CN114262193A - Concrete cementing aggregate, preparation method and application thereof - Google Patents
Concrete cementing aggregate, preparation method and application thereof Download PDFInfo
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- CN114262193A CN114262193A CN202111669244.5A CN202111669244A CN114262193A CN 114262193 A CN114262193 A CN 114262193A CN 202111669244 A CN202111669244 A CN 202111669244A CN 114262193 A CN114262193 A CN 114262193A
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Abstract
The invention discloses a concrete cemented aggregate, a preparation method and an application thereof, wherein the concrete cemented aggregate comprises the following components in parts by weight: 15-25% of cement, 0-10% of cementing material, 0-3.7% of pigment, 67-75% of aggregate, 0.05-2.2% of binder and 0.1-0.48% of dispersing agent. The concrete cementing aggregate comprises cement, cementing materials, pigments, aggregates, binders and dispersing agents, and the finished product has the characteristics of through pores, water permeability and high storability.
Description
Technical Field
The invention belongs to the technical field of concrete, and particularly relates to a concrete cemented aggregate, and a preparation method and application thereof.
Background
The pervious concrete paving material can make rainwater flow into the ground, effectively supplement underground water, relieve urban environmental problems such as rapid decline of urban underground water level and the like, effectively eliminate harm of oil compounds on the ground to environmental pollution, protect underground water, maintain ecological balance, relieve urban heat island effect, and is beneficial to benign development of human living environment and urban rainwater management and water pollution prevention and treatment.
The pervious concrete is also called porous concrete, sand-free concrete or pervious terrace, is porous light concrete mixed by aggregate, cement, cementing agent and water, and does not contain fine aggregate. The pervious concrete is a honeycomb structure with uniformly distributed holes formed by coating a thin layer of cement slurry or cementing materials on the surface of aggregate and bonding the thin layer of cement slurry or the cementing materials, and has the characteristics of air permeability, water permeability and light weight. The pervious concrete is widely popularized in various cities and obtains wide social benefits according to the decoration styles required by different environments and individualities.
The prepared concrete on the market can basically meet the strength requirement, but the defect of poor permeability is usually existed. Current concrete production generally includes: firstly, adding cement and aggregate into a stirrer, then adding half of the water, stirring, then adding additives (additives, pigments and the like), stirring, finally adding the residual water, stirring and discharging, then performing subsequent construction such as paving, vibrating, plastering, maintaining and the like, and having the following defects: 1. the permeable concrete material semi-finished product is produced and ready to use, and the product has time limit in use; 2. aggregate, cement, cementing material, pigment and other materials are used for on-site stirring, construction dust is serious, air and ground are polluted, and solid waste and other garbage are generated; 3. the water adding amount is not easy to control during stirring, and the permeable concrete semi-finished product has poor adhesive capacity, and the construction quality and the water permeability are not easy to control; 4. the field stirring needs water, electricity, raw materials, stirring equipment and other equipment, the labor is more, the production efficiency is low, and the labor intensity is high.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a concrete cemented aggregate, a preparation method and application thereof aiming at the defects of the prior art. The invention provides a concrete cementing aggregate comprising cement, cementing material, pigment, aggregate, binder and dispersant, and the finished product has the characteristics of through pores, water permeability and high storability.
In order to solve the technical problems, the invention adopts the technical scheme that: the concrete cementitious aggregate is characterized by comprising the following components in parts by weight: 15-25% of cement, 0-10% of cementing material, 0-3.7% of pigment, 67-75% of aggregate, 0.05-2.2% of binder and 0.1-0.48% of dispersing agent.
The concrete cementing aggregate is characterized in that the cement is one or more of Portland cement, ordinary Portland cement with the strength grade of more than or equal to 42.5 and aluminate cement.
The concrete cementitious aggregate is characterized in that the cementitious material comprises a mixture of silica, epoxy resin and stearate.
The concrete cementitious aggregate is characterized in that the pigment is one or more of inorganic mineral pigment and organic pigment.
The concrete cementing aggregate is characterized in that the aggregate is single-particle-size aggregate, and the apparent density of the aggregate is more than 2500kg/m3The grain diameter is not less than 0.6mm and not more than 9.5 mm.
