CN111153634B - Noise-reducing rubber modified asphalt concrete and preparation method thereof - Google Patents

Noise-reducing rubber modified asphalt concrete and preparation method thereof Download PDF

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CN111153634B
CN111153634B CN202010023708.4A CN202010023708A CN111153634B CN 111153634 B CN111153634 B CN 111153634B CN 202010023708 A CN202010023708 A CN 202010023708A CN 111153634 B CN111153634 B CN 111153634B
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modified asphalt
powder
rubber
noise
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CN111153634A (en
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秦可畏
关晓芳
向波
冯赢
吴晨晨
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Jiangsu Zhongxin Sutong Municipal Engineering Co ltd
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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
    • 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
    • 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
    • C04B20/02—Treatment
    • C04B20/023—Chemical treatment
    • 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
    • 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
    • C04B20/02—Treatment
    • C04B20/04—Heat treatment
    • 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
    • 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
    • C04B2111/20—Resistance against chemical, physical or biological attack
    • 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
    • C04B2111/52—Sound-insulating materials

Abstract

The invention discloses noise-reducing rubber modified asphalt concrete and a preparation method thereof, relating to the technical field of asphalt concrete, and the key point of the technical scheme is that the noise-reducing rubber modified asphalt concrete comprises the following components in parts by weight: 80-90 parts of coarse aggregate, 20-30 parts of fine aggregate, 4-6 parts of noise reduction filler and 8-12 parts of rubber modified asphalt; the coarse aggregate is formed by mixing basalt broken stones, ceramsite and zeolite in a weight ratio of 4:1: 1; the fine aggregate is formed by mixing river sand and ceramic sand in a weight ratio of 3: 1; the noise reduction filler is formed by mixing sericite powder and montmorillonite. The asphalt concrete has the advantages of good noise reduction effect and long service life.

Description

Noise-reducing rubber modified asphalt concrete and preparation method thereof
Technical Field
The invention relates to the technical field of asphalt concrete, in particular to noise-reducing rubber modified asphalt concrete and a preparation method thereof.
Background
The asphalt concrete is a mixture prepared by manually selecting mineral aggregate (crushed stone or crushed gravel, stone chips or sand, mineral powder and the like) with a certain gradation composition and a certain proportion of road asphalt material on a pavement with the asphalt concrete as a surface layer under strictly controlled conditions. As the traffic flow and the driving frequency of modern highways and roads are increased rapidly, the road load is increased gradually, and a severe challenge is also provided for the performance of the roads, people continuously research road materials with better performance; the modified asphalt is an asphalt binder prepared by adding external additives (modifiers) such as rubber, resin, high molecular polymer, ground rubber powder or other fillers or by adopting measures such as mild oxidation processing of the asphalt and the like, so that the performance of the asphalt or the asphalt mixture is improved. The rubber asphalt is one of modified asphalt, has the performances of high-temperature stability, low-temperature flexibility, ageing resistance, fatigue resistance, water damage resistance and the like, is an ideal environment-friendly pavement material, and is mainly applied to a stress absorption layer and a surface layer in a road structure.
In the prior art, patent application publication No. CN103980724A discloses a method for preparing rubber modified asphalt, which comprises the following steps: adding rubber powder and a compatilizer into the heated matrix asphalt, stirring, and then introducing the mixture into a colloid mill for shearing; and (4) after shearing, guiding the semi-finished product into a development tank, adding a stabilizer, stirring for 15-18min, and guiding the semi-finished product into a finished product tank for development to obtain the rubber modified asphalt.
In urban roads, because of the improvement of the speed of a vehicle and the increase of the traffic flow, the influence of traffic noise is increasingly serious, and although rubber modified asphalt can play a certain noise reduction effect compared with a common asphalt road, the noise reduction effect of the traditional rubber modified asphalt can be reduced by only 2-4 decibels at present, the sound of a road where a normal automobile shuttles is generally 85 decibels, for residents living near the road, although a wall body and glass can play a certain sound insulation effect, the sound insulation effect is limited, and when the sound exceeds 50 decibels, the sleep and rest of people can be influenced, so that the fundamental reduction of the noise on the road is a key method for solving the problem of disturbing residents by the noise; and as the service life of the road is prolonged, the rubber or asphalt on the surface of the road is worn, so that the aggregates are exposed, and the noise problem is also aggravated. Accordingly, there is a need for an asphalt concrete that can reduce noise and has durability.
