CN109678398B - High-adsorptivity recycled asphalt concrete and preparation process thereof - Google Patents
High-adsorptivity recycled asphalt concrete and preparation process thereof Download PDFInfo
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- CN109678398B CN109678398B CN201910082616.0A CN201910082616A CN109678398B CN 109678398 B CN109678398 B CN 109678398B CN 201910082616 A CN201910082616 A CN 201910082616A CN 109678398 B CN109678398 B CN 109678398B
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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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- 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
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- C04B2111/0075—Uses not provided for elsewhere in C04B2111/00 for road construction
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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
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Abstract
The invention discloses high-adsorptivity recycled asphalt concrete and a preparation process thereof, relates to the technical field of asphalt concrete processing, and solves the problem that cracks are easy to appear on the whole asphalt concrete pavement due to poor bonding property between new asphalt concrete and old asphalt concrete during laying. The high-adsorptivity recycled asphalt concrete comprises the following components in parts by weight: 75-85 parts of new aggregate; 5-8 parts of SBS modified asphalt; 0.3-0.5 part of mineral powder; 20-25 parts of a regenerated asphalt mixed old material; 0.1-0.2 part of a regenerant; 2.5-4.5 parts of a fiber filler; 4-10 parts of steel slag; 1.6-1.8 parts of carbon film crushed aggregates; 0.2-0.4 part of tackifier. When the high-adsorptivity recycled asphalt concrete is used for road paving, the high-adsorptivity recycled asphalt concrete has good binding property with old asphalt concrete on a road, so that the whole asphalt concrete road is not easy to generate cracks in the using process and has good stability.
Description
Technical Field
The invention relates to the technical field of asphalt concrete processing, in particular to high-adsorptivity recycled asphalt concrete and a preparation process thereof.
Background
The asphalt concrete is commonly called as asphalt concrete, and is a mixture prepared by manually selecting mineral aggregate with a certain gradation composition, broken stone or crushed gravel, stone chips or sand, mineral powder and the like, and mixing the mineral aggregate, the broken stone or crushed gravel, the stone chips or sand, the mineral powder and a certain proportion of road asphalt material under strictly controlled conditions.
The invention discloses a composite modified asphalt concrete in Chinese patent with application publication number CN104355569A, which is prepared from the following raw materials in parts by weight: 100 parts of mineral aggregate, 3-7 parts of asphalt, 0.05-0.15 part of chlorinated polyethylene, 0.2-1.5 parts of aliphatic polyurethane resin, 0.075-1 part of serpentine, 0.15-1.5 parts of halloysite and 0.001-0.04 part of coupling agent. The grading type of the mineral aggregate is AC-13 type, AM-13 type, SMA-13 type or OGFC-13 type. The coupling agent is JL-G02FX type amine-terminated polyol ester coupling agent.
In the above patent, the serpentine and halloysite are composed of numerous fine tubular or fibrous crystals, so that the composite modified asphalt concrete has good fire resistance and flame retardant properties, but in the process of laying the composite modified asphalt concrete, the newly prepared composite modified asphalt concrete and the old asphalt concrete pavement need to be spliced together, and the poor binding property between the two is likely to cause cracks between the composite modified asphalt concrete and the old asphalt concrete pavement in the using process, so a new scheme needs to be proposed to solve the above problems.
Disclosure of Invention
Aiming at the problem that the whole asphalt concrete pavement is easy to crack due to poor bonding between new asphalt concrete and old asphalt concrete during paving in the prior art, the invention aims to provide the high-adsorptivity regenerated asphalt concrete, which has good permeability and adsorptivity by adding carbon film crushed aggregates so as to solve the technical problem, and the high-adsorptivity regenerated asphalt concrete has good bonding with the old asphalt concrete on the road so that the whole asphalt concrete pavement is not easy to crack in the using process.
