CN109293281B - Modified asphalt mixture and preparation method thereof - Google Patents
Modified asphalt mixture and preparation method thereof Download PDFInfo
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- CN109293281B CN109293281B CN201811225284.9A CN201811225284A CN109293281B CN 109293281 B CN109293281 B CN 109293281B CN 201811225284 A CN201811225284 A CN 201811225284A CN 109293281 B CN109293281 B CN 109293281B
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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
- 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
Abstract
The invention discloses a modified asphalt mixture and a preparation method thereof. The modified asphalt mixture is prepared from the following raw materials in parts by weight: 6-15 parts of modified asphalt, 95-120 parts of aggregate, 18-30 parts of filler, 3-7 parts of warm mixing agent and 0.5-3 parts of auxiliary agent. The preparation method comprises the following steps: weighing the materials according to the formula proportion, preheating the aggregate, mixing the preheated aggregate with the auxiliary agent, performing dry mixing, adding the modified asphalt and the warm mixing agent, uniformly mixing, adding the filler, and mixing. The modified asphalt mixture prepared by the invention has the advantages of compact structure, strong pressure resistance, difficult cracking and convenient transportation and construction, and in addition, the preparation method has the advantage of low requirement on temperature.
Description
Technical Field
The invention relates to the technical field of highway engineering, in particular to a modified asphalt mixture and a preparation method thereof.
Background
Along with the rapid development of highway road construction in China, the connection among various cities is strengthened, and cultural communication of different regions is promoted, but along with the increase of heavy traffic and the increase of tire pressure of vehicles, the rapid increase of the number of automobiles puts higher requirements on the highway road construction. The asphalt pavement is characterized in that mineral materials are mixed with various types of pavements paved with asphalt materials, and the asphalt mixture improves the capability of paving granules for resisting damage of driving and natural factors to the pavements, so that the pavements are smooth, less in dust, waterproof and durable. The asphalt pavement is made up by spreading and rolling asphalt mixture, and the asphalt mixture is made up by fully mixing asphalt material with a certain viscosity and proper dosage with a certain graded mineral aggregate. However, asphalt pavements also have various diseases such as cracking, moving, rutting, etc., and especially, the diseases are increasingly serious with the increase of heavy vehicles and the overload operation of the vehicles.
In the prior art, chinese patent No. CN108249825A discloses a method for preparing an asphalt mixture and the asphalt mixture, which uses asphalt, rubber, water-soluble silicate, ceramsite, perlite, slag and river sand, and the asphalt mixture is obtained by melting the above materials for four times, mixing and stirring at 170-185 ℃. Rubber is added in the middle preparation step of the asphalt mixture, so that the uniformity and the comprehensive performance of the asphalt mixture are improved, and the crack resistance of the asphalt mixture after paving is enhanced. However, the asphalt added with rubber has high viscosity, the mixture needs to be heated to high temperature in the construction process, a lot of problems are brought to mixing, transportation and rolling of the asphalt mixture, the construction cost is high, particularly in places with long transportation distance and generally low environmental temperature in high-altitude mountain areas, the temperature of the asphalt mixture is reduced too fast in the links of mixing, transportation, rolling and the like, so that the limitation of pavement construction is strengthened, the construction period is prolonged, a large amount of energy is consumed for heating the asphalt and mineral aggregate, the generation of waste gas and dust particles in the production and construction processes is increased, and the environmental protection is not facilitated.
Disclosure of Invention
Aiming at the defects in the prior art, the first object of the invention is to provide a modified asphalt mixture which has the advantages of low mixing temperature, compact structure, strong pressure resistance and difficult cracking.
The second purpose of the invention is to provide a preparation method of the modified asphalt mixture, which has the advantages of simple method and low temperature requirement.
In order to achieve the first object, the invention provides the following technical scheme: the modified asphalt mixture is prepared from the following raw materials in parts by weight: 6-15 parts of modified asphalt, 95-120 parts of aggregate, 18-30 parts of filler, 3-7 parts of warm mixing agent and 0.5-3 parts of auxiliary agent.
The modified asphalt comprises base asphalt and a modifier, wherein the modifier comprises at least one of high-density polyethylene, ethylene-vinyl acetate copolymer and styrene thermoplastic elastomer.
