete, screening fragments with continuous particle sizes of 10-25mm, adsorbing for 45min under the pressure of-0.08 MPa by a vacuum impregnation method, adsorbing a modified amine curing agent into cracks in the fragments, spraying lac, and drying to obtain the coarse aggregate for later use.
Preparation example 3
A preparation method of a coarse aggregate comprises the steps of crushing waste concrete, screening fragments with continuous particle sizes of 10-25mm, adsorbing for 45min under the pressure of-0.08 MPa by a vacuum impregnation method, adsorbing a modified amine curing agent into cracks in the fragments, spraying dewaxing shellac, and drying to obtain the coarse aggregate for later use.
Preparation example 4
A method for preparing regenerated coarse aggregate comprises screening out 10-20mm fragments with continuous aggregate particle size, soaking the fragments in lac glue solution for 24h, taking out, and drying to obtain coarse aggregate.
Preparation example 5
Crushing the waste concrete, screening out fragments with the particle size of 10-25mm in a continuous aggregation manner, soaking the fragments in water for 24 hours, taking out and drying to obtain coarse aggregate for later use.
Examples
The components and ratios in the examples are shown in Table 2.
TABLE 2
The preparation method of the above example is as follows:
examples 1 to 3
A preparation method of high polymer environment-friendly recycled concrete comprises the following steps:
s1, adding the sand, the cement, the slag powder and the fly ash in the machine-made materials into a stirrer according to the weight parts in the table 2, stirring uniformly, adding the coarse aggregate prepared in the preparation example 1, and stirring uniformly to obtain an aggregate mixture;
and S2, adding water and the polycarboxylate superplasticizer into the aggregate mixture in sequence under stirring, and stirring uniformly to obtain the high polymer environment-friendly recycled concrete.
Example 4
The preparation method of the high polymer environment-friendly recycled concrete is different from the preparation method of the embodiment 1 in that: in the step S1, the sand, cement, slag powder and fly ash in the machine-made process are added into a stirrer and stirred evenly according to the parts by weight in table 2, and then the coarse aggregate prepared in preparation example 3 is added and stirred evenly to obtain an aggregate mixture.
Examples 5 to 6
The preparation method of the high polymer environment-friendly recycled concrete is different from the preparation method of the embodiment 1 in that: in the step S1, the sand, cement, slag powder, fly ash, epoxy resin and sodium borate in the machine-made process are added into a stirrer and stirred evenly according to the parts by weight in table 2, and then the coarse aggregate prepared in preparation example 2 is added and stirred evenly to obtain an aggregate mixture.
Examples 7 to 8
The preparation method of the high polymer environment-friendly recycled concrete is different from the preparation method of the embodiment 1 in that: in the step S1, according to the parts by weight in table 2, the machine-made sand, cement, slag powder, fly ash, epoxy resin, sodium borate and ethanol are added into a mixer and stirred uniformly, then the coarse aggregate prepared in preparation example 2 is added and stirred uniformly to obtain an aggregate mixture.
Example 9
The difference between the preparation method of the high polymer environment-friendly recycled concrete and the preparation method of the high polymer environment-friendly recycled concrete in the embodiment 1 is that: s1, adding river sand, cement, slag powder and fly ash into a stirrer, stirring uniformly, adding the coarse aggregate prepared in the preparation example 1, and stirring uniformly to obtain an aggregate mixture
Example 10
The difference between the preparation method of the high polymer environment-friendly recycled concrete and the preparation method of the high polymer environment-friendly recycled concrete in the embodiment 1 is that: in the step S1, the fine aggregate, cement, slag powder, fly ash, epoxy resin, sodium borate and ethanol are added into a mixer in parts by weight in table 2 and stirred uniformly, and then the coarse aggregate prepared in preparation example 4 is added and stirred uniformly to obtain an aggregate mixture.
Comparative example
The components and ratios in each proportion are shown in table 3.
TABLE 3
The preparation method of the above comparative example was:
comparative example 1
The preparation method of the high polymer environment-friendly recycled concrete is different from the preparation method of the embodiment 2 in that: according to the parts by weight in the table 2, the sand, the cement, the slag powder and the fly ash in the machine are added into a stirrer and stirred uniformly, then the coarse aggregate prepared in the preparation example 5 is added and stirred uniformly, and an aggregate mixture is obtained.
Comparative example 2
The difference between the high polymer environment-friendly recycled concrete and the preparation method thereof and the preparation method of the embodiment 2 is that: s1, adding the sand, the cement, the slag powder, the fly ash and the hydroxypropyl methyl cellulose in the machine-made materials into a stirrer according to the weight parts in the table 2, stirring uniformly, adding the coarse aggregate prepared in the preparation example 5, and stirring uniformly to obtain an aggregate mixture;
and S2, adding water and the polycarboxylate superplasticizer into the aggregate mixture in sequence under stirring, and stirring uniformly to obtain the high polymer environment-friendly recycled concrete.
Detection method
1. Slump: and (3) testing the slump of the concrete mixture when the concrete mixture is taken out of the machine and after 2 hours according to GB/T50080-2016 standard of performance test method of common concrete mixtures.
2. Setting time: the initial setting time and the final setting time of the concrete mixture are tested according to GB/T50080-2016 standard of common concrete mixture performance test method.