Disclosure of Invention
Aiming at the defects in the prior art, the first purpose of the invention is to provide the noise-reducing rubber modified asphalt concrete which has the advantages of good noise-reducing effect and long service life.
The second purpose of the invention is to provide a preparation method of the noise-reducing rubber modified asphalt concrete, which has the advantages of simple processing and easy operation.
In order to achieve the first object, the invention provides the following technical scheme: the noise-reducing rubber modified asphalt concrete comprises the following components in parts by weight: 80-90 parts of coarse aggregate, 20-30 parts of fine aggregate, 4-6 parts of noise reduction filler and 8-12 parts of rubber modified asphalt; the coarse aggregate is formed by mixing basalt broken stones, ceramsite and zeolite in a weight ratio of 4:1: 1; the fine aggregate is formed by mixing river sand and ceramic sand in a weight ratio of 3: 1; the noise reduction filler is formed by mixing sericite powder and montmorillonite.
By adopting the technical scheme, the rubber powder added in the rubber modified asphalt has good elasticity, the damping effect of a pavement material can be increased, and the energy of sound waves and vibration waves is weakened, so that the noise of the pavement is reduced; the basalt broken stone, the ceramsite, the ceramic sand and the zeolite belong to porous aggregates, have a good effect of absorbing noise, and the basalt broken stone and the river sand can keep the required compressive strength, so that the aggregates can absorb the noise of a road surface while providing strength; sericite is one of mica, belongs to silicate mineral substances with a layered structure, montmorillonite is a layered mineral composed of superfine water-containing aluminosilicate particles, when sound waves and shock waves are transmitted on a concrete pavement, the shock waves and the sound waves can be repeatedly reflected between a mica wafer and an interlayer structure of the montmorillonite, so that the shock energy of the mica wafer is weakened, the effects of absorbing the shock energy and weakening the shock waves and the sound waves are achieved, and the noise is reduced; in addition, through the matching of the rubber modified asphalt, the coarse aggregate, the fine aggregate and the noise reduction filler, the coarse aggregate and the fine aggregate are built into a framework, and gaps of the framework are filled through the noise reduction filler and the rubber modified asphalt, so that the compactness among the mixtures can be enhanced, and the load bearing capacity of the asphalt concrete is improved.
Further, the particle size of the basalt broken stone is 10-16mm, the particle size of the ceramsite is 5-10mm, and the particle size of the zeolite is 5-10 mm; the average grain diameter of the river sand is 0.5-0.25mm, and the average grain diameter of the pottery sand is 2-4 mm.
By adopting the technical scheme, the basalt macadam, the ceramsite and the zeolite have different grain sizes, and aggregates with different grades can be built into a firm framework, so that the noise of a pavement product is reduced while necessary bearing load is provided for asphalt concrete.
Further, the rubber modified asphalt comprises the following raw materials in parts by weight: 100 parts of matrix asphalt, 5-10 parts of waste rubber powder, 3-5 parts of lignin fiber, 2-4 parts of modified sericite powder, 1-2 parts of tackifier and 0.8-1 part of antioxidant.
By adopting the technical scheme, the matrix asphalt is modified by the waste rubber powder, the lignin fiber, the modified sericite powder and the tackifier, so that on one hand, the effects of reinforcement and cementation can be achieved, a cross-linked net is formed in the matrix asphalt, the bonding strength of the matrix asphalt and the aggregate is improved, and the load bearing capacity of the asphalt concrete is improved, so that the durability of the asphalt concrete is improved, and the noise problem caused by exposed aggregate in the using process is reduced; on the other hand, the asphalt is modified, the noise reduction effect of the rubber modified asphalt can be improved through the matching of the elastic waste rubber powder, the lignin fiber forming the three-dimensional network structure and the modified sericite powder with the noise reduction and noise reduction effects, and the noise reduction capability of the rubber modified asphalt can be further improved through the matching of the rubber modified asphalt, the coarse aggregate with the noise reduction effect, the fine aggregate and the noise reduction aggregate.
