CN114195422B - Composite reinforcing agent, preparation method and application thereof, and preparation method of recycled concrete pavement brick - Google Patents
Composite reinforcing agent, preparation method and application thereof, and preparation method of recycled concrete pavement brick Download PDFInfo
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- CN114195422B CN114195422B CN202111526860.5A CN202111526860A CN114195422B CN 114195422 B CN114195422 B CN 114195422B CN 202111526860 A CN202111526860 A CN 202111526860A CN 114195422 B CN114195422 B CN 114195422B
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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
- 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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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C5/00—Pavings made of prefabricated single units
- E01C5/06—Pavings made of prefabricated single units made of units with cement or like binders
- E01C5/065—Pavings made of prefabricated single units made of units with cement or like binders characterised by their structure or component materials, e.g. concrete layers of different structure, special additives
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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
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/00612—Uses not provided for elsewhere in C04B2111/00 as one or more layers of a layered structure
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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
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
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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
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
- C04B2201/52—High compression strength concretes, i.e. with a compression strength higher than about 55 N/mm2, e.g. reactive powder concrete [RPC]
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
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- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Road Paving Structures (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention provides a composite reinforcing agent, a preparation method and application thereof, and a preparation method of a recycled concrete pavement brick, and relates to the technical field of building materials. The composite reinforcing agent provided by the invention comprises the following preparation raw materials in parts by weight: 15-22 parts of anionic surfactant, 7-14 parts of nonionic surfactant, 3-5 parts of stabilizer and 59-75 parts of water. The composite reinforcing agent provided by the invention adopts a compounding system of an anionic surfactant and a nonionic surfactant, is added into the recycled concrete pavement brick, can reduce the surface tension of a cement adhesive material and a recycled aggregate, and reduce the water-adhesive ratio of the pavement brick, and can enable the brick body to be more compact due to the lubricating action when the pavement brick is vibrated and pressurized for molding, so that the strength of the brick is improved, and the composite reinforcing agent is more favorable for molding and demolding of the pavement brick. The composite reinforcing agent can be used for preparing the pavior brick, and the strength and the quality stability of the pavior brick can be obviously improved under the condition of the same cement using amount.
Description
Technical Field
The invention relates to the technical field of building materials, in particular to a composite reinforcing agent, a preparation method and application thereof, and a preparation method of a recycled concrete pavement brick.
Background
The construction waste is a product which is not negligible in the national economic development and urbanization process, and the treatment mode of piling or landfill and the like for treating the construction waste can cause serious environmental problems and resource waste and can seriously affect the national sustainable development. How to better treat and utilize huge amount of construction wastes as resources is an important task at present. The method is a relatively effective method for recycling the construction waste, wherein the construction waste is crushed into the recycled aggregates with different particle sizes, and the recycled aggregates with medium and small particle sizes are used for preparing the recycled concrete pavement bricks.
The recycled concrete pavement brick is mainly formed by uniformly stirring cement, recycled aggregate and water by equipment and then pressing and curing the materials by special brick machine production equipment, and is one of the more common products of recycling construction wastes at the present stage. However, as indexes such as strength, particle size distribution, water absorption and the like of the recycled aggregate, particularly the recycled fine aggregate, are much poorer than those of the natural aggregate, when the recycled concrete pavement brick is prepared by replacing the natural aggregate, more cement glue materials are needed to be used for achieving the same strength, and the prepared pavement brick has poorer strength stability. Therefore, the technical innovation is urgently needed, and the recycled concrete pavement brick with high strength and stability can be prepared under the condition of the same cement glue material consumption.
Disclosure of Invention
The invention aims to provide a composite reinforcing agent, a preparation method and application thereof, and a preparation method of a recycled concrete pavement brick.
In order to achieve the above object, the present invention provides the following technical solutions:
the invention provides a composite reinforcing agent, which comprises the following preparation raw materials in parts by weight:
15-22 parts of anionic surfactant, 7-14 parts of nonionic surfactant, 3-5 parts of stabilizer and 59-75 parts of water.
