CN113929396A - Environment-friendly recycled concrete brick - Google Patents
Environment-friendly recycled concrete brick Download PDFInfo
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- CN113929396A CN113929396A CN202111291929.0A CN202111291929A CN113929396A CN 113929396 A CN113929396 A CN 113929396A CN 202111291929 A CN202111291929 A CN 202111291929A CN 113929396 A CN113929396 A CN 113929396A
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
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- 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
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
- C04B40/0039—Premixtures of ingredients
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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
- C04B2111/00017—Aspects relating to the protection of the environment
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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
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/10—Mortars, concrete or artificial stone characterised by specific physical values for the viscosity
-
- 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)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Preparation Of Clay, And Manufacture Of Mixtures Containing Clay Or Cement (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses an environment-friendly recycled concrete brick, and relates to the technical field of building materials. The concrete brick comprises the following raw materials in parts by weight: cement: 90-120 parts of water: 60-80 parts of waste concrete blocks: 30-40 parts of calcium hydroxide: 15-20 parts of reinforcing agent: 5-15 parts of polycarboxylic acid water reducing agent: 5-10 parts of dispersant: 3-8 parts; the preparation method comprises the following steps: (1) raw material treatment: transferring the raw materials into an outdoor concrete stirring tank, and fully and uniformly stirring to obtain a mortar mixture; (2) making green bricks: transferring the obtained mortar mixture into a brick making mold, and pressing to obtain a green brick; (3) drying and forming treatment: transferring the obtained green bricks into a drying box, drying, and removing brick making molds to obtain bricks; (4) and (3) maintenance treatment: and transferring the obtained bricks into a curing chamber for curing. The prepared concrete brick has excellent overall performance and realizes the function of recycling.
Description
Technical Field
The invention relates to the technical field of building materials, in particular to an environment-friendly recycled concrete brick.
Background
In recent years, the construction industry has entered a high-speed development stage. The occupation of natural resources and the negative impact on the environment caused by concrete as the largest man-made material also lead to the discussion of sustainable development problems. The amount of waste concrete removed annually in the world, waste concrete from new buildings, and waste concrete discharged from concrete plants, prefabrication plants, etc. is enormous. Meanwhile, the discharge amount of the waste concrete is expected to increase along with the acceleration of the urbanization process worldwide, and the removal and the modification of the original building are increased day by day. At present, the treatment method of the waste concrete is mainly to transport the waste concrete to suburbs for stacking or landfill. Although the scheme of recycling the waste concrete is also available, the overall performance of the prepared new concrete brick is poor.
For example, the prior art, as in application No.: CN202010645276.0, publication No.: CN111825379A, discloses a preparation process of environment-friendly recycled concrete, and the technical scheme is as follows: :
s1, crushing waste concrete by using a concrete crusher to obtain recycled aggregate;
s2, placing 10000g of recycled aggregate into 25000g of water, adding 300g of citric acid and 1000g of propylene glycol propyl ether into the water, ultrasonically vibrating for 1h, and filtering to obtain treated recycled aggregate;
s3, immersing 20g of polypropylene fiber and 20g of polyacrylonitrile fiber in 200mL of 10% potassium hydroxide solution with mass fraction for 0.5h, taking out the polypropylene fiber and the polyacrylonitrile fiber, washing with deionized water, drying, immersing the polypropylene fiber and the polyacrylonitrile fiber in 200mL of ethanol, adding 6g of aminopropyl trimethoxysilane into the ethanol, immersing and ultrasonically vibrating for 2h, taking out, and drying to obtain a modified fiber mixture;
and S4, adding 9500g of treated recycled aggregate, 6800g of yellow sand, 24g of the modified fiber mixture and 600g of fly ash into a concrete mixer for primary stirring for 2min, then adding 2400g of cement for secondary stirring for 1min, then adding 2200g of water and 60g of water reducer for tertiary stirring, and stirring for 2min to obtain the environment-friendly recycled concrete.
However, the above prior art has the following problems: only the waste concrete is used, the actual effect is poor, and the waste concrete is a formed solid block-shaped substance, so that the stability of the whole concrete is difficult to maintain; meanwhile, the prepared modified fiber mixture has a general effect, and cannot be better improved after being mixed with yellow sand; in addition, the addition of the fly ash is easy to activate hydration reaction, and is not beneficial to increasing the later strength of concrete.
Disclosure of Invention
The invention aims to provide an environment-friendly recycled concrete brick which has excellent overall performance, can be recycled, has low toxicity of raw materials in components, has little influence on the ecological environment, and has the performances of slump, expansion degree, inverted slump cylinder emptying time, mortar viscosity, compressive strength and the like which accord with expectations.
In order to realize the purpose, the invention provides an environment-friendly recycled concrete brick, which comprises the following raw materials in parts by weight:
cement: 90 to 120 portions of the mixture of the components,
water: 60 to 80 portions of the raw materials are mixed,
waste concrete blocks: 30 to 40 portions of the raw materials are mixed,
calcium hydroxide: 15 to 20 portions of the raw materials are mixed,
reinforcing agent: 5 to 15 portions of the raw materials are mixed,
polycarboxylic acid water reducing agent: 5 to 10 portions of the raw materials are mixed,
dispersing agent: 3-8 parts.
In the above-described environment-friendly recycled concrete block,
the composite material comprises the following raw materials in parts by weight:
cement: 95 to 110 portions of the mixture of the components,
water: 65 to 75 portions of the weight percentage of the mixture,
waste concrete blocks: 32 to 36 portions of the raw materials are mixed,
calcium hydroxide: 15 to 20 portions of the raw materials are mixed,
reinforcing agent: 8 to 12 portions of the raw materials are mixed,
polycarboxylic acid water reducing agent: 6 to 9 portions of the raw materials are mixed,
dispersing agent: 3-8 parts.
In the above-described environment-friendly recycled concrete block,
the composite material comprises the following raw materials in parts by weight:
cement: 105 parts of (a) to (b),
water: 70 parts of (a) to (b),
waste concrete blocks: 34 parts of (a) to (b),
calcium hydroxide: 18 parts of (a) to (b),
reinforcing agent: 10 parts of (a) to (b),
polycarboxylic acid water reducing agent: 8 parts of (a) a mixture of (b),
dispersing agent: 5 parts of the raw materials.