Further, the modified sericite powder is prepared by adopting the following method: firstly, grinding and sieving sericite to obtain sericite powder;
calcining the sericite powder for 2-3h at the temperature of 300-400 ℃ to obtain calcined sericite powder;
and thirdly, adding a modifier accounting for 20-25% of the weight of the calcined sericite powder, stirring at the temperature of 100-120 ℃ for 1-2h, drying, crushing and sieving to obtain the modified sericite powder.
By adopting the technical scheme, under the high-temperature condition, the rubber powder absorbs organic matters such as resin, hydrocarbon and the like in the asphalt to enable the rubber powder to be wet, expanded and increased in viscosity, so that the elasticity, softening point, adhesiveness, high-temperature stability and low-temperature crack resistance of the matrix asphalt can be improved, but the fluidity of the rubber modified asphalt is reduced, the difficulty of uniformly mixing the rubber modified asphalt with aggregate and filler is increased, and the workability of the rubber modified asphalt in the aggregate mixing process can be improved by adding the modified sericite powder, and the durability and the noise reduction effect of asphalt concrete can also be improved after the rubber modified asphalt is cooled.
Further, the modifier comprises the following components in parts by weight: 10-15 parts of alumina powder, 1-2 parts of calcium stearate, 4-6 parts of hydroxypropyl methyl cellulose, 2-4 parts of stearic amide, 3-5 parts of hydroxyethyl methacrylate, 1-2 parts of a silane coupling agent, 2-3 parts of N-methyl pyrrolidone and 100 parts of 50-95% ethanol solution in parts by volume.
By adopting the technical scheme, the alumina powder has the advantages of high hardness and good wear resistance, is mixed with calcium stearate, hydroxypropyl methylcellulose, stearic acid amide, hydroxyethyl methacrylate, a silane coupling agent and N-methyl pyrrolidone, and is modified by using an ethanol solution as a solvent, so that the calcined sericite powder is modified by using the obtained modifier, the noise reduction capability of the rubber modified asphalt can be improved by using the specific layered structure of the sericite, the modified sericite powder obtained after modification has good compatibility with rubber powder, the difficulty in mixing the rubber modified asphalt and aggregate is increased due to the fact that the rubber has large viscoelasticity, and the processability of the rubber modified asphalt can be improved and the operation time can be shortened by adding the modified sericite powder.
Further, the modifier is prepared by adopting the following method: taking 10-15 parts by weight of alumina powder and 50 parts by volume of 50-95% ethanol solution, and grinding for 10-20min to obtain ethanol suspension of the alumina powder; adding 1-2 parts of calcium stearate, 4-6 parts of hydroxypropyl methyl cellulose, 2-4 parts of stearic amide, 3-5 parts of hydroxyethyl methacrylate, 1-2 parts of silane coupling agent and 2-3 parts of N-methyl pyrrolidone into an ethanol suspension of alumina powder, stirring at the speed of 1000-2000r/min for 30-50min, adding 50 parts of ethanol solution with the volume fraction of 50%, heating to 80-90 ℃, and stirring for 1-2h under heat preservation to obtain the modifier.
Further, the tackifier is one of terpene resin and rosin resin.
By adopting the technical scheme, the terpene resin and the rosin resin are used as the tackifier, so that the adhesiveness of the rubber modified asphalt can be improved, and the bonding strength between the rubber modified asphalt and the aggregate is improved.
Further, the rubber modified asphalt is prepared by adopting the following method: heating the matrix asphalt to 180-.
