CN111747685A - Environment-friendly odorless asphalt mixture and preparation method thereof - Google Patents
Environment-friendly odorless asphalt mixture and preparation method thereof Download PDFInfo
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- CN111747685A CN111747685A CN202010663255.1A CN202010663255A CN111747685A CN 111747685 A CN111747685 A CN 111747685A CN 202010663255 A CN202010663255 A CN 202010663255A CN 111747685 A CN111747685 A CN 111747685A
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B26/00—Compositions of mortars, concrete or artificial stone, containing only organic binders, e.g. polymer or resin concrete
- C04B26/02—Macromolecular compounds
- C04B26/26—Bituminous materials, e.g. tar, pitch
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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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00025—Aspects relating to the protection of the health, e.g. materials containing special additives to afford skin protection
Abstract
The invention discloses an environment-friendly odorless asphalt mixture and a preparation method thereof, and relates to the technical field of asphalt concrete. The environment-friendly odorless asphalt mixture comprises 100-150 parts of matrix asphalt or modified asphalt; 0.1-0.5 part of a smell cleaning agent; 0.05-0.1 part of dispersant; 5-10 parts of carbonized rice hull powder; 1500-2000 parts of aggregate; 50-100 parts of mineral powder. The preparation method comprises the following steps: s1, mixing the carbonized rice hull powder with the smell purifying agent, adding 1/2 dispersing agent, and uniformly stirring; s2, heating the matrix asphalt or the modified asphalt to 140-170 ℃, adding the dispersing agent and the mixture obtained in the step S1 under the stirring condition, and uniformly stirring to obtain environment-friendly odorless asphalt; s3, mixing the mineral powder and the aggregate uniformly, heating to 120-170 ℃, adding the environment-friendly odorless asphalt obtained in the step S2, and mixing uniformly to obtain the environment-friendly odorless asphalt. The invention treats volatile organic matters in the asphalt mixture from the source, thereby reducing the generation of asphalt smoke in the production and construction processes of the asphalt mixture and achieving the purposes of environmental protection and odor elimination.
Description
Technical Field
The invention relates to the technical field of asphalt concrete, in particular to an environment-friendly odorless asphalt mixture and a preparation method thereof.
Background
The process of heating asphalt for paving roads, repairing houses or using the asphalt as an anticorrosive coating can generate a large amount of asphalt smoke, which has serious influence on the surrounding environment and is harmful to the health of people.
The smoke contains various organic matters including carbocyclic hydrocarbon, cyclic hydrocarbon derivatives and other compounds, which have harmful effects on human health, and the asphalt smoke contains various cyclic aromatic hydrocarbon substances such as benzopyrene, benzanthracene, carbazole and the like, most of which are carcinogenic and strong carcinogenic substances, the particle size is 0.1-1 mu m, the minimum is only 0.01 mu m, the maximum is about 10 mu m, and particularly, the smoke contains various carcinogenic substances represented by 3, 4-benzopyrene. The gas includes harmful gas with pungent smell, such as hydrogen sulfide, sulfur dioxide, ammonia gas, etc. These gases either result from the volatilization of light components from the bitumen or from the oxidation of some of the components of the bitumen, which, while polluting the atmosphere, can also have an adverse effect on human health.
The asphalt flue gas is treated by adding a flue gas purification device in the prior stage, for example, an absorption purification method is to utilize different solubilities of the absorbent selected by each mixed component in the waste gas or the reaction of a certain component and an active component in the absorbent to purify the waste gas; for another example, the adsorption purification method is an operation of using a porous solid (adsorption filter material) to accumulate or condense one or more components in a liquid (gas or liquid) mixture on the surface to achieve separation; however, the flue gas treatment equipment has large investment in the early stage and high operation cost, and the emission is reduced by intelligently collecting the flue gas in the asphalt production process, so that the secondary emission of the asphalt flue gas in the subsequent asphalt construction application cannot be avoided.