In the above-described environment-friendly recycled concrete block,
the reinforcing agent comprises polyoxyethylene, polyurethane and vinyl silane, wherein the mass ratio of the polyoxyethylene to the polyurethane to the vinyl silane is 1:2: 1.
in the above-described environment-friendly recycled concrete block,
the cement is P.O 42.5.5R portland cement;
the average grain diameter of the waste concrete blocks is 3 mm;
the average grain diameter of the calcium hydroxide is 1 mm;
the polycarboxylic acid water reducing agent is 412, and is purchased from Shenyang Xingzheng and chemical engineering Limited company;
the dispersant is WHDF-S, which is purchased from Shandong seven-wood Tianyi New Material Co.
In the environment-friendly recycled concrete brick, the preparation method of the environment-friendly recycled concrete brick comprises the following steps:
(1) raw material treatment: transferring the cement, water, the waste concrete blocks, calcium hydroxide, a reinforcing agent, a polycarboxylic acid water reducing agent and a dispersing agent to an outdoor concrete stirring tank, and fully and uniformly stirring to obtain a mortar mixture;
(2) making green bricks: transferring the mortar mixture obtained in the step (1) into a brick making mold, and pressing to obtain a green brick;
(3) drying and forming treatment: transferring the green bricks obtained in the step (2) to a drying box, drying, and removing brick making molds to obtain bricks;
(4) and (3) maintenance treatment: and (4) transferring the bricks obtained in the step (3) into a curing chamber for curing.
In the above-described environment-friendly recycled concrete block,
and (2) controlling the temperature in the concrete mixing tank in the step (1) within 60 ℃.
In the above-described environment-friendly recycled concrete block,
the pressure of the pressing in the step (2) is 6.5 MPa.
In the above-described environment-friendly recycled concrete block,
the temperature for drying in step (3) was 150 ℃.
In the above-described environment-friendly recycled concrete block,
the temperature in the curing chamber in the step (4) is 20 ℃;
the humidity in the curing room in the step (4) is 75 percent;
the period in the curing chamber in the step (4) is 72 hours.
The environment-friendly recycled concrete brick provided by the technical scheme has the following beneficial effects:
(1) the prepared environment-friendly recycled concrete brick has excellent overall performance, fully utilizes the waste concrete blocks, adopts various low-toxicity substances, and realizes the recycling of concrete and environment-friendly ecological application;
(2) the prepared environment-friendly recycled concrete brick is innovatively introduced with a reinforcing agent, wherein the reinforcing agent comprises polyethylene oxide, polyurethane and vinyl silane, the relative dosage ratio of the polyethylene oxide, the polyurethane and the vinyl silane is controlled, and a comparison test shows that the reinforcing agent can improve the mechanical property of concrete.
Detailed Description
The following examples are given to further illustrate the embodiments of the present invention. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
It should be noted that the waste concrete blocks according to the present invention are waste products from concrete prepared from P.O 42.5.5R portland cement, and need to be pre-crushed, and the average particle size after crushing is 3 mm.
Example 1
The environment-friendly recycled concrete brick comprises the following raw materials in parts by weight:
cement: 90 parts of (a) a mixture of (b),
water: 80 parts of (a) a water-soluble polymer,
waste concrete blocks: 30 parts of (a) to (b),
calcium hydroxide: 20 parts of (by weight), and mixing the components,
reinforcing agent: 5 parts of (a) a mixture of (b),
polycarboxylic acid water reducing agent: 10 parts of (a) to (b),
dispersing agent: and 3 parts.
In the above-described environment-friendly recycled concrete block,
the reinforcing agent comprises polyoxyethylene, polyurethane and vinyl silane, wherein the mass ratio of the polyoxyethylene to the polyurethane to the vinyl silane is 1:2: 1.
in the above-described environment-friendly recycled concrete block,
the cement is P.O 42.5.5R portland cement;
the average grain diameter of the waste concrete blocks is 3 mm;
the average grain diameter of the calcium hydroxide is 1 mm;
the polycarboxylic acid water reducing agent is 412, and is purchased from Shenyang Xingzheng and chemical engineering Limited company;
the dispersant is WHDF-S, which is purchased from Shandong seven-wood Tianyi New Material Co.
In the environment-friendly recycled concrete brick, the preparation method of the environment-friendly recycled concrete brick comprises the following steps:
(1) raw material treatment: transferring the cement, water, the waste concrete blocks, calcium hydroxide, a reinforcing agent, a polycarboxylic acid water reducing agent and a dispersing agent to an outdoor concrete stirring tank, and fully and uniformly stirring to obtain a mortar mixture;
(2) making green bricks: transferring the mortar mixture obtained in the step (1) into a brick making mold, and pressing to obtain a green brick;
(3) drying and forming treatment: transferring the green bricks obtained in the step (2) to a drying box, drying, and removing brick making molds to obtain bricks;
(4) and (3) maintenance treatment: and (4) transferring the bricks obtained in the step (3) into a curing chamber for curing.
In the above-described environment-friendly recycled concrete block,
and (2) controlling the temperature in the concrete mixing tank in the step (1) within 60 ℃.
In the above-described environment-friendly recycled concrete block,
the pressure of the pressing in the step (2) is 6.5 MPa.
In the above-described environment-friendly recycled concrete block,
the temperature for drying in step (3) was 150 ℃.
In the above-described environment-friendly recycled concrete block,
the temperature in the curing chamber in the step (4) is 20 ℃;
the humidity in the curing room in the step (4) is 75 percent;
the period in the curing chamber in the step (4) is 72 hours.
Example 2
The environment-friendly recycled concrete brick comprises the following raw materials in parts by weight:
cement: 120 parts of (a) to (b),
water: 60 parts of (a) to (b),
waste concrete blocks: 40 parts of (a) to (b),
calcium hydroxide: 15 parts of (a) to (b),
reinforcing agent: 15 parts of (a) to (b),
polycarboxylic acid water reducing agent: 5 parts of (a) a mixture of (b),
dispersing agent: 8 parts.