By adopting the technical scheme, the matrix asphalt, the waste rubber powder and the modified sericite powder are mixed at a high temperature, rubber swells in the asphalt at the high temperature, and meanwhile, the added modified sericite powder can improve the dispersibility of the rubber powder in the matrix asphalt, improve the mixing uniformity of the rubber powder, the lignin fiber, the tackifier and the antioxidant and improve the bonding strength of the rubber modified asphalt and the aggregate.
In order to achieve the second object, the invention provides the following technical scheme: a preparation method of noise-reducing rubber modified asphalt concrete comprises the following steps: heating 8-12 parts by weight of rubber modified asphalt to 180 ℃ of 160-.
In summary, compared with the prior art, the invention has the following beneficial effects:
1. the rubber powder added in the rubber modified asphalt has good elasticity, can increase the damping effect of a pavement material and weaken the energy of sound waves and vibration waves, thereby reducing the noise of the pavement; the porous aggregate and the filler with the damping function can absorb vibration energy and weaken vibration waves and sound waves, so that the noise is reduced; in addition, through the matching of the rubber modified asphalt, the coarse aggregate, the fine aggregate and the noise reduction filler, the coarse aggregate and the fine aggregate are built into a framework, and gaps of the framework are filled through the noise reduction filler and the rubber modified asphalt, so that the compactness among the mixtures can be enhanced, and the load bearing capacity of the asphalt concrete is improved;
2. the matrix asphalt is modified by the waste rubber powder, the lignin fiber, the modified sericite powder and the tackifier, so that on one hand, the effects of reinforcement and cementation can be achieved, a cross-linked net is formed in the matrix asphalt, the bonding strength of the matrix asphalt and the aggregate is improved, and the load bearing capacity of the asphalt concrete is improved, so that the durability of the asphalt concrete is improved, and the noise problem caused by exposure of the aggregate in the using process is reduced; on the other hand, the asphalt is modified, the noise reduction effect of the rubber modified asphalt can be improved through the matching of the elastic waste rubber powder, the lignin fiber forming the three-dimensional network structure and the modified sericite powder with the noise reduction and noise reduction effects, and the noise reduction capability of the rubber modified asphalt can be further improved through the matching of the rubber modified asphalt, the coarse aggregate with the noise reduction effect, the fine aggregate and the noise reduction aggregate;
3. under the high-temperature condition, the rubber powder absorbs organic matters such as resin, hydrocarbon and the like in the asphalt to enable the rubber powder to be wet, expanded and increased in viscosity, so that the elasticity, softening point, adhesiveness, high-temperature stability and low-temperature crack resistance of the matrix asphalt can be improved, but the fluidity of the rubber modified asphalt is reduced, the difficulty in uniformly mixing the rubber modified asphalt with aggregate and filler is increased, and the workability of the rubber modified asphalt in the aggregate mixing process can be improved, and the durability and the noise reduction effect of asphalt concrete can also be improved after the rubber modified asphalt is cooled by adding the modified sericite powder.
Detailed Description
The present invention will be described in further detail below.
Preparation of modified sericite powder hydroxypropyl methylcellulose in the following preparation examples is selected from hydroxypropyl methylcellulose provided by Nanjing pine crown Biotech Co., Ltd; the hydroxyethyl methacrylate is selected from hydroxyethyl methacrylate with content of 95% or more provided by Mitsubishi.
Preparation example 1 of modified sericite powder: firstly, grinding sericite and sieving the ground sericite with a 200-mesh sieve to obtain sericite powder;
calcining the sericite powder for 2 hours at the temperature of 300 ℃ to obtain calcined sericite powder;
thirdly, 10kg of alumina powder and 50kg of ethanol solution with 50 percent of volume fraction are ground at the speed of 100r/min for 10min to obtain ethanol suspension of the alumina powder; adding 1kg of calcium stearate, 4kg of hydroxypropyl methyl cellulose, 2kg of stearic acid amide, 3kg of hydroxyethyl methacrylate, KH-5501 kg of silane coupling agent and 2kg of N-methyl pyrrolidone into an ethanol suspension of alumina powder, stirring at the speed of 1000r/min for 30min, adding 50kg of ethanol solution with the volume fraction of 50%, heating to 80 ℃, and stirring for 1h under heat preservation to obtain a modifier;
adding 22 wt% of modifier into the calcined sericite powder, stirring at 100 ℃ for 1h at high temperature, drying at 120 ℃ for 5h, crushing, and sieving with a 200-mesh sieve to obtain the modified sericite powder.
