CN107285686B - Environment-friendly full-permeable pervious concrete based on waste concrete and preparation method thereof - Google Patents
Environment-friendly full-permeable pervious concrete based on waste concrete and preparation method thereof Download PDFInfo
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- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
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- 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
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- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00017—Aspects relating to the protection of the environment
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- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00241—Physical properties of the materials not provided for elsewhere in C04B2111/00
- C04B2111/00284—Materials permeable to liquids
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- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
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- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
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- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/00793—Uses not provided for elsewhere in C04B2111/00 as filters or diaphragms
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- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/40—Porous or lightweight materials
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- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/80—Optical properties, e.g. transparency or reflexibility
- C04B2111/82—Coloured materials
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- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
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Abstract
The invention provides an environment-friendly full-permeable pervious concrete based on waste concrete and a preparation method thereof, and the preparation method comprises the following steps: (1) mixing and stirring 80-93% of waste concrete recycled aggregate, 5-15% of degradable waste plastic particles and 2-7% of water plant sludge drying spherical particles, and adding part of mixing water after uniform mixing until the surface of the aggregate is wet; (2) sequentially adding a cementing material and the mixed liquid of the rest mixing water and the additive until the surface of the mixture is bright, and stopping stirring; (3) and sequentially paving the porous cement stabilizing layer, the underwater permeable surface layer and the water permeable upper surface layer in sequence, and pressing to obtain the environment-friendly full-transmission type colored water permeable concrete. The method adopts cheap waste materials, and has the characteristics of simple preparation process, capability of adsorbing rich nutrient elements in rainwater, high strength, good water permeability, difficulty in blockage and the like.
Description
Technical Field
The invention belongs to the technical field of building materials, and particularly relates to environment-friendly full-permeable pervious concrete based on waste concrete and a preparation method thereof.
Background
With the rapid development of economy and the continuous acceleration of urbanization process in China, the original natural vegetation and bare soil are gradually hardened and covered by water-blocking materials such as buildings, concrete and the like, and the urban ecology is seriously influenced because the compact common concrete lacks breathing property and has poor capability of easily absorbing heat and permeating rainwater. According to the relevant statistical data, under the influence of the statistical data, more than 360 cities in the country suffer from inland inundation in the last three years, and even casualties occur in the cities such as Beijing, Shenzhen, Changsha and the like, so that life and property loss is caused; meanwhile, the urban heat island, ground settlement, water pollution, haze and other ecological disasters frequently occur, and the development of urban social and economic and the normal life of citizens in China are seriously threatened.
Recently, the government of China formally pushes the sponge city construction, and deeply plans the future city construction development mode, wherein the concept of realizing the benign hydrologic cycle of the city and comprehensively promoting the improvement of the city ecology is realized through various technical approaches such as seepage, stagnation, storage, purification and discharge. The permeable pavement system is one of the specific measures under the concept of sponge city, reconstructs virtuous cycle of rainfall-runoff-infiltration-reuse/circulation destroyed by hardened ground, and has important significance for repairing city environment and realizing rainwater resource utilization. Furthermore, the green material properties of the water permeable material itself are more unobtrusive to the "green development" in the current "thirteen-five" planning recommendation. In the other method, the prior art includes that the pervious concrete applied in the market at present is generally a single pervious layer, so that the problems of easy blockage of pervious pores and the like easily occur, and the technical current situation limits the popularization and application of the pervious concrete to a certain extent.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide the fully-permeable pervious concrete with self-increased porosity.
The technical problem to be solved can be implemented by the following technical scheme.