Therefore, a new solution is needed to solve the above problems.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide the environment-friendly odor-free asphalt mixture, which is used for treating volatile organic matters in the asphalt mixture from the source, so that the generation of asphalt smoke in the production and construction processes of the asphalt mixture is reduced, and the purposes of environment protection and odor removal are achieved.
The second purpose of the invention is to provide a preparation method of the environment-friendly odorless asphalt mixture, which has the advantages of simple operation method and suitability for large-scale production.
In order to achieve the first purpose, the invention provides the following technical scheme:
an environment-friendly odorless asphalt mixture comprises the following components in parts by weight:
base asphalt or modified asphalt: 100-150 parts;
flavor-purifying agent: 0.1-0.5 part;
dispersing agent: 0.05-0.1 part;
carbonizing rice hull powder: 5-10 parts;
aggregate: 1500-2000 parts;
mineral powder: 50-100 parts.
By adopting the technical scheme, aiming at different construction requirements, the asphalt can adopt matrix asphalt or modified asphalt, and the performances of the mixture obtained by different types of asphalt are different; the odor eliminator mainly acts to suppress or decompose pungent odor substances, such as H from the volatilization of light components in asphalt2S、SO2、NH3Noxious gases with pungent odors; the carbonized rice hull powder achieves the effect of reducing the discharge amount of pungent odor in a physical adsorption mode; the dispersing agent can eliminate the interfacial activity between the odor purifying agent and the asphalt and between the odor purifying agent and the carbonized rice husk powder, so that the odor purifying agent is uniformly and stably dispersed in the asphalt and the carbonized rice husk powder.
The carbonized rice hull powder is obtained by carbonizing waste rice hulls serving as a raw material, contains rich lignin, has excellent adsorbability, can play a role in physically adsorbing pungent odor gas, has a certain amplification effect on the softening point and viscosity of asphalt due to the fact that the main component of the carbonized rice hull powder is silicon dioxide, reduces the penetration degree, improves the ductility of the asphalt, and can remarkably improve the ultraviolet aging resistance of the silicon dioxide. According to the invention, the carbonized rice hull powder and the smell purifying agent are compounded for use, the smell purifying agent can be pre-dispersed in pores of the carbonized rice hull powder, and the carbonized rice hull powder and the smell purifying agent cooperate to achieve a good smell purifying effect.
Further preferably, the odor eliminator is an aldehyde compound selected from one or more of vanillin, 5-hydroxy-2-methoxy-benzaldehyde and 3-ethylhexyl aldehyde.
By adopting the technical scheme, the aldehyde compounds can mainly perform chemical reaction with substances with small molecular weight and light pungent odor in the asphalt, particularly sulfides, to generate new substances without emission, with large molecular weight and heavy weight, so that emission is reduced, and odor generated by volatile matters is eliminated.
Further preferably, the carbonized rice hull powder is obtained by the following preparation steps: boiling rice hull in 10 vol% dilute hydrochloric acid for 1 hr, washing, oven drying, carbonizing at 580 deg.C in high temperature furnace for 2 hr, and grinding with grinding aid to obtain carbonized rice hull powder with particle size of 0.5-1 μm.
By adopting the technical scheme, the carbonized rice hull powder in the invention adopts the raw material rice hull which is agricultural waste, has wide source, reasonably utilizes the waste, has the advantages of environmental protection and environmental protection, and has simpler preparation method, thus being suitable for large-scale production.
More preferably, the grinding aid adopts ethylene glycol, and 0.025mL of ethylene glycol is added into every 1g of carbonized rice hull powder.
By adopting the technical scheme, the ground rice hull powder has huge surface energy and serious secondary agglomeration tendency, and the grinding aid is added to perform dispersion depolymerization on the rice hull powder, so that the ground carbonized rice hull powder is uniform in distribution and stable in storage.
More preferably, the base asphalt is petroleum asphalt, and the modified asphalt is SBS modified asphalt.
More preferably, the dispersant is one selected from lecithin and alkyldimethylbetaine.
By adopting the technical scheme, the dispersing agent can eliminate the interfacial activity between the odor purifying agent and the asphalt and between the odor purifying agent and the carbonized rice husk powder, so that the odor purifying agent is uniformly and stably dispersed in the asphalt and the carbonized rice husk powder.