The concrete cementing aggregate is characterized in that the binder is one or more of epoxy resin, a curing agent and building glue powder.
The concrete cementitious aggregate is characterized in that the dispersant is polycarboxylic acid dry powder or lignosulfonate.
Further, the present invention provides a method for preparing the above concrete cementitious aggregate, characterized by comprising:
step one, mixing cement and a dispersing agent to obtain a material A;
step two, adding the binder into the aggregate, and stirring for 30-45 s to obtain a material B;
step three, adding the material A obtained in the step one into the material B obtained in the step two, and stirring for 30-45 s to obtain a material C;
screening the material C in the step three, wherein oversize materials are the material D;
and step five, drying the material D in the step four to obtain the concrete cemented aggregate.
Furthermore, the invention also provides a construction method applying the concrete cementitious aggregate, which is characterized by comprising the following steps:
step one, paving the concrete cementing aggregate on site according to a designed compaction coefficient;
step two, spraying water on the concrete cemented aggregate paved in the step one to wet the surface and the interior of the concrete cemented aggregate;
step three, when no water mark exists on the surface of the concrete bond aggregate after spraying in the step two, vibrating, leveling, plastering, coating, moisturizing and maintaining;
step four, drying and coating a treating agent; the treating agent is a finishing agent, a finish paint or a protective agent; the drying time is more than three days.
The method is characterized in that the curing time in the step three is 7 to 14 days.
Compared with the prior art, the invention has the following advantages:
1. the invention provides a concrete cementing aggregate comprising cement, cementing material, pigment, aggregate, binder and dispersant, which can be stored for a long time and has the characteristics of high water permeability and high storability.
2. The concrete cementitious aggregate can be paved without stirring in the application process, so that the limitation of factors such as construction time and the like is reduced.
3. In the application process of the concrete cementitious aggregate, the concrete cementitious aggregate can be subjected to subsequent construction by spraying the surface after being paved, and the water-to-glue ratio is lower by 0.2-0.5 compared with that of the traditional pervious concrete.
4. The invention provides a method for applying the concrete cementing aggregate, which comprises the steps of spreading, spraying, vibrating and leveling, plastering, film covering and moisturizing maintenance, drying and coating a treating agent, and can effectively ensure the adhesion of powder and the aggregate and avoid the situations of slurry flowing, weak adhesion surface, bottom layer blockage and the like of pervious concrete.
5. The method for cementing the aggregate by using the concrete can reduce the influence caused by site construction by pre-stirring, and has the advantages of water permeability meeting the design range, high efficiency, low cost and little pollution.
6. The method for cementing the aggregate by using the concrete can regulate the thickness of the powder adhesive layer on the surface of the aggregate and control the strength of the pervious concrete.
The technical solution of the present invention is further described in detail with reference to the accompanying drawings and embodiments.
Drawings
FIG. 1 is a flow chart of the present invention for preparing and using concrete cementitious aggregates.
FIG. 2 is a topographical view of Material B of example 4.
FIG. 3 is a topographical view of Material D of example 4.
FIG. 4 is a hardened topography of the concrete cementitious aggregate of example 4.
FIG. 5 is a hardened topography of the concrete cementitious aggregate of example 5.
FIG. 6 is a schematic view showing the water permeability of the concrete cementitious aggregate in example 5.
Detailed Description
The invention provides a concrete cementing aggregate which comprises the following components in parts by weight: 15-25% of cement, 0-10% of cementing material, 0-3.7% of pigment, 67-75% of aggregate, 0.05-2.2% of binder and 0.1-0.48% of dispersing agent.
In the concrete cementing aggregate, the cement is one or more of Portland cement, ordinary Portland cement with the strength grade of more than or equal to 42.5 and aluminate cement.
In the above concrete cementitious aggregate of the present invention, the cementitious material comprises a mixture of silica, epoxy resin and stearate.
In the concrete cementitious aggregate of the invention, the pigment is one or more of inorganic mineral pigment and organic pigment. For example, the inorganic mineral pigment may be a peacock blue pigment from the national FLY (Stone aircraft building materials Co., Ltd.), and the organic pigment may be an orange organic pigment from Kayin chemical company of Shanghai.
