CN113321445B - Pervious concrete and preparation method thereof - Google Patents
Pervious concrete and preparation method thereof Download PDFInfo
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- CN113321445B CN113321445B CN202110888953.6A CN202110888953A CN113321445B CN 113321445 B CN113321445 B CN 113321445B CN 202110888953 A CN202110888953 A CN 202110888953A CN 113321445 B CN113321445 B CN 113321445B
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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
- C04B26/00—Compositions of mortars, concrete or artificial stone, containing only organic binders, e.g. polymer or resin concrete
- C04B26/02—Macromolecular compounds
- C04B26/04—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
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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
- C04B38/00—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof
- C04B38/0038—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof by superficial sintering or bonding of particulate matter
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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
- 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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- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
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- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
- Road Paving Structures (AREA)
Abstract
The invention relates to the technical field of concrete, and provides pervious concrete and a preparation method thereof. The pervious concrete comprises 500-600 parts of coarse aggregate, 20-40 parts of fine aggregate, 20-30 parts of fly ash, 150-20 parts of cementing material, 10-20 parts of reinforcing agent, 10-20 parts of water reducing agent, 140-175 parts of water and 220-300 parts of modified activated carbon powder slurry. The pervious concrete provided by the invention has good water permeability, and can effectively prevent water accumulation on the road surface when being used for paving the road; meanwhile, the high-strength concrete has better compressive strength and rupture strength, and is suitable for paving a road surface with high strength performance requirements.
Description
Technical Field
The invention relates to the technical field of concrete, in particular to pervious concrete and a preparation method thereof.
Background
In urban construction, the paving of large-area waterproof and airtight traditional concrete water-blocking pavement materials has great pressure on virtuous circle of urban ecological environment. The traditional concrete paved road can cause water drainage in time in rainy days, so that water is accumulated on the road surface, the phenomena of vehicle drifting, muddy water splashing, night glare and the like are easily caused during driving in rainy days, and danger and inconvenience are brought to pedestrians and vehicles during driving. In addition, the road surface paved by the waterproof traditional concrete and surrounding urban buildings act together, so that the 'heat island effect' of the city can be increased, and the living comfort is seriously influenced. And because the 'heat island effect' of the city has great influence on the exchange of water vapor and heat of the city, the city building and the concrete pavement absorb great heat in the daytime, the specific heat is larger than that of soil, the temperature reduction is slow at night, the suburb temperature reduction is fast, so that the warm air flow in the city rises, the suburb cold air flow falls, the suburb circulation is formed typically, various pollutants in the air continuously circulate and drift over the city under the circulation action of the local air flow, great harm is caused to the ecological environment of the city and the healthy life of people, and various diseases are easily caused.
The pervious concrete is a novel environment-friendly and eco-friendly road material, can quickly eliminate water accumulation on roads and squares, reduces urban drainage burden, and improves the driving safety in rainy days and the travelling comfort of pedestrians in rainy days; rainwater can rapidly permeate into the ground, underground water is supplemented, soil humidity is kept, good water circulation is promoted, and ecological balance of the underground water and the soil is maintained; the heat absorption and storage functions are close to the ground covered by natural vegetation, the temperature and humidity of the urban space can be adjusted, and the urban heat island effect is relieved; has sound absorption effect and can reduce environmental noise. However, the existing pervious concrete products have the problem of contradiction between water permeability and material strength, and cannot meet the requirement of paving a pavement with high performance and excellent drainage, so that the popularization and the use of the pervious concrete products are influenced.
Disclosure of Invention
The invention aims to provide pervious concrete and a preparation method thereof, and aims to solve the technical problem that the pervious concrete product in the prior art cannot give consideration to both water permeability and material strength.
