CN109721286B - Heat-resistant recycled asphalt concrete and preparation method thereof - Google Patents
Heat-resistant recycled asphalt concrete and preparation method thereof Download PDFInfo
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Abstract
The invention discloses heat-resistant recycled asphalt concrete and a preparation method thereof. The heat-resistant recycled asphalt concrete comprises the following components: new asphalt, RAP material, regenerant, steel slag, ceramic micro powder, mineral powder, new aggregate, silicon dioxide and glass fiber; the regenerant comprises the following components: base oil, a dispersing agent, an alkylated diphenylamine antioxidant, dichloromethane, an ultraviolet absorbent, dicumyl peroxide, a surfactant, an SBS modifier, absolute ethyl alcohol, styrene-butadiene rubber powder and hollow glass beads; the preparation method comprises the following steps: s1, collecting RAP materials; s2, preparing a first mixture; s3, preparing a second mixture; s4, preparing a third mixture; s5, preparing a finished product. The heat-resistant recycled asphalt concrete has excellent crack resistance, durability, high temperature resistance and track deformation resistance; in addition, the preparation method of the invention has the advantage of uniform distribution of the asphalt.
Description
Technical Field
The invention relates to the technical field of highway engineering, in particular to heat-resistant recycled asphalt concrete and a preparation method thereof.
Background
With the development of national economy and highway traffic industry, the specific gravity of large freight vehicles in transport vehicles is continuously increased, the traffic volume is increased year by year, and the phenomena of vehicle overload and overrun commonly exist, under the repeated action of vehicle load, particularly heavy vehicle load, a pavement structure generates shear failure at the edge of a wheel, an asphalt surface layer generates unrecoverable residual deformation and rapidly accumulates, or cracks and gradually expands, so that the structural layer generates diseases such as rutting, fatigue and the like, the road is seriously affected, the early damage of the pavement is caused, the service life is greatly shortened, the service performance of the pavement is quickly attenuated, and higher requirements are provided for materials of the pavement. Meanwhile, people pay more and more attention to the saving and utilization of resources in recent years, the development and utilization of milling waste materials are more extensive and deeper along with the development of regeneration technology, and technicians continuously discuss how to enable the regenerated asphalt mixture to have better performance under the conditions of lower production cost and convenient implementation.
In the prior art, a chinese patent application with application number 201610170219.5 discloses a fiber composite recycled asphalt concrete, which is prepared from the following components in parts by weight: 0-5mm recycled asphalt concrete RAP30 parts, 5-10mm recycled asphalt concrete RAP25 parts, 10-30mm recycled asphalt concrete RAP28 parts, 10-30mm new aggregate 15 parts, mineral powder 2 parts, cement 1.5 parts, emulsified asphalt 4 parts, regenerant 1 part, and glass fiber 1.2 parts.
The existing fiber composite recycled asphalt concrete adopts coarse-grained asphalt concrete, the particle size of aggregate is increased, and glass fiber is added to improve the tensile property and the crack resistance of the mixture, but because the temperature stability of the asphalt pavement is poor, the temperature is high in summer days and the sunshine is sufficient, the asphalt pavement is easy to absorb heat and melt, the strength is reduced, and the unevenness of the asphalt pavement can be caused after a vehicle is rolled over, so that the service life of the asphalt pavement is influenced.
The technical problem to be solved by those skilled in the art is to provide a recycled asphalt concrete with high rutting resistance and durability at high temperature without reducing the cracking resistance of the asphalt concrete.
Disclosure of Invention
Aiming at the defects in the prior art, the first purpose of the invention is to provide the heat-resistant recycled asphalt concrete which has the advantages of good crack resistance, durability, high temperature resistance and rutting deformation resistance.
The second purpose of the invention is to provide a preparation method of heat-resistant recycled asphalt concrete, which has the advantage of uniformly blending aged asphalt and a recycling agent.
In order to achieve the first object, the invention provides the following technical scheme: the heat-resistant recycled asphalt concrete is characterized by comprising the following components in parts by weight: 60-90 parts of new asphalt, 50-70 parts of RAP material, 2-6 parts of regenerant, 10-20 parts of steel slag, 10-20 parts of ceramic micro powder, 4-9 parts of mineral powder, 10-20 parts of new aggregate, 1-5 parts of silicon dioxide and 3-8 parts of glass fiber; the regenerant comprises the following components in parts by weight: 80-100 parts of base oil, 10-20 parts of dispersing agent, 1-5 parts of alkylated diphenylamine antioxidant, 0.5-2 parts of dichloromethane, 10-30 parts of ultraviolet absorbent, 0.1-0.5 part of dicumyl peroxide, 10-15 parts of surfactant, 0.5-1.5 parts of SBS modifier, 10-20 parts of absolute ethyl alcohol, 10-20 parts of styrene butadiene rubber powder and 5-10 parts of hollow glass beads.