In the above-described environment-friendly recycled concrete block,
the reinforcing agent comprises polyoxyethylene, polyurethane and vinyl silane, wherein the mass ratio of the polyoxyethylene to the polyurethane to the vinyl silane is 1:2: 1.
in the above-described environment-friendly recycled concrete block,
the cement is P.O 42.5.5R portland cement;
the average grain diameter of the waste concrete blocks is 3 mm;
the average grain diameter of the calcium hydroxide is 1 mm;
the polycarboxylic acid water reducing agent is 412, and is purchased from Shenyang Xingzheng and chemical engineering Limited company;
the dispersant is WHDF-S, which is purchased from Shandong seven-wood Tianyi New Material Co.
In the environment-friendly recycled concrete brick, the preparation method of the environment-friendly recycled concrete brick comprises the following steps:
(1) raw material treatment: transferring the cement, water, the waste concrete blocks, calcium hydroxide, a reinforcing agent, a polycarboxylic acid water reducing agent and a dispersing agent to an outdoor concrete stirring tank, and fully and uniformly stirring to obtain a mortar mixture;
(2) making green bricks: transferring the mortar mixture obtained in the step (1) into a brick making mold, and pressing to obtain a green brick;
(3) drying and forming treatment: transferring the green bricks obtained in the step (2) to a drying box, drying, and removing brick making molds to obtain bricks;
(4) and (3) maintenance treatment: and (4) transferring the bricks obtained in the step (3) into a curing chamber for curing.
In the above-described environment-friendly recycled concrete block,
and (2) controlling the temperature in the concrete mixing tank in the step (1) within 60 ℃.
In the above-described environment-friendly recycled concrete block,
the pressure of the pressing in the step (2) is 6.5 MPa.
In the above-described environment-friendly recycled concrete block,
the temperature for drying in step (3) was 150 ℃.
In the above-described environment-friendly recycled concrete block,
the temperature in the curing chamber in the step (4) is 20 ℃;
the humidity in the curing room in the step (4) is 75 percent;
the period in the curing chamber in the step (4) is 72 hours.
Example 3
The environment-friendly recycled concrete brick comprises the following raw materials in parts by weight:
cement: 95 parts of (a) a reaction product of (B),
water: 75 parts of (a) a water-soluble polymer,
waste concrete blocks: 32 parts of (a) to (b),
calcium hydroxide: 20 parts of (by weight), and mixing the components,
reinforcing agent: 8 parts of (a) a mixture of (b),
polycarboxylic acid water reducing agent: 9 parts of (a) to (b),
dispersing agent: and 3 parts.
In the above-described environment-friendly recycled concrete block,
the reinforcing agent comprises polyoxyethylene, polyurethane and vinyl silane, wherein the mass ratio of the polyoxyethylene to the polyurethane to the vinyl silane is 1:2: 1.
in the above-described environment-friendly recycled concrete block,
the cement is P.O 42.5.5R portland cement;
the average grain diameter of the waste concrete blocks is 3 mm;
the average grain diameter of the calcium hydroxide is 1 mm;
the polycarboxylic acid water reducing agent is 412, and is purchased from Shenyang Xingzheng and chemical engineering Limited company;
the dispersant is WHDF-S, which is purchased from Shandong seven-wood Tianyi New Material Co.
In the environment-friendly recycled concrete brick, the preparation method of the environment-friendly recycled concrete brick comprises the following steps:
(1) raw material treatment: transferring the cement, water, the waste concrete blocks, calcium hydroxide, a reinforcing agent, a polycarboxylic acid water reducing agent and a dispersing agent to an outdoor concrete stirring tank, and fully and uniformly stirring to obtain a mortar mixture;
(2) making green bricks: transferring the mortar mixture obtained in the step (1) into a brick making mold, and pressing to obtain a green brick;
(3) drying and forming treatment: transferring the green bricks obtained in the step (2) to a drying box, drying, and removing brick making molds to obtain bricks;
(4) and (3) maintenance treatment: and (4) transferring the bricks obtained in the step (3) into a curing chamber for curing.
In the above-described environment-friendly recycled concrete block,
and (2) controlling the temperature in the concrete mixing tank in the step (1) within 60 ℃.
In the above-described environment-friendly recycled concrete block,
the pressure of the pressing in the step (2) is 6.5 MPa.
In the above-described environment-friendly recycled concrete block,
the temperature for drying in step (3) was 150 ℃.
In the above-described environment-friendly recycled concrete block,
the temperature in the curing chamber in the step (4) is 20 ℃;
the humidity in the curing room in the step (4) is 75 percent;
the period in the curing chamber in the step (4) is 72 hours.
Example 4
The environment-friendly recycled concrete brick comprises the following raw materials in parts by weight:
cement: 110 parts of (a) by weight of,
water: 65 parts of (a) a reaction product of (B),
waste concrete blocks: 36 parts of (a) to (b),
calcium hydroxide: 15 parts of (a) to (b),
reinforcing agent: 12 parts of (a) to (b),
polycarboxylic acid water reducing agent: 6 parts of (a) a mixture of (b),
dispersing agent: 8 parts.
In the above-described environment-friendly recycled concrete block,
the reinforcing agent comprises polyoxyethylene, polyurethane and vinyl silane, wherein the mass ratio of the polyoxyethylene to the polyurethane to the vinyl silane is 1:2: 1.
in the above-described environment-friendly recycled concrete block,
the cement is P.O 42.5.5R portland cement;
the average grain diameter of the waste concrete blocks is 3 mm;
the average grain diameter of the calcium hydroxide is 1 mm;
the polycarboxylic acid water reducing agent is 412, and is purchased from Shenyang Xingzheng and chemical engineering Limited company;
the dispersant is WHDF-S, which is purchased from Shandong seven-wood Tianyi New Material Co.