Preferably, the anionic surfactant comprises sodium dodecyl benzene sulfonate and sodium fatty alcohol-polyoxyethylene ether sulfate; the mass ratio of the sodium dodecyl benzene sulfonate to the sodium fatty alcohol-polyoxyethylene ether sulfate is (9-12): 6 to 10.
Preferably, the nonionic surfactant comprises fatty alcohol polyoxyethylene ether and coconut oil fatty acid diethanolamide; the mass ratio of the fatty alcohol-polyoxyethylene ether to the coconut oil fatty acid diethanolamide is 5-10: 2 to 4.
Preferably, the stabilizer is a betaine-type amphoteric surfactant.
Preferably, the betaine-type amphoteric surfactant comprises an alkyl betaine, an alkylamide betaine, an alkyl sultaine or an alkylamide hydroxysultaine.
The invention provides a preparation method of the composite reinforcing agent in the technical scheme, which comprises the following steps:
mixing anionic surfactant, nonionic surfactant, stabilizer and water to obtain the composite reinforcing agent.
The invention provides an application of the composite reinforcing agent prepared by the technical scheme or the preparation method in the technical scheme in preparation of recycled concrete pavement bricks.
Preferably, the mass content of the composite reinforcing agent in the recycled concrete pavement brick is 0.1-0.3%.
The invention provides a preparation method of recycled concrete pavement bricks, which comprises the following steps:
mixing cement, recycled aggregate, a reinforcing agent and water to obtain a bottom material; the reinforcing agent is the composite reinforcing agent prepared by the preparation method of the technical scheme or the composite reinforcing agent prepared by the preparation method of the technical scheme;
mixing cement, river sand and water to obtain a fabric;
sequentially laying a bottom material and a surface material, and vibrating, pressurizing and forming to obtain a green brick;
and maintaining the green brick to obtain the recycled concrete pavement brick.
Preferably, the thickness of the fabric is 5-8 mm.
The invention provides a composite reinforcing agent, which comprises the following preparation raw materials in parts by weight: 15-22 parts of anionic surfactant, 7-14 parts of nonionic surfactant, 3-5 parts of stabilizer and 59-75 parts of water. The composite reinforcing agent provided by the invention adopts a compounding system of an anionic surfactant and a nonionic surfactant, is added into the recycled concrete pavement brick, can reduce the surface tension of a cement adhesive material and a recycled aggregate, and reduce the water-adhesive ratio of the pavement brick, and can enable the brick body to be more compact due to the lubricating action when the pavement brick is vibrated and pressurized for molding, so that the strength of the brick is improved, and the composite reinforcing agent is more favorable for molding and demolding of the pavement brick. In the invention, the stabilizer can avoid the precipitation and agglomeration of the anionic surfactant and the nonionic surfactant, maintain the stability of the composite reinforcing agent component, reduce the surface tension and improve the strength and quality stability of the recycled concrete pavement brick. The composite reinforcing agent can be used for preparing the recycled concrete pavement brick, the consumption of cement glue materials can be reduced under the condition of achieving the same strength, and the strength and the quality stability of the pavement brick can be obviously improved under the condition of achieving the same cement consumption.
In addition, the composite reinforcing agent provided by the application has low cost of raw materials and preparation, the cost of each kilogram is only 2 yuan, the addition amount of the composite reinforcing agent in the pavement brick is only 0.1-0.3%, the additional cost is low, and the composite reinforcing agent is suitable for popularization and application.
Detailed Description
The invention provides a composite reinforcing agent, which comprises the following preparation raw materials in parts by weight:
15-22 parts of anionic surfactant, 7-14 parts of nonionic surfactant, 3-5 parts of stabilizer and 59-75 parts of water.
In the present invention, all the starting materials for the preparation are commercially available products well known to those skilled in the art, unless otherwise specified.
