CN112608074A - Antibacterial asphalt concrete and preparation method thereof - Google Patents
Antibacterial asphalt concrete and preparation method thereof Download PDFInfo
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- CN112608074A CN112608074A CN202110057202.XA CN202110057202A CN112608074A CN 112608074 A CN112608074 A CN 112608074A CN 202110057202 A CN202110057202 A CN 202110057202A CN 112608074 A CN112608074 A CN 112608074A
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- C—CHEMISTRY; METALLURGY
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- C04B26/00—Compositions of mortars, concrete or artificial stone, containing only organic binders, e.g. polymer or resin concrete
- C04B26/02—Macromolecular compounds
- C04B26/26—Bituminous materials, e.g. tar, pitch
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- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/02—Agglomerated materials, e.g. artificial aggregates
- C04B18/021—Agglomerated materials, e.g. artificial aggregates agglomerated by a mineral binder, e.g. cement
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- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/10—Coating or impregnating
- C04B20/1055—Coating or impregnating with inorganic materials
- C04B20/1066—Oxides, Hydroxides
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- 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
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- 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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- C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
- C04B2103/60—Agents for protection against chemical, physical or biological attack
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- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/0075—Uses not provided for elsewhere in C04B2111/00 for road construction
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- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/20—Resistance against chemical, physical or biological attack
- C04B2111/2038—Resistance against physical degradation
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- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/20—Resistance against chemical, physical or biological attack
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- C04B2111/2061—Materials containing photocatalysts, e.g. TiO2, for avoiding staining by air pollutants or the like
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- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
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Abstract
The invention relates to an antibacterial asphalt concrete and a preparation method thereof, wherein the antibacterial asphalt concrete comprises the following raw materials in parts by weight: 5.5-11 parts of asphalt, 38-50 parts of quartz sand, 95-165 parts of coarse aggregate, 3.5-7 parts of mineral powder and 0.015-0.054 part of an antibacterial agent. According to the invention, the artificial coarse aggregate is used for replacing part of natural coarse aggregate, so that the natural coarse aggregate is saved, and the light receiving area of the antibacterial agent is obviously increased; the antibacterial agent is respectively dispersed on the surface of the coarse aggregate, the mineral powder and the asphalt, so that the dispersibility of the antibacterial agent in the asphalt concrete is improved, the exposure quantity of the reactive active sites is ensured, and the aim of effective antibacterial is fulfilled.
Description
Technical Field
The invention belongs to the technical field of building materials, and particularly relates to antibacterial asphalt concrete and a preparation method thereof.
Background
The asphalt concrete is a mixture prepared by mixing asphalt, aggregate and the like. Asphalt concrete is exposed to air for a long time, and a large amount of bacteria are easily accumulated in the surface layer or the gaps of the asphalt concrete. The metabolite of the bacteria has an erosion effect on the aggregate, so that the strength of the aggregate is reduced, the stripping of the asphalt and the aggregate is accelerated, and the service life of the asphalt concrete is shortened. At present, in order to prevent the corrosion damage of bacteria to the asphalt concrete structure, the existing solutions are spraying a bactericide, coating a bactericidal coating, photocatalytic sterilization and the like. The photocatalytic sterilization effect is influenced by the properties of the nano photocatalytic material, the contact area with a light source, the composite effect among different materials and other factors. The above solutions all have the following problems in practical application:
(1) the improvement of the contact area of the nano photocatalytic material and bacteria or the light receiving area of the nano photocatalytic material in the asphalt concrete is hindered by only adopting natural coarse aggregate or only doping the nano photocatalytic material in the asphalt, so that the improvement of the sterilization performance is limited. And the nano photocatalytic material directly doped in the asphalt concrete is difficult to expose after being wrapped by asphalt, so that the photocatalytic performance is poor.
(2) The asphalt concrete is mainly applied to the fields of pavement and bridge deck pavement, is exposed in the external environment for a long time, and is repeatedly rolled by wheels. If the bactericidal coating is directly coated on the surface of the asphalt concrete, the bactericidal coating is easy to damage or peel off from the surface of the asphalt concrete, and the service life is short. After the film is broken or peeled off, although the film can be repeatedly applied and repaired, resources such as manpower and materials are continuously input, and the maintenance cost is high.
(3) The common bactericide is a chemical preparation, and the bactericide is sprayed on the surface of the asphalt concrete, so that the adhesiveness of asphalt and aggregate can be influenced, and the service life of the asphalt concrete can be influenced.
(4) Due to the factors of easy adsorption and agglomeration of the nano photocatalytic material, the viscosity of asphalt and the like, the nano photocatalytic material is difficult to be directly mixed with the asphalt or the sandstone for uniform mixing, so that the photocatalytic performance is poor, and the sterilization effect in the use process is influenced. Therefore, in order to reduce the corrosion damage of bacteria to the asphalt concrete structure and prolong the service life of the asphalt concrete, the design of the antibacterial asphalt concrete and the preparation method thereof become more important.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides the antibacterial asphalt concrete and the preparation method thereof, which not only saves natural coarse aggregate, but also obviously improves the light receiving area of the nano photocatalytic material in the asphalt concrete, and ensures the high efficiency and stability of the antibacterial property of the asphalt concrete.