In the environment-friendly recycled concrete brick, the preparation method of the environment-friendly recycled concrete brick comprises the following steps:
(1) raw material treatment: transferring the cement, water, the waste concrete blocks, calcium hydroxide, a reinforcing agent, a polycarboxylic acid water reducing agent and a dispersing agent to an outdoor concrete stirring tank, and fully and uniformly stirring to obtain a mortar mixture;
(2) making green bricks: transferring the mortar mixture obtained in the step (1) into a brick making mold, and pressing to obtain a green brick;
(3) drying and forming treatment: transferring the green bricks obtained in the step (2) to a drying box, drying, and removing brick making molds to obtain bricks;
(4) and (3) maintenance treatment: and (4) transferring the bricks obtained in the step (3) into a curing chamber for curing.
In the above-described environment-friendly recycled concrete block,
and (2) controlling the temperature in the concrete mixing tank in the step (1) within 60 ℃.
In the above-described environment-friendly recycled concrete block,
the pressure of the pressing in the step (2) is 6.5 MPa.
In the above-described environment-friendly recycled concrete block,
the temperature for drying in step (3) was 150 ℃.
In the above-described environment-friendly recycled concrete block,
the temperature in the curing chamber in the step (4) is 20 ℃;
the humidity in the curing room in the step (4) is 75 percent;
the period in the curing chamber in the step (4) is 72 hours.
Example 5
The environment-friendly recycled concrete brick comprises the following raw materials in parts by weight:
cement: 105 parts of (a) to (b),
water: 70 parts of (a) to (b),
waste concrete blocks: 34 parts of (a) to (b),
calcium hydroxide: 18 parts of (a) to (b),
reinforcing agent: 10 parts of (a) to (b),
polycarboxylic acid water reducing agent: 8 parts of (a) a mixture of (b),
dispersing agent: 5 parts of the raw materials.
In the above-described environment-friendly recycled concrete block,
the reinforcing agent comprises polyoxyethylene, polyurethane and vinyl silane, wherein the mass ratio of the polyoxyethylene to the polyurethane to the vinyl silane is 1:2: 1.
in the above-described environment-friendly recycled concrete block,
the cement is P.O 42.5.5R portland cement;
the average grain diameter of the waste concrete blocks is 3 mm;
the average grain diameter of the calcium hydroxide is 1 mm;
the polycarboxylic acid water reducing agent is 412, and is purchased from Shenyang Xingzheng and chemical engineering Limited company;
the dispersant is WHDF-S, which is purchased from Shandong seven-wood Tianyi New Material Co.
In the environment-friendly recycled concrete brick, the preparation method of the environment-friendly recycled concrete brick comprises the following steps:
(1) raw material treatment: transferring the cement, water, the waste concrete blocks, calcium hydroxide, a reinforcing agent, a polycarboxylic acid water reducing agent and a dispersing agent to an outdoor concrete stirring tank, and fully and uniformly stirring to obtain a mortar mixture;
(2) making green bricks: transferring the mortar mixture obtained in the step (1) into a brick making mold, and pressing to obtain a green brick;
(3) drying and forming treatment: transferring the green bricks obtained in the step (2) to a drying box, drying, and removing brick making molds to obtain bricks;
(4) and (3) maintenance treatment: and (4) transferring the bricks obtained in the step (3) into a curing chamber for curing.
In the above-described environment-friendly recycled concrete block,
and (2) controlling the temperature in the concrete mixing tank in the step (1) within 60 ℃.
In the above-described environment-friendly recycled concrete block,
the pressure of the pressing in the step (2) is 6.5 MPa.
In the above-described environment-friendly recycled concrete block,
the temperature for drying in step (3) was 150 ℃.
In the above-described environment-friendly recycled concrete block,
the temperature in the curing chamber in the step (4) is 20 ℃;
the humidity in the curing room in the step (4) is 75 percent;
the period in the curing chamber in the step (4) is 72 hours.
Comparative example 1
The environment-friendly recycled concrete brick comprises the following raw materials in parts by weight:
cement: 105 parts of (a) to (b),
water: 70 parts of (a) to (b),
waste concrete blocks: 34 parts of (a) to (b),
calcium hydroxide: 18 parts of (a) to (b),
reinforcing agent: 10 parts of (a) to (b),
polycarboxylic acid water reducing agent: 8 parts of (a) a mixture of (b),
dispersing agent: 5 parts of the raw materials.
In the above-described environment-friendly recycled concrete block,
the reinforcing agent comprises polyoxyethylene, polyurethane and vinyl silane, wherein the mass ratio of the polyoxyethylene to the polyurethane to the vinyl silane is 1: 1: 1.
in the above-described environment-friendly recycled concrete block,
the cement is P.O 42.5.5R portland cement;
the average grain diameter of the waste concrete blocks is 3 mm;
the average grain diameter of the calcium hydroxide is 1 mm;
the polycarboxylic acid water reducing agent is 412, and is purchased from Shenyang Xingzheng and chemical engineering Limited company;
the dispersant is WHDF-S, which is purchased from Shandong seven-wood Tianyi New Material Co.
In the environment-friendly recycled concrete brick, the preparation method of the environment-friendly recycled concrete brick comprises the following steps:
(1) raw material treatment: transferring the cement, water, the waste concrete blocks, calcium hydroxide, a reinforcing agent, a polycarboxylic acid water reducing agent and a dispersing agent to an outdoor concrete stirring tank, and fully and uniformly stirring to obtain a mortar mixture;
(2) making green bricks: transferring the mortar mixture obtained in the step (1) into a brick making mold, and pressing to obtain a green brick;
(3) drying and forming treatment: transferring the green bricks obtained in the step (2) to a drying box, drying, and removing brick making molds to obtain bricks;
(4) and (3) maintenance treatment: and (4) transferring the bricks obtained in the step (3) into a curing chamber for curing.
In the above-described environment-friendly recycled concrete block,
and (2) controlling the temperature in the concrete mixing tank in the step (1) within 60 ℃.
In the above-described environment-friendly recycled concrete block,
the pressure of the pressing in the step (2) is 6.5 MPa.
In the above-described environment-friendly recycled concrete block,
the temperature for drying in step (3) was 150 ℃.