The aggregate comprises at least one of crushed stone, expanded perlite and ceramsite.
The filler comprises at least one of mineral powder, slaked lime and sand.
The auxiliary agent comprises at least two of a stripping resistant agent, an anti-aging agent and a stabilizing agent.
By adopting the technical scheme, the warm mixing agent, the anti-stripping agent, the anti-aging agent, the stabilizer and other auxiliaries are added in the process of mixing the aggregate, the filler and the modified asphalt, and various components are matched with each other, so that the mixing temperature of the asphalt mixture is effectively reduced, and the problems of cracks, ruts and the like of the pavement paved with the asphalt mixture are reduced. The modified asphalt is modified by high-density polyethylene, ethylene-vinyl acetate copolymer or styrene thermoplastic elastomer, the styrene thermoplastic elastomer mainly comprises block copolymers of styrene and butadiene, isoprene, ethylene-butylene and ethylene-propylene respectively, and the modified asphalt has good high-temperature stability and elastic recovery capacity by adopting the modified materials, and is favorable for improving the cohesiveness between aggregate and the modified asphalt by matching with a warm mixing agent. The molecular structure of the warm mixing agent contains the lipophilic group and the hydrophilic group, so that in the mixing process, the moisture contained in the asphalt mixture is reduced, the residual moisture is combined with the hydrophilic group of the warm mixing agent, and the lipophilic group of the warm mixing agent is combined with the modified asphalt, so that the warm mixing agent forms a structural water film with a lubricating function between the asphalt mixtures, the mixing property of the asphalt mixture is improved, and the mixing temperature of the asphalt mixture is reduced. Meanwhile, the warm mixing agent improves the compactibility of the asphalt mixture, and after the structural water film dissipates with water molecules, the warm mixing agent is concentrated on the boundary of the modified asphalt and the aggregate, so that the improvement of the cohesiveness between the modified asphalt and the aggregate is facilitated, and the cracking and moving problems of the asphalt pavement are reduced.
Further, the mixture is prepared from the following raw materials in parts by weight: 8-10 parts of modified asphalt, 100-110 parts of aggregate, 20-35 parts of filler, 3-5 parts of warm mixing agent, 0.2-0.5 part of anti-stripping agent and 0.5-1.5 parts of stabilizer.
The aggregate is also called aggregate, and can be divided into coarse aggregate and fine aggregate according to different particle sizes of raw materials, and is a component playing a role of a framework in the asphalt mixture. The expanded perlite is a natural vitreous lava, comprises perlite, pitchstone and obsidian, has good heat preservation efficiency and super-strong stability, and is favorable for the structural stability of the modified asphalt mixture. The ceramsite is a ceramic particle, the surface of the ceramsite is a hard ceramic or enamel shell, the interior of the ceramsite is of a fine honeycomb structure, and the ceramsite has the characteristics of light weight, high strength and corrosion resistance, and is beneficial to reducing the weight of the asphalt mixture. The crushed stone is crushed stone, and further comprises at least one of basalt crushed stone, quartz crushed stone and amphibole crushed stone. Basalt is a basic eruption rock, mainly composed of basic feldspar and pyroxene, has the advantages of strong compressive resistance, low crushing value, strong corrosion resistance and good adhesion with asphalt, and is suitable for being used as an aggregate of asphalt mixtures. The quartzite is metamorphic rock mainly composed of quartz, has the characteristics of high hardness, fine particles and compact structure, has excellent high-temperature resistance, and is favorable for enhancing the skeleton effect of aggregate. The amphibole mainly comprises plagioclase and one or more dark minerals, has good compressive strength and strong corrosion resistance, and is beneficial to improving the compressive strength and the corrosion resistance of the modified asphalt mixture.
Furthermore, materials with the particle size of 0-5 mm in the aggregate account for 25-35% of the total amount of the aggregate, materials with the particle size of 5-10 mm account for 20-25% of the total amount of the aggregate, materials with the particle size of 10-15 mm account for 26-35% of the total amount of the aggregate, and materials with the particle size of 15-20 mm account for 8-15% of the total amount of the aggregate.