In order to achieve the first purpose, the invention provides the following technical scheme:
the high-adsorptivity recycled asphalt concrete comprises the following components in parts by weight:
75-85 parts of new aggregate;
5-8 parts of SBS modified asphalt;
0.3-0.5 part of mineral powder;
20-25 parts of a regenerated asphalt mixed old material;
0.1-0.2 part of a regenerant;
2.5-4.5 parts of a fiber filler;
4-10 parts of steel slag;
1.6-1.8 parts of carbon film crushed aggregates;
0.2-0.4 part of tackifier.
By adopting the technical scheme, the old regenerated asphalt mixture is obtained by digging, recycling, crushing and screening the old asphalt pavement, but the asphalt in the old regenerated asphalt mixture is aged in different degrees in the long-time use process, and the addition of the regenerant can improve the compatibility of the asphalt and improve the penetration and ductility of the whole asphalt. The steel slag is a byproduct in the steel-making process, has high strength, rough surface, good wear resistance and durability and good temperature change resistance, and greatly improves the overall quality of the high-adsorptivity recycled asphalt concrete. Meanwhile, the mixed old recycled asphalt material and the steel slag are mixed for use, so that the method is favorable for saving a large amount of raw materials such as asphalt, gravel and the like, is also favorable for treating waste materials and protecting the environment, and has remarkable economic benefit, social benefit and environmental benefit.
The carbon film is formed by high-temperature pyrolysis and carbonization of carbon-containing substances, and not only has higher high-temperature resistance, acid and alkali resistance and chemical solvent resistance and higher mechanical strength, but also has uniform pore size distribution and higher permeability and adsorption capacity. The crushed carbon film crushed aggregates are used in the high-adsorptivity recycled asphalt concrete, the carbon film crushed aggregates are partially embedded in the old asphalt concrete on the road, the asphalt in the high-adsorptivity recycled asphalt concrete is tightly attached to the old asphalt concrete on the road through the carbon film crushed aggregates, and then the high-adsorptivity recycled asphalt concrete and the old asphalt concrete on the road have good bonding strength and are not easy to crack in the using process.
The fiber filler has good filling property and wear resistance, high strength, no pollution and strong chemical corrosion resistance, and can greatly improve the overall quality of the high-adsorptivity recycled asphalt concrete. Meanwhile, the fiber filler and the carbon film crushed aggregates can play a good role in compounding and synergism when being mixed for use, partial fibers can be adsorbed on the surface of the carbon film crushed aggregates, and when the carbon film crushed aggregates are embedded in old asphalt concrete on a road, partial fiber filler in the high-adsorbability regenerated asphalt concrete and the old asphalt concrete on the road can be tightly fixed together, so that the bonding strength between the high-adsorbability regenerated asphalt concrete and the old asphalt concrete on the road is greatly improved. The tackifier wets the bonding surface through surface diffusion or internal diffusion, so that the bonding strength between the high-adsorptivity recycled asphalt concrete and the old asphalt concrete on the road is improved, and the whole road is not easy to crack.
More preferably, the size of the carbon film crushed material is (0.5-1.5 mm) × 1mm × 0.1 mm.
By adopting the technical scheme, when the size of the carbon film crushed aggregates is within the range of (0.5-1.5 mm) multiplied by 1mm multiplied by 0.1mm, the carbon film crushed aggregates have good dispersibility in the high-adsorptivity recycled asphalt concrete and have good compatibility with raw materials of all components, so that the high-adsorptivity recycled asphalt concrete keeps good quality. Meanwhile, in the preparation process of the high-adsorptivity recycled asphalt concrete, the carbon film crushed aggregates can be maintained in an unfolded state and are not easy to roll, and further the carbon film crushed aggregates can keep good permeability and adsorptivity.
More preferably, 2-4 parts by weight of polyborosiloxane is also added into the high-adsorptivity regenerated asphalt concrete.
By adopting the technical scheme, the polyborosiloxane can improve the binding property of the old asphalt and the SBS modified asphalt in the regenerated asphalt mixed old material, and can ensure that the whole asphalt in the high-adsorbability regenerated asphalt concrete has good bonding strength, thereby being beneficial to improving the binding strength between the old asphalt concrete and the high-adsorbability regenerated asphalt concrete on the road. Meanwhile, the polyborosiloxane has good high-temperature resistance and is a good stabilizer, so that the high-adsorptivity recycled asphalt concrete has good stability in the using process.