By adopting the technical scheme, the waste of the steel slag is used, the using amount of new aggregate is reduced, the mountain-opening stone-blasting can be effectively reduced, the ecological environment is protected to a certain extent, the main components of the steel slag are oxides of calcium, iron, magnesium, aluminum and the like, and the steel slag contains active mineral substances such as tricalcium silicate, dicalcium silicate, iron aluminate and the like similar to cement, and has the advantages of water-hardness gelatinization, high density, high strength, rough surface, good stability, good wear resistance and durability, firm combination with asphalt, and capability of improving the strength of the heat-resistant recycled asphalt concrete, so that the rutting deformation resistance of the heat-resistant recycled asphalt concrete is improved.
The main components of the ceramic micro powder are silicon dioxide and aluminum oxide, the ceramic micro powder is a microsphere with high strength and hardness, the dispersibility is good, the heat-resistant temperature is high, the addition of the ceramic micro powder can improve the compactness, the durability, the high temperature resistance and the mechanical capacity of the heat-resistant recycled asphalt concrete, the glass fiber is an inorganic non-metallic material with strong heat resistance and high mechanical strength, the glass fiber is blended in the recycled asphalt concrete and can enhance the tensile strength of the heat-resistant recycled asphalt concrete and prevent the heat-resistant recycled asphalt concrete from cracking, the silicon dioxide has chemical inertness, can improve the corrosion resistance of the asphalt pavement and has high temperature resistance, and the silicon dioxide is dispersed in the asphalt concrete and is matched with steel slag to further enhance the high temperature resistance of the asphalt pavement.
Because the thermal conductivity of the steel slag is higher than that of common aggregate, the requirement on the regenerant is higher, the water absorption of the steel slag is high, the regenerant is easily adsorbed by the steel slag and cannot be fused with RAP materials when the recycled asphalt concrete is manufactured, the regenerant needs to be improved, in the invention, dichloromethane is used as a softener, when the regenerant is contacted with aged asphalt, the regenerant is softened, aged asphalt is fully contacted with the regenerant and is uniformly fused, an anti-ultraviolet auxiliary agent can improve the anti-ultraviolet performance of the heat-resistant recycled asphalt concrete and improve the durability and the aging resistance, absolute ethyl alcohol is used as a fusing agent, the regenerant can be rapidly fused with the aged asphalt, styrene-butadiene rubber powder, new asphalt and the aged asphalt are mutually crosslinked to form a three-dimensional network structure, so that the wear resistance, the heat resistance and the aging resistance of an asphalt pavement are greatly improved, the hollow glass microspheres have the advantages of light weight, low heat conduction, high melting point, higher strength, good chemical stability and the like, the surfaces of the hollow glass microspheres are subjected to special treatment to have oleophilic and hydrophobic properties, and the hollow glass microspheres can be rapidly dispersed in base oil when being mixed with the base oil.
Further, the preparation method of the regenerant comprises the following steps: (1) adding base oil, surfactant and dispersant into a reactor, heating to 150-;
(2) stirring styrene-butadiene rubber powder and hollow glass beads for 30-40min at the rotating speed of 800r/min of 500-.
By adopting the technical scheme, the base oil, the surfactant and the dispersant are firstly mixed, and then the styrene butadiene rubber powder and the hollow glass beads are stirred and mixed, so that all raw materials and high polymer materials can be uniformly mixed, the physical aggregation can be rapidly generated, the RAP utilization rate can be improved, the adhesion of the RAP and new aggregates, new asphalt and steel slag can be improved, and the high-temperature stability, the crack resistance and the fatigue resistance of the heat-resistant recycled asphalt concrete can be improved.
Further, the base oil is a mixture consisting of tung oil, turpentine and rubber oil in a mass ratio of (2-4) to (1-1.5) to (3-5), and the rubber oil is naphthenic rubber oil.