In the invention, the raw material for preparing the composite reinforcing agent comprises 15 to 22 parts by weight of anionic surfactant, preferably 18 to 20 parts by weight, and more preferably 19 parts by weight. In the present invention, the anionic surfactant preferably includes sodium dodecylbenzenesulfonate and sodium fatty alcohol-polyoxyethylene ether sulfate; the mass ratio of the sodium dodecyl benzene sulfonate to the sodium fatty alcohol-polyoxyethylene ether sulfate is preferably 9-12: 6 to 10, more preferably 12. In the present invention, the sodium dodecylbenzenesulfonate is preferably of a straight-chain structure type.
In the invention, the raw materials for preparing the composite reinforcing agent comprise 7 to 14 parts of nonionic surfactant, preferably 8 to 10 parts of anionic surfactant. In the present invention, the nonionic surfactant preferably includes fatty alcohol polyoxyethylene ether and coconut oil fatty acid diethanolamide; the mass ratio of the fatty alcohol-polyoxyethylene ether to the coconut oil fatty acid diethanolamide is preferably 5-10: 2 to 4, more preferably 8:4.
In the invention, the raw material for preparing the composite reinforcing agent comprises 3 to 5 parts of stabilizer, preferably 4 to 5 parts of stabilizer based on the weight parts of the anionic surfactant. In the present invention, the stabilizer is preferably a betaine-type amphoteric surfactant. In the present invention, the betaine-type amphoteric surfactant preferably includes alkyl betaine, alkylamide betaine, alkylsulfobetaine or alkylamide hydroxysultaine, more preferably alkylamide betaine. In the present invention, the alkylamidobetaine is preferably an amidopropyl betaine having an alkyl carbon chain length of C10-C18, more preferably lauramidopropyl betaine or cocamidopropyl betaine.
In the invention, the raw materials for preparing the composite reinforcing agent comprise 59-75 parts of water, preferably 63 parts of water based on the weight part of the anionic surfactant. In the present invention, the water is preferably deionized water.
The invention also provides a preparation method of the composite reinforcing agent in the technical scheme, which comprises the following steps:
mixing anionic surfactant, nonionic surfactant, stabilizer and water to obtain the composite reinforcing agent.
In the present invention, the temperature of the mixing is preferably 50 ℃, the mixing is preferably performed under stirring conditions, and the stirring rate is preferably 300r/min. In the present invention, the order of addition at the time of mixing is preferably: adding an anionic surfactant, a nonionic surfactant and a stabilizer into water in sequence.
In a specific embodiment of the present invention, the preparation method of the composite reinforcing agent comprises: adding water into a container, controlling the rotating speed of a homogenizer to be 300r/min, heating in a water bath to 50 ℃, adding sodium dodecyl benzene sulfonate, stirring until the sodium dodecyl benzene sulfonate is completely dissolved, then sequentially adding sodium fatty alcohol-polyoxyethylene ether sulfate, a nonionic surfactant and a stabilizer, homogenizing, and cooling to obtain the composite reinforcing agent.
The preparation method provided by the invention is simple and easy to operate, and the preparation cost is lower.
The invention also provides application of the composite reinforcing agent in the technical scheme or the composite reinforcing agent prepared by the preparation method in the technical scheme in preparation of recycled concrete pavement bricks. The invention reduces the water consumption, improves the compactness of the pavement brick and solves the problems of low strength, poor stability and large cement glue material consumption of the recycled concrete pavement brick by the high surface activity, adsorption and lubrication of the composite reinforcing agent, and is used for preparing the recycled concrete pavement brick with high strength and good stability.
In the invention, the mass content of the composite reinforcing agent in the recycled concrete pavement brick is preferably 0.1-0.3%. The invention can effectively improve the strength and the quality stability of the recycled concrete pavement brick only by adding a very small amount of composite reinforcing agent, and reduce the dosage of cement glue materials under the condition of achieving the same strength.