Preparation example 2 of modified sericite powder: firstly, grinding sericite and sieving the ground sericite with a 200-mesh sieve to obtain sericite powder;
calcining the sericite powder for 2.5 hours at the temperature of 350 ℃ to obtain calcined sericite powder;
③ taking 12.5kg of alumina powder and 50kg of ethanol solution with 75 percent of volume fraction, and grinding for 15min at the speed of 100r/min to obtain ethanol suspension of the alumina powder; adding 1.5kg of calcium stearate, 5kg of hydroxypropyl methyl cellulose, 3kg of stearic acid amide, 4kg of hydroxyethyl methacrylate, KH-5501.5 kg of silane coupling agent and 2.5kg of N-methyl pyrrolidone into an ethanol suspension of alumina powder, stirring at the speed of 1500r/min for 40min, adding 50kg of ethanol solution with the volume fraction of 50%, heating to 85 ℃, and stirring for 1.5h under the condition of heat preservation to obtain a modifier;
adding 22.5 wt% of modifier into the calcined sericite powder, stirring at 110 ℃ for 1.5h at high temperature, drying at 120 ℃ for 5h, crushing, and sieving with a 200-mesh sieve to obtain the modified sericite powder.
Preparation example 3 of modified sericite powder: firstly, grinding sericite and sieving the ground sericite with a 200-mesh sieve to obtain sericite powder;
calcining the sericite powder for 3 hours at the temperature of 400 ℃ to obtain calcined sericite powder;
thirdly, 15kg of alumina powder and 50kg of ethanol solution with the volume fraction of 95 percent are ground at the speed of 100r/min for 20min to obtain ethanol suspension of the alumina powder; adding 2kg of calcium stearate, 6kg of hydroxypropyl methyl cellulose, 4kg of stearic acid amide, 5kg of hydroxyethyl methacrylate, KH-5502 kg of silane coupling agent and 3kg of N-methyl pyrrolidone into an ethanol suspension of alumina powder, stirring at the speed of 2000r/min for 50min, adding 50kg of ethanol solution with the volume fraction of 50%, heating to 90 ℃, preserving heat and stirring for 2h to obtain a modifier;
adding 25% of modifier by weight into the calcined sericite powder, stirring at 120 ℃ for 2h at high temperature, drying at 120 ℃ for 5h, crushing, and sieving with a 200-mesh sieve to obtain the modified sericite powder.
Preparation example 4 of modified sericite powder: the difference between this preparation example and preparation example 1 of modified sericite powder is that the calcined sericite powder is not subjected to the modification treatment of step (iv).
Preparation example 5 of modified sericite powder: the difference between the preparation example and the preparation example 1 of modified sericite powder is that the modifier in the third step is only silane coupling agent KH-550.
Preparation examples of rubber-modified asphalt the waste rubber powder in the following preparation examples was selected from automobile waste tire tread rubber powder provided by Hebei Benge mineral products Co., Ltd., and the average particle diameter thereof was 0.180 to 0.075 mm; the substrate cleaning is selected from asphalt with model number AH-70 provided by Dongming petrochemical industry; the lignin fiber is selected from lignin fiber provided by the salt city strength fiber science and technology company, and the model is JSL-A006; the terpene resin is selected from terpene resins with a model number of T-1105 provided by Zhengzhou Hengtong chemical Co., Ltd; the rosin resin is selected from the rosin resin with the model number of RC-100 provided by Nanjing Kaiyin materials science and technology company Limited; antioxidant 1010 is provided by basf.