In the concrete cementing aggregate, the aggregate is a single-particle-diameter aggregate, and the apparent density of the aggregate is more than 2500kg/m3The grain diameter is not less than 0.6mm and not more than 9.5 mm.
In the concrete cementing aggregate, the binder is one or more of epoxy resin, a curing agent and building glue powder.
In the concrete cementitious aggregate of the invention, the dispersant is polycarboxylic acid dry powder or lignosulfonate.
In addition, the invention also provides a method for preparing the concrete cemented aggregate, which comprises the following steps:
step one, mixing cement and a dispersing agent to obtain a material A; when the concrete cementing aggregate contains the cementing material and/or the pigment, the step one also comprises adding the cementing material and/or the pigment before mixing;
step two, adding the binder into the aggregate, and stirring for 30-45 s to obtain a material B;
step three, adding the material A obtained in the step one into the material B obtained in the step two, and stirring for 30-45 s to obtain a material C;
screening the material C in the step three, wherein oversize materials are the material D;
and step five, drying the material D in the step four to obtain the concrete cemented aggregate.
Further, the invention also provides a construction method of the concrete cemented aggregate, which comprises the following steps:
step one, paving the concrete cementing aggregate on site according to a designed compaction coefficient;
step two, spraying water on the concrete cemented aggregate paved in the step one to wet the surface and the interior of the concrete cemented aggregate;
step three, when no water mark exists on the surface of the concrete bond aggregate after spraying in the step two, vibrating, leveling, plastering, coating, moisturizing and maintaining; the curing time is 7 to 14 days;
step four, drying and coating a treating agent; the treating agent is a finishing agent, a finish paint or a protective agent; the drying time is more than three days.
The present invention will be described in detail with reference to the following examples, which are not intended to limit the present invention.
A series of concrete cementitious aggregates were prepared according to the method of the present invention as follows.
Example 1
The embodiment provides a concrete cemented aggregate, which comprises the following components in parts by weight: 15% of cement, 5% of cementing material, 3.7% of pigment, 74% of aggregate, 2.2% of binder and 0.1% of dispersant.
In the concrete cementitious aggregate of the present embodiment, the cement is portland cement, the strength grade is 52.5, and the color of the portland cement is white.
In the concrete cementitious aggregate described above in this example, the cementitious material is a cementitious material containing the above components, which is purchased from trishenne sponge city science and technology development ltd in south of the lake, and the cementitious material includes silica powder, epoxy resin, and stearate.
In the concrete cementitious aggregate described above in this example, the pigment is an inorganic mineral pigment.
In the concrete-bonded aggregate of the present embodiment, the aggregate is a single-particle-diameter aggregate, and the apparent density of the aggregate is 2700kg/m3The grain diameter is not less than 2.36mm and not more than 4.75 mm.
In the concrete cementitious aggregate of this embodiment, the binder is 601 epoxy resin and a curing agent, the curing agent is a commonly used curing agent for epoxy resin, such as a high polymer curing agent, and a mass ratio of the 601 epoxy resin to the curing agent may be 1: 1.
in the concrete cementitious aggregate of this embodiment, the dispersant is a dry powder of polycarboxylic acid.
This example provides a method of preparing the above concrete cementitious aggregate, the process flow being shown in figure 1, comprising:
step one, mixing cement, cementing materials, dispersing agents and pigments to obtain a material A;
step two, adding the binder into the aggregate, and stirring for 35s to obtain a material B;
step three, adding the material A obtained in the step one into the material B obtained in the step two, and stirring for 30s to obtain a material C;
screening the material C obtained in the step three by using a square-hole sieve, wherein oversize materials are materials D; the aperture of a screen mesh used for screening is 2.36 mm;
step five, drying the material D in the step four to obtain concrete cementing aggregate; the drying temperature is 50 ℃, and the concrete cemented aggregate can be stored and transported after being packaged.
Example 2
The embodiment provides a concrete cemented aggregate, which comprises the following components in parts by weight: 25% of cement, 0% of cementing agent, 0% of pigment, 73% of aggregate, 0.05% of binder, 0.1% of dispersant and 1.85% of water.