By adopting the technical scheme, the aggregate has better compactness and mixing property in the grading range, and is beneficial to the mixing of the aggregate, the filler and the modified asphalt and the quality performance of the modified asphalt mixture.
The filler generally refers to materials filled in other objects, and the asphalt mixture mainly refers to materials such as gravel powder with small particle size and the like filled in an aggregate framework. The mineral powder is a general name of stone powder and substitutes thereof meeting engineering requirements, the stone powder is mainly a product obtained by crushing and processing the ore, the substitutes comprise blast furnace slag powder, and the mineral powder is added into the asphalt mixture, so that the mechanical property of the asphalt mixture is favorably improved, the preparation cost of the asphalt mixture is reduced, and the compactness, impermeability and erosion resistance of the asphalt mixture are improved. The slaked lime, namely calcium hydroxide, is used as a filler, so that the water stability of the modified asphalt mixture can be effectively improved, and the high-temperature resistance, the low-temperature crack resistance and the fatigue resistance of the modified asphalt mixture are improved. The sand is particles ground from stone or manufactured silica particles, and can improve the compactness and the strength of the asphalt mixture.
The anti-stripping agent forms physical adsorption with the aggregate surface or is subjected to chemical combination reaction with the aggregate by means of a special chemical structure of the anti-stripping agent, so that a powerful chemical tie is formed, and an auxiliary agent for improving the adhesion between the asphalt and the aggregate is mainly fatty amine, amidoamine and imidazolium, so that the anti-stripping agent is beneficial to enhancing the adhesion and the water damage resistance strength between the modified asphalt and the aggregate, and is beneficial to prolonging the service life of an asphalt pavement. The anti-aging agent can improve the heat resistance, oxygen resistance and light aging resistance of the modified asphalt mixture, and is beneficial to improving the fatigue resistance of the modified asphalt mixture. The stabilizer is cellulose added in the asphalt mixture to improve the uniformity and stability of the asphalt mixture in the processes of production, transportation, paving and rolling, and the cellulose used here can be lignin fiber, polymer fiber or mineral fiber. Further, the stabilizing agent comprises sepiolite fibers and polyvinyl alcohol fibers, and the mass ratio of the sepiolite fibers to the polyvinyl alcohol fibers is 1: (2-3). The sepiolite fiber is natural mineral fiber, has extremely high heat resistance and acid resistance, has good colloid rheological property, stability and adsorptivity, can be matched with a warm mixing agent to promote the uniform distribution of the sepiolite fiber between asphalt and aggregate, and is favorable for improving the dispersion effect on the asphalt and the filler. The polyvinyl alcohol fiber is a synthetic fiber which is processed by using polyvinyl alcohol with high polymerization degree as a raw material through a specific technology, has the advantages of high strength, high modulus, wear resistance, acid and alkali resistance and good weather resistance, and has good dispersibility.
Further, the modifier comprises high-density polyethylene and an ethylene-vinyl acetate copolymer, wherein the mass ratio of the high-density polyethylene to the ethylene-vinyl acetate copolymer is 1: (1.5-3), wherein the addition amount of the modifier is 4-6% of the mass of the matrix asphalt.
By adopting the technical scheme, the modifier which is prepared by mixing the high-density polyethylene and the ethylene-vinyl acetate copolymer according to the proportion is beneficial to improving the high-temperature stability, the water stability and the low-temperature crack resistance of the modified asphalt, and can be matched with a warm mixing agent to enhance the easy mixing property between the modified asphalt and aggregates and fillers and improve the comprehensive performance of the modified asphalt mixture.
Further, the mass ratio of the modified asphalt to the warm mixing agent to the stabilizer is (2-3): 1: (0.3-0.5).
By adopting the technical scheme, the modified asphalt, the warm mixing agent and the stabilizer are matched with each other, and the modified asphalt and the warm mixing agent have good binding force, thereby being beneficial to improving the action effect of the warm mixing agent. Meanwhile, the stabilizer can promote the distribution uniformity of the warm-mixing agent in the asphalt mixture, and is favorable for improving the bonding effect between the modified asphalt and the aggregate and improving the impact resistance and durability of the modified asphalt pavement under the synergistic cooperation effect of the warm-mixing agent and the stabilizer.