Preparation example 1 of rubber-modified asphalt: 100kg of matrix asphalt is heated to 180 ℃, 5kg of waste rubber powder and 2kg of modified sericite powder (selected from preparation example 1 of modified sericite powder) are added, stirring is carried out for 30min at the speed of 3000r/min, 3kg of lignin fiber, 1kg of terpene resin, rosin resin and 0.8kg of antioxidant 1010 are added, and heat preservation stirring is carried out for 1h at the temperature of 170 ℃ at the speed of 3000r/min, so that the rubber modified asphalt is obtained.
Preparation example 2 of rubber-modified asphalt: 100kg of matrix asphalt is heated to 190 ℃, 7.5kg of waste rubber powder and 3kg of modified sericite powder (selected from the preparation example 2 of the modified sericite powder) are added, after stirring is carried out for 35min at the speed of 3500r/min, 4kg of lignin fiber, 1.5kg of terpene resin, rosin resin and 0.9kg of antioxidant 1010 are added, and the mixture is stirred at the temperature of 175 ℃ and the heat preservation speed of 30500r/min for 1.5h, so as to obtain the rubber modified asphalt.
Preparation example 3 of rubber-modified asphalt: 100kg of matrix asphalt is heated to 200 ℃, 10kg of waste rubber powder and 4kg of modified sericite powder (selected from the preparation example 3 of the modified sericite powder) are added, stirring is carried out for 40min at the speed of 4000r/min, 5kg of lignin fiber, 2kg of terpene resin, rosin resin and 1kg of antioxidant 1010 are added, and stirring is carried out at the temperature of 180 ℃ for 2h at the speed of 4000r/min to obtain the rubber modified asphalt.
Preparation example 4 of rubber-modified asphalt: the difference between this preparation example and the rubber-modified asphalt preparation example 1 is that no modified sericite powder and no lignin fiber were added.
Preparation example 5 of rubber-modified asphalt: the difference between the preparation example and the preparation example 1 of the rubber modified asphalt is that the modified sericite powder is prepared from the preparation example 4 of the modified sericite powder.
Preparation example 6 of rubber-modified asphalt: the difference between the preparation example and the preparation example 1 of the rubber modified asphalt is that the modified sericite powder is prepared from the preparation example 5 of the modified sericite powder.
Examples
The coarse aggregate in the following examples is formed by mixing basalt broken stone, ceramsite and zeolite in a weight ratio of 4:1: 1; the particle size of the basalt macadam is 10-16mm, the particle size of the ceramsite is 5-10mm, and the particle size of the zeolite is 5-10 mm; the fine aggregate is formed by mixing river sand and ceramic sand in a weight ratio of 3: 1; the noise reduction filler is formed by mixing sericite powder and montmorillonite in a weight ratio of 1: 1; the average grain diameter of river sand is 0.5-0.25mm, and the average grain diameter of pottery sand is 2-4 mm.
Example 1: the noise-reducing rubber modified concrete is prepared by adopting the following method:
heating 8kg of rubber modified asphalt (selected from preparation example 1 of rubber modified asphalt) to 160 ℃, adding 4kg of noise reduction filler, stirring at the speed of 200r/min for 10min, then adding 20kg of fine aggregate and 80kg of coarse aggregate, and uniformly stirring.
Example 2: the noise-reducing rubber modified concrete is prepared by adopting the following method:
heating 10kg of rubber modified asphalt (selected from preparation example 2 of rubber modified asphalt) to 170 ℃, adding 5kg of noise reduction filler, stirring at the speed of 200r/min for 12min, then adding 25kg of fine aggregate and 85kg of coarse aggregate, and uniformly stirring.
Example 3: the noise-reducing rubber modified concrete is prepared by adopting the following method:
heating 12kg of rubber modified asphalt (selected from preparation example 3 of rubber modified asphalt) to 180 ℃, adding 6kg of noise reduction filler, stirring at the speed of 200r/min for 15min, then adding 30kg of fine aggregate and 90kg of coarse aggregate, and stirring uniformly.
Comparative example
Comparative example 1: this comparative example is different from example 1 in that the rubber-modified asphalt is selected from the rubber-modified asphalt prepared in preparation example 4.