In the above-described environment-friendly recycled concrete block,
the temperature in the curing chamber in the step (4) is 20 ℃;
the humidity in the curing room in the step (4) is 75 percent;
the period in the curing chamber in the step (4) is 72 hours.
Comparative example 2
The environment-friendly recycled concrete brick comprises the following raw materials in parts by weight:
cement: 105 parts of (a) to (b),
water: 70 parts of (a) to (b),
waste concrete blocks: 34 parts of (a) to (b),
calcium hydroxide: 18 parts of (a) to (b),
reinforcing agent: 10 parts of (a) to (b),
polycarboxylic acid water reducing agent: 8 parts of (a) a mixture of (b),
dispersing agent: 5 parts of the raw materials.
In the above-described environment-friendly recycled concrete block,
the reinforcing agent comprises polyethylene oxide and polyurethane, wherein the mass ratio of the polyethylene oxide to the polyurethane is 1: 2.
in the above-described environment-friendly recycled concrete block,
the cement is P.O 42.5.5R portland cement;
the average grain diameter of the waste concrete blocks is 3 mm;
the average grain diameter of the calcium hydroxide is 1 mm;
the polycarboxylic acid water reducing agent is 412, and is purchased from Shenyang Xingzheng and chemical engineering Limited company;
the dispersant is WHDF-S, which is purchased from Shandong seven-wood Tianyi New Material Co.
In the environment-friendly recycled concrete brick, the preparation method of the environment-friendly recycled concrete brick comprises the following steps:
(1) raw material treatment: transferring the cement, water, the waste concrete blocks, calcium hydroxide, a reinforcing agent, a polycarboxylic acid water reducing agent and a dispersing agent to an outdoor concrete stirring tank, and fully and uniformly stirring to obtain a mortar mixture;
(2) making green bricks: transferring the mortar mixture obtained in the step (1) into a brick making mold, and pressing to obtain a green brick;
(3) drying and forming treatment: transferring the green bricks obtained in the step (2) to a drying box, drying, and removing brick making molds to obtain bricks;
(4) and (3) maintenance treatment: and (4) transferring the bricks obtained in the step (3) into a curing chamber for curing.
In the above-described environment-friendly recycled concrete block,
and (2) controlling the temperature in the concrete mixing tank in the step (1) within 60 ℃.
In the above-described environment-friendly recycled concrete block,
the pressure of the pressing in the step (2) is 6.5 MPa.
In the above-described environment-friendly recycled concrete block,
the temperature for drying in step (3) was 150 ℃.
In the above-described environment-friendly recycled concrete block,
the temperature in the curing chamber in the step (4) is 20 ℃;
the humidity in the curing room in the step (4) is 75 percent;
the period in the curing chamber in the step (4) is 72 hours.
Comparative example 3
The environment-friendly recycled concrete brick comprises the following raw materials in parts by weight:
cement: 105 parts of (a) to (b),
water: 70 parts of (a) to (b),
waste concrete blocks: 34 parts of (a) to (b),
calcium hydroxide: 18 parts of (a) to (b),
reinforcing agent: 10 parts of (a) to (b),
polycarboxylic acid water reducing agent: 8 parts of (a) a mixture of (b),
dispersing agent: 5 parts of the raw materials.
In the above-described environment-friendly recycled concrete block,
the reinforcing agent comprises polyurethane and vinyl silane, wherein the mass ratio of the polyurethane to the vinyl silane is 2: 1.
in the above-described environment-friendly recycled concrete block,
the cement is P.O 42.5.5R portland cement;
the average grain diameter of the waste concrete blocks is 3 mm;
the average grain diameter of the calcium hydroxide is 1 mm;
the polycarboxylic acid water reducing agent is 412, and is purchased from Shenyang Xingzheng and chemical engineering Limited company;
the dispersant is WHDF-S, which is purchased from Shandong seven-wood Tianyi New Material Co.
In the environment-friendly recycled concrete brick, the preparation method of the environment-friendly recycled concrete brick comprises the following steps:
(1) raw material treatment: transferring the cement, water, the waste concrete blocks, calcium hydroxide, a reinforcing agent, a polycarboxylic acid water reducing agent and a dispersing agent to an outdoor concrete stirring tank, and fully and uniformly stirring to obtain a mortar mixture;
(2) making green bricks: transferring the mortar mixture obtained in the step (1) into a brick making mold, and pressing to obtain a green brick;
(3) drying and forming treatment: transferring the green bricks obtained in the step (2) to a drying box, drying, and removing brick making molds to obtain bricks;
(4) and (3) maintenance treatment: and (4) transferring the bricks obtained in the step (3) into a curing chamber for curing.
In the above-described environment-friendly recycled concrete block,
and (2) controlling the temperature in the concrete mixing tank in the step (1) within 60 ℃.
In the above-described environment-friendly recycled concrete block,
the pressure of the pressing in the step (2) is 6.5 MPa.
In the above-described environment-friendly recycled concrete block,
the temperature for drying in step (3) was 150 ℃.
In the above-described environment-friendly recycled concrete block,
the temperature in the curing chamber in the step (4) is 20 ℃;
the humidity in the curing room in the step (4) is 75 percent;
the period in the curing chamber in the step (4) is 72 hours.
Comparative example 4
The environment-friendly recycled concrete brick comprises the following raw materials in parts by weight:
cement: 105 parts of (a) to (b),
water: 70 parts of (a) to (b),
waste concrete blocks: 34 parts of (a) to (b),
calcium hydroxide: 18 parts of (a) to (b),
polycarboxylic acid water reducing agent: 8 parts of (a) a mixture of (b),
dispersing agent: 5 parts of the raw materials.
In the above-described environment-friendly recycled concrete block,
the cement is P.O 42.5.5R portland cement;
the average grain diameter of the waste concrete blocks is 3 mm;
the average grain diameter of the calcium hydroxide is 1 mm;
the polycarboxylic acid water reducing agent is 412, and is purchased from Shenyang Xingzheng and chemical engineering Limited company;
the dispersant is WHDF-S, which is purchased from Shandong seven-wood Tianyi New Material Co.