In order to achieve the second object, the invention provides the following technical scheme: a preparation method of a modified asphalt mixture comprises the following steps:
the method comprises the following steps: weighing the materials according to the formula proportion, preheating the aggregate to 140-145 ℃, adding the auxiliary agent, and dry-mixing for 15-25 s to obtain a dry-mixed mixture.
Step two: and adding the modified asphalt and the warm mixing agent into the dry mixing mixture, mixing for 150-210 s at 140-150 ℃, adding the filler, and mixing for 4-6 min to obtain the asphalt mixture.
By adopting the technical scheme, the aggregate, the filler and the auxiliary agent are uniformly mixed, the modified asphalt and the warm-mixing agent are added, the stabilizer promotes the uniform dispersion of the warm-mixing agent in the mixture, the warm-mixing agent forms a structural water film with a lubricating function between the modified asphalt and the aggregate, the easy mixing property of the mixture is improved, the mixing temperature and the construction temperature of the modified asphalt mixture are reduced, and the comprehensive performance of the modified asphalt mixture is favorably improved under the matching action of various auxiliary agents and the warm-mixing agent.
Further, the modified asphalt is prepared according to the following method: preheating the matrix asphalt to 160-165 ℃, adding the modifier into the matrix asphalt, keeping the temperature at 160-170 ℃ for 10-15 min, shearing the mixture of the matrix asphalt and the modifier at a high speed of 4000rpm for 0.8-1.5 h, and obtaining the modified asphalt after shearing.
In conclusion, the invention has the following beneficial effects:
firstly, the invention adopts the action of the warm mixing agent, the stabilizer and the modified asphalt to synergistically improve the mixing property and the stability of the modified asphalt mixture, can obviously reduce the mixing and construction temperature of the modified asphalt mixture, improves the bonding acting force between the modified asphalt and the aggregate, is beneficial to eliminating the limitation of higher temperature on the preparation, transportation and construction of the modified asphalt mixture, and is also beneficial to improving the crack resistance and the aging resistance of the asphalt pavement.
The basalt macadam, the quartzite macadam, the amphibole macadam or the expanded perlite macadam, the ceramsite and the like are preferably adopted as the aggregate, so that the structural strength and the compressive property of the modified asphalt mixture are favorably improved, and meanwhile, the compactness of the modified asphalt mixture and the mechanical property of the modified asphalt mixture are favorably improved by limiting the grading range of the aggregate.
In the invention, sepiolite fibers and polyvinyl alcohol fibers are preferably adopted as the stabilizing agent, high-density polyethylene and ethylene-vinyl acetate are preferably adopted as the modifying agent, the dosage proportion of the modifying agent to the matrix asphalt and the dosage proportion range of the stabilizing agent, the warm mixing agent and the modified asphalt are limited, and the improvement of the compounding synergistic effect among multiple components is facilitated, so that the improvement of the comprehensive performance of the modified asphalt mixture is facilitated.
Detailed Description
The present invention will be described in further detail with reference to examples.
Examples of production of modified Pitch
Preparation example 1
Preheating 15kg of matrix asphalt to 160 ℃, adding 0.6kg of high-density polyethylene into the matrix asphalt, keeping the temperature at 160 ℃ for 15min, shearing the mixture of the matrix asphalt and the high-density polyethylene at a high speed of 4000rpm for 1.5h, and obtaining the modified asphalt after the shearing is finished.
Preparation example 2
Preheating 10kg of matrix asphalt to 165 ℃, adding 0.6kg of styrene-butadiene-styrene block copolymer into the matrix asphalt, keeping the temperature at 170 ℃ for 10min, shearing the mixture of the matrix asphalt and the styrene-butadiene-styrene block copolymer at a high speed, wherein the shearing speed is 4000rpm, the shearing time is 0.8h, and obtaining the modified asphalt after the shearing is finished.
Preparation example 3
Preheating 10kg of matrix asphalt to 163 ℃, adding 0.15kg of high-density polyethylene and 0.35kg of ethylene-vinyl acetate copolymer into the matrix asphalt, keeping the mixture at 165 ℃ for 12min, shearing the mixture of the matrix asphalt and the styrene-butadiene-styrene block copolymer at a high speed, wherein the shearing speed is 4000rpm, the shearing time is 1.2h, and obtaining the modified asphalt after the shearing is finished.