More preferably, 1.6-2.4 parts by weight of nano-filler is added into the high-adsorptivity recycled asphalt concrete, and the nano-filler mainly comprises nano-alumina, nano-titanium oxide and nano-silicon oxide in any weight part ratio.
By adopting the technical scheme, the nano filler mainly composed of nano aluminum oxide, nano titanium oxide and nano silicon oxide has good strength and stability, has good dispersity in the high-adsorbability recycled asphalt concrete, has good compatibility with raw materials of all components, and can greatly improve the overall quality of the high-adsorbability recycled asphalt concrete. Meanwhile, part of the nano filler can be adsorbed on the surface of the carbon film crushed aggregates and then embedded in the old asphalt concrete of the road, so that the bonding strength between the high-adsorbability regenerated asphalt concrete and the old asphalt concrete on the road is greatly improved, and cracks are not easy to generate in the using process.
More preferably, the new aggregate is prepared by mixing limestone with the particle size ranges of 0-3 mm, 3-5 mm, 5-13 mm, 13-20 mm and 20-25 mm according to the weight part ratio of (1.5-2.5): (2.5-3.5): (7.2-8.2): 1: (3.2-4.2).
By adopting the technical scheme, the limestone and SBS modified asphalt have good bonding performance, the interface strength of the limestone and SBS modified asphalt is not easily weakened due to severe change of external temperature, and the high-adsorptivity recycled asphalt concrete has good stability in the using process. Limestone with different particle sizes is selected to form a new aggregate, so that the new aggregate, the old regenerated asphalt mixture and the SBS modified asphalt form a colloid network with apparent density in the high-adsorbability regenerated asphalt concrete, and when the high-adsorbability regenerated asphalt concrete is laid, larger pores are not easy to generate between the high-adsorbability regenerated asphalt concrete and the old asphalt concrete on a road, and the high-adsorbability regenerated asphalt concrete has high bonding strength.
Preferably, the used recycled asphalt mixture mainly comprises the following raw materials in parts by weight of old asphalt concrete with the particle size ranges of 0-8 mm, 8-15 mm and 15-25 mm (0.6-0.8): 1: (1.4-1.6).
By adopting the technical scheme, the old recycled asphalt concrete with different particle sizes is selected and formed according to different proportions, so that the old recycled asphalt mixture, the new aggregate and the SBS modified asphalt have good bonding performance, and the internal pores of the high-adsorbability recycled asphalt concrete are reduced. Meanwhile, the regenerated asphalt mixed old materials with different particle sizes can form a stable dispersion system in the new aggregate, and when high-adsorbability regenerated asphalt concrete is paved on a road, the high-adsorbability regenerated asphalt concrete can be tightly attached to the old asphalt concrete on the road, so that the whole road is not easy to crack in the using process.
More preferably, the fibrous filler is one or more selected from lignin fiber, brucite fiber and sepiolite fiber.
By adopting the technical scheme, the lignin fiber, the brucite fiber and the sepiolite fiber are good fiber fillers, have good structural strength and chemical stability, and are beneficial to ensuring that the high-adsorbability regenerated asphalt concrete has good quality. Simultaneously, the adsorption efficiency of lignin fiber, brucite fiber and sepiolite fiber is better, and it can play good cooperation effect with the carbon film crushed aggregates, not only can form the network structure of mutual adhesion in the inside of high adsorptivity regeneration asphalt concrete, makes the structural strength of high adsorptivity regeneration asphalt concrete improve greatly, can also improve the bonding strength between old asphalt concrete and high adsorptivity regeneration asphalt concrete on the road.
More preferably, the tackifier is one or more selected from styrene butadiene rubber, organic silicon resin, phenolic resin and rosin glyceride.