In the environment-friendly recycled concrete brick, the preparation method of the environment-friendly recycled concrete brick comprises the following steps:
(1) raw material treatment: transferring the cement, water, the waste concrete blocks, the calcium hydroxide, the polycarboxylic acid water reducing agent and the dispersing agent to an outdoor concrete stirring tank, and fully and uniformly stirring to obtain a mortar mixture;
(2) making green bricks: transferring the mortar mixture obtained in the step (1) into a brick making mold, and pressing to obtain a green brick;
(3) drying and forming treatment: transferring the green bricks obtained in the step (2) to a drying box, drying, and removing brick making molds to obtain bricks;
(4) and (3) maintenance treatment: and (4) transferring the bricks obtained in the step (3) into a curing chamber for curing.
In the above-described environment-friendly recycled concrete block,
and (2) controlling the temperature in the concrete mixing tank in the step (1) within 60 ℃.
In the above-described environment-friendly recycled concrete block,
the pressure of the pressing in the step (2) is 6.5 MPa.
In the above-described environment-friendly recycled concrete block,
the temperature for drying in step (3) was 150 ℃.
In the above-described environment-friendly recycled concrete block,
the temperature in the curing chamber in the step (4) is 20 ℃;
the humidity in the curing room in the step (4) is 75 percent;
the period in the curing chamber in the step (4) is 72 hours.
Comparative example 5
The environment-friendly recycled concrete brick comprises the following raw materials in parts by weight:
cement: 105 parts of (a) to (b),
water: 70 parts of (a) to (b),
waste concrete blocks: 34 parts of (a) to (b),
reinforcing agent: 10 parts of (a) to (b),
polycarboxylic acid water reducing agent: 8 parts of (a) a mixture of (b),
dispersing agent: 5 parts of the raw materials.
In the above-described environment-friendly recycled concrete block,
the reinforcing agent comprises polyoxyethylene, polyurethane and vinyl silane, wherein the mass ratio of the polyoxyethylene to the polyurethane to the vinyl silane is 1:2: 1.
in the above-described environment-friendly recycled concrete block,
the cement is P.O 42.5.5R portland cement;
the average grain diameter of the waste concrete blocks is 3 mm;
the average grain diameter of the calcium hydroxide is 1 mm;
the polycarboxylic acid water reducing agent is 412, and is purchased from Shenyang Xingzheng and chemical engineering Limited company;
the dispersant is WHDF-S, which is purchased from Shandong seven-wood Tianyi New Material Co.
In the environment-friendly recycled concrete brick, the preparation method of the environment-friendly recycled concrete brick comprises the following steps:
(1) raw material treatment: transferring the cement, water, the waste concrete blocks, the reinforcing agent, the polycarboxylic acid water reducing agent and the dispersing agent to an outdoor concrete stirring tank, and fully and uniformly stirring to obtain a mortar mixture;
(2) making green bricks: transferring the mortar mixture obtained in the step (1) into a brick making mold, and pressing to obtain a green brick;
(3) drying and forming treatment: transferring the green bricks obtained in the step (2) to a drying box, drying, and removing brick making molds to obtain bricks;
(4) and (3) maintenance treatment: and (4) transferring the bricks obtained in the step (3) into a curing chamber for curing.
In the above-described environment-friendly recycled concrete block,
and (2) controlling the temperature in the concrete mixing tank in the step (1) within 60 ℃.
In the above-described environment-friendly recycled concrete block,
the pressure of the pressing in the step (2) is 6.5 MPa.
In the above-described environment-friendly recycled concrete block,
the temperature for drying in step (3) was 150 ℃.
In the above-described environment-friendly recycled concrete block,
the temperature in the curing chamber in the step (4) is 20 ℃;
the humidity in the curing room in the step (4) is 75 percent;
the period in the curing chamber in the step (4) is 72 hours.
Comparative example 6
In the prior art, publication No. CN109369093A discloses an environment-friendly concrete brick and a processing technology thereof, and the specification thereof discloses the following scheme:
"an environment-friendly concrete brick and its processing technology, include the following steps specifically:
(1) the feed comprises the following raw materials in parts by weight: 20 parts of waste bricks, 30 parts of cement, 15 parts of sand, 35 parts of broken stone, 20 parts of water and 20 parts of coal cinder;
(2) crushing the waste bricks, controlling the crushed particle size to be 20-40mm, screening qualified crushed particles of the waste bricks, and crushing unqualified waste bricks again;
(3) mixing and stirring the raw materials uniformly, pouring the mixture into a mold and pressing the mixture into a semi-finished product of the concrete brick;
(4) and demolding the semi-finished concrete brick, taking out the semi-finished concrete brick from a shade place, and naturally air-drying to obtain the environment-friendly concrete brick.
Wherein, in the step (2), a jaw crusher is adopted. In the step (3), the pressing pressure was 25MPa, and the pressing time was 20s ".
Comparative example 7
In the prior art, publication number is CN105174894A, which discloses an autoclaved aerated concrete brick and a preparation method thereof, and the specification thereof discloses the following scheme:
"(1), 2000kg of fly ash, 400kg of waste (waste generated in the production of autoclaved aerated concrete bricks) and 200kg of gypsum were added with an appropriate amount of water to prepare a slurry having a specific gravity of 1.48 g/mL.
(2) And crushing 350kg of lime with the digestion time of 13 minutes and the digestion temperature of 55 ℃ and the mass content of the effective calcium oxide of 58.98 percent, and ball-milling the crushed lime until the sieve residue with the fineness of 0.08mm is less than 25 percent.
(3) 1.5kg of aluminum powder and a proper amount of water are mixed to form an aluminum powder suspension.
(4) Uniformly mixing the treated lime, the treated slurry, 50kg of cement and water, adding the aluminum powder suspension 1 minute before casting, uniformly mixing to form the casting material, and controlling the diffusivity of the casting material to be 14 cm.
(5) And oiling in the die to facilitate subsequent demolding, pouring the pouring material into the die, controlling the pouring temperature to be 48 ℃ and the pouring time to be 4 minutes.