In order to achieve the purpose, the invention adopts the following technical scheme:
the antibacterial asphalt concrete comprises the following raw materials in parts by weight: 5.5-11 parts of asphalt, 38-50 parts of quartz sand, 95-165 parts of coarse aggregate, 3.5-7 parts of mineral powder and 0.015-0.054 part of an antibacterial agent; the antibacterial agent consists of an antibacterial main material and an antibacterial auxiliary material; the antibacterial main material is the mass combination of nano titanium dioxide, nano graphite phase carbon nitride, nano zirconium dioxide and the like; the antibacterial auxiliary material is nano hexagonal boron nitride; the weight ratio of the antibacterial main material to the antibacterial auxiliary material is 1: 0.15-0.2.
The coarse aggregate is formed by mixing natural coarse aggregate and artificial coarse aggregate; the coarse aggregate is prepared by mixing the following steps:
the method comprises the following steps: screening the natural coarse aggregate and the artificial coarse aggregate to respectively obtain the natural coarse aggregate and the artificial coarse aggregate with the grain sizes of (4.75 mm, 16 mm) and (16 mm, 26.5 mm);
step two: the method comprises the steps of weighing natural coarse aggregates and artificial coarse aggregates respectively according to the weight ratio of 1: 0.1-0.3 of the natural coarse aggregates and the artificial coarse aggregates in a range with the particle size of 4.75mm to 16mm, uniformly mixing to obtain first range coarse aggregates, weighing the natural coarse aggregates and the artificial coarse aggregates respectively according to the weight ratio of 1: 0.05-0.25 of the natural coarse aggregates and the artificial coarse aggregates in a range with the particle size of 16mm to 26.5mm, uniformly mixing to obtain second range coarse aggregates, putting the first range coarse aggregates and the second range coarse aggregates into a stirrer, uniformly mixing and stirring to obtain coarse aggregates, wherein the composition ratio of the first range coarse aggregates to the second range coarse aggregates in parts by weight is 1: 0.6-1.
The natural coarse aggregate is basalt macadam; the artificial coarse aggregate comprises the following raw materials in parts by weight: 16-25 parts of cement, 0.9-2.5 parts of metakaolin, 45-75 parts of quartz sand, 0.15-0.2 part of basalt fiber, 0.025-0.05 part of antibacterial agent and 8-14.5 parts of deionized water.
The preparation method of the antibacterial asphalt concrete comprises the following steps:
the method comprises the following steps: simultaneously adding the antibacterial main material and the antibacterial auxiliary material into tap water with the volume of 12-25 minutes, carrying out ultrasonic dispersion, filtering to remove tap water, and then carrying out ball milling for 1.5-3.5 hours by using a ball mill to obtain an antibacterial agent; whereinV 1=(50~300)V 2WhereinV 2Is the sum of the accumulation volume of the antibacterial main material and the accumulation volume of the antibacterial auxiliary material;
step two: dividing the antibacterial agent into three parts by weight, and recording as a first antibacterial agent, a second antibacterial agent and a third antibacterial agent;
step three: adding the first part of antibacterial agent into tap water with the volume of the first part, and uniformly stirring and dispersing to obtain lubricating membrane liquid; placing the coarse aggregate into a stirrer, spraying a lubricating film liquid while stirring, continuing stirring for 1.5-3 minutes after the lubricating film liquid is sprayed, pouring the coarse aggregate into a tray, placing the tray in an oven at 80-120 ℃ and heating for 2.5-4 hours to enable the antibacterial agent to be attached to the surface of the coarse aggregate, and obtaining the film-attached coarse aggregate;
step four: stirring the second part of antibacterial agent and the mineral powder for 3-5 minutes to obtain a mixture A; mixing and stirring the third antibacterial agent and the asphalt particles for 2-4 minutes to obtain a mixture B; the asphalt particles are particles obtained by crushing blocky asphalt into particles with the particle size not larger than 12 mm;
step five: heating the quartz sand, the film-attached coarse aggregate and the mixture A in an oven at 160-180 ℃ for 120-240 minutes; placing the mixture B in an oven, heating for 120-180 minutes, then manually stirring for 10-20 times, and continuing heating until the mixture B is completely melted;
step six: and (3) preheating the stirrer, sequentially adding the heated membrane-attached coarse aggregate and quartz sand into the stirrer, stirring for 35-60 seconds, then adding the melted mixture B, stirring for 55-80 seconds, then adding the heated mixture A, and stirring for 120-150 seconds to obtain the antibacterial asphalt concrete.
Manual stirring is that handheld stirring rod extends to the bottom of holding mixture B container, and clockwise stirring 5~10 times earlier, then anticlockwise stirring 5~10 times.
The preheating temperature of the stirrer is 160-180 ℃.
The above-mentionedV 3=(0.25~0.5)V 4，V 4Is the bulk of the coarse aggregate.