The asphalt used in each of the above examples was No. 90 asphalt.
Examples
Example 1
The embodiment provides a preparation method of a modified asphalt mixture, which comprises the following steps:
the method comprises the following steps: weighing 6kg of modified asphalt, 60kg of basalt macadam, 35kg of expanded perlite, 13kg of mineral powder, 5kg of slaked lime, 3kg of warm-mixing agent, 0.2kg of sepiolite fiber and 0.3kg of polyvinyl alcohol fiber. Wherein, the mixture of the basalt broken stone and the expanded perlite is sieved together, the passing rate of a screen with 4.75mm mesh size is 27.6%, the passing rate of a screen with 9.5mm mesh size is 50.8%, the passing rate of a screen with 13.2mm mesh size is 85.2%, and the passing rate of a screen with 19mm mesh size is 100%. The basalt broken stone and the expanded perlite are preheated to 140 ℃, and the sepiolite fiber and the polyvinyl alcohol fiber are added to be dry-mixed for 25s, so that a dry-mixed mixture is obtained.
Step two: and (3) adding the modified asphalt and the warm mixing agent into the dry-mixed mixture obtained in the step one, mixing for 210s at 140 ℃, adding the mineral powder and the slaked lime, and mixing for 6min to obtain an asphalt mixture. The modified asphalt adopted in the embodiment is obtained in preparation example 1, the mineral powder adopted in the embodiment is blast furnace slag powder, the warm-mixing agent adopted in the embodiment is an EWMA warm-mixed asphalt additive of Shanghai Longfu material, and other materials are all common commercial products.
Example 2
The present embodiment is different from embodiment 1 mainly in that: the preparation method of the modified asphalt mixture of the embodiment comprises the following steps: the method comprises the following steps: weighing 8kg of modified asphalt, 50kg of basalt macadam, 30kg of quartzite macadam, 20kg of amphibole macadam, 15kg of mineral powder, 5kg of slaked lime, 6kg of warm-mix agent, 0.2kg of anti-stripping agent, 0.15kg of sepiolite fiber and 0.35kg of polyvinyl alcohol fiber. Wherein, the mixture of the basalt broken stone, the quartz broken stone and the amphibole broken stone is sieved together, the passing rate of a screen with 4.75mm sieve mesh is 33.8 percent, the passing rate of a screen with 9.5mm sieve mesh is 54.3 percent, the passing rate of a screen with 13.2mm sieve mesh is 87.5 percent, and the passing rate of a screen with 19mm sieve mesh is 100 percent. The basalt broken stone, the quartz broken stone and the amphibole broken stone are preheated to 145 ℃, and the anti-stripping agent, the sepiolite fiber and the polyvinyl alcohol fiber are added to be dry-mixed for 15s, so that a dry-mixed mixture is obtained.
Step two: and (3) adding the modified asphalt and the warm mixing agent into the dry-mixed mixture obtained in the step one, mixing for 150s at the temperature of 150 ℃, adding the mineral powder and the slaked lime, and mixing for 4min to obtain an asphalt mixture. The modified asphalt used in this example was obtained in preparation example 2, and the anti-stripping agent used in this example was YH-KBL anti-stripping agent for Yunhai Jia Luo.
Example 3
The present example differs from comparative example 1 mainly in that: the preparation method of the modified asphalt mixture of the embodiment comprises the following steps: the method comprises the following steps: 9kg of modified asphalt, 60kg of basalt macadam, 30kg of quartz macadam, 15kg of amphibole macadam, 15kg of mineral powder, 5kg of slaked lime, 5kg of sand, 4kg of warm-mix agent, 0.3kg of anti-stripping agent, 0.35kg of sepiolite fiber and 0.85kg of polyvinyl alcohol fiber are weighed. Wherein, the mixture of the basalt broken stone, the quartz broken stone and the amphibole broken stone is sieved together, the passing rate of a screen with 4.75mm sieve mesh is 31.7%, the passing rate of a screen with 9.5mm sieve mesh is 55.9%, the passing rate of a screen with 13.2mm sieve mesh is 88.6%, and the passing rate of a screen with 19mm sieve mesh is 100%. Preheating the basalt broken stone, the quartz broken stone and the amphibole broken stone to 143 ℃, adding the anti-stripping agent, the sepiolite fiber and the polyvinyl alcohol fiber, and performing dry mixing for 20s to obtain a dry mixing mixture.