By adopting the technical scheme, the styrene butadiene rubber, the organic silicon resin, the phenolic resin and the rosin glyceride are good tackifiers, can perform good fusion and modification effects on the old asphalt and the SBS modified asphalt on the regenerated asphalt mixed old material, improve the bonding strength between the high-adsorbability regenerated asphalt concrete and the old asphalt concrete on the road, and enable the whole road to be difficult to crack.
The invention also aims to provide a preparation process of the high-adsorptivity recycled asphalt concrete, the high-adsorptivity recycled asphalt concrete prepared by the preparation process has good bonding property with the old asphalt concrete on the road, and the whole asphalt concrete road is not easy to generate cracks in the using process.
In order to achieve the second purpose, the invention provides the following technical scheme, which comprises the following steps:
step one, stirring and drying new aggregate, fiber filler and steel slag in corresponding weight parts in a drying barrel, controlling the temperature at 80-110 ℃, the time at 30-50 min and the stirring speed at 800-1200 rpm to obtain a dry mixture;
step two, putting the dried mixture into a mixing cylinder, heating 60-70 wt% of SBS modified asphalt to 150-160 ℃, uniformly adding into the mixing cylinder within 20-30 s, and stirring at the speed of 800-1000 rpm;
preheating the used regenerated asphalt mixture and adding the preheated regenerated asphalt mixture and a regenerant into the mixing cylinder, keeping the temperature in the mixing cylinder at 160-180 ℃, stirring at the speed of 600-900 rpm for 25-30 min, adding the rest parts by weight of SBS modified asphalt and carbon film crushed aggregates, and stirring and mixing at the speed of 600-800 rpm for 10-15 min;
and step four, adding mineral powder and a tackifier into the mixing cylinder, and uniformly mixing to obtain the high-adsorbability recycled asphalt concrete, wherein the discharging temperature is 160-170 ℃.
By adopting the technical scheme, the novel aggregate, the fiber filler and the steel slag are dried and mixed, so that the novel aggregate, the fiber filler and the steel slag are prevented from being adhered together due to moisture, and the high-adsorbability recycled asphalt concrete has good quality. And firstly, mixing part of SBS modified asphalt with new aggregate, then adding the regenerated asphalt mixture old material which is preheated and mixed with the regenerant, and finally adding the rest SBS modified asphalt, and adding the carbon membrane crushed aggregates at the moment, so that the surface of the new aggregate can be wrapped with more SBS modified asphalt, the carbon membrane crushed aggregates can be uniformly distributed in the high-adsorbability regenerated asphalt concrete, and the high-adsorbability regenerated asphalt concrete has a good using effect.
In summary, compared with the prior art, the invention has the following beneficial effects:
(1) the carbon film crushed aggregates have uniform pore size distribution and higher permeability and adsorption capacity, and can play a good role in compounding and synergism when being mixed with the fiber filler for use, so that the high-adsorbability recycled asphalt concrete has good bonding strength with the old asphalt concrete on a road, and cracks are not easy to generate in the use process;
(2) the polyborosiloxane is added, so that the binding property of the old asphalt in the old regenerated asphalt mixture and the SBS modified asphalt can be improved, the whole asphalt in the high-adsorptivity regenerated asphalt concrete has good bonding strength, and the binding strength between the old asphalt concrete on the road and the high-adsorptivity regenerated asphalt concrete is greatly improved;
(3) the nanometer filler mainly composed of nanometer alumina, nanometer titanium oxide and nanometer silicon oxide is added, so that part of the nanometer filler can be adsorbed on the surface of the carbon film crushed aggregates and then embedded in the old asphalt concrete of the road, which is beneficial to reducing the pores between the high-adsorbability regenerated asphalt concrete and the old asphalt concrete on the road, and further the asphalt concrete road surface is not easy to generate cracks.
Drawings
FIG. 1 is a flow chart of the preparation process of the high-adsorptivity recycled asphalt concrete.
Detailed Description
The invention is described in detail below with reference to the figures and examples.