By adopting the technical scheme, the tung oil contains a large amount of mineral oil, which can provide light oil components lost in the long-term aging process of asphalt, and contains a large amount of unsaturated fatty acid with higher boiling point, which has higher high temperature resistance in the regeneration process of the aged asphalt, the tung oil can not only reduce the viscosity of RAP material, but also be beneficial to improving the low-temperature performance of the asphalt, the turpentine has good solubility to the asphalt, and can improve the permeability of the regenerant, accelerate the fusion speed when the regenerant is mixed with the aged asphalt, improve the recovery rate of the aged asphalt, the rubber oil belongs to an environment-friendly product, which can ensure the balance of components in the regenerated asphalt, and can improve the high temperature resistance of the aged asphalt, the tung oil and the turpentine are matched with each other, can accelerate the fusion speed of the regenerant and the aged asphalt, and improve the high temperature resistance of the asphalt, the tung oil and the naphthenic rubber oil are matched with each other, so that the components in the regenerated asphalt can be balanced, the high-temperature stability of the regenerated asphalt is improved, the turpentine and the naphthenic rubber oil are used cooperatively, the fusion speed of the regenerant and the aged asphalt can be accelerated, the components in the regenerated asphalt are balanced, and the high-temperature resistance of the regenerated asphalt is improved.
Further, the dispersing agent is formed by mixing (0.5-1) to (15-20) by mass of stearamide and higher alcohol, wherein the higher alcohol is one of n-butyl alcohol, isobutyl alcohol, isoamyl alcohol and n-propyl alcohol.
By adopting the technical scheme, the stearamide and the higher alcohol are mixed for use, so that the dispersing effect can be improved, the lubricating property and the thermal stability of the regenerant are improved, and the mixing effect and the heat resistance of the heat-resistant recycled asphalt concrete are further improved.
Further, the surfactant is one or a mixture of two of hexadecyl trimethyl ammonium chloride and octadecyl trimethyl ammonium chloride.
By adopting the technical scheme, the hexadecyl trimethyl ammonium chloride and the octadecyl trimethyl ammonium chloride can improve the fusion degree of the new asphalt and the old asphalt, so that the new asphalt and the old asphalt form a relatively stable and new asphalt interface, and the cohesiveness, the strength and the high-temperature stability of the heat-resistant recycled asphalt concrete are improved.
Further, the RAP material comprises 30% of RAP material with the particle size of 1-8mm, 40% of RAP material with the particle size of 8-15mm and 30% of RAP material with the particle size of 15-25 mm.
By adopting the technical scheme, the RAP material with smaller particles has more content of fine materials and low utilization rate during regeneration, so that the RAP materials with the particle sizes of 1-8mm, 8-15mm and 15-25mm are selected for compounding, and the utilization rate of the RAP materials can be improved.
Furthermore, the oilstone ratio of 1-8mmRAP material is 3-4%, the oilstone ratio of 8-15mmRAP material is 3.5-4.1%, and the oilstone ratio of 15-25mmRAP material is 2.8-3.2%.
By adopting the technical scheme, the oilstone ratio of the RAP material is reasonably controlled, and the high temperature resistance and the rutting deformation resistance of the recycled asphalt concrete can be improved.
Further, the new asphalt is one of asphalt No. 70 asphalt and SBS modified asphalt.
By adopting the technical scheme, the penetration degree of the No. 70 asphalt and the SBS modified asphalt is large, the softening temperature is high, the 15 ℃ ductility of the No. 70 asphalt and the 5 ℃ ductility of the SBS modified asphalt are large, the high temperature resistance, the crack resistance and the durability of the recycled asphalt concrete can be improved, the SBS asphalt is a styrene-butadiene-styrene triblock copolymer, a polystyrene chain segment and a polybutadiene chain segment in the SBS modified asphalt obviously present a two-phase structure, and the two-phase separation structure enables the SBS asphalt to form a space three-dimensional network structure with an asphalt matrix, so that the temperature performance, the tensile property, the elasticity, the cohesion property, the stability and the aging resistance of a mixed material and the like of the asphalt are effectively improved, wherein the SBS modified asphalt has high temperature resistance and low temperature resistance, the temperature stability of an asphalt concrete pavement can be effectively improved, and the SBS modified asphalt has good anti-rutting capability, the elastic and tough road surface has high fatigue resistance and less permanent deformation.
Further, the new aggregate comprises 10-15 parts of 1-3mm limestone, 20-30 parts of 3-5mm limestone, 5-10 parts of 5-10mm basalt and 5-10 parts of 10-16mm basalt.