In order to achieve the purpose, the invention adopts the technical scheme that:
on one hand, the invention provides pervious concrete which comprises the following components in parts by mass:
500-600 coarse aggregate
20-40 parts of fine aggregate
20-30 parts of fly ash
Cementing material 150-
10-20 parts of reinforcing agent
10-20 parts of water reducing agent
Water 140-
Modified activated carbon powder slurry 220-300;
the preparation method of the modified activated carbon powder slurry comprises the following steps:
fully mixing activated carbon powder with 30-40w% of polyvinyl alcohol aqueous solution, adding fibers and water, and fully mixing to obtain modified activated carbon powder slurry; wherein the mass ratio of the activated carbon powder, the fiber, the water and the 30-40w% polyvinyl alcohol aqueous solution is 20: 20; 15-20: 1-3.
According to the permeable concrete, the modified activated carbon powder slurry is added, so that after the modified activated carbon powder slurry is mixed with other raw materials through the viscosity of a polyvinyl alcohol aqueous solution, activated carbon powder, fibers and polyvinyl alcohol can form a plurality of tiny aggregates with pores in the concrete, and the permeability of the concrete is improved; on the other hand, the fiber in the modified activated carbon powder slurry can play a role of a local micro-skeleton in concrete, and the polyvinyl alcohol is beneficial to improving the adhesive force between the activated carbon powder and other components in pervious concrete, so that the strength performance of the concrete can be effectively improved.
In the present invention, the coarse aggregate is generally selected from continuous crushed stones having a particle size of 5 to 30 mm.
The fine aggregate is continuous river sand with particle size of 0.3-0.5 mm.
The fly ash can be II-class fly ash. Preferably, the fly ash is class F class ii fly ash.
In the preparation method of the modified activated carbon powder slurry, an intensive mixer is adopted for mixing. The mixing speed of the activated carbon powder and the polyvinyl alcohol aqueous solution is 1500-2000rpm, and the mixing time is 90-120s, so that the polyvinyl alcohol aqueous solution is uniformly coated on the surface of the activated carbon powder, and the activated carbon powder is fully dispersed; the mixing speed of the added fiber and water is 900-1200rpm, the mixing time is 30-60s, so that the activated carbon powder coated by the polyvinyl alcohol aqueous solution is uniformly mixed with the fiber, the adhesion between the activated carbon powder and the fiber is generated by the viscosity of the polyvinyl alcohol aqueous solution, and the pores are generated in the micro-aggregates formed in the concrete by the modified activated carbon powder slurry.
Further, the fibers include alginate fibers and melamine fibers.
The alginate fibers have good water permeability, the melamine fibers have good strength performance, the alginate fibers can be reinforced, and the two fibers are used together, so that the water permeability and the strength of concrete can be improved simultaneously.
Further, the mass ratio of the alginate fibers to the melamine fibers is 2-5: 1.
furthermore, the length of the alginate fiber is 5-8mm, and the length of the melamine fiber is 20-40 mm.
In the invention, the length of the melamine fiber is too short, which is not beneficial to improving the strength performance of the concrete; the melamine fiber is too long, and can easily intertwine with each other, so that the melamine fiber is not beneficial to uniform dispersion and is also not beneficial to improving the strength of concrete.
In the invention, the seaweed fiber with relatively short length and the melamine fiber with relatively long length are combined, which is more beneficial to improving the water permeability of concrete.
Further, the cementing material is an aqueous acrylic resin solution.
Further, the aqueous acrylic resin solution is prepared from an aqueous acrylic resin and water according to the weight ratio of 1: 1-2 in mass ratio.
Further, the number average molecular weight of the water-based acrylic resin is 30000-50000.
In the pervious concrete provided by the invention, the added waterborne acrylic resin has too small molecular weight, which can affect the strength performance of the concrete; the molecular weight of the water-based acrylic resin is too large, which brings difficulty to the preparation process, influences the mixing uniformity of the components, and finally influences the strength performance of the concrete.
Further, the water reducing agent is a polyhydroxy acid water reducing agent.
Further, the reinforcing agent is at least one of calcium carbonate, potassium carbonate and calcium hydroxide.