Example 1: the high-adsorptivity recycled asphalt concrete comprises the components and corresponding parts by weight shown in Table 1 and is prepared by the following steps:
step one, stirring and drying new aggregates, lignin fibers and steel slag in corresponding weight parts in a drying barrel, controlling the temperature at 100 ℃, the time at 30min and the stirring speed at 900rpm to obtain a dried mixture;
step two, putting the dried mixture into a mixing cylinder, heating 60 weight percent of SBS modified asphalt to 160 ℃, uniformly adding the SBS modified asphalt into the mixing cylinder within 30s, and stirring at the stirring speed of 1000 rpm;
step three, preheating the old regenerated asphalt mixture to 80 ℃, adding the preheated old regenerated asphalt mixture and a regenerant into the mixing cylinder, keeping the temperature in the mixing cylinder at 175 ℃, stirring at the stirring speed of 800rpm for 25min, adding the rest parts by weight of SBS modified asphalt and carbon film crushed aggregates, and stirring and mixing at the stirring speed of 700rpm for 10 min;
and step four, adding the mineral powder and the styrene butadiene rubber into the mixing cylinder, and uniformly mixing to obtain the high-adsorbability recycled asphalt concrete, wherein the discharging temperature is 170 ℃.
Note: in the steps, the new aggregate is mainly prepared from limestone with the particle size range of 0-3 mm, 3-5 mm, 5-13 mm, 13-20 mm and 20-25 mm in a weight ratio of 2:3: 7.7: 1: 3.7, and the limestone powder is obtained by screening limestone raw materials through screens of 3mm, 5mm, 13mm, 20mm and 25mm in sequence. The recycled asphalt mixed old material mainly comprises 0.7 parts by weight of old asphalt concrete with the particle size range of 0-8 mm, 8-15 mm and 15-25 mm: 1: 1.5, and the waste asphalt concrete is obtained by sieving an old asphalt concrete raw material by using 8mm, 15mm and 25mm screens in sequence. The size of the crushed carbon film is 1mm multiplied by 0.1 mm. The regenerant is selected from an asphalt regenerant with the model of WSG-S29 in Shanghai Wanzhan Fine chemical Co., Ltd.
Examples 2 to 8: the high-adsorptivity recycled asphalt concrete is different from the recycled asphalt concrete 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 1-8
Example 9: the high-adsorptivity recycled asphalt concrete is different from that in the embodiment 1 in that the new aggregate mainly comprises limestone with the particle size ranges of 0-3 mm, 3-5 mm, 5-13 mm, 13-20 mm and 20-25 mm in the weight portion ratio of 1.5: 2.5: 7.2: 1: 3.2.
Example 10: the high-adsorptivity recycled asphalt concrete is different from that in the embodiment 1 in that the new aggregate mainly comprises limestone with the particle size ranges of 0-3 mm, 3-5 mm, 5-13 mm, 13-20 mm and 20-25 mm in the weight portion ratio of 2.5: 3.5: 8.2: 1: 4.2.
Example 11: the high-adsorptivity recycled asphalt concrete is different from that in the embodiment 1 in that the recycled asphalt mixed old material mainly comprises 0.6 parts by weight of old asphalt concrete with the particle size of 0-8 mm, 8-15 mm and 15-25 mm: 1: 1.4.
Example 12: the high-adsorptivity recycled asphalt concrete is different from that in the embodiment 1 in that the recycled asphalt mixed old material mainly comprises 0.8 parts by weight of old asphalt concrete with the particle size of 0-8 mm, 8-15 mm and 15-25 mm: 1: 1.6.
Example 13: a high-adsorptivity recycled asphalt concrete, which is different from that of example 1 in that the size of the crushed carbon films is 0.5mm by 1mm by 0.1 mm.
Example 14: a high-adsorptivity recycled asphalt concrete, which is different from that of example 1 in that the size of the crushed carbon films is 1.5mm by 1mm by 0.1 mm.
Example 15: the difference between the high-adsorptivity recycled asphalt concrete and the embodiment 1 is that the first step specifically comprises the following steps of stirring and drying 75 parts by weight of new aggregate, 4.5 parts by weight of brucite fibers and 4 parts by weight of steel slag in a drying barrel, controlling the temperature at 100 ℃, the time at 30min and the stirring speed at 900rpm to obtain a dry mixture.