Comparative example 2: this comparative example is different from example 1 in that the rubber-modified asphalt is selected from the rubber-modified asphalt prepared in preparation example 5.
Comparative example 3: this comparative example is different from example 1 in that the rubber-modified asphalt is selected from the group consisting of those prepared in preparation example 6.
Comparative example 4: this comparative example differs from example 1 in that no noise reducing filler was added to the raw materials.
Comparative example 5: this comparative example differs from example 1 in that the coarse aggregate is only ceramsite and zeolite.
Performance testing
The properties of the rubber-modified asphalt obtained in examples 1 to 3 were measured by the method described in JTGE20-2011 test protocols for road asphalt and asphalt mixtures, and the results are shown in Table 1.
TABLE 1
Figure BDA0002361699420000071
Figure BDA0002361699420000081
The penetration index is an index for describing the temperature sensitivity of the asphalt, and the larger the penetration index is, the smaller the temperature sensitivity of the asphalt is; the ductility of the asphalt refers to the ductility of the asphalt, and the higher the ductility is, the better the plasticity of the surface asphalt is; according to the data in table 1, the rubber modified asphalt prepared by the invention has lower temperature sensitivity, good plasticity, deformation resistance, toughness and ageing resistance.
Asphalt concretes were prepared by the methods of examples 1 to 3 and comparative examples 1 to 5, and their properties were measured as follows, and the results are shown in Table 2. Testing the basic performance of the asphalt mixture according to a method in JTGE20-2011 test specification of road engineering asphalt and asphalt mixture; preparing a standard Marshall test piece according to JTGF40-2004 technical Specification for construction of road asphalt pavement, and measuring the sound absorption coefficient according to GBJ47-85 Specification for measuring the sound absorption coefficient and the specific acoustic impedance by a standing wave tube method.
TABLE 2
Figure BDA0002361699420000082
The value of the sound absorption coefficient alpha is between 0 and 1, when alpha is 0, the sound energy is totally reflected, and the material does not absorb sound; when alpha is 1, the material absorbs all sound energy and does not reflect; the larger the value of the sound absorption coefficient alpha, the better the sound absorption performance of the material, the material with alpha above 0.2 is called sound absorption material, and the material with alpha above 0.5 is ideal sound absorption material.
The marshall stability, rut dynamic stability, soaking residual stability, and fatigue life are used to characterize the service life of the asphalt pavement, and according to the data in table 2, the asphalt concrete of examples 1-3 has good sound absorption and noise reduction capabilities.
The rubber modified asphalt of comparative example 1 was prepared from the rubber modified asphalt of preparation example 4, in which modified sericite powder and lignin fiber were not added; compared with the example 1, the service life and the sound absorption coefficient of the asphalt concrete in the comparative example 1 are obviously reduced, which shows that the durability and the noise reduction capability of the rubber modified asphalt can be obviously improved by adding the modified sericite powder and the lignin fiber.
The rubber modified asphalt of comparative example 2 was selected from that prepared in preparation example 5 of rubber modified asphalt, in which the modified sericite powder was not subjected to modification treatment; the rubber modified asphalt of comparative example 3 was prepared from preparation example 6 of rubber modified asphalt, in which the modifier of the modified sericite powder was only silane coupling agent KH-550 during modification treatment; compared with the asphalt concrete prepared in the example 1, the asphalt concrete prepared in the comparative example 2 and the asphalt concrete prepared in the comparative example 3, the service life and the sound absorption coefficient of the asphalt concrete are obviously reduced, which shows that the modified sericite powder treated by the method of the invention can obviously improve the durability and the noise reduction capability of the rubber modified asphalt.
The noise reducing filler is not added to the raw materials of the comparative example 4; compared with the example 1, the sound absorption coefficient of the comparative example 4 is obviously reduced, which shows that the noise reduction capability of the asphalt concrete can be obviously improved by adding the noise reduction filler; the coarse aggregate of comparative example 5 was only ceramsite and zeolite; compared with example 1, the asphalt concrete of comparative example 5 has a reduced life and a slightly improved sound absorption coefficient, which shows that when basalt macadam, ceramsite and zeolite are used together, the asphalt concrete has a good noise reduction capability and can obviously improve the service life of the asphalt concrete.