The environment-friendly full-permeable pervious concrete based on the waste concrete is characterized by being prepared by the following steps:
(1) mixing and stirring 80-93% of waste concrete recycled aggregate, 8-15% of degradable waste plastic particles and 2-7% of water plant sludge drying spherical particles according to the mass percentage, and adding part of mixing water after uniform mixing until the surface of the aggregate is wet;
(2) sequentially adding a cementing material and a mixed solution of the rest of mixed water and an additive until the surface of the mixture is bright, and stopping stirring, wherein the mass ratio of the cementing material to the waste concrete recycled aggregate is 1: 3-1: 5;
(3) and sequentially paving the porous cement stabilizing layer, the underwater permeable surface layer and the water permeable upper surface layer in sequence, and pressing to obtain the environment-friendly full-permeable pervious concrete.
As a further improvement of the technical scheme, the waste concrete recycled aggregate comprises recycled aggregate with particle gradation of at least three of 2.36-4.75 mm, 4.75-9.5 mm, 9.5-16.5 mm and 4.75-26.5 mm obtained after crushing and screening waste concrete; the porous cement stabilizing layer is of 4.75-26.5 mm gradation, the water permeable lower layer is of 4.75-9.5 mm gradation or 9.5-16.5 mm gradation, and the water permeable upper layer is of 2.36-4.75 mm gradation.
As a further improvement of the technical proposal, the method also comprises the step of reinforcing the 4.75 mm-9.5 mm gradation or the 9.5 mm-16.5 mm gradation by using a reinforcing agent.
Wherein the reinforcer is one of methyl potassium silicate or water glass, the mass concentration percentage is 3% -45%, and the strengthening time is 3-8 min.
Also as a further improvement of the technical scheme, the additive is a high-efficiency water reducing agent, the high-efficiency water reducing agent is one of a high-efficiency polycarboxylic acid water reducing agent or a naphthalene water reducing agent, and the mass percentage of the high-efficiency polycarboxylic acid water reducing agent or the naphthalene water reducing agent is 0-0.3% of that of the cementing material.
As a further improvement of the technical scheme, the whole stirring time in the steps (1) and (2) is not more than 3 min.
As one of the preferred embodiments of the present invention, the total stirring time in steps (1) and (2) was 2 min.
As a further improvement of the present invention, a colored pigment is added into the water-permeable upper surface layer.
Among them, the colored pigment is preferably iron oxide powder.
As a further improvement of the technical scheme, the cementing material is one or a mixture of more of cement, mineral powder and fly ash.
Another technical problem to be solved by the present invention is to provide a method for preparing an environmentally friendly permeable concrete based on waste concrete, wherein the method comprises the following steps:
(1) mixing and stirring 80-93% of waste concrete recycled aggregate, 5-15% of degradable waste plastic particles and 2-7% of water plant sludge drying spherical particles according to the mass percentage, and adding part of mixing water after uniform mixing until the surface of the aggregate is wet;
(2) sequentially adding cement and mixed liquid of the rest of mixing water and the additive until the surface of the mixture is bright, and stopping stirring, wherein the mass ratio of the cementing material to the waste concrete recycled aggregate is 1: 3-1: 5;
(3) sequentially paving the porous cement stabilizing layer, the water permeable surface layer and the water permeable upper surface layer in sequence, and pressing to obtain the environment-friendly full-transmission type colored pervious concrete;
the waste concrete recycled aggregate comprises recycled aggregate with particle grading of at least three of 2.36-4.75 mm, 4.75-9.5 mm, 9.5-16.5 mm and 4.75-26.5 mm, which are obtained by crushing and screening waste concrete; the porous cement stabilizing layer is of 4.75-26.5 mm gradation, the water permeable lower layer is of 4.75-9.5 mm gradation or 9.5-16.5 mm gradation, and the water permeable upper layer is of 2.36-4.75 mm gradation.
As a further improvement of the method, the method also comprises the step of reinforcing the 4.75 mm-9.5 mm gradation or the 9.5 mm-16.5 mm gradation with a reinforcing agent; the strengthening agent is one of methyl potassium silicate or water glass, the mass concentration percentage is 3% -45%, and the strengthening time is 3-8 min.
Further, the proportion of the additive is 0-0.3% of the cementing material.
