CN110981364A - Pervious concrete material and preparation method thereof - Google Patents
Pervious concrete material and preparation method thereof Download PDFInfo
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- CN110981364A CN110981364A CN201911364135.5A CN201911364135A CN110981364A CN 110981364 A CN110981364 A CN 110981364A CN 201911364135 A CN201911364135 A CN 201911364135A CN 110981364 A CN110981364 A CN 110981364A
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- Prior art keywords
- pervious concrete
- construction waste
- concrete material
- steel slag
- side length
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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
-
- 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
- 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
-
- 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
- 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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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
A pervious concrete material and a preparation method and application thereof are disclosed, which comprises the following raw material components in parts by weight: 12-19 parts of ordinary portland cement, 20-64 parts of steel slag, 15-55 parts of construction waste and 1-10 parts of medium sand. According to the invention, the steel slag, the construction waste and the medium sand are mixed to form the novel concrete, so that the effects of recycling solid wastes and changing waste into valuable are achieved, the developed permeable concrete material has excellent performances in compaction degree, strength and water permeability, and a product with a higher added value is formed.
Description
Technical Field
The invention relates to the field of building materials, in particular to a pervious concrete material and a preparation method thereof.
Background
With the continuous development of urban modern construction, the concept of the sponge city is gradually accepted by most people, most of the soil of the city is covered by the traditional reinforced concrete, and the traditional concrete pavement has poor water permeability and air permeability. The permeable steel slag concrete has the characteristics of porous structure and high porosity, can permeate rainwater, increases urban underground water resources, improves urban climate and protects environment. The pervious concrete can be widely applied to road engineering, parking lots and the like in the fields of municipal administration, residential areas, gardens and squares.
The steel slag is a byproduct generated in the steel-making process, and the steel-making process and the steel slag treatment process are different in properties, wherein the electric furnace steel slag has good stability, so that the electric furnace steel slag is widely applied to building materials, and particularly widely applied to pervious concrete products. However, with the continuous development of the steel slag permeable concrete product market, the steel slag resource has a phenomenon of short supply and demand.
The construction industry in China is in the rapid development period, the resource promotion of construction waste is seriously delayed, and the current resource utilization rate is less than 5 percent and is far lower than developed countries and regions such as European Union (90 percent), Japan (97 percent) and Korea (97 percent). The production quantity of the construction waste is continuously increased and accounts for 30 to 40 percent of the urban waste, thereby causing serious ecological crisis. The construction waste resource utilization concerns the coordinated development of urban ecological environment, and the comprehensive utilization of the construction waste in China is urgent.
Disclosure of Invention
In view of the above-mentioned disadvantages of the prior art, it is an object of the present invention to provide a pervious concrete material and a method for preparing the same, which solve the problems of the prior art.
To achieve the above objects and other related objects, the present invention is achieved by the following technical solutions.
The invention provides a pervious concrete material which comprises the following raw material components in parts by weight:
according to the pervious concrete material, the raw material components also comprise mineral powder. The oreThe powder is used for replacing cement to reduce the production cost. The weight part of the mineral powder is 1-10 parts, preferably 3-7 parts. According to the pervious concrete material, the mineral powder is granulated blast furnace slag powder. The density of the mineral powder is not less than 2.8g/cm3Specific surface area of not less than 350m2In terms of/kg. Preferably, the 7d activity index of the ore powder is not less than 75%, and the 28d activity index of the ore powder is not less than 95%. Preferably, the content of sulfur trioxide in the mineral powder is not more than 4.0 wt%. The content of sulfur trioxide is carried out according to GB/T176, the density is carried out according to GB/T208, and the specific surface area is carried out according to GB/T8074.
The construction waste in the application comprises concrete, mortar, stones and tiles. Preferably, the content of the micro powder in the construction waste is less than 2.0 wt%, and the micro powder is particles with the particle size of less than 75 mu m in the construction waste. Preferably, the content of mud blocks in the construction waste is less than 0.7 wt%, and the mud blocks refer to particles with the original particle size of more than 4.75mm in the construction waste, and the particles are changed into particles with the particle size of less than 2.36mm after water washing and hand kneading. Preferably, the water absorption of the construction waste is less than 5.0 wt%, and the water absorption is the mass of water contained in the construction waste in a saturated dry-face state to the mass of the construction waste in a completely dry state.