The invention also provides a preparation method of the recycled concrete pavement brick, which comprises the following steps:
mixing cement, recycled aggregate, a reinforcing agent and water to obtain a bottom material; the reinforcing agent is the composite reinforcing agent prepared by the preparation method of the technical scheme or the composite reinforcing agent prepared by the preparation method of the technical scheme;
mixing cement, river sand and water to obtain a fabric;
sequentially laying a bottom material and a surface material, and vibrating, pressurizing and forming to obtain a green brick;
and maintaining the green brick to obtain the recycled concrete pavement brick.
The invention mixes cement, recycled aggregate, reinforcing agent and water to obtain the backing material. In the present invention, the cement is preferably PO42.5 cement. In the present invention, the recycled aggregate preferably includes recycled fine aggregate and recycled aggregate; the particle size of the recycled fine aggregate is preferably less than 5mm, and the modulus is preferably 2.8; the particle size of the aggregate in regeneration is preferably more than 5mm and less than or equal to 10mm. In the present invention, the reinforcing agent is the composite reinforcing agent described in the above technical scheme or the composite reinforcing agent prepared by the preparation method described in the above technical scheme, and details are not repeated here.
In the present invention, the mass ratio of the cement, the recycled aggregate, and the water is preferably 1:4 to 10, more preferably 1:4 to 6:0.15 to 0.28; the mass ratio of the recycled fine aggregate to the recycled aggregate is preferably 4:1-1:1, more preferably 13:7. in the present invention, the mass of the enhancer is preferably 1 to 2%, more preferably 1.5% of the mass of water.
In the present invention, the mixing of the cement, recycled aggregate, reinforcing agent and water preferably comprises: premixing cement and recycled aggregate to obtain dry materials; mixing an enhancer with water to obtain an enhancer solution; and stirring and mixing the reinforcing agent solution and the dry materials. In the present invention, the time of the premixing is preferably 30s; the time for the stirring and mixing is preferably 150 seconds.
The invention mixes cement, river sand and water to obtain the fabric. In the present invention, the cement is preferably PO42.5 cement. In the present invention, the river sand preferably has a particle size of 40 to 60 mesh. In the present invention, the mass ratio of the cement to the river sand is preferably 1:4 to 5, more preferably 1:4. in the present invention, the water content in the fabric is preferably 5wt%. In the specific embodiment of the invention, the cement and the river sand are premixed for 30s, and water is added to stir for 150s, so that the fabric is obtained.
After the bottom material and the surface material are obtained, the bottom material and the surface material are sequentially paved, and the brick blank is obtained through vibration and pressurization forming. In the present invention, it is preferable that the bed charge is transferred to a bed charge hopper of the block machine, the face material is transferred to a face material hopper of the block machine, and then the bed charge and the face material are sequentially laid in the block machine. In the present invention, the block forming machine is preferably a Haas block forming machine RH2000-4.
In the present invention, the thickness of the primer is preferably 52 to 55mm; the thickness of the fabric is preferably 5 to 8mm, and more preferably 5mm. In the present invention, the rotational speed of the vibrator for the vibration press molding is preferably 2800rpm, the vibration force is preferably 70kN, and the vibration time is preferably 3s.
After the green bricks are obtained, the invention maintains the green bricks to obtain the recycled concrete pavement bricks. In the present invention, the curing preferably includes a first curing and a second curing performed in this order. In the present invention, the first curing is preferably performed in a curing kiln; the first curing temperature is preferably 25-30 ℃; the relative humidity of the first curing is preferably 90% or more; the time period of the first curing is preferably 1 day. In the present invention, the second curing is preferably performed in a standard curing room; the temperature of the second curing is preferably 18-22 ℃; the relative humidity of the second curing is preferably greater than 95%; the time for the second curing is preferably 27 days.
In the present invention, the dimensions of the recycled concrete pavement bricks are preferably 600mm × 300mm × 60mm.