The environment-friendly full-permeable pervious concrete based on the recycled aggregate of the waste concrete, which is obtained by adopting the technical scheme, has the following characteristics:
(1) the water permeable porosity of the system is increased from the upper water permeable layer to the lower water permeable layer to the porous cement stabilizing layer, and the small porosity of the upper part can prevent large particles from entering the water permeable system and prevent the system from being blocked;
(2) the built-in degradable waste plastic begins to degrade after being soaked in rainwater, and releases natural pores continuously, so that the porosity of the system is increased continuously;
(3) the built-in water plant sludge drying spherical particles have larger adsorption surface area, can adsorb nutrient elements in rainwater, and reduce water eutrophication;
(4) the water permeable upper surface layer can be added with pigment according to the actual engineering requirements, and the attractiveness of the laid water permeable concrete is improved.
The technical scheme realizes the full-waste materialization of the raw materials, has the characteristics of high strength, good water permeability, environmental protection and the like, and provides a demonstration case for the construction of sponge cities.
Detailed Description
Specific embodiments of the present invention are described in further detail below.
The invention aims to provide the full-transmission type colored pervious concrete with self-increased porosity and the preparation method thereof, and simultaneously, the addition of sludge and the like can absorb nutrient elements in rainwater and reduce the current situation of water eutrophication.
The invention provides an environment-friendly full-transmission type colored pervious concrete based on waste concrete and a preparation method thereof, wherein the preparation method comprises the following steps:
(1) crushing and screening the waste concrete to obtain four kinds of particle graded recycled aggregate of 2.36-4.75 mm, 4.75-9.5 mm, 9.5-16.5 mm and 4.75-26.5 mm; the recycled aggregate of the waste concrete is reinforced by a reinforcer, wherein the thickness of the recycled aggregate is 4.75-9.5 mm, and the thickness of the recycled aggregate is 9.5-16.5 mm; preferably, the reinforcer is one of methyl potassium silicate or water glass, the mass concentration is 3-45%, and the strengthening time is 3-8 min; after the reinforcement, the water absorption of the recycled aggregate is reduced by 2-4%.
(2) Adding the waste concrete recycled aggregate, the degradable waste plastic particles and the water plant sludge drying spherical particles which are in the same grain composition into a stirrer together according to a certain ratio, mixing and stirring, adding part of mixing water after uniform mixing, sequentially adding the cement and the mixed liquid of the rest mixing water and the additive after the surface of the aggregate is wet, stopping stirring until the surface of the mixture is shiny, and preferably stirring for 3 min; when in laying, the porous cement stabilizing layer, the water permeable surface layer and the water permeable upper surface layer are laid in sequence to obtain the environment-friendly full-transmission type colored pervious concrete; wherein, the upper surface layer of the permeable water is added with various pigments according to the actual engineering requirements.
(3) The mass fraction of the waste concrete recycled aggregate is 80-93%, the mass fraction of the degradable waste plastic particles is 5-15%, and the mass fraction of the waterworks sludge drying spherulites is 2-7%.
The 28d compressive strength of the upper permeable surface layer of the environment-friendly full-permeable color pervious concrete prepared by the method is not lower than 20MPa, and the water permeability is more than 1.5 mm/s; the compressive strength of the water permeable surface layer 28d is not lower than 26MPa, and the water permeability is greater than 2.0 mm/s; the unconfined compressive strength of the porous cement stabilizing layer 7d is more than 10MPa, and the water permeability is more than 5.0 mm/s.
The degradable waste plastic particles form a microbial degradation system in permeable concrete after being soaked in rainwater, and release natural pores continuously after being slowly degraded by microbes, so that the water permeability of the permeable concrete system is improved.
The water plant sludge drying spherulites are dried at high temperature to form a porous structure, an adsorption system is formed, certain nutrient elements in rainwater can be adsorbed, and water eutrophication is reduced.