More preferably, the content of sulfides and sulfates in the construction waste is < 2.0 wt.%, wherein the content of sulfides and sulfates is based on the mass of sulfur dioxide. Preferably, the content of chloride in the construction waste is less than 0.06 wt%, wherein the content of chloride is based on the mass of chloride ions. Preferably, the content of the sundries in the construction waste is less than 1.0 wt%, and the sundries are other substances except concrete, mortar, tiles and stones in the construction waste. Preferably, the construction waste has a crush index of less than 20%. Preferably, the apparent density of the construction waste is greater than 2350kg/m3. Preferably, the porosity of the construction waste is less than 50%. Preferably, the content of platelet-shaped particles in the construction waste is less than 10 wt%. Wherein the acicular flaky particles are acicular particles with the length 2.4 times larger than the average particle size of the grade to which the particles belong in the construction waste; the thickness of the particles is less than 0.4 times of the average particle diameter, which means the upper and lower limit particle diameters of the particle fractionAverage value.
According to the pervious concrete material, the single-particle grade of the construction waste is 5-10 mm. More preferably, the sieve holes of the square-hole sieve with the side length of 2.36mm are adopted, and the accumulated surplus screening rate of the construction waste is 95-100%; adopting square-hole sieve holes with side length of 4.75mm, wherein the accumulated surplus screening rate of the construction waste is 80-100%; and (3) adopting square-hole sieve holes with side length of 9.50mm, wherein the accumulated surplus screening rate of the construction waste is 0-15%.
In the technical scheme, the steel slag is used as the aggregate, the construction waste is used as the recycled aggregate, and a small amount of medium sand is matched to prepare the pervious concrete material. The steel slag has higher rigidity due to containing various metal element substances, the recycled aggregate of the construction waste has higher flexibility, namely deformability, the steel slag and the recycled aggregate are organically combined and mutually cooperated to generate a water permeable effect, and the construction waste with a proper particle size is used as the recycled aggregate, so that the abrasion energy generated during the stirring and compacting of the steel slag aggregate is reduced, a certain buffering effect is realized, and the water permeable concrete material still has good water permeability on the premise of certain compactness and certain strength.
According to the pervious concrete material, the raw material components further comprise water, and the addition amount of the water is 0.3-0.4 times of the amount of the common Portland cement.
According to the pervious concrete material, the ordinary portland cement is p.o42.5r.
According to the pervious concrete material, the steel slag has a continuous particle size fraction of 5-16 mm. More preferably, a square-hole sieve with the side length of 2.36mm is adopted, and the accumulated residue rate of the steel slag is 95-100%; adopting square-hole sieve meshes with side length of 4.75mm, wherein the accumulated screen residue rate of the steel slag is 85-100%; adopting square-hole sieve meshes with side length of 9.50mm, wherein the accumulated screen residue rate of the steel slag is 30-60%; adopting square-hole sieve pores with the side length of 16.0mm, wherein the accumulated surplus fraction of the steel slag is 0-10%; and (3) adopting square-hole sieve holes with the side length of 19.0mm, wherein the accumulated surplus rate of the steel slag is 0. Preferably, the water absorption of the steel slag is less than 3.0 wt.%. Preferably, the steel slag has an apparent density greater than2450kg/m3. Preferably, the steel slag has a porosity of less than 47%. The apparent density in this application is the mass per unit volume of the steel slag (including the inner closed voids).
In the pervious concrete material, the medium sand in the pervious concrete material is clastics with the particle size of 0.5-0.25 mm. Preferably, the content of the medium sand is 4-6 parts by weight.
The application also discloses a preparation method of the pervious concrete material, which comprises the following steps: mixing the raw material components to form a concrete mixture, and then placing the concrete mixture in a mould for forming.
The invention also discloses the application of the pervious concrete material as a water absorbing material.
The technical scheme of the application has the following technical effects:
according to the invention, the steel slag, the construction waste and the medium sand are mixed to form the novel concrete, so that the effects of recycling solid wastes and changing waste into valuable are achieved, the developed permeable concrete material has excellent performances in compaction degree, strength and water permeability, and a product with a higher added value is formed.
Detailed Description
The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will become apparent to those skilled in the art from the present disclosure.
Before the present embodiments are further described, it is to be understood that the scope of the invention is not limited to the particular embodiments described below; it is also to be understood that the terminology used in the examples is for the purpose of describing particular embodiments only, and is not intended to limit the scope of the present invention. Test methods in which specific conditions are not specified in the following examples are generally carried out under conventional conditions or under conditions recommended by the respective manufacturers.