Step two: and (3) adding the modified asphalt and the warm mixing agent into the dry mixing mixture obtained in the step one, mixing for 180s at 145 ℃, adding the mineral powder and the slaked lime, and mixing for 5min to obtain an asphalt mixture. The modified asphalt used in this example was obtained in preparation example 3, and the anti-stripping agent used in this example was YH-KBL anti-stripping agent for Yunhai Jia Luo.
Example 4
The present embodiment is different from embodiment 3 mainly in that: the raw materials adopted by the modified asphalt mixture of the embodiment are composed of 10kg of modified asphalt, 65kg of basalt broken stone, 30kg of quartz broken stone, 15kg of amphibole broken stone, 22kg of mineral powder, 8kg of slaked lime, 5kg of warm-mix agent, 0.5kg of anti-stripping agent, 0.5kg of sepiolite fiber and 1kg of polyvinyl alcohol fiber. Wherein, the mixture of the basalt broken stone, the quartz broken stone and the amphibole broken stone is sieved together, the passing rate of a screen with 4.75mm of sieve pore size is 32.4%, the passing rate of a screen with 9.5mm of sieve pore size is 56.3%, the passing rate of a screen with 13.2mm of sieve pore size is 86.8%, and the passing rate of a screen with 19mm of sieve pore size is 100%.
Example 5
The present embodiment is different from embodiment 3 mainly in that: the modified asphalt mixture of the embodiment adopts the raw materials consisting of 15kg of modified asphalt, 70kg of quartzite macadam, 50kg of ceramsite, 25kg of sand, 10kg of slaked lime, 7kg of warm mixing agent, 0.5kg of anti-stripping agent, 1kg of anti-aging agent, 0.8kg of sepiolite fiber and 0.7kg of polyvinyl alcohol fiber. Wherein, the mixture of the quartzite macadam and the ceramsite is sieved together, the passing rate of a screen with the mesh size of 4.75mm is 30.9 percent, the passing rate of a screen with the mesh size of 9.5mm is 53.6 percent, the passing rate of a screen with the mesh size of 13.2mm is 85.2 percent, and the passing rate of a screen with the mesh size of 19mm is 100 percent. The anti-aging agent used in this example was anti-aging agent GW-944.
Comparative example
Comparative example 1
The main difference between this comparative example and example 1 is that: the modified asphalt mixture of the comparative example is not added with a warm mixing agent.
Comparative example 2
The comparative example differs from example 1 mainly in that: in the modified asphalt mixture of the comparative example, sepiolite fibers were not added.
Comparative example 3
The comparative example differs from example 1 mainly in that: in the asphalt mixture of this comparative example, unmodified ordinary asphalt was used. Performance test
The asphalt used in examples 1 to 5 and comparative examples 1 to 3 and the resulting asphalt mixtures were tested according to the test protocol for road engineering asphalt and asphalt mixtures (JTJ052-2000), and the test results are shown in Table 1.