In the concrete-bonded aggregate of the present example, the cement was ordinary portland cement and the strength grade was 42.5. The cement of the embodiment can also be special cement, such as CA-50 aluminate cement or sulphoaluminate cement.
In the concrete-bonded aggregate of the present embodiment, the aggregate is a single-particle-diameter aggregate, and the apparent density of the aggregate is 2700kg/m3The grain diameter is not less than 2.36mm and not more than 4.75 mm.
In the concrete cementitious aggregate of the embodiment, the binder is building glue powder.
In the concrete cementitious aggregate of this embodiment, the dispersant is a dry powder of polycarboxylic acid.
This example provides a method of preparing the above concrete cementitious aggregate, comprising:
step one, mixing cement and a dispersing agent to obtain a material A;
adding a binder into water to obtain a binder system, adding the binder system into the aggregate, and stirring for 35 seconds to obtain a material B;
step three, adding the material A obtained in the step one into the material B obtained in the step two, and stirring for 30s to obtain a material C;
screening the material C obtained in the step three by using a square-hole sieve, wherein oversize materials are materials D; the aperture of a screen mesh used for screening is 2.36 mm;
step five, drying the material D in the step four to obtain concrete cementing aggregate; the drying temperature is 50 ℃, and the concrete cemented aggregate can be stored and transported after being packaged.
Example 3
The embodiment provides a concrete cemented aggregate, which comprises the following components in parts by weight: 19.42 percent of cement, 10 percent of cementing agent, 0 percent of pigment, 67 percent of aggregate, 0.1 percent of binder, 0.48 percent of dispersant and 3 percent of water.
In the concrete-bonded aggregate of the present example, the cement was portland cement, and the strength grade was 52.5.
In the concrete cementitious aggregate of this embodiment, the cementitious material is a mixture of silica, epoxy resin, and stearate, and in the mixture, the mass percentage content of silica powder is 85%, the mass percentage content of epoxy resin powder is 5%, and the mass percentage content of stearate is 10%.
In the concrete-bonded aggregate of the present embodiment, the aggregate is a single-particle-diameter aggregate, and the apparent density of the aggregate is 2700kg/m3The grain diameter is not less than 0.6mm and not more than 1.18 mm.
In the concrete cementitious aggregate of the embodiment, the binder is building glue powder.
In the concrete cementitious aggregate of this embodiment, the dispersant is calcium lignosulfonate.
This example provides a method of preparing the above concrete cementitious aggregate, comprising:
step one, mixing cement, a cementing material and a dispersing agent to obtain a material A;
adding a binder into water to obtain a binder system, adding the binder system into the aggregate, and stirring for 30s to obtain a material B;
step three, adding the material A obtained in the step one into the material B obtained in the step two, and stirring for 30s to obtain a material C;
screening the material C obtained in the step three by using a square-hole sieve, wherein oversize materials are materials D; the aperture of the screen mesh used for screening is 0.6 mm;
step five, drying the material D in the step four to obtain concrete cementing aggregate; the drying temperature is 50 ℃, and the concrete cemented aggregate can be stored and transported after being packaged.
Example 4
The embodiment provides a concrete cemented aggregate, which comprises the following components in parts by weight: 22.5% of cement, 0% of cementing agent, 0% of pigment, 75% of aggregate, 0.07% of binder, 0.13% of dispersant and 2.3% of water.
In the concrete-bonded aggregate of the present embodiment, the cement is a mixture of portland cement and aluminate cement, the strength grade of the portland cement is 52.5 grade, the strength grade of the aluminate cement is CA-50 grade, and the mass ratio of the portland cement to the aluminate cement is 1: 1.
in the concrete-bonded aggregate of the present embodiment, the aggregate is a single-particle-diameter aggregate, and the apparent density of the aggregate is 2700kg/m3The grain diameter is not less than 1.18mm and not more than 2.36 mm.
In the concrete cementitious aggregate of the embodiment, the binder is building glue powder.
In the concrete cementitious aggregate of this embodiment, the dispersant is a dry powder of polycarboxylic acid.