When numerical ranges are given in the examples, it is understood that both endpoints of each of the numerical ranges and any value therebetween can be selected unless the invention otherwise indicated. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. In addition to the specific methods, devices, and materials used in the examples, any methods, devices, and materials similar or equivalent to those described in the examples may be used in the practice of the invention in addition to the specific methods, devices, and materials used in the examples, in keeping with the knowledge of one skilled in the art and with the description of the invention.
The contents and characteristics of the raw material components in examples 1 to 5 are shown in table 1 below.
Wherein the content of the first and second substances,
in the examples, the ore fines are granulated blast furnace slag powder. The density of the mineral powder is not less than 2.8g/cm3Specific surface area of not less than 350m2In terms of/kg. The 7d activity index of the mineral powder is not less than 75%, and the 28d activity index of the mineral powder is not less than 95%. The content of sulfur trioxide in the mineral powder is not more than 4.0 wt%. The content of sulfur trioxide is carried out according to GB/T176, the density is carried out according to GB/T208, and the specific surface area is carried out according to GB/T8074.
In embodiments, the construction waste comprises concrete, mortar, stone, tiles. The single-particle grade of the construction waste is 5-10 mm. More preferably, the sieve holes of the square-hole sieve with the side length of 2.36mm are adopted, and the accumulated surplus screening rate of the construction waste is 95-100%; adopting square-hole sieve holes with side length of 4.75mm, wherein the accumulated surplus screening rate of the construction waste is 80-100%; and (3) adopting square-hole sieve holes with side length of 9.50mm, wherein the accumulated surplus screening rate of the construction waste is 0-15%. The content of the micro powder in the construction waste is less than 2.0 wt%, and the micro powder is particles with the particle size of less than 75 mu m in the construction waste. The content of mud blocks in the construction waste is less than 0.7 wt%, and the mud blocks refer to particles with the original particle size of more than 4.75mm in the construction waste, and are changed into particles with the particle size of less than 2.36mm after water immersion and hand pinching. The water absorption of the construction waste is less than 5.0 wt%, and the water absorption is the mass percentage of water contained in the construction waste in a saturated dry-face state to the mass of the construction waste in an absolute dry state. The content of sulfide and sulfate in the construction waste is less than 2.0 wt%, wherein the content of sulfide and sulfate is calculated according to the mass of sulfur dioxide. The content of chloride in the construction waste is less than 0.06wt percent, wherein the content of chlorideIs based on the mass of chloride ions. The content of sundries in the construction waste is less than 1.0 wt%, and the sundries are other substances except concrete, mortar, tiles and stones in the construction waste. Preferably, the construction waste has a crush index of less than 20%. The apparent density of the construction waste is more than 2350kg/m3. The porosity of the construction waste is less than 50%. The content of the flaky particles in the construction waste is less than 10 wt%. Wherein the acicular flaky particles are acicular particles with the length 2.4 times larger than the average particle size of the grade to which the particles belong in the construction waste; the particles having a thickness of less than 0.4 times the average particle diameter are flaky particles, and the average particle diameter is the average value of the upper and lower limit particle diameters of the fraction.
In the examples, the ordinary portland cement is p.o42.5r.
In the embodiment, the continuous size fraction of the steel slag is 5-16 mm; adopting square-hole sieve holes with the side length of 2.36mm, wherein the accumulated surplus rate of the steel slag is 95-100%; adopting square-hole sieve meshes with side length of 4.75mm, wherein the accumulated screen residue rate of the steel slag is 85-100%; adopting square-hole sieve meshes with side length of 9.50mm, wherein the accumulated screen residue rate of the steel slag is 30-60%; adopting square-hole sieve pores with the side length of 16.0mm, wherein the accumulated surplus fraction of the steel slag is 0-10%; and (3) adopting square-hole sieve holes with the side length of 19.0mm, wherein the accumulated surplus rate of the steel slag is 0. The water absorption of the steel slag is less than 3.0 wt%. The apparent density of the steel slag is more than 2450kg/m3. The porosity of the steel slag is less than 47 percent. The apparent density in this application is the mass per unit volume of the steel slag (including the inner closed voids).
In the embodiment, the medium sand refers to crumbs with the particle size ranging from 0.5mm to 0.25 mm.
TABLE 1
The preparation method of the product in each example in table 1 is as follows: the application also discloses a preparation method of the pervious concrete material, which comprises the following steps: uniformly mixing the raw material components, specifically: mixing the steel slag, the construction waste, the ordinary portland cement and the medium sand, then adding water to mix to form a concrete mixture, and then placing the concrete mixture in a mould for forming.