(6) And pushing the cast mould into a static curing room for static curing at 40 ℃ for 3 hours.
(7) And demolding the blank after standing and precuring, cutting, recovering cutting waste materials, and cleaning and deoiling the die.
(8) And feeding the cut blank into an autoclave, vacuumizing the autoclave within 20 minutes until the reading of a pressure gauge is-0.05 MPa, then filling steam, raising the reading of the pressure gauge to 1.1MPa within 90 minutes at 190 ℃, maintaining at constant temperature and constant pressure for 10 hours, then reducing the reading of the pressure gauge to 0MPa within 120 minutes, and reducing the temperature to room temperature to obtain the finished product.
Comparative example 8
In the prior art, the publication number is CN109265180A, which discloses a high compression-resistant pervious concrete brick and a preparation method thereof, and the specification thereof discloses the following scheme:
' a high compression resistance pervious concrete brick, which comprises the following raw material components in parts by weight: 100 parts of building waste stone, 10 parts of mineral powder, 5 parts of titanium carbide, 4 parts of alumina, 2 parts of nano titanium dioxide, 4 parts of quartz powder, 10 parts of kaolin, 8 parts of rectorite powder, 4 parts of ceramic fiber, 3 parts of glass microsphere, 2 parts of water reducing agent and 4 parts of curing agent, wherein:
the curing agent consists of water glass, absolute ethyl alcohol, hydroxymethyl cellulose, sodium fluosilicate, sulfonated oil, polyacrylamide and calcium lignosulfonate according to the weight part ratio of 5:2:1:2:3:4: 2.
The preparation method of the high-compression-resistance pervious concrete brick comprises the following steps:
(1) crushing raw materials: the construction waste stone is put into a vibrating tamper according to raw material components to be smashed, and then the smashing machine is added to be smashed to obtain a smashed material;
(2) mixing raw materials: adding mineral powder, titanium carbide, alumina, nano titanium dioxide, quartz powder, kaolin, rectorite powder and a water reducing agent into the crushed material obtained in the step (1) according to raw material components, fully mixing, adding a stirrer, and mixing and stirring at high and low speeds to obtain a mixture A, wherein: the high-speed and low-speed mixing and stirring of the stirrer comprises a high-speed stirring stage of a first stage and a low-speed stirring stage of a second stage, wherein the low-speed stirring stage of the second stage is carried out after the high-speed stirring stage of the first stage is completed, the high-speed stirring speed of the high-speed stirring stage of the first stage is 5000 rpm, and the stirring time is 15 minutes; the low-speed stirring speed of the low-speed stirring stage of the second stage is 200 revolutions per minute, and the stirring time is 15 minutes;
(3) adding a curing agent: adding ceramic fibers, glass beads and a curing agent into the mixture A obtained in the step (2) according to raw material components, fully mixing, and then adding into a mixing roll for mixing to obtain a mixture B, wherein the mixing temperature of the mixing roll is 180 ℃, and the mixing time is 40 minutes;
(4) molding a mold: injecting the mixture B obtained in the step (3) into a brick mold, and heating and pressurizing for forming to obtain a blank brick, wherein: the heating and pressurizing temperature is set at 280 ℃, the pressure is set at 1.2 MPa, and the heating and pressurizing reaction time is 2 hours;
(5) and (3) calcining: and (5) putting the blank brick obtained in the step (4) into a calcining furnace for calcining to obtain the high-compression-resistance pervious concrete brick, wherein: the calcining temperature of the calcining furnace is 1200 ℃, the calcining time is 2 hours, then the furnace temperature is reduced to 900 ℃, the temperature is kept for 1.5 hours, and then the furnace is slowly cooled to the room temperature ".
Test protocol
The technical schemes of examples 1-5 and comparative examples 1-8 were selected and tested with reference to the following references:
(1) application No.: CN201110345926.0, publication No.: CN103086655B, discloses a concrete brick and a preparation method thereof;
(2) application No.: CN201410853189.9, publication No.: CN104844099B, discloses a concrete brick using waste rubber powder and a preparation method thereof;
(3) influence of fly ash to recycled concrete brick performance [ J ] novel building material 2020,047(002):92-94,99 ].
TABLE 1 test results
As shown in Table 1, compared with comparative examples 1-8, in the application, the concrete prepared in examples 1-5 has excellent overall performance, various testing parameters are superior to those of the prior art, meanwhile, the waste materials such as waste concrete blocks are utilized to realize recycling, and low-toxicity substances such as calcium hydroxide, polyethylene oxide, polyurethane, vinyl silane and the like are adopted in the components, so that the environmental hazard is small; specifically, the concrete prepared by the method has the slump range shown by experimentsAt 189mm-206mm, the spread degree ranges from 540mm-564mm, the emptying time of the inverted slump cone ranges from 5.7s to 6.5s, and the mortar viscosity ranges from 12.5Pa . s-14.0Pa . The compression strength of s and 28d ranges from 92.5MPa to 95.4MPa, and the compression strength of 56d ranges from 104.3MPa to 112.5 MPa. The application sets contrast in comparative examples 1-5, which brings significant difference in effect for comparing important components in the application; specifically, in comparative example 1, by changing the ratio of the three substances in the reinforcing agent, a decrease in performance occurred, for example, slump was only 219mm, spreading was only 523mm, emptying time of the inverted slump cone was only 7.2s, and mortar viscosity was only 12.1Pa . s, 28d compressive strength is only 90.7MPa, 56d compressive strength is only 98.7MPa, which shows that the three substances have synergistic effect, even if the dosage proportion is changed, the performance is reduced, and for better verification, the following adjustment is carried out, wherein the mass ratio of the polyoxyethylene to the polyurethane to the vinyl silane is 2:1: 1. 1: 1:2, but the performance is still poor, and the overall average reduction is about 10 percent; in comparative example 2 and comparative example 3, in which vinyl silane and polyethylene oxide were removed, respectively, and in comparative example 4, in which all components of the whole reinforcing agent were removed, we could find that the lowest slump value was 262mm, the lowest slump value was 482mm, the lowest slump value was 8.9s, the lowest slump viscosity was 10.1Pa . The lowest value of the s and 28d compressive strengths is 83.0MPa, and the lowest value of the 56d compressive strength is 91.5MPa, which shows that the use of three substances, namely polyethylene oxide, polyurethane and vinyl silane, improves the mechanical property of concrete and reduces the probability of shrinkage cracking. Meanwhile, in comparative example 5, it can be found that calcium hydroxide also plays a certain role in promotion.