Compared with the prior art, the invention has the beneficial effects that:
1. the artificial coarse aggregate is adopted to replace part of the natural coarse aggregate, so that the natural coarse aggregate can be saved, the light receiving area of the antibacterial agent in the asphalt concrete is obviously increased, the anti-scouring and anti-wear performance of the antibacterial agent in the asphalt concrete is better, and the stability of the antibacterial performance of the asphalt concrete is ensured.
2. The nano photocatalytic material is adopted as an antibacterial agent to be doped into the asphalt concrete, so that the durability of the asphalt concrete is not influenced, and the nano photocatalytic material can play an antibacterial role for a long time; different nano photocatalytic materials are selected as the antibacterial main materials for ensuring the stability of the antibacterial effect; meanwhile, under the cooperation of the antibacterial auxiliary materials, the uniform dispersion of the antibacterial main materials in the asphalt concrete is improved, more reactive sites can be effectively exposed, and the antibacterial effect of the asphalt concrete is obviously improved.
3. The antibacterial agent is attached to the surface of the coarse aggregate, dispersed in the asphalt and the mineral powder and then mixed to prepare the antibacterial asphalt concrete, so that the uneven dispersion caused by single-mode doping is reduced, the dispersibility of the antibacterial agent in the asphalt concrete is improved, and the exposure number of reactive active sites is ensured. The antibacterial agent is attached to the surface of the coarse aggregate, so that good antibacterial and sterilization effects on bacteria on a contact interface of the asphalt and the coarse aggregate are facilitated.
Detailed Description
The invention provides an antibacterial asphalt concrete and a preparation method thereof. In order to further explain the technical means and effects of the present invention, the following detailed description of the present invention is provided in conjunction with the embodiments.
The antibacterial asphalt concrete comprises the following raw materials in parts by weight: 5.5-11 parts of asphalt, 38-50 parts of quartz sand, 95-165 parts of coarse aggregate, 3.5-7 parts of mineral powder and 0.015-0.054 part of an antibacterial agent; the antibacterial agent consists of an antibacterial main material and an antibacterial auxiliary material; the antibacterial main material is the mass combination of nano titanium dioxide, nano graphite phase carbon nitride, nano zirconium dioxide and the like; the antibacterial auxiliary material is nano hexagonal boron nitride; the weight ratio of the antibacterial main material to the antibacterial auxiliary material is 1: 0.15-0.2.
The coarse aggregate is formed by mixing natural coarse aggregate and artificial coarse aggregate; the coarse aggregate is prepared by mixing the following steps:
the method comprises the following steps: screening the natural coarse aggregate and the artificial coarse aggregate to respectively obtain the natural coarse aggregate and the artificial coarse aggregate with the grain sizes of (4.75 mm, 16 mm) and (16 mm, 26.5 mm);
step two: the method comprises the steps of weighing natural coarse aggregates and artificial coarse aggregates respectively according to the weight ratio of 1: 0.1-0.3 of the natural coarse aggregates and the artificial coarse aggregates in a range with the particle size of 4.75mm to 16mm, uniformly mixing to obtain first range coarse aggregates, weighing the natural coarse aggregates and the artificial coarse aggregates respectively according to the weight ratio of 1: 0.05-0.25 of the natural coarse aggregates and the artificial coarse aggregates in a range with the particle size of 16mm to 26.5mm, uniformly mixing to obtain second range coarse aggregates, putting the first range coarse aggregates and the second range coarse aggregates into a stirrer, uniformly mixing and stirring to obtain coarse aggregates, wherein the composition ratio of the first range coarse aggregates to the second range coarse aggregates in parts by weight is 1: 0.6-1.
The natural coarse aggregate is basalt macadam; the artificial coarse aggregate comprises the following raw materials in parts by weight: 16-25 parts of cement, 0.9-2.5 parts of metakaolin, 45-75 parts of quartz sand, 0.15-0.2 part of basalt fiber, 0.025-0.05 part of antibacterial agent and 8-14.5 parts of deionized water.