More preferably, the aggregate is selected from one of basalt, diabase and limestone, and has a particle size of 4.75-9.25 mm.
By adopting the technical scheme, the limestone has good processability, polishing performance and cementing performance, and can have good combination effect with the asphalt; the pavement performance of the asphalt mixture can be improved by adding a certain amount of diabase aggregates, and the price of diabase is lower than that of limestone, so that the cost can be reduced to a greater extent; most of the basalt is neutral, has many pores and is hard in texture; when the asphalt mixture is mixed for use, a good matching effect can be achieved, and the integral structural strength of the asphalt mixture is greatly improved. Meanwhile, the particle size of the basalt is larger than that of the limestone, and the basalt and the limestone are both formed by particles with different particle sizes, so that larger gaps are not easily formed among the basalt and the limestone, the whole body is compact, and the asphalt mixture has good and stable structural strength.
Further preferably, the mineral powder grading range is as follows:
mesh (mm)13.29.54.752.361.180.60.30.15
Transmittance (%) 10097.463.348.534.426.612.38.4.
By adopting the technical scheme, the mineral powder plays a role in filling the asphalt mixture, gaps of the asphalt concrete, sometimes called as fillers, can be reduced, and the mineral powder and the asphalt in the gradation range jointly form asphalt mucilage, so that the strength and the stability of the asphalt concrete are improved.
In order to achieve the second purpose, the invention provides the following technical scheme:
the preparation method of the environment-friendly odorless asphalt mixture comprises the following steps of:
s1, mixing the carbonized rice hull powder with the smell purifying agent, adding 1/2 dispersing agent, and stirring and mixing for 10-15min at the rotating speed of 200-400 r/min;
s2, heating the matrix asphalt or the modified asphalt to 140-170 ℃, adding the dispersing agent and the mixture obtained in the step S1 at the rotating speed of 200-400r/min, and stirring for 15-30min to obtain environment-friendly odorless asphalt;
s3, uniformly mixing the mineral powder and the aggregate, heating to 120-170 ℃, adding the environment-friendly odorless asphalt obtained in the step S2, and stirring at the rotating speed of 400-600r/min for 1-5min to obtain the environment-friendly odorless asphalt mixture.
In summary, compared with the prior art, the invention has the following beneficial effects:
(1) the invention can inhibit or decompose irritant odor substances from chemical reaction by adding odor-removing agent, such as H from volatile light components in asphalt2S、SO2、NH3Noxious gases with pungent odors; the effect of reducing the discharge amount of the pungent odor is achieved by adding the carbonized rice hull powder and adopting a physical adsorption mode;
(2) according to the invention, the carbonized rice hull powder and the smell purifying agent are compounded for use, the smell purifying agent can be pre-dispersed in pores of the carbonized rice hull powder, and the carbonized rice hull powder and the smell purifying agent cooperate to achieve a good smell purifying effect;
(3) the odor purifying agent adopts aldehyde compounds, which can mainly react with substances with small molecular weight and light pungent odor in the asphalt, especially sulfides, to generate new substances with large molecular weight and heavy non-emission, thereby reducing emission and eliminating odor generated by volatile matters.
Drawings
FIG. 1 is a flow chart of a process for preparing an environmentally friendly odorless asphalt mixture in example 1 of the present application.
Detailed Description
The invention is described in detail below with reference to the figures and examples.
In the invention, the petroleum asphalt and the SBS modified asphalt are both purchased from Shandong Hua grease chemical Co.
The mineral powder is limestone mineral powder with a grading range of
Mesh (mm)13.29.54.752.361.180.60.30.15
Transmittance (%) 10097.463.348.534.426.612.38.4.
Other raw material components are all commonly purchased in the market.