This example provides a method of preparing the above concrete cementitious aggregate, comprising:
step one, mixing cement and a dispersing agent to obtain a material A;
adding a binder into water to obtain a binder system, adding the binder system into aggregate, and stirring for 45s to obtain a material B; the morphology of material B is shown in FIG. 2;
step three, adding the material A obtained in the step one into the material B obtained in the step two, and stirring for 45s to obtain a material C;
screening the material C obtained in the step three by using a square-hole sieve, wherein oversize materials are materials D; the aperture of a screen mesh used for screening is 1.18 mm; the morphology of material D is shown in FIG. 3;
step five, drying the material D in the step four to obtain concrete cemented aggregate, wherein the appearance of the concrete cemented aggregate is shown in figure 4; the drying temperature is 50 ℃, and the concrete cemented aggregate can be stored and transported after being packaged.
Example 5
The embodiment provides a concrete cemented aggregate, which comprises the following components in parts by weight: 23.12% of cement, 0% of cementing agent, 0% of pigment, 75% of aggregate, 0.05% of binder, 0.13% of dispersant and 1.7% of water.
In the concrete-bonded aggregate of the present example, the cement is portland cement, and the strength grade is 52.5 grade.
In the concrete-bonded aggregate of the present embodiment, the aggregate is a single-particle-diameter aggregate, and the apparent density of the aggregate is 2700kg/m3The grain diameter is not less than 4.75mm and not more than 9.5 mm.
In the concrete cementitious aggregate of the embodiment, the binder is building glue powder.
In the concrete cementitious aggregate of this embodiment, the dispersant is a dry powder of polycarboxylic acid.
This example provides a method of preparing the above concrete cementitious aggregate, comprising:
step one, mixing cement and a dispersing agent to obtain a material A;
adding a binder into water to obtain a binder system, adding the binder system into aggregate, and stirring for 45s to obtain a material B;
step three, adding the material A obtained in the step one into the material B obtained in the step two, and stirring for 40s to obtain a material C;
screening the material C obtained in the step three by using a square-hole sieve, wherein oversize materials are materials D; the aperture of a screen mesh used for screening is 4.75 mm;
step five, drying the material D in the step four to obtain concrete cementing aggregate; the drying temperature is 50 ℃, and the concrete cemented aggregate can be stored and transported after being packaged.
Application example
The application example provides a construction method of the concrete cementitious aggregate, and the flow is shown in figure 1, and the construction method specifically comprises the following steps:
step one, paving the concrete cementing aggregate on site according to a designed compaction coefficient;
step two, spraying water on the concrete cemented aggregate paved in the step one to wet the surface and the interior of the concrete cemented aggregate; the mass of the water for spraying and sprinkling is 6.2-6.5% of the mass of the concrete bond aggregate;
step three, when no water mark exists on the surface of the concrete bond aggregate after spraying in the step two, vibrating, leveling, plastering, coating, moisturizing and maintaining; the curing time is 7 to 14 days;
step four, drying and coating a treating agent; the treating agent is a finishing agent, a finish paint or a protective agent; the drying time is more than three days. The appearance of the concrete cementitious aggregate coated with the treating agent in example 4 is shown in fig. 4, the appearance of the concrete cementitious aggregate coated with the treating agent in example 5 is shown in fig. 5, and the water permeability effect of the concrete cementitious aggregate in example 5 is shown in fig. 6.
Performance evaluation:
the test results of the concrete cementitious aggregate performance test obtained in the embodiments 1-5 of the invention and the test results of the on-site final test are shown in table 1.
Table 1 examples 1-5 concrete cementitious aggregate performance test and field final test results
| Detecting items | 28 days compressive strength (MPa) | Water permeability coefficient (mm/s) for 28 days |
| Example 1 | 32.6 | 4.5 |
| Example 2 | 31.5 | 4.4 |
| Example 3 | 29.7 | 3.3 |
| Example 4 | 30.2 | 3.9 |
| Example 5 | 34.7 | 5.6 |
As can be seen from Table 1, the concrete cementitious aggregate of the invention meets the requirements of designing the strength grade of C25 and the water permeability coefficient grade of not less than K3, the strength actually obtained in the embodiment reaches the design value of 119-139%, the water permeability coefficient grade is more than K3, and all detected performance indexes meet the design requirements.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and all simple modifications, changes and equivalent structural changes made to the above embodiment according to the technical spirit of the present invention still fall within the protection scope of the technical solution of the present invention.