On the other hand, the invention also provides a preparation method of the pervious concrete, which comprises the following steps:
uniformly mixing coarse aggregate, fine aggregate, fly ash and 60-80% of formula amount of water to obtain first mixed slurry;
uniformly mixing the cementing material, the reinforcing agent, the water reducing agent and the balance of water to obtain second mixed slurry;
and uniformly mixing the first mixed slurry, the second mixed slurry and the modified activated carbon powder slurry to obtain the pervious concrete.
In the above preparation method, the stirring speed of the mixing in each step is generally 100-150rpm, and the stirring time is generally 2-20 min.
The invention has the beneficial effects that:
the pervious concrete provided by the invention has good water permeability, and can effectively prevent water accumulation on the road surface when being used for paving the road; meanwhile, the high-strength concrete has better compressive strength and rupture strength, and is suitable for paving a road surface with high strength performance requirements.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more apparent, the present invention is further described in detail below with reference to specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present patent and do not limit the scope of the invention in any way.
The invention provides pervious concrete which comprises the following components in parts by weight:
500-600 coarse aggregate
20-40 parts of fine aggregate
20-30 parts of fly ash
Cementing material 150-
10-20 parts of reinforcing agent
10-20 parts of water reducing agent
Water 140-
Modified activated carbon powder slurry 220-300;
the preparation method of the modified activated carbon powder slurry comprises the following steps:
fully mixing activated carbon powder with 30-40w% of polyvinyl alcohol aqueous solution, adding fibers and water, and fully mixing to obtain modified activated carbon powder slurry; wherein the mass ratio of the activated carbon powder, the fiber, the water and the 30-40w% polyvinyl alcohol aqueous solution is 20: 20; 15-20: 1-3.
Wherein the fiber comprises alginate fiber and melamine fiber. The mass ratio of the alginate fibers to the melamine fibers is 2-5: 1. the length of the alginate fiber is 5-8mm, and the length of the melamine fiber is 20-40 mm.
The cementing material is aqueous acrylic resin solution. The aqueous acrylic resin solution is prepared from aqueous acrylic resin and water according to the weight ratio of 1: 1-2 in mass ratio. The number average molecular weight of the water-based acrylic resin is 30000-50000.
The water reducing agent is a polyhydroxy acid water reducing agent.
The reinforcing agent is at least one of calcium carbonate, potassium carbonate and calcium hydroxide.
The preparation method of the pervious concrete comprises the following steps:
uniformly mixing coarse aggregate, fine aggregate, fly ash and 60-80% of formula amount of water to obtain first mixed slurry;
uniformly mixing the cementing material, the reinforcing agent, the water reducing agent and the balance of water to obtain second mixed slurry;
and uniformly mixing the first mixed slurry, the second mixed slurry and the modified activated carbon powder slurry to obtain the pervious concrete.
For example: the pervious concrete is prepared according to the following method:
uniformly mixing 520g of coarse aggregate, 35g of fine aggregate, 22g of fly ash and 90g of water to obtain first mixed slurry; uniformly mixing 190g of 40w% aqueous acrylic resin solution (the number average molecular weight of the aqueous acrylic resin is 30000), 18g of potassium carbonate, 10g of polycarboxylic acid water reducing agent and 60g of water to obtain a second mixed slurry; uniformly mixing the first mixed slurry, the second mixed slurry and 280g of modified activated carbon powder slurry to obtain pervious concrete;
the modified activated carbon powder slurry is prepared by the following method:
fully mixing 500g of activated carbon powder with 50g of 30w% polyvinyl alcohol aqueous solution, adding 400g of alginate fibers, 100g of melamine fibers and 450g of water, and fully mixing to obtain modified activated carbon powder slurry; the length of the alginate fiber is 5mm, and the length of the melamine fiber is 25 mm.