Example 16: the difference between the high-adsorptivity recycled asphalt concrete and the embodiment 1 is that the first step specifically comprises the following steps of stirring and drying 75 parts by weight of new aggregate, 2.5 parts by weight of brucite fibers, 2 parts by weight of sepiolite fibers and 4 parts by weight of steel slag in a drying barrel, controlling the temperature at 100 ℃, the time at 30min and the stirring speed at 900rpm to obtain a dry mixture.
Example 17: the difference between the high-adsorbability recycled asphalt concrete and the embodiment 1 is that the fourth step specifically comprises the following steps of adding 0.3 part by weight of mineral powder and 0.2 part by weight of organic silicon resin into a mixing cylinder, and uniformly mixing to obtain the high-adsorbability recycled asphalt concrete, wherein the discharging temperature is 170 ℃.
Example 18: the difference between the high-adsorbability recycled asphalt concrete and the embodiment 1 is that the fourth step specifically comprises the following steps of adding 0.3 part by weight of mineral powder, 0.1 part by weight of phenolic resin and 0.1 part by weight of rosin glyceride into a mixing cylinder, and uniformly mixing to obtain the high-adsorbability recycled asphalt concrete, wherein the discharging temperature is 170 ℃.
Example 19: a high-adsorptivity recycled asphalt concrete is different from that in example 1 in that the third step specifically comprises the following steps of preheating a recycled asphalt mixed old material to 80 ℃, adding the preheated recycled asphalt mixed old material and 0.1 part of a regenerant into a mixing cylinder, keeping the temperature in the mixing cylinder at 175 ℃, stirring at the stirring speed of 800rpm for 25min, adding the remaining 40% by weight of SBS modified asphalt, 1.8 parts of carbon film crushed aggregates and 3 parts of polyborosiloxane, stirring and mixing at the stirring speed of 700rpm for 10 min.
Example 20: a high-adsorptivity recycled asphalt concrete, which is different from that of example 19, comprises the following specific steps of preheating a recycled asphalt mixed old material to 80 ℃ and adding the preheated recycled asphalt mixed old material and 0.1 part of a regenerant into the mixing cylinder, keeping the temperature in the mixing cylinder at 175 ℃, stirring at 800rpm for 25min, adding the remaining 40% by weight of SBS modified asphalt, 1.8 parts of carbon film crushed material and 2 parts of polyborosiloxane, stirring and mixing at 700rpm for 10 min.
Example 21: a high-adsorptivity recycled asphalt concrete, which is different from that of example 19, comprises the following specific steps of preheating a recycled asphalt mixed old material to 80 ℃ and adding the preheated recycled asphalt mixed old material and 0.1 part of a regenerant into the mixing cylinder, keeping the temperature in the mixing cylinder at 175 ℃, stirring at 800rpm for 25min, adding the remaining 40% by weight of SBS modified asphalt, 1.8 parts of carbon film crushed material and 4 parts of polyborosiloxane, stirring and mixing at 700rpm for 10 min.
Example 22: the difference between the high-adsorptivity recycled asphalt concrete and the embodiment 21 is that the fourth step specifically comprises the following steps of adding 0.3 part by weight of mineral powder, 0.2 part by weight of styrene butadiene rubber and 2 parts by weight of nano filler into a mixing cylinder, wherein the nano filler is composed of nano alumina, nano titanium oxide and nano silicon oxide in a weight ratio of 1:1:1, and the high-adsorptivity recycled asphalt concrete can be obtained after uniformly mixing the nano filler and the nano silicon oxide, and the discharging temperature is 170 ℃.
Example 23: the difference between the high-adsorptivity recycled asphalt concrete and the embodiment 22 is that the fourth step specifically comprises the following steps of adding 0.3 part by weight of mineral powder, 0.2 part by weight of styrene butadiene rubber and 1.6 parts by weight of nano filler into a mixing cylinder, wherein the nano filler is composed of nano alumina, nano titanium oxide and nano silicon oxide in a weight ratio of 2:3:4, and the high-adsorptivity recycled asphalt concrete can be obtained after uniformly mixing the nano filler, the nano titanium oxide and the nano silicon oxide, and the discharging temperature is 170 ℃.