The technical solution of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
The composite reinforcing agent provided by the embodiment is composed of the following preparation raw materials in parts by weight: 12 parts of sodium dodecyl benzene sulfonate, 8 parts of fatty alcohol-polyoxyethylene ether sodium sulfate, 8 parts of fatty alcohol-polyoxyethylene ether, 4 parts of coconut oil fatty acid diethanolamide, 5 parts of laurylamidopropyl betaine and 63 parts of deionized water.
Adding water into a container, controlling the rotating speed of a homogenizer to be 300r/min, heating in a water bath to 50 ℃, adding sodium dodecyl benzene sulfonate, stirring until the sodium dodecyl benzene sulfonate is completely dissolved, then sequentially adding sodium fatty alcohol-polyoxyethylene ether sulfate, fatty alcohol-polyoxyethylene ether, cocoanut oil fatty acid diethanolamide and lauramidopropyl betaine, homogenizing, and cooling to obtain the composite reinforcing agent.
Application example 1
Production equipment of recycled concrete pavement bricks: hais block forming machine RH2000-4, size of recycled concrete pavement brick: 600mm by 300mm by 60mm.
Adding 300kg of PO42.5 cement, 1300kg of recycled fine aggregate (modulus 2.8) and 700kg of recycled aggregate into a stirrer for premixing for 30s to obtain dry materials; mixing 15kg of the composite reinforcing agent prepared in example 1 with 1000kg of water to obtain a reinforcing agent solution; stirring the dry material and the reinforcing agent solution for 150s to obtain a bottom material; transferring the bottom materials to a bottom material hopper of a block forming machine;
adding 250kg of PO42.5 cement and 1000kg of river sand into a stirrer for premixing for 30s, adding water and stirring for 150s to obtain a fabric, wherein the water content of the fabric is 5wt%; transferring the fabric to a fabric hopper of a block forming machine;
paving a bottom material and then a fabric, wherein the thickness of the bottom material is 55mm, and the thickness of the fabric is 5mm, and performing vibration and pressurization molding; the rotating speed of a vibration pressurizing and forming vibrator is 2800rpm, the vibration force is 70kN, and the vibration time is 3s, so that green bricks are obtained;
and curing the green brick in a curing kiln (the temperature is 25-30 ℃ and the relative humidity is more than 90%) for 1 day, and then transferring the green brick to a standard curing room (the temperature is 20 ℃ and the relative humidity is more than 95%) for curing to 28 days to obtain the recycled concrete pavement brick.
Application example 2
The method is basically the same as the application example 1, except that: the amount of cement used in the base material was adjusted to 400kg.
Comparative example 1
The same as application example 1, except that: no composite reinforcing agent is added.
Comparative example 2
Basically the same as application example 2, except that: no complex reinforcing agent is added.
Test example 1
According to the 28-day compressive strength of GB 28635-2012 concrete pavement bricks of application examples 1-2 and comparative examples 1-2, 10 blocks of the recycled concrete pavement bricks are randomly selected for the compressive strength test respectively, and the compressive strength test is performed as shown in Table 1.
TABLE 1 Strength of recycled concrete paviours tiles prepared in application examples 1-2 and comparative examples 1-2
Example 2
The composite reinforcing agent provided by the embodiment is composed of the following preparation raw materials in parts by weight: 10 parts of sodium dodecyl benzene sulfonate, 10 parts of fatty alcohol-polyoxyethylene ether sodium sulfate, 10 parts of fatty alcohol-polyoxyethylene ether, 2 parts of coconut diethanolamide, 3 parts of cocamidopropyl betaine and 65 parts of deionized water.
Adding water into a container, controlling the rotation speed of a homogenizer to be 300r/min, heating in a water bath to 50 ℃, adding sodium dodecyl benzene sulfonate, stirring until the sodium dodecyl benzene sulfonate is completely dissolved, then sequentially adding sodium fatty alcohol-polyoxyethylene ether sulfate, fatty alcohol-polyoxyethylene ether, cocoanut fatty acid diethanolamide and cocamidopropyl betaine, homogenizing and cooling to obtain the composite reinforcing agent.