The invention adopts cheap waste materials, and has the characteristics of simple preparation process, capability of adsorbing rich nutrient elements in rainwater, high strength, good water permeability, difficulty in blockage and the like.
This is further illustrated by the specific examples below.
Example 1:
the pervious concrete is divided into an upper surface layer and a lower surface layer and the porous cement stable layer which are respectively stirred and formed,
the concrete mixing proportion is that the mass ratio of ① waste concrete recycled aggregate to degradable waste plastic particles to water plant sludge drying spherical particles in the upper surface layer is 90:7:3, and 3 per mill of red iron oxide pigment is added, and the mass ratio of ② waste concrete recycled aggregate to degradable waste plastic particles to water plant sludge drying spherical particles in the lower surface layer is 93:5: 2;
③ the mass ratio of the waste concrete recycled aggregate, the degradable waste plastic particles and the waterworks sludge drying pellets in the porous cement stabilizing layer is 83:12: 5.
See table 1 below for specific performance conditions.
TABLE 1 pervious concrete System Performance
Example 2:
the permeable concrete is divided into an upper permeable surface layer, a lower permeable surface layer and a porous cement stabilizing layer which are respectively stirred and formed, and the specific mixing proportion is that ① mass ratio of waste concrete regeneration aggregate in the upper permeable surface layer to degradable waste plastic particles to water plant sludge drying spherical particles is 91:6:3, ② mass ratio of waste concrete regeneration aggregate in the lower permeable surface layer to degradable waste plastic particles to water plant sludge drying spherical particles is 95:3:2, and ③ mass ratio of waste concrete regeneration aggregate in the porous cement stabilizing layer to degradable waste plastic particles to water plant sludge drying spherical particles is 80:15: 5.
See table 2 below for specific performance conditions.
TABLE 2 pervious concrete System Performance
Claims (12)
1. The environment-friendly full-permeable pervious concrete based on the waste concrete is characterized by being prepared by the following steps:
(1) mixing and stirring 80-93% of waste concrete recycled aggregate, 5-15% of degradable waste plastic particles and 2-7% of water plant sludge drying spherical particles according to the mass percentage, and adding part of mixing water after uniform mixing until the surface of the aggregate is wet;
(2) sequentially adding a cementing material and a mixed solution of the rest of mixed water and an additive until the surface of the mixture is bright, and stopping stirring, wherein the mass ratio of the cementing material to the waste concrete recycled aggregate is 1: 3-1: 5;
(3) sequentially paving the porous cement stabilizing layer, the water permeable surface layer and the water permeable upper surface layer in sequence, and pressing to obtain the environment-friendly full-permeable pervious concrete;
the waste concrete recycled aggregate comprises recycled aggregate with particle gradation of at least three of 2.36-4.75 mm, 4.75-9.5 mm, 9.5-16.5 mm and 4.75-26.5 mm obtained after crushing and screening waste concrete; the porous cement stabilizing layer is of 4.75-26.5 mm gradation, the water permeable lower layer is of 4.75-9.5 mm gradation or 9.5-16.5 mm gradation, and the water permeable upper layer is of 2.36-4.75 mm gradation.
2. The environmentally friendly permeable concrete according to claim 1, further comprising a step of reinforcing the 4.75 mm-9.5 mm or 9.5 mm-16.5 mm grade with a reinforcing agent.
3. The environment-friendly full-permeable pervious concrete based on the waste concrete as claimed in claim 2, wherein the reinforcer is one of potassium methyl silicate or water glass, the mass concentration percentage is 3-45%, and the strengthening time is 3-8 min.
4. The environment-friendly full-permeability pervious concrete based on the waste concrete as claimed in claim 1, characterized in that the admixture is a high-efficiency water reducing agent, the high-efficiency water reducing agent is one of a high-efficiency polycarboxylic acid water reducing agent or a naphthalene water reducing agent, and the mass ratio of the high-efficiency polycarboxylic acid water reducing agent or the naphthalene water reducing agent is 0% -0.3% of the gelled material.