The invention is described in more detail by referring to a part of the tests, which are carried out in sequence, and the following detailed description is given by combining specific examples:
unless defined otherwise, technical terms used in the following examples have the same meanings as commonly understood by one of ordinary skill in the art to which the present invention belongs. The reagents used in the following examples, unless otherwise specified, are all conventional biochemical reagents; the raw materials, instruments, equipment and the like used in the following examples are either commercially available or available by existing methods; the dosage of the reagent is the dosage of the reagent in the conventional experiment operation if no special description exists; the experimental methods are conventional methods unless otherwise specified.
Example 1
The pervious concrete comprises the following components in parts by mass:
coarse aggregate 500g
Fine aggregate 30g
Fly ash 25g
Aqueous acrylic resin solution (200 g)
Calcium carbonate 15g
15g of polycarboxylic acid water reducing agent (ADVA-109)
150g of water
260g of modified activated carbon powder slurry;
wherein the aqueous acrylic resin solution is prepared from aqueous acrylic resin with the number average molecular weight of 40000 and water according to the weight ratio of 1: 1.5 in mass ratio;
the modified activated carbon powder slurry is prepared by the following method:
adding 200g of activated carbon powder and 20g of polyvinyl alcohol aqueous solution (38 w%) into a powerful mixer, and mixing at the stirring speed of 1800rpm for 120 s; adding 150g of alginate fibers, 50g of melamine fibers and 200g of water, and then continuously stirring at the stirring speed of 1000rpm for 40s to obtain modified activated carbon powder slurry; wherein the length of the alginate fiber is 6mm, and the length of the melamine fiber is 30 mm;
the preparation method of the pervious concrete comprises the following steps:
(1) mixing the coarse aggregate, the fine aggregate, the fly ash and 100g of water, and then stirring at the stirring speed of 120rpm for 10min to obtain first mixed slurry;
(2) mixing the aqueous acrylic resin solution, calcium carbonate, a poly hydroxy acid water reducing agent (ADVA-109) and 50g of water, and stirring at the stirring speed of 120rpm for 10min to obtain a second mixed slurry;
(3) and mixing the first mixed slurry, the second mixed slurry and the modified activated carbon powder slurry, and stirring at the stirring speed of 120rpm for 5min to obtain the pervious concrete.
Example 2
The pervious concrete comprises the following components in parts by mass:
coarse aggregate 550g
20g of fine aggregate
20g of fly ash
Aqueous acrylic resin solution 150g
Potassium carbonate 10g
10g of polycarboxylic acid water reducing agent (ADVA-109)
140g of water
220g of modified activated carbon powder slurry;
wherein the aqueous acrylic resin solution is prepared from aqueous acrylic resin with the number average molecular weight of 30000 and water according to the weight ratio of 1: 1 in a mass ratio;
the modified activated carbon powder slurry is prepared by the following method:
adding 200g of activated carbon powder and 10g of polyvinyl alcohol aqueous solution (30 w%) into a powerful mixer, and mixing at the stirring speed of 1500rpm for 90 s; adding 135g of alginate fibers, 65g of melamine fibers and 150g of water, and then continuously stirring at the stirring speed of 900rpm for 30s to obtain modified activated carbon powder slurry; wherein the length of the alginate fiber is 5mm, and the length of the melamine fiber is 20 mm;
the preparation method of the pervious concrete comprises the following steps:
(1) mixing the coarse aggregate, the fine aggregate, the fly ash and 85g of water, and then stirring at the stirring speed of 100rpm for 8min to obtain first mixed slurry;
(2) mixing the aqueous acrylic resin solution, potassium carbonate, a poly hydroxy acid water reducing agent (ADVA-109) and 55g of water, and stirring at the stirring speed of 100rpm for 5min to obtain a second mixed slurry;
(3) and mixing the first mixed slurry, the second mixed slurry and the modified activated carbon powder slurry, and stirring at the stirring speed of 100rpm for 5min to obtain the pervious concrete.