Application example 3
Production equipment of recycled concrete pavement bricks: hais block forming machine RH2000-4, recycled concrete pavement brick size: 600 mm. Times.300 mm. Times.60 mm.
Adding 300kg of PO42.5 cement, 1300kg of recycled fine aggregate (modulus of 2.8) and 700kg of recycled aggregate into a stirrer for premixing for 30s to obtain dry materials; mixing 15kg of the composite reinforcing agent prepared in example 2 with 1000kg of water to obtain a reinforcing agent solution; stirring the dry material and the reinforcing agent solution for 150s to obtain a bottom material; transferring the bottom materials to a bottom material hopper of a block forming machine;
adding 250kg of PO42.5 cement and 1000kg of river sand into a stirrer for premixing for 30s, adding water and stirring for 150s to obtain a fabric, wherein the water content of the fabric is 5wt%; transferring the fabric to a fabric hopper of a block forming machine;
paving a backing material and then paving a fabric, wherein the thickness of the backing material is 55mm, and the thickness of the fabric is 5mm, and performing vibration and pressurization molding; the rotating speed of a vibration pressurizing and forming vibrator is 2800rpm, the vibration force is 70kN, and the vibration time is 3s, so that green bricks are obtained;
and curing the green brick in a curing kiln (the temperature is 25-30 ℃ and the relative humidity is more than 90%) for 1 day, and then transferring the green brick to a standard curing room (the temperature is 20 ℃ and the relative humidity is more than 95%) for curing to 28 days to obtain the recycled concrete pavement brick.
Application example 4
The method is basically the same as the application example 3, except that: the amount of cement used in the base material was adjusted to 400kg.
Comparative example 3
The method is basically the same as the application example 3, except that: no complex reinforcing agent is added.
Comparative example 4
Basically the same as application example 4, except that: no complex reinforcing agent is added.
Test example 2
According to the 28-day compressive strength of the recycled concrete pavement bricks prepared in GB 28635-2012 concrete pavement bricks in application examples 3-4 and comparative examples 3-4, 10 recycled concrete pavement bricks are randomly selected respectively for carrying out the compressive strength test, and the compressive strength test is shown in Table 2.
TABLE 2 Strength of recycled concrete paviours tiles prepared in application examples 3 to 4 and comparative examples 3 to 4
Example 3
The composite reinforcing agent provided by the embodiment is composed of the following preparation raw materials in parts by weight: 12 parts of sodium dodecyl benzene sulfonate, 8 parts of fatty alcohol-polyoxyethylene ether sodium sulfate, 9 parts of fatty alcohol-polyoxyethylene ether, 3 parts of coconut oil fatty acid diethanolamide, 4 parts of cocamidopropyl betaine and 64 parts of deionized water.
Adding water into a container, controlling the rotation speed of a homogenizer to be 300r/min, heating in a water bath to 50 ℃, adding sodium dodecyl benzene sulfonate, stirring until the sodium dodecyl benzene sulfonate is completely dissolved, then sequentially adding sodium fatty alcohol-polyoxyethylene ether sulfate, fatty alcohol-polyoxyethylene ether, cocoanut fatty acid diethanolamide and cocamidopropyl betaine, homogenizing and cooling to obtain the composite reinforcing agent.
Application example 5
Production equipment of recycled concrete pavement bricks: hais block forming machine RH2000-4, size of recycled concrete pavement brick: 600 mm. Times.300 mm. Times.60 mm.