Example 1: the environment-friendly odorless asphalt mixture comprises the following components in parts by weight as shown in table 1 and shown in figure 1, and is prepared by the following steps:
s1, mixing the carbonized rice hull powder with the smell purifying agent, adding 1/2 dispersing agent, and stirring and mixing for 15min at the rotating speed of 200 r/min;
s2, heating the petroleum to 140 ℃, adding the dispersing agent and the mixture obtained in the step S1 at the rotating speed of 200r/min, and stirring for 30min to obtain the environment-friendly odorless asphalt;
s3, uniformly mixing the mineral powder and the aggregate, heating to 120 ℃, adding the environment-friendly odorless asphalt obtained in the step S2, and stirring at the rotating speed of 400r/min for 5min to obtain the environment-friendly odorless asphalt mixture.
In the example, vanillin is used as the flavor cleaning agent, lecithin is used as the dispersing agent, and basalt aggregates with the average particle size of 4.75 are used as the aggregates.
The carbonized rice hull powder is obtained by the following preparation method: boiling 1kg of rice hull in 2L of 10% dilute hydrochloric acid, washing with clear water, drying at 40 deg.C, carbonizing at 580 deg.C in high temperature furnace for 2h, and grinding with 25mL of ethylene glycol to obtain carbonized rice hull powder with average particle size of 0.5 μm.
Examples 2 to 6: an environment-friendly odorless asphalt mixture is different from the environment-friendly odorless asphalt mixture in example 1 in that the components and the corresponding parts by weight are shown in Table 1.
TABLE 1 Components and parts by weight of examples 1-6
Example 7: an environment-friendly odorless asphalt mixture is different from the environment-friendly odorless asphalt mixture in the embodiment 1 in that SBS modified asphalt is adopted to replace petroleum asphalt, and the preparation steps are as follows:
s1, mixing the carbonized rice hull powder with the smell purifying agent, adding 1/2 dispersing agent, and stirring and mixing for 10min at the rotating speed of 400 r/min;
s2, heating SBS modified asphalt to 170 ℃, adding dispersant and the mixture obtained in the step S1 at the rotating speed of 400r/min, and stirring for 15min to obtain the environment-friendly odorless asphalt composition;
in this example, the flavor enhancer was a mixture of vanillin and 5-hydroxy-2-methoxy-benzaldehyde in a weight ratio of 1:1, the dispersant was alkyldimethylbetaine, and the aggregate was limestone with an average particle size of 9.25.
The carbonized rice hull powder is obtained by the following preparation method: boiling 1kg of rice hull in 2L of 10% dilute hydrochloric acid, washing with clear water, drying at 40 deg.C, carbonizing at 580 deg.C in high temperature furnace for 2h, and grinding with 25mL of ethylene glycol to obtain carbonized rice hull powder with average particle size of 1 μm.
Example 8: an environment-friendly odorless asphalt mixture is different from the environment-friendly odorless asphalt mixture in example 1 in that the odor purifying agent is a mixture of vanillin, 5-hydroxy-2-methoxy-benzaldehyde and 3-ethylhexyl aldehyde in a weight ratio of 1:1:1, and diabase with the average particle size of 6.5mm is used as aggregate.
Comparative example 1: an asphalt mixture, which is different from example 1 in that no odorant and carbonized rice husk powder were added, was prepared from SBS modified asphalt, aggregate, and mineral powder, and the mass fractions and preparation steps of the components were referred to example 1.
Comparative example 2: an asphalt mixture which was different from example 1 in that no odor eliminating agent and carbonized rice husk powder were added and which was prepared from petroleum asphalt, an aggregate and a mineral powder, and the mass fractions and preparation steps of the components were referred to example 1.
Comparative example 3: an asphalt mixture was different from example 1 in that no odor eliminating agent was added.
Comparative example 4: a bitumen composition which differs from that of example 1 in that no carbonized rice husk powder is added.
Performance testing
The asphalt compositions prepared in examples 1 to 8 and comparative examples 1 to 4 were subjected to the odor irritation strength test and the mechanical property test of the asphalt mixture, respectively, and the test results are shown in table 2.
Odor intensity standard:
level 0: is tasteless;
level 1: the smell is barely felt;
and 2, stage: very weak odor but with distinguishable properties;
and 3, level: the smell is easy to feel;
4, level: a strong odor;
and 5, stage: an intolerable strong smell.