Example 24: the difference between the high-adsorptivity recycled asphalt concrete and the embodiment 22 is that the fourth step specifically comprises the following steps of adding 0.3 part by weight of mineral powder, 0.2 part by weight of styrene butadiene rubber and 2.4 parts by weight of nano filler into a mixing cylinder, wherein the nano filler is composed of nano alumina, nano titanium oxide and nano silicon oxide in a weight ratio of 0.8:1:1.3, and the high-adsorptivity recycled asphalt concrete can be obtained after uniformly mixing the nano filler and the nano titanium oxide, and the discharging temperature is 170 ℃.
Comparative example 1: the difference between the step three and the embodiment 1 is that the step three specifically comprises the following steps of preheating the recycled asphalt mixed old material to 80 ℃, adding the preheated recycled asphalt mixed old material and 0.1 part of regenerant into the mixing cylinder, keeping the temperature in the mixing cylinder at 175 ℃, stirring at the stirring speed of 800rpm for 25min, adding the rest 40% by weight of SBS modified asphalt, stirring and mixing at the stirring speed of 700rpm for 10 min.
Comparative example 2: the difference between the high-adsorptivity recycled asphalt concrete and the embodiment 1 is that the first step specifically comprises the following steps of stirring and drying 75 parts by weight of new aggregate and 4 parts by weight of steel slag in a drying barrel, controlling the temperature at 100 ℃, the time at 30min and the stirring speed at 900rpm to obtain a dry mixture.
Comparative example 3: a high-adsorptivity recycled asphalt concrete is different from that of a comparative example 1 in that the first step specifically comprises the following steps of stirring and drying 75 parts by weight of new aggregate and 4 parts by weight of steel slag in a drying barrel, controlling the temperature at 100 ℃, the time at 30min and the stirring speed at 900rpm to obtain a dry mixture.
Performance testing
Test samples: the high-adsorptivity recycled asphalt concretes obtained in examples 1 to 24 were used as test samples 1 to 24, and the high-adsorptivity recycled asphalt concretes obtained in comparative examples 1 to 3 were used as control samples 1 to 3.
The test method comprises the following steps: selecting the composite modified asphalt concrete of the first embodiment of the invention of China, the application publication number of which is CN104355569A, manufacturing a standard sample according to the provisions of test regulations of road engineering asphalt and asphalt mixtures (JTJ052-2000), aging the standard sample of the composite modified asphalt concrete in a constant-temperature aging test box for 1h at the temperature of 60 ℃, then respectively adhering the test samples 1-24 and the control samples 1-3 with the standard sample of the composite modified asphalt concrete and the high-adsorptivity recycled asphalt concrete according to the technical Specification for road asphalt pavement construction (JTGF40-2004), and curing and forming to obtain the test block. And measuring the connection strength between the composite modified asphalt concrete and the high-adsorbability recycled asphalt concrete in the test blocks corresponding to the test samples 1-24 and the control samples 1-3 by using an electronic universal tester.
And (3) test results: the test results of the test samples 1 to 24 and the control samples 1 to 3 are shown in Table 2. As can be seen from table 2, from comparison of the test results of the test samples 1 to 8 and the control samples 1 to 3, the carbon film crushed aggregates can provide good bonding strength between the high-adsorptivity recycled asphalt concrete and the old asphalt concrete on the road, and the bonding strength between the high-adsorptivity recycled asphalt concrete and the old asphalt concrete on the road can be further improved by adding the fiber filler mixture. From the comparison of the test results of the test samples 1-8 and the test samples 9-18, the sizes of the new aggregate, the recycled asphalt mixed old material and the carbon film crushed material, the fiber filler and the tackifier disclosed by the invention are all suitable for preparing the high-adsorptivity recycled asphalt concrete, and the composite modified asphalt concrete after aging treatment and the high-adsorptivity recycled asphalt concrete have good connection strength. The test results of the test samples 1 to 8 and the test samples 19 to 21 are compared, and the polyborosiloxane is added, so that the connection strength between the aged composite modified asphalt concrete and the high-adsorbability recycled asphalt concrete is greatly improved. The comparison of the test results of the test samples 1-8 and the test samples 22-24 can obtain that the quality of the high-adsorptivity recycled asphalt concrete can be further improved by adding the nano filler mainly composed of nano aluminum oxide, nano titanium oxide and nano silicon oxide.