Table 1 results of testing the properties of modified asphalt and asphalt mixtures of examples and comparative examples
| Group of | Softening point/. degree.C | Void fraction/%) | Mineral material void fraction/%) | Asphalt saturation/% | Marshall stability/kN |
| Example 1 | 55 | 4.8 | 17.4 | 65.3 | 8.1 |
| Example 2 | 58 | 4.5 | 16.3 | 66.4 | 8.4 |
| Example 3 | 67 | 3.4 | 13.5 | 73.8 | 9.6 |
| Example 4 | 62 | 4.2 | 15.8 | 68.4 | 9.1 |
| Example 5 | 53 | 4.6 | 16.9 | 65.7 | 7.6 |
| Comparative example 1 | 50 | 6.3 | 22.5 | 54.7 | 6.2 |
| Comparative example 2 | 48 | 5.5 | 19.7 | 56.8 | 5.9 |
| Comparative example 3 | 41 | 4.5 | 21.4 | 53.7 | 6.5 |
As can be seen from Table 1, the performance test results of the examples meet the relevant standards, while in the case of the comparative example 1 without adding a warm mixing agent, the asphalt mixture prepared at the stirring temperature has poor stirring effect, and both the mineral aggregate void ratio and the asphalt saturation degree can not meet the standard requirements; comparative example 2 asphalt mixture without sepiolite fiber, the material mixing uniformity was poor, the measured void ratio was large, and the marshall stability was too small; the comparative example 3 adopts unmodified common asphalt, the interaction of the common asphalt, the warm-mixing agent and the stabilizing agent is relatively poor, and the performance detection result is obviously different from that of each example.
The dynamic stability of the asphalt mixtures prepared in the examples and the comparative examples is detected according to an asphalt mixture rut test (T0719-1993), wherein the detection condition is 60 +/-1 ℃, and the pressure of a test wheel is 0.7 +/-0.05 MPa; the water stability of the asphalt mixtures obtained in the examples and comparative examples was examined according to the test procedure for asphalt and asphalt mixtures (T0729-2000). The results are shown in Table 2.
TABLE 2 results of measuring dynamic stability and water stability of each example and comparative example
As can be seen from Table 2, the dynamic stability and the water stability of each example are obviously superior to those of the asphalt mixture prepared in each proportion, and the diseases such as rutting and the like can be effectively reduced. Among them, examples 2 to 4 are superior to examples 1 and 5 in dynamic stability and water stability, and it was confirmed that the ratio of the sepiolite fibers to the polyvinyl alcohol fibers was 1: and (2) within the range of (3), the stabilizer has the best stabilizing effect on the modified asphalt mixture. The dynamic stability and the water stability of the examples 3 and 4 are superior to those of the example 2, and the dosage ratio of the modified asphalt, the warm-mixing agent and the stabilizer is proved to be (2-3): 1: the compound effect is better within the range of (0.3-0.5). The dynamic stability and water stability of example 3 are also better than example 4, demonstrating that the modifier employs high density polyethylene and ethylene-vinyl acetate copolymer, and the amounts of both are in the range of 1: and (1.5-3), the compounding effect of the modified asphalt, the warm mixing agent and the stabilizer is better. According to the invention, the asphalt is modified, and the warm mixing agent and the stabilizer are added, so that the durable asphalt pavement with compact structure, strong pressure resistance and difficult disease generation is successfully prepared under the condition of reducing the preparation temperature of the modified asphalt mixture.
The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present invention.
Claims (5)
1. The modified asphalt mixture is characterized by being prepared from the following raw materials in parts by weight: 6-15 parts of modified asphalt, 95-120 parts of aggregate, 18-30 parts of filler, 3-7 parts of warm mixing agent and 0.5-3 parts of auxiliary agent;
the modified asphalt comprises base asphalt and a modifier, wherein the modifier comprises high-density polyethylene and an ethylene-vinyl acetate copolymer, and the mass ratio of the high-density polyethylene to the ethylene-vinyl acetate copolymer is 1: (1.5-3); the addition amount of the modifier is 4-6% of the mass of the matrix asphalt;
the aggregate comprises at least one of crushed stone, expanded perlite and ceramsite;
the filler comprises at least one of mineral powder, slaked lime and sand;
the auxiliary agent comprises a stabilizer, and the auxiliary agent also comprises at least one of a stripping resistant agent and an anti-aging agent; the mass ratio of the modified asphalt to the warm mixing agent to the stabilizer is (2-3): 1: (0.3 to 0.5); the stabilizer comprises sepiolite fibers and polyvinyl alcohol fibers, wherein the mass ratio of the sepiolite fibers to the polyvinyl alcohol fibers is 1: (2-3);
in the aggregate, materials with the particle size of 0-5 mm account for 25-35% of the total amount of the aggregate, materials with the particle size of 5-10 mm account for 20-25% of the total amount of the aggregate, materials with the particle size of 10-15 mm account for 26-35% of the total amount of the aggregate, and materials with the particle size of 15-20 mm account for 8-15% of the total amount of the aggregate.