Test results
The performance test results of the high polymer environment-friendly recycled concrete prepared by the above embodiments and the preparation method thereof are shown in table 4:
TABLE 4
The performance test results of the high polymer environment-friendly recycled concrete prepared according to the proportions and the preparation method thereof are shown in Table 5:
TABLE 5
1. As can be seen by combining examples 1-10 and comparative example 1 and combining tables 2-5, the slump of the discharged concrete is greater than that of comparative example 1 in examples 1-10, and the workability of examples 1-10 is better than that of comparative example 1, which proves that the smoothness of the surface of the recycled coarse aggregate can be improved by coating the high polymer shellac on the surface of the recycled coarse aggregate, so that the friction between the recycled coarse aggregate and other aggregates is reduced, and the workability of concrete is improved. Meanwhile, the initial setting time and the final setting time of examples 1 to 10 are similar to those of comparative example 1, and it can be seen that since no viscosity modifier is introduced, the possibility of affecting the setting time of concrete is reduced, and thus, the effect of reducing the effect on the setting time of concrete while improving the workability of recycled concrete is obtained.
2. Combining examples 1-10 and comparative example 2 and tables 2-5, it can be seen that the slump of the concrete of examples 1-10 is not much different from that of comparative example 2, but the initial setting time and the final setting time of comparative example 2 are much longer than those of examples 1-10, and it can be seen that although the addition of the viscosity modifier, hydroxypropyl methylcellulose can ensure the workability of the concrete, it can affect the setting of the concrete.
3. As can be seen by combining the example 4 and the example 1 and combining the tables 2 to 5, the machine-outlet slump of the example 4 is greater than that of the example 1, which shows that the dewaxing shellac coated on the surface of the coarse aggregate can be more firmly attached to the regenerated coarse bone, the possibility that the film layer coated on the regenerated coarse aggregate is broken by impact when the concrete is coated is reduced, the possibility that the film layer is damaged is reduced, and the workability of the concrete is further improved.
4. It can be seen from the combination of examples 5-6 and example 1 and tables 2-5 that the initial setting time and the final setting time of examples 5-6 are both less than those of example 1 and the slump of the concrete is similar, and it can be seen that after the mixing is finished, the sodium borate can rapidly dissolve the shellac film, so that the modified amine filled in the cracks generated in the crushing process of the recycled coarse aggregate flows out, and the modified amine is combined with the epoxy resin in the concrete matrix and then hardened, so that the coagulation of the concrete can be promoted, and the effect of shortening the coagulation time of the concrete can be achieved.
5. As can be seen by combining examples 7-8 and 6 with tables 2-5, the initial setting time and final setting time of examples 7-8 are less than those of example 1, indicating that shellac is better soluble in the sodium borate-alcohol system and forms polymers, further improving the hardening effect and shortening the setting time of concrete.
6. By combining example 9 and example 1 and tables 2 to 5, it can be seen that the machine-exiting slump of example 9 is greater than that of example 1, and that the river sand has a round shape and smaller friction with other aggregates of the concrete, which is beneficial to further improving the workability of the concrete.
7. By combining the example 10 and the example 1 and combining the tables 2 to 5, the machine-outlet slump of the example 10 is higher than that of the example 1, and it can be seen that when the particle size of the coarse aggregate is continuously gathered at 10-20mm, the coarse aggregate is more easily coated by the lac, and the edge angle is smaller, which is beneficial to improving the workability of concrete.
The present embodiment is only for explaining the present application, and it is not limited to the present application, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present application.
Claims (8)
1. The high polymer environment-friendly recycled concrete is characterized by comprising the following components in parts by weight: 980 parts of coarse aggregate, 680 parts of 630 parts of fine aggregate, 380 parts of cement, 60-80 parts of slag powder, 110 parts of fly ash, 170 parts of 155 parts of water and 2-5 parts of polycarboxylic acid water reducer, wherein the coarse aggregate is regenerated coarse aggregate with a purple adhesive film wrapped on the surface.
2. The high polymer environmentally friendly recycled concrete of claim 1, wherein: the violet glue film is a dewaxing violet glue film.
3. The high polymer environmentally friendly recycled concrete of claim 1, wherein: the coating also comprises 30-50 parts by weight of epoxy resin and 20-35 parts by weight of sodium borate, wherein the coarse aggregate is regenerated coarse aggregate which is encapsulated with a modified amine curing agent and the surface of which is wrapped with a violet glue film.
4. The high polymer environmentally friendly recycled concrete of claim 3, wherein: also comprises 10-15 parts by weight of ethanol.
5. The high polymer environmentally friendly recycled concrete of claim 1, wherein: the particle size of the coarse aggregate is 10-20mm, and the coarse aggregate is continuously prepared in a concentrated manner.
6. The high polymer environmentally friendly recycled concrete of claim 1, wherein: the fine aggregate is river sand.
7. The method for preparing the high polymer environment-friendly recycled concrete according to claim 1, comprising the following steps:
s1, crushing the waste concrete, screening fragments with continuous aggregate particle sizes of 10-20mm, soaking the fragments in a lac glue solution for 24 hours, taking out and drying to obtain coarse aggregate for later use;
s2, uniformly mixing the fine aggregate, the cement, the slag powder and the fly ash, and then adding the coarse aggregate to obtain an aggregate mixture;
and S3, adding water and the polycarboxylate superplasticizer into the aggregate mixture in sequence under stirring to obtain the high polymer environment-friendly recycled concrete.
8. The method for preparing the high polymer environment-friendly recycled concrete according to claim 7, wherein: in the step S1, crushing the waste concrete, screening fragments with continuous particle sizes of 10-20mm, adsorbing the modified amine curing agent into cracks in the fragments by a vacuum impregnation method, spraying lac, and drying to obtain coarse aggregate for later use; in the step S2, the fine aggregate, cement, slag powder, fly ash, epoxy resin and sodium borate are mixed uniformly and then added with the coarse aggregate to obtain an aggregate mixture.
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Cited By (1)
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| CN113651579A (en) * | 2021-08-31 | 2021-11-16 | 深圳市永恒业混凝土有限公司 | High polymer environment-friendly recycled concrete and preparation method thereof |
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