The preparation method of the antibacterial asphalt concrete comprises the following steps:
the method comprises the following steps: simultaneously adding the antibacterial main material and the antibacterial auxiliary material into tap water with the volume of 12-25 minutes, carrying out ultrasonic dispersion, filtering to remove tap water, and then carrying out ball milling for 1.5-3.5 hours by using a ball mill to obtain an antibacterial agent; whereinV 1=(50~300)V 2WhereinV 2Is the sum of the accumulation volume of the antibacterial main material and the accumulation volume of the antibacterial auxiliary material;
step two: dividing the antibacterial agent into three parts by weight, and recording as a first antibacterial agent, a second antibacterial agent and a third antibacterial agent;
step three: adding the first part of antibacterial agent into tap water with the volume of the first part, and uniformly stirring and dispersing to obtain lubricating membrane liquid; placing the coarse aggregate into a stirrer, spraying a lubricating film liquid while stirring, continuing stirring for 1.5-3 minutes after the lubricating film liquid is sprayed, pouring the coarse aggregate into a tray, placing the tray in an oven at 80-120 ℃ and heating for 2.5-4 hours to enable the antibacterial agent to be attached to the surface of the coarse aggregate, and obtaining the film-attached coarse aggregate;
step four: stirring the second part of antibacterial agent and the mineral powder for 3-5 minutes to obtain a mixture A; mixing and stirring the third antibacterial agent and the asphalt particles for 2-4 minutes to obtain a mixture B; the asphalt particles are particles obtained by crushing blocky asphalt into particles with the particle size not larger than 12 mm;
step five: heating the quartz sand, the film-attached coarse aggregate and the mixture A in an oven at 160-180 ℃ for 120-240 minutes; placing the mixture B in an oven, heating for 120-180 minutes, then manually stirring for 10-20 times, and continuing heating until the mixture B is completely melted;
step six: and (3) preheating the stirrer, sequentially adding the heated membrane-attached coarse aggregate and quartz sand into the stirrer, stirring for 35-60 seconds, then adding the melted mixture B, stirring for 55-80 seconds, then adding the heated mixture A, and stirring for 120-150 seconds to obtain the antibacterial asphalt concrete.
Manual stirring is that handheld stirring rod extends to the bottom of holding mixture B container, and clockwise stirring 5~10 times earlier, then anticlockwise stirring 5~10 times.
The preheating temperature of the stirrer is 160-180 ℃.
The above-mentionedV 3=(0.25~0.5)V 4，V 4Is the bulk of the coarse aggregate.
The particle size of the quartz sand is 0.25-3 mm; the particle size of the nano calcium carbonate is 30-100 nm; the temperature of the tap water is 22-28 ℃.
When in useV 3When the coarse aggregate is taken to be 0.25-0.5 times of the stacking volume, the dispersion and the attachment of the antibacterial agent are facilitated, the heating and drying time can be shortened, and the stirring uniformity of the coarse aggregate in the lubricating film liquid is not influenced.
The density of the basalt fiber is 2.62 g/cm3The water content is 0.2%, and the nominal diameter is 5-15 microns; the length of the basalt fiber is 0.5-0.8 time of the particle size of the artificial coarse aggregate.
The artificial coarse aggregate is prepared by mixing and stirring an antibacterial agent, cement, quartz sand, metakaolin and basalt fiber uniformly, adding deionized water, stirring to prepare antibacterial cement mortar, then sequentially vibrating, extruding and cutting the photocatalytic cement mortar to obtain a bone blank, and maintaining the bone blank for 28 days in an environment with the temperature of 22-26 ℃ and the humidity of 85-92% to obtain the artificial coarse aggregate. The shape of the artificial coarse aggregate is a pentagonal prism or a hexagonal prism.
The vibration is to adopt a vibration table to vibrate and compact the antibacterial cement mortar; the extrusion molding is to extrude the antibacterial cement mortar after vibration compaction to form strip-shaped mortar through a prismatic mold with a pentagonal prism or a hexagonal prism in cross section shape; the cutting is to cut the strip-shaped mortar into granular bone blanks according to the size of the required artificial coarse aggregate.
The interval of particle size (4.75, 16 mm) means particle size ranging from greater than 4.75mm to no greater than 16 mm.
Example 1:
in the embodiment, the asphalt concrete comprises the following raw materials in parts by weight: 8 parts of asphalt, 40 parts of quartz sand, 150 parts of coarse aggregate, 4 parts of mineral powder and 0.02 part of an antibacterial agent; the antibacterial agent consists of an antibacterial main material and an antibacterial auxiliary material; the antibacterial main material is the mass combination of nano titanium dioxide, nano graphite phase carbon nitride, nano zirconium dioxide and the like; the antibacterial auxiliary material is nano hexagonal boron nitride; the weight ratio of the antibacterial main material to the antibacterial auxiliary material is 1: 0.16. The artificial coarse aggregate comprises the following raw materials in parts by weight: 21 parts of cement, 1.8 parts of metakaolin, 60 parts of quartz sand, 0.16 part of basalt fiber, 0.035 part of antibacterial agent and 11 parts of deionized water, wherein the natural coarse aggregate is basalt broken stone.
In the embodiment, the coarse aggregate is formed by mixing natural coarse aggregate and artificial coarse aggregate; the coarse aggregate is prepared by mixing the following steps:
the method comprises the following steps: screening the natural coarse aggregate and the artificial coarse aggregate to respectively obtain the natural coarse aggregate and the artificial coarse aggregate with the grain sizes of (4.75 mm, 16 mm) and (16 mm, 26.5 mm);
step two: the method comprises the steps of weighing natural coarse aggregates and artificial coarse aggregates respectively according to the weight ratio of 1:0.1 of the natural coarse aggregates and the artificial coarse aggregates in a range with the particle size of (4.75 mm, 16 mm), uniformly mixing to obtain first-range coarse aggregates, weighing the natural coarse aggregates and the artificial coarse aggregates respectively according to the weight ratio of 1:0.05 of the natural coarse aggregates and the artificial coarse aggregates in a range with the particle size of (16 mm, 26.5 mm), uniformly mixing to obtain second-range coarse aggregates, putting the first-range coarse aggregates and the second-range coarse aggregates into a stirrer, uniformly mixing and stirring to obtain coarse aggregates, wherein the composition ratio of the first-range coarse aggregates to the second-range coarse aggregates in parts by weight is 1: 0.8.