Example 3
The pervious concrete comprises the following components in parts by mass:
coarse aggregate 600g
Fine aggregate 40g
30g of fly ash
170g of aqueous acrylic resin solution
20g of calcium hydroxide
20g of polycarboxylic acid water reducing agent (ADVA-109)
175g of water
300g of modified activated carbon powder slurry;
wherein the aqueous acrylic resin solution is prepared from aqueous acrylic resin with the number average molecular weight of 50000 and water according to the weight ratio of 1: 2 in a mass ratio;
the modified activated carbon powder slurry is prepared by the following method:
adding 200g of activated carbon powder and 30g of polyvinyl alcohol aqueous solution (40 w%) into a powerful mixer, and mixing at the stirring speed of 2000rpm for 110 s; adding 165g of alginate fibers, 35g of melamine fibers and 180g of water, and then continuously stirring at the stirring speed of 1200rpm for 60s to obtain modified activated carbon powder slurry; wherein the length of the alginate fiber is 8mm, and the length of the melamine fiber is 40 mm;
the preparation method of the pervious concrete comprises the following steps:
(1) mixing the coarse aggregate, the fine aggregate, the fly ash and 140g of water, and then stirring at the stirring speed of 150rpm for 20min to obtain a first mixed slurry;
(2) mixing the aqueous acrylic resin solution, calcium hydroxide, a poly hydroxy acid water reducing agent (ADVA-109) and 35g of water, and stirring at the stirring speed of 150rpm for 12min to obtain a second mixed slurry;
(3) and mixing the first mixed slurry, the second mixed slurry and the modified activated carbon powder slurry, and stirring at the stirring speed of 150rpm for 7min to obtain the pervious concrete.
Example 4
A pervious concrete, differing from example 1: in the preparation process of the modified activated carbon powder slurry, 200g of alginate fibers are added, and melamine fibers are not added.
Example 5
A pervious concrete, differing from example 1: in the preparation process of the modified activated carbon powder slurry, 200g of melamine fiber is added, and no alginate fiber is added.
Example 6
A pervious concrete, differing from example 1: in the preparation process of the modified activated carbon powder slurry, 130g of alginate fibers and 70g of melamine fibers are added.
Example 7
A pervious concrete, differing from example 1: in the preparation process of the modified activated carbon powder slurry, 170g of alginate fibers and 30g of melamine fibers are added.
Example 8
A pervious concrete, differing from example 1: in the preparation process of the modified activated carbon powder slurry, 150g of the added seaweed fiber and 50g of the added melamine fiber were replaced by 200g of carbon fiber with a length of 30 mm.
Example 9
A pervious concrete, differing from example 1: the length of the alginate fiber is 15 mm.
Example 10
A pervious concrete, differing from example 1: the length of the melamine fiber is 15mm
Example 11
A pervious concrete, differing from example 1: 170g of the aqueous acrylic resin solution were replaced by 140g of aqueous epoxy resin (AB-EP-44) and 60g of aqueous epoxy resin curing agent (AB-HGA).
Example 12
A pervious concrete, differing from example 1: the number average molecular weight of the aqueous acrylic resin is 20000.
Example 13
A pervious concrete, differing from example 1: the number average molecular weight of the aqueous acrylic resin was 60000.
Comparative example 1
The pervious concrete comprises the following components in parts by mass:
coarse aggregate 500g
Fine aggregate 30g
Fly ash 25g
Aqueous acrylic resin solution (200 g)
Calcium carbonate 15g
15g of polycarboxylic acid water reducing agent (ADVA-109)
230g of water
90g of activated carbon powder
60g alginate fibre
30g of melamine fibers;
wherein the length of the alginate fiber is 6mm, and the length of the melamine fiber is 30 mm;
the preparation method of the pervious concrete comprises the following steps:
(1) mixing and stirring coarse aggregate, fine aggregate, fly ash, activated carbon powder, alginate fiber, melamine fiber and 180g of water, wherein the stirring speed is 120rpm, and the stirring time is 10min, so as to obtain first mixed slurry;
(2) mixing the aqueous acrylic resin solution, calcium carbonate, a poly hydroxy acid water reducing agent (ADVA-109) and 50g of water, and stirring at the stirring speed of 120rpm for 10min to obtain a second mixed slurry;
(3) and mixing the first mixed slurry and the second mixed slurry, and stirring at the speed of 120rpm for 5min to obtain the pervious concrete.