The 3-day compression resistance, 7-day compression resistance and water permeability coefficients of the pervious concrete material products formed in the examples were tested by the following test methods:
the 3-day and 7-day compressive strength tests refer to GB/T50081-2002 Standard for mechanical property test methods of common concrete;
the test of the water permeability coefficient refers to GB/T25993-.
The effects of examples 1 to 6 are shown in table 2 below.
TABLE 2
| Numbering | 3d compression/MPa | 7d compression resistance/MPa | Coefficient of water permeability, cm/s,10-2 |
| Example 1 | 11.0 | 13.0 | 3.2 |
| Example 2 | 12.7 | 14.9 | 3.2 |
| Practice ofExample 3 | 11.2 | 13.8 | 3.1 |
| Example 4 | 10.7 | 12.2 | 3.0 |
| Example 5 | 8.5 | 9.8 | 3.2 |
| Example 6 | 9.2 | 10.1 | 3.1 |
As can be seen from the table above, the pervious concrete in the application has excellent performance in the aspects of compactness, strength and water permeability, and forms a product with higher added value. In addition, the mineral powder can be used for replacing part of cement without influencing the performance of the pervious concrete material, and the production cost of the pervious concrete material is further reduced.
The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (10)
1. The pervious concrete material is characterized by comprising the following raw material components in parts by weight:
2. the pervious concrete material of claim 1, wherein the raw material components further comprise water, and the addition amount of the water is 0.3-0.4 times of the amount of the ordinary portland cement.
3. The pervious concrete material of claim 1, wherein said Portland cement is P.O42.5R.
4. The pervious concrete material of claim 1, wherein the steel slag has a continuous particle size fraction of 5-16 mm.
5. The pervious concrete material of claim 1, wherein the construction waste has a single particle size of 5 to 10 mm.
6. The pervious concrete material of claim 1, characterized in that the cumulative percent screen of the construction waste is 95% -100% by adopting square-hole screen mesh with side length of 2.36 mm; adopting square-hole sieve holes with side length of 4.75mm, wherein the accumulated surplus screening rate of the construction waste is 80-100%; and (3) adopting square-hole sieve holes with side length of 9.50mm, wherein the accumulated surplus screening rate of the construction waste is 0-15%.
7. The pervious concrete material of claim 1, characterized in that a square-hole sieve with 2.36mm side length is adopted, and the cumulative screen residue rate of the steel slag is 95-100%; adopting square-hole sieve meshes with side length of 4.75mm, wherein the accumulated screen residue rate of the steel slag is 85-100%; adopting square-hole sieve meshes with side length of 9.50mm, wherein the accumulated screen residue rate of the steel slag is 30-60%; adopting square-hole sieve pores with the side length of 16.0mm, wherein the accumulated surplus fraction of the steel slag is 0-10%; and (3) adopting square-hole sieve holes with the side length of 19.0mm, wherein the accumulated surplus rate of the steel slag is 0.
8. The pervious concrete material of claim 1, wherein the raw material components further comprise 1-10 parts by weight of mineral powder.
9. A method of producing a pervious concrete material according to any of claims 1 to 8, comprising the steps of: mixing the raw material components to form a concrete mixture, and then placing the concrete mixture in a mould for forming.
10. Use of a pervious concrete material according to any of claims 1 to 8 as a water absorbing material.
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| CN201911364135.5A CN110981364A (en) | 2019-12-26 | 2019-12-26 | Pervious concrete material and preparation method thereof |
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| CN201911364135.5A CN110981364A (en) | 2019-12-26 | 2019-12-26 | Pervious concrete material and preparation method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112321247A (en) * | 2020-11-03 | 2021-02-05 | 中冶宝钢技术服务有限公司 | Pavement brick and preparation method thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101233748B1 (en) * | 2011-12-28 | 2013-02-18 | 김상민 | Environment-friendly road paving material, and paving method using the same |
| CN103626447A (en) * | 2013-12-02 | 2014-03-12 | 山东交通学院 | Ecological permeable pavement brick and preparation method thereof |
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- 2019-12-26 CN CN201911364135.5A patent/CN110981364A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101233748B1 (en) * | 2011-12-28 | 2013-02-18 | 김상민 | Environment-friendly road paving material, and paving method using the same |
| CN103626447A (en) * | 2013-12-02 | 2014-03-12 | 山东交通学院 | Ecological permeable pavement brick and preparation method thereof |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112321247A (en) * | 2020-11-03 | 2021-02-05 | 中冶宝钢技术服务有限公司 | Pavement brick and preparation method thereof |
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Application publication date: 20200410 |