In this embodiment, the preparation method of the antibacterial asphalt concrete is performed according to the following steps:
the method comprises the following steps: simultaneously adding the antibacterial main material and the antibacterial auxiliary material into tap water, performing ultrasonic dispersion for 20 minutes, filtering to remove the tap water, and performing ball milling for 2 hours by using a ball mill to obtain an antibacterial agent; wherein the volume of the tap water is 120 times of the sum of the accumulation volume of the antibacterial main material and the accumulation volume of the antibacterial auxiliary material;
step two: dividing the antibacterial agent into three parts by weight, and recording as a first antibacterial agent, a second antibacterial agent and a third antibacterial agent;
step three: adding the first part of antibacterial agent into tap water, and uniformly stirring and dispersing to obtain lubricating membrane liquid; placing the coarse aggregate into a stirrer, spraying a lubricating film liquid while stirring, continuing stirring for 2 minutes after the lubricating film liquid is sprayed, pouring the coarse aggregate into a tray, placing the tray in an oven at 85 ℃, and heating for 2.5 hours to enable the antibacterial agent to be attached to the surface of the coarse aggregate, thereby obtaining the film-attached coarse aggregate; wherein the volume of tap water is 0.3 times of the stacking volume of the coarse aggregate;
step four: stirring the second part of antibacterial agent and the mineral powder for 3 minutes to obtain a mixture A; mixing and stirring the third part of antibacterial agent and the asphalt particles for 2.5 minutes to obtain a mixture B; the asphalt particles are particles obtained by crushing blocky asphalt into particles with the particle size of not more than 12 mm;
step five: heating the quartz sand, the coarse aggregate with the film and the mixture A in an oven at 180 ℃ for 150 minutes; placing the mixture B in an oven, heating for 160 minutes, then manually stirring for 10 times, and continuing heating until the mixture B is completely melted;
step six: preheating a stirrer to 180 ℃, sequentially adding the heated membrane-attached coarse aggregate and quartz sand into the stirrer, stirring for 40 seconds, then adding the melted mixture B, stirring for 60 seconds, then adding the heated mixture A, and stirring for 120 seconds to obtain the antibacterial asphalt concrete.
Example 2:
in the embodiment, the asphalt concrete comprises the following raw materials in parts by weight: 8 parts of asphalt, 40 parts of quartz sand, 150 parts of coarse aggregate, 4 parts of mineral powder and 0.02 part of an antibacterial agent; the antibacterial agent consists of an antibacterial main material and an antibacterial auxiliary material; the antibacterial main material is the mass combination of nano titanium dioxide, nano graphite phase carbon nitride, nano zirconium dioxide and the like; the antibacterial auxiliary material is nano hexagonal boron nitride; the weight ratio of the antibacterial main material to the antibacterial auxiliary material is 1: 0.16. The artificial coarse aggregate comprises the following raw materials in parts by weight: 21 parts of cement, 1.8 parts of metakaolin, 60 parts of quartz sand, 0.16 part of basalt fiber, 0.035 part of antibacterial agent and 11 parts of deionized water, wherein the natural coarse aggregate is basalt broken stone.
In the embodiment, the coarse aggregate is formed by mixing natural coarse aggregate and artificial coarse aggregate; the coarse aggregate is prepared by mixing the following steps:
the method comprises the following steps: screening the natural coarse aggregate and the artificial coarse aggregate to respectively obtain the natural coarse aggregate and the artificial coarse aggregate with the grain sizes of (4.75 mm, 16 mm) and (16 mm, 26.5 mm);
step two: the method comprises the steps of weighing natural coarse aggregates and artificial coarse aggregates respectively according to the weight ratio of 1:0.2 of the natural coarse aggregates and the artificial coarse aggregates in a range with the particle size of (4.75 mm, 16 mm), uniformly mixing to obtain first-range coarse aggregates, weighing the natural coarse aggregates and the artificial coarse aggregates respectively according to the weight ratio of 1:0.15 of the natural coarse aggregates and the artificial coarse aggregates in a range with the particle size of (16 mm, 26.5 mm), uniformly mixing to obtain second-range coarse aggregates, putting the first-range coarse aggregates and the second-range coarse aggregates into a stirrer, uniformly mixing and stirring to obtain coarse aggregates, wherein the composition ratio of the first-range coarse aggregates to the second-range coarse aggregates in parts by weight is 1: 0.8.
The method for producing the antibacterial asphalt concrete of this example is the same as that of example 1.