TABLE 2 test results of test samples 1-24 and control samples 1-3
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 (6)
1. The high-adsorptivity recycled asphalt concrete is characterized by comprising the following components in parts by weight:
75-85 parts of new aggregate;
5-8 parts of SBS modified asphalt;
0.3-0.5 part of mineral powder;
20-25 parts of a regenerated asphalt mixed old material;
0.1-0.2 part of a regenerant;
2.5-4.5 parts of a fiber filler;
4-10 parts of steel slag;
1.6-1.8 parts of carbon film crushed aggregates;
0.2-0.4 part of tackifier;
the new aggregate is prepared from limestone with the particle size ranges of 0-3 mm, 3-5 mm, 5-13 mm, 13-20 mm and 20-25 mm according to the weight part ratio of (1.5-2.5): (2.5-3.5): (7.2-8.2): 1: (3.2-4.2); the recycled asphalt mixed old material is prepared from 0-8 mm, 8-15 mm and 15-25 mm of old asphalt concrete in parts by weight (0.6-0.8): 1: (1.4-1.6); the size of the carbon film crushed aggregates is (0.5-1.5 mm) multiplied by 1mm multiplied by 0.1 mm.
2. The high-adsorptivity recycled asphalt concrete according to claim 1, wherein 2-4 parts by weight of polyborosiloxane is further added into the high-adsorptivity recycled asphalt concrete.
3. The high-adsorptivity recycled asphalt concrete according to claim 1, wherein 1.6-2.4 parts by weight of nano-filler is further added into the high-adsorptivity recycled asphalt concrete, and the nano-filler is composed of nano-alumina, nano-titania and nano-silica in any weight ratio.
4. The high-adsorptivity recycled asphalt concrete according to claim 1, wherein said fibrous filler is selected from one or more of lignin fibers, brucite fibers and sepiolite fibers.
5. The high-adsorptivity recycled asphalt concrete according to claim 1, wherein the tackifier is selected from one or more of styrene-butadiene rubber, silicone resin, phenolic resin and rosin glyceride.
6. The process for preparing the high-adsorptivity recycled asphalt concrete according to claim 1, comprising the following steps:
step one, stirring and drying new aggregate, fiber filler and steel slag in corresponding weight parts in a drying barrel, controlling the temperature at 80-110 ℃, the time at 30-50 min and the stirring speed at 800-1200 rpm to obtain a dry mixture;
step two, putting the dried mixture into a mixing cylinder, heating 60-70 wt% of SBS modified asphalt to 150-160 ℃, uniformly adding into the mixing cylinder within 20-30 s, and stirring at the speed of 800-1000 rpm;
preheating the used regenerated asphalt mixture and adding the preheated regenerated asphalt mixture and a regenerant into a mixing cylinder, keeping the temperature in the mixing cylinder at 160-180 ℃, stirring at the speed of 600-900 rpm for 25-30 min, adding the rest parts by weight of SBS modified asphalt and carbon film crushed aggregates, and stirring and mixing at the speed of 600-800 rpm for 10-15 min;
and step four, adding mineral powder and a tackifier into the mixing cylinder, and uniformly mixing to obtain the high-adsorbability recycled asphalt concrete, wherein the discharging temperature is 160-170 ℃.
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| CN112300585B (en) * | 2020-11-05 | 2022-07-01 | 广东宏骏建筑工程有限公司 | Asphalt pavement regeneration method |
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