Claims (10)
1. The concrete cementitious aggregate is characterized by comprising the following components in parts by weight: 15-25% of cement, 0-10% of cementing material, 0-3.7% of pigment, 67-75% of aggregate, 0.05-2.2% of binder and 0.1-0.48% of dispersing agent.
2. The concrete cementitious aggregate according to claim 1, wherein the cement is one or more of portland cement, ordinary portland cement having a strength grade of 42.5 or more, and aluminate cement.
3. A concrete cementitious aggregate according to claim 1, wherein the cementitious material comprises a mixture of silica, epoxy and stearate.
4. A concrete cementitious aggregate according to claim 1, characterised in that the pigment is one or more of an inorganic mineral pigment and an organic pigment.
5. A concrete cementitious aggregate according to claim 1, characterised in that the aggregate is a single particle size aggregate having an apparent density of > 2500kg/m3The grain diameter is not less than 0.6mm and not more than 9.5 mm.
6. The concrete cementitious aggregate of claim 1, wherein the binder is one or more of epoxy resin, curing agent and building glue powder.
7. A concrete cementitious aggregate according to claim 1, characterised in that the dispersant is a dry powder of a polycarboxylic acid or a lignosulphonate.
8. A method of preparing a concrete cementitious aggregate according to any one of claims 1 to 7, comprising:
step one, mixing cement and a dispersing agent to obtain a material A;
step two, adding the binder into the aggregate, and stirring for 30-45 s to obtain a material B;
step three, adding the material A obtained in the step one into the material B obtained in the step two, and stirring for 30-45 s to obtain a material C;
screening the material C in the step three, wherein oversize materials are the material D;
and step five, drying the material D in the step four to obtain the concrete cemented aggregate.
9. A method of constructing a concrete cementitious aggregate according to any one of claims 1 to 6, comprising:
step one, paving the concrete cementing aggregate on site according to a designed compaction coefficient;
step two, spraying water on the concrete cemented aggregate paved in the step one to wet the surface and the interior of the concrete cemented aggregate;
step three, when no water mark exists on the surface of the concrete bond aggregate after spraying in the step two, vibrating, leveling, plastering, coating, moisturizing and maintaining;
step four, drying and coating a treating agent; the treating agent is a finishing agent, a finish paint or a protective agent.
10. The method of claim 9, wherein the curing time in step three is 7 to 14 days.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101293760A (en) * | 2007-04-28 | 2008-10-29 | 上海固华墙体环保科技有限公司 | Colorful water permeable concrete pavement and construction technique |
| CN104233916A (en) * | 2014-06-27 | 2014-12-24 | 重庆多娇保温材料有限公司 | Preparation method of color ecological permeable floor |
| CN106677003A (en) * | 2016-11-29 | 2017-05-17 | 苏州基业生态园林股份有限公司 | Pervious concrete structure and preparation method thereof |
| CN113152193A (en) * | 2021-04-25 | 2021-07-23 | 中冶南方城市建设工程技术有限公司 | Novel permeable concrete preparation method |
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- 2021-12-30 CN CN202111669244.5A patent/CN114262193B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101293760A (en) * | 2007-04-28 | 2008-10-29 | 上海固华墙体环保科技有限公司 | Colorful water permeable concrete pavement and construction technique |
| CN104233916A (en) * | 2014-06-27 | 2014-12-24 | 重庆多娇保温材料有限公司 | Preparation method of color ecological permeable floor |
| CN106677003A (en) * | 2016-11-29 | 2017-05-17 | 苏州基业生态园林股份有限公司 | Pervious concrete structure and preparation method thereof |
| CN113152193A (en) * | 2021-04-25 | 2021-07-23 | 中冶南方城市建设工程技术有限公司 | Novel permeable concrete preparation method |
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