By adopting the technical scheme, when the new aggregate obtained by different particle size grading is used for preparing the heat-resistant recycled asphalt concrete, limestone with smaller particle size can be filled between the pores of basalt with larger particle size, so that the surface of the heat-resistant recycled asphalt concrete is compact when the heat-resistant recycled asphalt concrete is laid, and the rutting deformation resistance and the crack resistance of the heat-resistant recycled asphalt concrete are improved.
In order to achieve the second object, the invention provides the following technical scheme: the preparation method of the heat-resistant recycled asphalt concrete is characterized by comprising the following steps:
s1, collecting RAP materials: milling damaged old asphalt aggregate, and performing grading screening to form RAP material;
s2: preparing a first mixture: drying the new aggregate at the temperature of 140-160 ℃ for 5-10min, and uniformly stirring the new aggregate and 60% of new asphalt to prepare a first mixture;
s3, preparing a second mixture: preheating the regenerant at the temperature of 110-;
s4, preparing a third mixture: adding the residual 40% of the fresh asphalt into the second mixture, and uniformly mixing to obtain a third mixture;
s5, preparing a finished product: and (3) preheating the mineral powder at the temperature of 140-.
By adopting the technical scheme, as the old asphalt in the RAP material is aged, the consistency is very large, the fluidity is very poor, the old asphalt can not be uniformly distributed on the surfaces of all new aggregates in the process of mixing with the new aggregates, the new asphalt is added in two times, the new asphalt and the new aggregates are firstly mixed in the mixing process, the phenomenon that a large amount of new asphalt is wrapped on the RAP material and the new asphalt is less on the new aggregates due to different adsorption capacities of the new aggregates and the RAP material to the new asphalt is avoided, the difference of the adsorption capacities of the new aggregates and the RAP material to the new asphalt is fully considered, more new asphalt can be wrapped on the surfaces of the new aggregates, the asphalt distribution in the regenerated asphalt concrete is more uniform, the RAP material is dried, and if the heating temperature of the RAP material is too low, in order to meet the discharge temperature of a mixed material, the heating temperature of the new aggregates needs to be excessively increased, the quality of the new aggregate is reduced, and when the heating temperature is too high, asphalt in the RAP material is melted, so that the RAP material is bonded into a cluster to block equipment, and the aged asphalt in the RAP material is further aged to influence the quality of the recycled asphalt concrete.
In conclusion, the invention has the following beneficial effects:
firstly, because the steel slag and the ceramic micro powder are used as raw materials for preparing the heat-resistant recycled asphalt concrete, the use amount of new aggregate can be reduced, the ecological environment is protected, resources are saved, and the resources are recycled.
Secondly, the hollow glass beads, absolute ethyl alcohol and dichloromethane are used for preparing the regenerant, the hollow glass beads are small in heat conductivity coefficient, high in melting point and high in strength, the specially treated surfaces of the hollow glass beads have oleophylic hydrophobicity, the hollow glass beads can be fully dispersed in base oil, the heat-resistant temperature of the regenerant is improved, the paved asphalt pavement has the advantages of good heat insulation and preservation performance, high strength and good heat resistance, the dichloromethane can soften new asphalt and aged asphalt, the regenerant is prevented from being completely adsorbed by steel slag due to high water absorption of the steel slag when the new asphalt, the aged asphalt, new aggregate, the steel slag and ceramic micro powder are mixed, the mixture is uniformly fused, and the new asphalt and the aged asphalt can be rapidly fused through the absolute ethyl alcohol to form a stable new asphalt interface.
Thirdly, the invention adopts tung oil, turpentine and naphthenic rubber oil as base oil, wherein the tung oil can provide light oil component for the aged asphalt, unsaturated fatty acid with higher boiling point can improve the heat resistance of the heat-resistant recycled asphalt concrete, and simultaneously reduce the viscosity of RAP material, so that the RAP material is fully fused with new asphalt and regenerant, the turpentine can accelerate the fusion speed of the regenerant and the aged asphalt, and the naphthenic rubber oil can balance the components in the recycled asphalt, and the three components are mutually matched, so that the fusion speed of the regenerant and the aged asphalt and the heat resistance of the recycled asphalt can be further improved.
Fourthly, the method of the invention can make the new asphalt wrap the new aggregate and the RAP material more evenly by mixing the new asphalt with the new aggregate and the RAP material twice, and prevent the new aggregate and the RAP material from wrapping more new asphalt on the new aggregate and less new asphalt on the RAP material due to different adsorption forces on the new asphalt.
Detailed Description
The present invention will be described in further detail with reference to examples.