In addition, in comparative examples 6 to 8, the overall effects are inferior to the data of examples 1 to 5 of the present application, and the reason is presumed as follows: (1) the adoption of the coal slag or the fly ash causes the reduction of the viscosity of the concrete, reduces the tensile degree of the concrete, and causes more holes to be formed in the concrete, thereby causing higher brittleness; (2) the use of aluminum powder suspensions increases manufacturing costs and causes concrete to settle; (3) the use of titanium carbide, nano titanium dioxide and glass beads has high cost and very poor actual use effect, and 28d and 56d compressive strength tests show that the concrete brick has great downward sliding in strength.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and substitutions can be made without departing from the technical principle of the present invention, and these modifications and substitutions should also be regarded as the protection scope of the present invention.
Claims (10)
1. The environment-friendly recycled concrete brick is characterized by comprising the following raw materials in parts by weight:
cement: 90 to 120 portions of the mixture of the components,
water: 60 to 80 portions of the raw materials are mixed,
waste concrete blocks: 30 to 40 portions of the raw materials are mixed,
calcium hydroxide: 15 to 20 portions of the raw materials are mixed,
reinforcing agent: 5 to 15 portions of the raw materials are mixed,
polycarboxylic acid water reducing agent: 5 to 10 portions of the raw materials are mixed,
dispersing agent: 3-8 parts.
2. The environment-friendly recycled concrete brick according to claim 1, wherein:
the composite material comprises the following raw materials in parts by weight:
cement: 95 to 110 portions of the mixture of the components,
water: 65 to 75 portions of the weight percentage of the mixture,
waste concrete blocks: 32 to 36 portions of the raw materials are mixed,
calcium hydroxide: 15 to 20 portions of the raw materials are mixed,
reinforcing agent: 8 to 12 portions of the raw materials are mixed,
polycarboxylic acid water reducing agent: 6 to 9 portions of the raw materials are mixed,
dispersing agent: 3-8 parts.
3. The environment-friendly recycled concrete brick according to claim 2, wherein:
the composite material comprises the following raw materials in parts by weight:
cement: 105 parts of (a) to (b),
water: 70 parts of (a) to (b),
waste concrete blocks: 34 parts of (a) to (b),
calcium hydroxide: 18 parts of (a) to (b),
reinforcing agent: 10 parts of (a) to (b),
polycarboxylic acid water reducing agent: 8 parts of (a) a mixture of (b),
dispersing agent: 5 parts of the raw materials.
4. The environment-friendly recycled concrete brick according to claim 3, wherein:
the reinforcing agent comprises polyoxyethylene, polyurethane and vinyl silane, wherein the mass ratio of the polyoxyethylene to the polyurethane to the vinyl silane is 1:2: 1.
5. the environment-friendly recycled concrete brick according to claim 3, wherein:
the cement is P.O 42.5.5R portland cement;
the average grain diameter of the waste concrete blocks is 3 mm;
the average grain diameter of the calcium hydroxide is 1 mm;
the polycarboxylic acid water reducing agent is 412, and is purchased from Shenyang Xingzheng and chemical engineering Limited company;
the dispersant is WHDF-S, which is purchased from Shandong seven-wood Tianyi New Material Co.
6. The environment-friendly recycled concrete brick according to claim 3, wherein:
the preparation method of the environment-friendly recycled concrete brick comprises the following steps:
(1) raw material treatment: transferring the cement, water, the waste concrete blocks, calcium hydroxide, a reinforcing agent, a polycarboxylic acid water reducing agent and a dispersing agent to an outdoor concrete stirring tank, and fully and uniformly stirring to obtain a mortar mixture;
(2) making green bricks: transferring the mortar mixture obtained in the step (1) into a brick making mold, and pressing to obtain a green brick;
(3) drying and forming treatment: transferring the green bricks obtained in the step (2) to a drying box, drying, and removing brick making molds to obtain bricks;
(4) and (3) maintenance treatment: and (4) transferring the bricks obtained in the step (3) into a curing chamber for curing.
7. The environment-friendly recycled concrete brick of claim 6, wherein:
and (2) controlling the temperature in the concrete mixing tank in the step (1) within 60 ℃.
8. The environment-friendly recycled concrete brick of claim 6, wherein:
the pressure of the pressing in the step (2) is 6.5 MPa.
9. The environment-friendly recycled concrete brick of claim 6, wherein:
the temperature for drying in step (3) was 150 ℃.
10. The environment-friendly recycled concrete brick of claim 6, wherein:
the temperature in the curing chamber in the step (4) is 20 ℃;
the humidity in the curing room in the step (4) is 75 percent;
the period in the curing chamber in the step (4) is 72 hours.
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| CN112430044A (en) * | 2020-12-11 | 2021-03-02 | 深圳市恒星建材有限公司 | Chlorine ion erosion resistant permeable recycled concrete and preparation method thereof |
| CN113121165A (en) * | 2019-12-31 | 2021-07-16 | 同济大学 | Fully recycled concrete and preparation method thereof |
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2021
- 2021-11-03 CN CN202111291929.0A patent/CN113929396A/en not_active Withdrawn
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108726956A (en) * | 2018-08-08 | 2018-11-02 | 宝辰永宇（滁州）新材料科技有限公司 | A kind of modification regeneration concrete and preparation method thereof |
| CN109293312A (en) * | 2018-11-19 | 2019-02-01 | 广西科技大学 | A kind of cracking resistance regeneration concrete and preparation method thereof |
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| CN112062507A (en) * | 2020-09-14 | 2020-12-11 | 北京新奥混凝土集团有限公司 | Concrete containing recycled waste brick fine aggregate |
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