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 (6)

1. The noise-reducing rubber modified asphalt concrete is characterized in that: the paint comprises the following components in parts by weight:
80-90 parts of coarse aggregate, 20-30 parts of fine aggregate, 6-8 parts of noise reduction filler and 8-12 parts of rubber modified asphalt;
the coarse aggregate is formed by mixing basalt broken stones, ceramsite and zeolite in a weight ratio of 4:1: 1;
the fine aggregate is formed by mixing river sand and ceramic sand in a weight ratio of 3: 1;
the noise reduction filler is formed by mixing sericite powder and montmorillonite;
the rubber modified asphalt comprises the following raw materials in parts by weight: 100 parts of matrix asphalt, 5-10 parts of waste rubber powder, 3-5 parts of lignin fiber, 2-4 parts of modified sericite powder, 1-2 parts of tackifier and 0.8-1 part of antioxidant;
the modified sericite powder is prepared by the following method: firstly, grinding and sieving sericite to obtain sericite powder; calcining the sericite powder for 2-3h at the temperature of 300-400 ℃ to obtain calcined sericite powder; thirdly, adding a modifier accounting for 20-25 percent of the weight of the calcined sericite powder into the calcined sericite powder, stirring the mixture at the temperature of 100 ℃ and 120 ℃ for 1-2 hours at high temperature, and drying, crushing and sieving the mixture to obtain modified sericite powder;
the modifier comprises the following components in parts by weight: 10-15 parts of alumina powder, 1-2 parts of calcium stearate, 4-6 parts of hydroxypropyl methyl cellulose, 2-4 parts of stearic amide, 3-5 parts of hydroxyethyl methacrylate, 1-2 parts of a silane coupling agent, 2-3 parts of N-methyl pyrrolidone and 100 parts of 50-95% ethanol solution in parts by volume.
2. The noise-reducing rubber-modified asphalt concrete according to claim 1, wherein: the particle size of the basalt broken stone is 10-16mm, the particle size of the ceramsite is 5-10mm, and the particle size of the zeolite is 5-10 mm;
the average grain diameter of the river sand is 0.5-0.25mm, and the average grain diameter of the pottery sand is 2-4 mm.
3. The noise-reducing rubber-modified asphalt concrete according to claim 1, wherein: the modifier is prepared by adopting the following method: taking 10-15 parts by weight of alumina powder and 50 parts by volume of 50-95% ethanol solution, and grinding for 10-20min to obtain ethanol suspension of the alumina powder; adding 1-2 parts of calcium stearate, 4-6 parts of hydroxypropyl methyl cellulose, 2-4 parts of stearic amide, 3-5 parts of hydroxyethyl methacrylate, 1-2 parts of silane coupling agent and 2-3 parts of N-methyl pyrrolidone into an ethanol suspension of alumina powder, stirring at the speed of 1000-2000r/min for 30-50min, adding 50 parts of ethanol solution with the volume fraction of 50%, heating to 80-90 ℃, and stirring for 1-2h under heat preservation to obtain the modifier.
4. The noise-reducing rubber-modified asphalt concrete according to claim 1, wherein: the tackifier is one of terpene resin and rosin resin.
5. The noise-reducing rubber-modified asphalt concrete according to claim 1, wherein: the rubber modified asphalt is prepared by the following method: heating the matrix asphalt to 180-.
6. A method for preparing the noise-reducing rubber modified asphalt concrete according to any one of claims 1 to 5, wherein: the method comprises the following steps: heating 8-12 parts by weight of rubber modified asphalt to 180 ℃ of 160-.
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CN112625453B (en) * 2020-11-09 2023-06-20 蚌埠四方沥青有限责任公司 Modified decolorized asphalt and preparation method thereof
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