Preparation examples 1 to 3 of regenerants
The tung oil in preparation examples 1-3 was selected from lc-0001 type tung oil sold by Shandong Green City chemical Co., Ltd, the turpentine was selected from AOX-68 type turpentine sold by soaring chemical Co., Ltd, the cycloalkyl rubber oil was selected from KN4010 type cycloalkyl rubber oil sold by Shanghai Judo chemical Co., Ltd, the alkylated diphenylamine antioxidant was selected from T534 type alkylated diphenylamine antioxidant sold by Shengda chemical Co., Ltd, the SBS modifier is selected from YH-801 SBS modifier sold by Ming-ministry of Plastic materials of Huangjiang Shengbang in Dongguan city, the ultraviolet absorbent is selected from UV-531 ultraviolet absorbent sold by Kangjin new material science and technology Limited in Dongguan city, the styrene butadiene rubber powder is selected from YDH-SBR type styrene butadiene rubber powder sold by Beijing Yudao industry Limited, and the hollow glass beads are selected from hollow glass beads sold by Hefeng Henghe product processing factories in Lingshu county with the product number fj 032.
Preparation example 1: adding 80kg of base oil, 10kg of surfactant and 10kg of dispersant into a reactor according to the mixture ratio in the table 1, heating to 150 ℃, stirring for 20min at 1000r/min, and uniformly stirring, wherein the base oil is a mixture consisting of tung oil, turpentine and rubber oil in a mass ratio of 2:1:3, the rubber oil is cycloalkyl rubber oil, the surfactant is hexadecyltrimethylammonium chloride, and the dispersant is a mixture consisting of stearamide and n-butyl alcohol in a mass ratio of 0.5: 15;
(2) stirring 10kg of styrene butadiene rubber powder and 5kg of hollow glass beads for 30min at the rotating speed of 500r/min, adding the mixture into a reactor, sequentially adding 0.1kg of dicumyl peroxide and 10kg of absolute ethyl alcohol into the reactor, stirring the mixture for 30min at the rotating speed of 800r/min at the temperature of 140 ℃, naturally cooling the mixture to 60 ℃, adding 0.5kg of dichloromethane, 0.5kg of SBS modifier, 10kg of ultraviolet absorbent and 1.0kg of alkylated diphenylamine antioxidant, continuously stirring the mixture for 30min, and extruding a regenerant in an extruder at the temperature of 120 ℃; wherein the particle size of the styrene-butadiene rubber powder is 180 mu m, the particle size of the hollow glass bead is 150 mu m, and the particle size of the regenerant is 2 cm.
TABLE 1 compounding ratio of raw materials for regenerants in preparation examples 1-3
Preparation example 2: adding 90kg of base oil, 13kg of surfactant and 15kg of dispersant into a reactor according to the mixture ratio in the table 1, heating to 160 ℃, stirring for 25min at 1300r/min, and uniformly stirring, wherein the base oil is a mixture consisting of tung oil, turpentine and rubber oil in a mass ratio of 3:1.3:4, the rubber oil is cycloalkyl rubber oil, the surfactant is octadecyl trimethyl ammonium chloride, and the dispersant is a mixture consisting of stearamide and n-butyl alcohol in a mass ratio of 0.8: 18;
(2) stirring 15kg of styrene butadiene rubber powder and 8kg of hollow glass beads for 35min at the rotating speed of 700r/min, adding the mixture into a reactor, sequentially adding 0.3kg of dicumyl peroxide and 15kg of absolute ethyl alcohol into the reactor, stirring the mixture at the rotating speed of 900r/min for 40min at the temperature of 160 ℃, naturally cooling the mixture to 70 ℃, adding 1.0kg of dichloromethane, 1.0kg of SBS modifier, 20kg of ultraviolet absorbent and 3.0kg of alkylated diphenylamine antioxidant, continuously stirring the mixture for 40min, and extruding a regenerant in an extruder at the temperature of 130 ℃, wherein the particle size of the styrene butadiene rubber powder is 190 mu m, and the particle size of the regenerant with the particle size of 124 mu m of the hollow glass beads is 3 cm.