Example 3:
in the embodiment, the asphalt concrete comprises the following raw materials in parts by weight: 8 parts of asphalt, 40 parts of quartz sand, 150 parts of coarse aggregate, 4 parts of mineral powder and 0.02 part of an antibacterial agent; the antibacterial agent consists of an antibacterial main material and an antibacterial auxiliary material; the antibacterial main material is the mass combination of nano titanium dioxide, nano graphite phase carbon nitride, nano zirconium dioxide and the like; the antibacterial auxiliary material is nano hexagonal boron nitride; the weight ratio of the antibacterial main material to the antibacterial auxiliary material is 1: 0.16. The artificial coarse aggregate comprises the following raw materials in parts by weight: 21 parts of cement, 1.8 parts of metakaolin, 60 parts of quartz sand, 0.16 part of basalt fiber, 0.035 part of antibacterial agent and 11 parts of deionized water, wherein the natural coarse aggregate is basalt broken stone.
In the embodiment, the coarse aggregate is formed by mixing natural coarse aggregate and artificial coarse aggregate; the coarse aggregate is prepared by mixing the following steps:
the method comprises the following steps: screening the natural coarse aggregate and the artificial coarse aggregate to respectively obtain the natural coarse aggregate and the artificial coarse aggregate with the grain sizes of (4.75 mm, 16 mm) and (16 mm, 26.5 mm);
step two: the method comprises the steps of weighing natural coarse aggregates and artificial coarse aggregates respectively according to the weight ratio of 1:0.3 of the natural coarse aggregates and the artificial coarse aggregates in a range with the particle size of (4.75 mm, 16 mm), uniformly mixing to obtain first-range coarse aggregates, weighing the natural coarse aggregates and the artificial coarse aggregates respectively according to the weight ratio of 1:0.25 of the natural coarse aggregates and the artificial coarse aggregates in a range with the particle size of (16 mm, 26.5 mm), uniformly mixing to obtain second-range coarse aggregates, putting the first-range coarse aggregates and the second-range coarse aggregates into a stirrer, uniformly mixing and stirring to obtain coarse aggregates, wherein the composition ratio of the first-range coarse aggregates to the second-range coarse aggregates in parts by weight is 1: 0.8.
The method for producing the antibacterial asphalt concrete of this example is the same as that of example 1.
Comparative example 1: without the incorporation of artificial coarse aggregate
In the comparative example, the asphalt concrete comprises the following raw materials in parts by weight: 8 parts of asphalt, 40 parts of quartz sand, 150 parts of coarse aggregate, 4 parts of mineral powder and 0.02 part of an antibacterial agent; the antibacterial agent consists of an antibacterial main material and an antibacterial auxiliary material; the antibacterial main material is the mass combination of nano titanium dioxide, nano graphite phase carbon nitride, nano zirconium dioxide and the like; the antibacterial auxiliary material is nano hexagonal boron nitride; the weight ratio of the antibacterial main material to the antibacterial auxiliary material is 1:0.16, and the coarse aggregate used in the comparative example is basalt macadam.
The preparation method of the antibacterial asphalt concrete of the comparative example is the same as that of example 1.
Comparative example 2: by incorporating antimicrobial agents in one way
In the comparative example, the asphalt concrete comprises the following raw materials in parts by weight: 8 parts of asphalt, 40 parts of quartz sand, 150 parts of coarse aggregate, 4 parts of mineral powder and 0.02 part of an antibacterial agent; the antibacterial agent consists of an antibacterial main material and an antibacterial auxiliary material; the antibacterial main material is the mass combination of nano titanium dioxide, nano graphite phase carbon nitride, nano zirconium dioxide and the like; the antibacterial auxiliary material is nano hexagonal boron nitride; the weight ratio of the antibacterial main material to the antibacterial auxiliary material is 1: 0.16. The artificial coarse aggregate comprises the following raw materials in parts by weight: 21 parts of cement, 1.8 parts of metakaolin, 60 parts of quartz sand, 0.16 part of basalt fiber, 0.035 part of antibacterial agent and 11 parts of deionized water, wherein the natural coarse aggregate is basalt broken stone.
In the present comparative example, the coarse aggregate was formed by mixing natural coarse aggregate and artificial coarse aggregate; the coarse aggregate is prepared by mixing the following steps:
the method comprises the following steps: screening the natural coarse aggregate and the artificial coarse aggregate to respectively obtain the natural coarse aggregate and the artificial coarse aggregate with the grain sizes of (4.75 mm, 16 mm) and (16 mm, 26.5 mm);
step two: the method comprises the steps of weighing natural coarse aggregates and artificial coarse aggregates respectively according to the weight ratio of 1:0.1 of the natural coarse aggregates and the artificial coarse aggregates in a range with the particle size of (4.75 mm, 16 mm), uniformly mixing to obtain first-range coarse aggregates, weighing the natural coarse aggregates and the artificial coarse aggregates respectively according to the weight ratio of 1:0.05 of the natural coarse aggregates and the artificial coarse aggregates in a range with the particle size of (16 mm, 26.5 mm), uniformly mixing to obtain second-range coarse aggregates, putting the first-range coarse aggregates and the second-range coarse aggregates into a stirrer, uniformly mixing and stirring to obtain coarse aggregates, wherein the composition ratio of the first-range coarse aggregates to the second-range coarse aggregates in parts by weight is 1: 0.8.