Adding 300kg of PO42.5 cement, 1300kg of recycled fine aggregate (modulus 2.8) and 700kg of recycled aggregate into a stirrer for premixing for 30s to obtain dry materials; mixing 15kg of the composite reinforcing agent prepared in example 3 with 1000kg of water to obtain a reinforcing agent solution; stirring the dry material and the reinforcing agent solution for 150s to obtain a bottom material; transferring the bottom materials to a bottom material hopper of a block forming machine;
adding 250kg of PO42.5 cement and 1000kg of river sand into a stirrer for premixing for 30s, adding water and stirring for 150s to obtain a fabric, wherein the water content of the fabric is 5wt%; transferring the fabric to a fabric hopper of a block forming machine;
paving a bottom material and then a fabric, wherein the thickness of the bottom material is 55mm, and the thickness of the fabric is 5mm, and performing vibration and pressurization molding; the rotating speed of a vibration pressurizing and forming vibrator is 2800rpm, the vibration force is 70kN, and the vibration time is 3s, so that green bricks are obtained;
and curing the green brick in a curing kiln (the temperature is 25-30 ℃, and the relative humidity is more than 90%) for 1 day, and then transferring the green brick to a standard curing room (the temperature is 20 ℃, and the relative humidity is more than 95%) for curing to 28 days to obtain the recycled concrete pavement brick.
Application example 6
The same as in application example 5, except that: the amount of cement used in the bed charge was adjusted to 400kg.
Comparative example 5
The same as in application example 5, except that: no complex reinforcing agent is added.
Comparative example 6
The same as in application example 6, except that: no complex reinforcing agent is added.
Test example 3
According to the 28-day compressive strength of the recycled concrete pavement bricks prepared in GB 28635-2012 concrete pavement bricks in application examples 5-6 and comparative examples 5-6, 10 recycled concrete pavement bricks are randomly selected respectively for carrying out a compressive strength test, and the compressive strength test is shown in Table 3.
TABLE 3 Strength of recycled concrete pavior tiles prepared in application examples 5 to 6 and comparative examples 5 to 6
As can be seen from tables 1-3, under the condition of the same cement dosage, the composite reinforcing agent of the invention can obviously improve the strength and the quality stability of the pavement brick.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (6)
1. The application of a composite reinforcing agent in preparing recycled concrete pavement bricks comprises the following preparation raw materials in parts by weight:
15-22 parts of anionic surfactant, 7-14 parts of nonionic surfactant, 8978 parts of stabilizer 3~5 parts of water, and 59-75 parts of water;
the anionic surfactant comprises sodium dodecyl benzene sulfonate and fatty alcohol-polyoxyethylene ether sodium sulfate; the mass ratio of the sodium dodecyl benzene sulfonate to the sodium fatty alcohol polyoxyethylene ether sulfate is (9) - (12): 6 to 10;
the nonionic surfactant comprises fatty alcohol-polyoxyethylene ether and coconut oil fatty acid diethanolamide; the mass ratio of the fatty alcohol-polyoxyethylene ether to the coconut oil fatty acid diethanolamide is 5 to 10:2~4;
the stabilizer is a betaine amphoteric surfactant.
2. Use according to claim 1, characterized in that the betaine-type amphoteric surfactant comprises an alkyl betaine, an alkylamide betaine, an alkyl sulphobetaine or an alkylamide hydroxysulphobetaine.
3. The use of any one of claims 1~2 wherein the method of making the composite reinforcement agent comprises the steps of:
mixing anionic surfactant, nonionic surfactant, stabilizer and water to obtain the composite reinforcing agent.
4. The application of the recycled concrete pavement brick as claimed in claim 1, wherein the mass content of the composite reinforcing agent in the recycled concrete pavement brick is 0.1-0.3%.
5. The preparation method of the recycled concrete pavement brick is characterized by comprising the following steps of:
mixing cement, recycled aggregate, a composite reinforcing agent and water to obtain a backing material; the composite reinforcing agent is the composite reinforcing agent used in the application of any one of claims 1~4;
mixing cement, river sand and water to obtain a fabric;
sequentially laying a bottom material and a surface material, and performing vibration and pressure molding to obtain a green brick;
and maintaining the green brick to obtain the recycled concrete pavement brick.
6. The preparation method of claim 5, wherein the thickness of the fabric is 5 to 8mm.
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