Evaluation of test Effect
The pervious concretes of examples 1-13 and comparative example 1 were tested for water permeability and strength properties, and the test results are shown in table 1.
Wherein: and the water permeability coefficient is detected according to technical regulation CJJ/T135-2009 of the water permeable cement concrete pavement.
The compressive strength and the flexural strength are detected according to the standard GB/T50081-2002 for the mechanical property test method of common concrete, and the curing age is 28 days.
TABLE 1 pervious concrete Performance test results
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (6)
1. The pervious concrete is characterized by comprising the following components in parts by mass:
500-600 coarse aggregate
20-40 parts of fine aggregate
20-30 parts of fly ash
Cementing material 150-
10-20 parts of reinforcing agent
10-20 parts of water reducing agent
Water 140-
Modified activated carbon powder slurry 220-300;
the cementing material is a water-based acrylic resin solution;
the preparation method of the modified activated carbon powder slurry comprises the following steps:
fully mixing activated carbon powder with 30-40w% of polyvinyl alcohol aqueous solution, adding fibers and water, and fully mixing to obtain modified activated carbon powder slurry; wherein the mass ratio of the activated carbon powder, the fiber, the water and the 30-40w% polyvinyl alcohol aqueous solution is 20: 20: 15-20: 1-3;
the fibers comprise alginate fibers and melamine fibers;
the mass ratio of the alginate fibers to the melamine fibers is 2-5: 1;
the length of the alginate fiber is 5-8mm, and the length of the melamine fiber is 20-40 mm.
2. The pervious concrete of claim 1, wherein said aqueous acrylic resin solution is prepared from an aqueous acrylic resin and water in a ratio of 1: 1-2 in mass ratio.
3. The pervious concrete of claim 2, characterized in that the number average molecular weight of the aqueous acrylic resin is 30000-50000.
4. The pervious concrete of claim 1, characterized in that said water reducing agent is a polycarboxylic acid water reducing agent.
5. The pervious concrete of claim 1, wherein the reinforcing agent is at least one of calcium carbonate, potassium carbonate, and calcium hydroxide.
6. A method of producing the pervious concrete according to any one of claims 1 to 5, comprising:
uniformly mixing coarse aggregate, fine aggregate, fly ash and 60-80% of formula amount of water to obtain first mixed slurry;
uniformly mixing the cementing material, the reinforcing agent, the water reducing agent and the balance of water to obtain second mixed slurry;
and uniformly mixing the first mixed slurry, the second mixed slurry and the modified activated carbon powder slurry to obtain the pervious concrete.
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| US9328027B2 (en) * | 2012-12-21 | 2016-05-03 | Hanson Aggregates LLC | Fast-curing pervious concrete mix |
| CN110590216A (en) * | 2019-08-28 | 2019-12-20 | 中交第一公路勘察设计研究院有限公司 | Permeable concrete liquid reinforcing agent and preparation method and use method thereof |
| CN112321264B (en) * | 2020-10-21 | 2022-07-15 | 江苏新路德建设有限公司 | Pervious concrete and preparation method and application thereof |
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Effective date of registration: 20211019 Address after: 250000 north of Wangfu village, Huaiyin District, Jinan City, Shandong Province Applicant after: Shandong Litai Concrete Co.,Ltd. Address before: 100089 No.048, g / F, block a, Zhizao street, Zhongguancun, 45 Chengfu Road, Haidian District, Beijing Applicant before: Beijing baiotake Technology Co.,Ltd. Applicant before: Shandong Litai Concrete Co.,Ltd. |
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