In this comparative example, the preparation method of the antibacterial asphalt concrete was carried out as follows:
the method comprises the following steps: simultaneously adding the antibacterial main material and the antibacterial auxiliary material into tap water, performing ultrasonic dispersion for 20 minutes, filtering to remove the tap water, and performing ball milling for 2 hours by using a ball mill to obtain an antibacterial agent; wherein the volume of the tap water is 120 times of the sum of the accumulation volume of the antibacterial main material and the accumulation volume of the antibacterial auxiliary material;
step two: heating quartz sand, coarse aggregate, an antibacterial agent and mineral powder in an oven at 180 ℃ for 150 minutes; placing the asphalt in an oven, heating for 160 minutes, manually stirring for 10 times, and then continuously heating until the asphalt is completely melted;
step three: preheating a stirrer to 180 ℃, sequentially adding the heated coarse aggregate, quartz sand and an antibacterial agent into the stirrer, stirring for 40 seconds, then adding the melted asphalt, stirring for 60 seconds, then adding the heated mineral powder, and stirring for 120 seconds to obtain the antibacterial asphalt concrete.
Comparative example 3: without the incorporation of antibacterial agents and artificial coarse aggregates
In the comparative example, the asphalt concrete comprises the following raw materials in parts by weight: 8 parts of asphalt, 40 parts of quartz sand, 150 parts of coarse aggregate and 4 parts of mineral powder; the coarse aggregate used in the comparative example is basalt macadam.
In this comparative example, the preparation method of the asphalt concrete was carried out as follows:
the method comprises the following steps: heating quartz sand, coarse aggregate and mineral powder in an oven at 180 ℃ for 150 minutes; placing the asphalt in an oven, heating for 160 minutes, manually stirring for 10 times, and then continuously heating until the asphalt is completely melted;
step two: preheating a stirrer to 180 ℃, sequentially adding the heated coarse aggregate and quartz sand into the stirrer, stirring for 40 seconds, then adding the melted asphalt, stirring for 60 seconds, then adding the heated mineral powder, and stirring for 120 seconds to obtain the asphalt concrete.
Determination of antibacterial Effect:
according to the raw material proportion and the preparation method of the examples 1-3 and the comparative examples 1-3, the asphalt concrete test pieces with the diameter of 5cm and the thickness of 3cm are respectively manufactured and processed. In the test, staphylococcus aureus and escherichia coli are used as test bacteria, and the antibacterial effect is measured. The surface of the test piece is disinfected by 75% ethanol solution, washed by sterile distilled water and then placed in an ultra-clean transparent box body with constant temperature and humidity of 32 ℃ for later use. Respectively taking 1mL of the solution with the concentration of 105The cfu/mL bacterial liquid is inoculated on the surface of each test piece, and a xenon lamp light source is placed right above the test piece for irradiation. After the test piece inoculated with the bacterial liquid is irradiated for 60min, counting by using a microscope, and judging the antibacterial rate of the test piece according to the percentage difference of the colony number of the test piece and the colony number of the comparative example 3ν i ，ν i =(m-m i )/m×100%；mThe number of colonies after the test piece of comparative example 3 was irradiated with light;m i (i=1,2,3,4) represents the number of colonies after irradiation of light on the test pieces of example 1, example 2, example 3, comparative example 1, and comparative example 2, respectively. The calculation results are shown in table 1.
TABLE 1
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can make equivalent changes and modifications within the technical scope of the present invention disclosed by the present invention.
Claims (7)
1. The antibacterial asphalt concrete is characterized by comprising the following raw materials in parts by weight: 5.5-11 parts of asphalt, 38-50 parts of quartz sand, 95-165 parts of coarse aggregate, 3.5-7 parts of mineral powder and 0.015-0.054 part of an antibacterial agent; the antibacterial agent consists of an antibacterial main material and an antibacterial auxiliary material; the antibacterial main material is the mass combination of nano titanium dioxide, nano graphite phase carbon nitride, nano zirconium dioxide and the like; the antibacterial auxiliary material is nano hexagonal boron nitride; the weight ratio of the antibacterial main material to the antibacterial auxiliary material is 1: 0.15-0.2.
2. The antibacterial asphalt concrete according to claim 1, wherein: the coarse aggregate is formed by mixing natural coarse aggregate and artificial coarse aggregate; the preparation method of the coarse aggregate comprises the following steps:
the method comprises the following steps: screening the natural coarse aggregate and the artificial coarse aggregate to respectively obtain the natural coarse aggregate and the artificial coarse aggregate with the grain sizes of (4.75 mm, 16 mm) and (16 mm, 26.5 mm);
step two: the method comprises the steps of weighing natural coarse aggregates and artificial coarse aggregates respectively according to the weight ratio of 1: 0.1-0.3 of the natural coarse aggregates and the artificial coarse aggregates in a range with the particle size of 4.75mm to 16mm, uniformly mixing to obtain first range coarse aggregates, weighing the natural coarse aggregates and the artificial coarse aggregates respectively according to the weight ratio of 1: 0.05-0.25 of the natural coarse aggregates and the artificial coarse aggregates in a range with the particle size of 16mm to 26.5mm, uniformly mixing to obtain second range coarse aggregates, putting the first range coarse aggregates and the second range coarse aggregates into a stirrer, uniformly mixing and stirring to obtain coarse aggregates, wherein the composition ratio of the first range coarse aggregates to the second range coarse aggregates in parts by weight is 1: 0.6-1.