As can be seen from the test data in Table 2, the odor intensity of the resulting asphalt mixture was significantly reduced by adding the odorant and the carbonized rice husk powder, and examples 1 to 8 were all grade 1, and had good reproducibility. By comparing the stability, the residual stability and the freeze-thaw split tensile strength ratio, the differences between examples 1-6 and 8 and comparative examples 2-4 and between example 7 and comparative example 1 are almost the same, namely, the mechanical properties of the asphalt mixture are slightly affected after the addition of the odor purifying agent and the carbonized rice husk powder. In conclusion, the asphalt mixture obtained by adding the odor purifying agent and the carbonized rice husk powder has less pungent odor and good road performance.
Table 2 odor intensity and mechanical property test results
The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may occur to those skilled in the art without departing from the principle of the invention, and are considered to be within the scope of the invention.
Claims (9)
1. The environment-friendly odorless asphalt mixture is characterized by comprising the following components in parts by weight:
base asphalt or modified asphalt: 100-150 parts;
flavor-purifying agent: 0.1-0.5 part;
dispersing agent: 0.05-0.1 part;
carbonizing rice hull powder: 5-10 parts;
aggregate: 1500-2000 parts;
mineral powder: 50-100 parts.
2. The environment-friendly odor-free asphalt mixture according to claim 1, wherein the odor-free agent is an aldehyde compound selected from one or more of vanillin, 5-hydroxy-2-methoxy-benzaldehyde and 3-ethylhexyl aldehyde.
3. The environment-friendly odorless asphalt mixture according to claim 1, wherein the carbonized rice hull powder is obtained by the following preparation steps: boiling rice hull in 10 vol% dilute hydrochloric acid for 1 hr, washing, oven drying, carbonizing at 580 deg.C in high temperature furnace for 2 hr, and grinding with grinding aid to obtain carbonized rice hull powder with particle size of 0.5-1 μm.
4. The environment-friendly odor-free asphalt mixture as claimed in claim 3, wherein the grinding aid is ethylene glycol, and 0.025mL of ethylene glycol is added to 1g of carbonized rice hull powder.
5. The environment-friendly odor-free asphalt mixture as defined in claim 1, wherein said base asphalt is petroleum asphalt and said modified asphalt is SBS modified asphalt.
6. The environment-friendly odor-free asphalt mixture as defined in claim 1, wherein said dispersant is one selected from the group consisting of lecithin and alkyl dimethyl betaine.
7. The environment-friendly odor-free asphalt mixture according to claim 1, wherein the aggregate is one selected from the group consisting of basalt aggregate, diabase aggregate and limestone aggregate, and has a particle size of 4.75 to 9.25 mm.
8. The environment-friendly odorless asphalt mixture according to claim 1, wherein the mineral powder grading ranges are as follows:
mesh (mm)13.29.54.752.361.180.60.30.15
Transmittance (%) 10097.463.348.534.426.612.38.4.
9. The method for preparing the environment-friendly odorless asphalt mixture according to any one of claims 1 to 8, which is characterized by comprising the following steps of:
s1, mixing the carbonized rice hull powder with the smell purifying agent, adding 1/2 dispersing agent, and stirring and mixing for 10-15min at the rotating speed of 200-400 r/min;
s2, heating the matrix asphalt or the modified asphalt to 140-170 ℃, adding the dispersing agent and the mixture obtained in the step S1 at the rotating speed of 200-400r/min, and stirring for 15-30min to obtain environment-friendly odorless asphalt;
s3, uniformly mixing the mineral powder and the aggregate, heating to 120-170 ℃, adding the environment-friendly odorless asphalt obtained in the step S2, and stirring at the rotating speed of 400-600r/min for 1-5min to obtain the environment-friendly odorless asphalt mixture.
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| CN114573283A (en) * | 2022-05-05 | 2022-06-03 | 湖南路桥建设集团有限责任公司 | Environment-friendly odorless asphalt mixture and preparation method thereof |
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Application publication date: 20201009 |