5. The environmentally-friendly permeable concrete based on waste concrete according to claim 1, wherein the whole stirring time in the steps (1) and (2) is not more than 3 min.
6. The environmentally friendly permeable concrete based on waste concrete according to claim 5, wherein the whole mixing time in steps (1) and (2) is 2 min.
7. The environmentally friendly permeable concrete based on waste concrete according to claim 1, wherein a colored pigment is added into the permeable upper layer.
8. The environmentally friendly permeable concrete based on waste concrete according to claim 7, wherein the color pigment is iron oxide powder.
9. The environmentally-friendly and fully-permeable pervious concrete based on waste concrete according to claim 1, wherein the cementing material is one or a mixture of cement, mineral powder and fly ash.
10. A preparation method of environment-friendly full-permeable pervious concrete based on waste concrete is characterized by comprising the following steps:
(1) mixing and stirring 80-93% of waste concrete recycled aggregate, 5-15% of degradable waste plastic particles and 2-7% of water plant sludge drying spherical particles according to the mass percentage, and adding part of mixing water after uniform mixing until the surface of the aggregate is wet;
(2) sequentially adding a gel material and a mixed solution of the residual mixed water and an additive until the surface of the mixture is bright, and stopping stirring, wherein the mass ratio of the gel material to the waste concrete recycled aggregate is 1: 3-1: 5;
(3) sequentially laying and pressing the porous cement stabilizing layer, the water permeable lower surface layer and the water permeable upper surface layer;
the waste concrete recycled aggregate comprises recycled aggregate with particle grading of at least three of 2.36-4.75 mm, 4.75-9.5 mm, 9.5-16.5 mm and 4.75-26.5 mm, which are obtained by crushing and screening waste concrete; the porous cement stabilizing layer is of 4.75-26.5 mm gradation, the water permeable lower layer is of 4.75-9.5 mm gradation or 9.5-16.5 mm gradation, and the water permeable upper layer is of 2.36-4.75 mm gradation.
11. The method of claim 10, further comprising the step of fortifying the 4.75mm to 9.5mm or 9.5mm to 16.5mm grade with a fortifier; the strengthening agent is one of methyl potassium silicate or water glass, the mass concentration percentage is 3% -45%, and the strengthening time is 3-8 min.
12. The preparation method according to claim 10, wherein the mass ratio of the additive is 0-0.3% of the cementing material.
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| CN108484216B (en) * | 2018-02-05 | 2021-04-06 | 上海良延环保科技发展有限公司 | Regenerated environment-friendly nutrient-rich water permeable brick |
| CN108285309A (en) * | 2018-03-06 | 2018-07-17 | 上海复培新材料技术有限公司 | A kind of pervious concrete and its preparation |
| CN108840712A (en) * | 2018-07-27 | 2018-11-20 | 同济大学 | One kind having the sponge concrete of " contain water-be retained-release water " function |
| CN108947401B (en) * | 2018-08-16 | 2021-06-11 | 中建西部建设西南有限公司 | Anti-blocking water-permeable concrete |
| CN111233401A (en) * | 2020-02-27 | 2020-06-05 | 广州市四通建材实业有限公司 | Colored pervious concrete and preparation method thereof |
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| CN105645855A (en) * | 2014-04-24 | 2016-06-08 | 宋金博 | Production process of recycled porous concrete produced with waste road concrete aggregate |
| CN104478361A (en) * | 2014-12-24 | 2015-04-01 | 扬州大学 | Permeable recycled aggregate and ceramsite concrete doped with industrial and agricultural solid waste and preparation |
| CN106167380A (en) * | 2016-06-27 | 2016-11-30 | 中国十七冶集团有限公司 | A kind of iron tailings anti-block water permeable concrete road surface and preparation method thereof |
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