3. The antibacterial asphalt concrete according to claim 2, wherein: the natural coarse aggregate comprises basalt macadam; the artificial coarse aggregate comprises the following raw materials in parts by weight: 16-25 parts of cement, 0.9-2.5 parts of metakaolin, 45-75 parts of quartz sand, 0.15-0.2 part of basalt fiber, 0.025-0.05 part of antibacterial agent and 8-14.5 parts of deionized water.
4. A method for preparing the antibacterial asphalt concrete according to claim 1, which comprises the following steps:
the method comprises the following steps: simultaneously adding the antibacterial main material and the antibacterial auxiliary material into tap water with the volume of 12-25 minutes, carrying out ultrasonic dispersion, filtering to remove tap water, and then carrying out ball milling for 1.5-3.5 hours by using a ball mill to obtain an antibacterial agent; whereinV 1=(50~300)V 2WhereinV 2Is the sum of the accumulation volume of the antibacterial main material and the accumulation volume of the antibacterial auxiliary material;
step two: dividing the antibacterial agent into three parts by weight, and recording as a first antibacterial agent, a second antibacterial agent and a third antibacterial agent;
step three: adding the first part of antibacterial agent into the mixture with a volume ofV 3Stirring and dispersing the mixture evenly in tap water to obtain lubricating membrane liquid; placing the coarse aggregate into a stirrer, spraying a lubricating film liquid while stirring, continuing stirring for 1.5-3 minutes after the lubricating film liquid is sprayed, pouring the coarse aggregate into a tray, placing the tray in an oven at 80-120 ℃ and heating for 2.5-4 hours to enable the antibacterial agent to be attached to the surface of the coarse aggregate, and obtaining the film-attached coarse aggregate;
step four: stirring the second part of antibacterial agent and the mineral powder for 3-5 minutes to obtain a mixture A; mixing and stirring the third antibacterial agent and the asphalt particles for 2-4 minutes to obtain a mixture B; the asphalt particles are particles obtained by crushing blocky asphalt into particles with the particle size not larger than 12 mm;
step five: heating the quartz sand, the film-attached coarse aggregate and the mixture A in an oven at 160-180 ℃ for 120-240 minutes; placing the mixture B in an oven, heating for 120-180 minutes, then manually stirring for 10-20 times, and continuing heating until the mixture B is completely melted;
step six: and (3) preheating the stirrer, sequentially adding the heated membrane-attached coarse aggregate and quartz sand into the stirrer, stirring for 35-60 seconds, then adding the melted mixture B, stirring for 55-80 seconds, then adding the heated mixture A, and stirring for 120-150 seconds to obtain the antibacterial asphalt concrete.
5. The method for preparing antibacterial asphalt concrete according to claim 4, wherein the method comprises the following steps: manual stirring is that handheld stirring rod extends to the bottom of holding mixture B container, and clockwise stirring 5~10 times earlier, then anticlockwise stirring 5~10 times.
6. The method for preparing antibacterial asphalt concrete according to claim 4, wherein the method comprises the following steps: the preheating temperature of the stirrer is 160-180 ℃.
7. The method for preparing antibacterial asphalt concrete according to claim 4, wherein the method comprises the following steps: the above-mentionedV 3=(0.25~0.5)V 4，V 4Is the bulk of the coarse aggregate.
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| KR100992843B1 (en) * | 2010-05-19 | 2010-11-08 | 정상철 | The manufacturing method of eco-friendly asphalt pavement and the asphalt pavement |
| CN109610261A (en) * | 2018-12-29 | 2019-04-12 | 苏州科技大学 | A kind of modified asphalt mixture road surface and preparation method |
| CN110423477A (en) * | 2019-08-21 | 2019-11-08 | 南京林业大学 | A kind of antibacterial type modified pitch and preparation method thereof |
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| KR100992843B1 (en) * | 2010-05-19 | 2010-11-08 | 정상철 | The manufacturing method of eco-friendly asphalt pavement and the asphalt pavement |
| CN109610261A (en) * | 2018-12-29 | 2019-04-12 | 苏州科技大学 | A kind of modified asphalt mixture road surface and preparation method |
| CN110423477A (en) * | 2019-08-21 | 2019-11-08 | 南京林业大学 | A kind of antibacterial type modified pitch and preparation method thereof |
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| CN112551964A (en) * | 2021-01-15 | 2021-03-26 | 福州大学 | Antibacterial cement mortar and preparation and application methods thereof |
| CN112551964B (en) * | 2021-01-15 | 2021-11-30 | 福州大学 | Antibacterial cement mortar and preparation and application methods thereof |
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