2. The modified asphalt mixture according to claim 1, wherein the mixture is prepared from the following raw materials in parts by weight: 8-10 parts of modified asphalt, 100-110 parts of aggregate, 20-35 parts of filler, 3-5 parts of warm mixing agent, 0.2-0.5 part of anti-stripping agent and 0.5-1.5 parts of stabilizer.
3. The modified asphalt mixture as claimed in claim 1, wherein said crushed stone comprises at least one of basalt crushed stone, quartzite crushed stone, and amphibole crushed stone.
4. A method of preparing a modified asphalt mixture according to any one of claims 1 to 3, comprising the steps of:
the method comprises the following steps: weighing the materials according to the formula proportion, preheating the aggregate to 140-145 ℃, adding an auxiliary agent, and dry-mixing for 15-25 s to obtain a dry-mixed mixture;
step two: and adding the modified asphalt and the warm mixing agent into the dry mixing mixture, mixing for 150-210 s at 140-150 ℃, adding the filler, and mixing for 4-6 min to obtain the asphalt mixture.
5. The method for preparing a modified asphalt mixture according to claim 4, wherein the modified asphalt is prepared by the following steps: preheating the matrix asphalt to 160-165 ℃, adding the modifier into the matrix asphalt, keeping the temperature at 160-170 ℃ for 10-15 min, shearing the mixture of the matrix asphalt and the modifier at a high speed of 4000rpm for 0.8-1.5 h, and obtaining the modified asphalt after shearing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811225284.9A CN109293281B (en) | 2018-10-20 | 2018-10-20 | Modified asphalt mixture and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201811225284.9A CN109293281B (en) | 2018-10-20 | 2018-10-20 | Modified asphalt mixture and preparation method thereof |
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| CN113003985A (en) * | 2021-04-08 | 2021-06-22 | 广西交科集团有限公司 | Preparation method of anti-cracking rock rubber powder composite modified asphalt mixture |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101445338A (en) * | 2008-11-27 | 2009-06-03 | 武汉理工大学 | Method for producing wet-mixing, skid-resistance and noise-reduction asphalt road surface material |
| CN101475351A (en) * | 2009-01-20 | 2009-07-08 | 钦兰成 | Cold mixing high polymer modified asphalt concrete and preparing method thereof |
| CN103739239A (en) * | 2013-12-31 | 2014-04-23 | 长安大学 | Composite fiber material used in mixed asphalt material |
| CN103803829A (en) * | 2013-12-31 | 2014-05-21 | 长安大学 | Complex fibers for asphalt concrete |
| KR101600030B1 (en) * | 2015-09-07 | 2016-03-08 | 케이지포장건설(주) | Salt-resistant asphalt modifier composition and salt-resistant modified asphalt mixture comprising the same and salt-resistant modified asphalt concrete comprising the same and manufacturing method thereof |
-
2018
- 2018-10-20 CN CN201811225284.9A patent/CN109293281B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101445338A (en) * | 2008-11-27 | 2009-06-03 | 武汉理工大学 | Method for producing wet-mixing, skid-resistance and noise-reduction asphalt road surface material |
| CN101475351A (en) * | 2009-01-20 | 2009-07-08 | 钦兰成 | Cold mixing high polymer modified asphalt concrete and preparing method thereof |
| CN103739239A (en) * | 2013-12-31 | 2014-04-23 | 长安大学 | Composite fiber material used in mixed asphalt material |
| CN103803829A (en) * | 2013-12-31 | 2014-05-21 | 长安大学 | Complex fibers for asphalt concrete |
| KR101600030B1 (en) * | 2015-09-07 | 2016-03-08 | 케이지포장건설(주) | Salt-resistant asphalt modifier composition and salt-resistant modified asphalt mixture comprising the same and salt-resistant modified asphalt concrete comprising the same and manufacturing method thereof |
Non-Patent Citations (1)
| Title |
|---|
| Evotherm温拌SMA在公路养护中的应用;孙艳华 等;《湖南交通科技》;20121231;第38卷(第4期);第11-14页 * |
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