Preparation example 3: adding 100kg of base oil, 15kg of surfactant and 20kg of dispersant into a reactor according to the mixture ratio in the table 1, heating to 170 ℃, stirring for 30min at 1500r/min, and uniformly stirring, wherein the base oil is a mixture consisting of tung oil, turpentine and rubber oil in a mass ratio of 4:1.5:5, the rubber oil is cycloalkyl rubber oil, the surfactant is octodecyl trimethyl ammonium chloride, and the dispersant is a mixture consisting of stearamide and n-butyl alcohol in a mass ratio of 1: 20;
(2) stirring 20kg of styrene butadiene rubber powder and 10kg of hollow glass beads for 40min at the rotating speed of 800r/min, adding the mixture into a reactor, sequentially adding 0.5kg of dicumyl peroxide and 20kg of absolute ethyl alcohol into the reactor, stirring the mixture for 50min at the rotating speed of 1000r/min at the temperature of 180 ℃, naturally cooling the mixture to 80 ℃, adding 2.0kg of dichloromethane, 1.5kg of SBS modifier, 30kg of ultraviolet absorbent and 5.0kg of alkylated diphenylamine antioxidant, continuously stirring the mixture for 50min, and extruding a regenerant in an extruder at the temperature of 140 ℃, wherein the particle size of the styrene butadiene rubber powder is 200 mu m, the particle size of the hollow glass beads is 104 mu m, and the particle size of the regenerant is 4 cm.
Examples
The glass fiber is selected from 44954-grade glass fiber sold by Shih Wei chemical fiber rope net factory in Qinghe town of Huimin county, the ceramic micropowder is selected from Shanghai Huizi Jing sub-nanometer new material company, the silicon dioxide is selected from A130-grade silicon dioxide sold by Shijiazhuan Chenxi refractory material company, the steel slag is selected from 005-grade steel slag sold by Bailing mineral product processing factory in Lingshu county, the mineral powder is selected from KZF 01-grade mineral powder sold by Jinyuan mineral processing factory in Lingshu county, and the performance indexes of 70-grade asphalt and SBS modified asphalt are respectively shown in Table 2 and Table 3.
Performance index for asphalt No. 270 of Table
| Index (I) | No. 70 asphalt |
| Density (15 ℃ C./(g/cm)3) | 1.036 |
| Flash point/. degree.C | ＞300 |
| Wax content (distillation method)/%) | 1.90 |
| Ductility per cm at 10 DEG C | 36.4 |
| Penetration index PI value | -1.041 |
| Dynamic viscosity/pas at 60 DEG C | 222 |
| post-TFOT mass change/%) | -0.079 |
| Residual penetration ratio after TFOT (25 ℃ C.,%) | 76.41 |
| Residual ductility after TFOT (10 ℃, cm) | 9.8 |
| Solubility/%) | 99.97 |
TABLE 3 Performance index of SBS modified asphalt
| Index (I) | SBS modified asphalt |
| Flash point/. degree.C | ＞300 |
| Elastic recovery of 25 deg.C | 825 |
| Kinematic viscosity 135 ℃/Pa s | 222 |
| post-TFOT mass change/%) | -0.1 |
| Residual penetration ratio after TFOT (25 ℃ C.,%) | 72 |
| Residual ductility after TFOT (5 ℃, cm) | 17 |
| Solubility/%) | 99.75 |
Example 1: the preparation method of the heat-resistant recycled asphalt concrete comprises the following steps:
s1, collecting RAP materials: milling damaged old asphalt aggregates according to the proportion in the table 4, and carrying out classified screening to form 50kgRAP materials, wherein the RAP materials comprise 30% of RAP materials with the particle size of 1mm, 40% of RAP materials with the particle size of 8mm and 30% of RAP materials with the particle size of 15 mm; the oilstone ratio of an RAP material with the particle size of 1mm is 3 percent, the oilstone ratio of an RAP material with the particle size of 8mm is 3.5 percent, and the oilstone ratio of an RAP material with the particle size of 15mm is 2.8 percent;
s2: preparing a first mixture: drying 10kg of new aggregate at 140 ℃ for 5min, and uniformly stirring with 36kg of No. 70 asphalt to obtain a first mixture; the new aggregate comprises 10kg of limestone with the grain diameter of 1mm, 20kg of limestone with the grain diameter of 3mm, 5kg of basalt with the grain diameter of 5kg and 5kg of basalt with the grain diameter of 10 mm;
s3, preparing a second mixture: preheating 2kg of regenerant at 110 ℃ for 10min, drying RAP material at 100 ℃ for 30min, heating 10kg of steel slag at 180 ℃ for 5min, mixing the preheated regenerant, RAP material and steel slag, adding the mixed regenerant, RAP material and steel slag into the first mixture, stirring and uniformly mixing to obtain a second mixture, wherein the regenerant is prepared by the preparation example 1;
s4, preparing a third mixture: adding the residual 24kg of No. 70 asphalt into the second mixture, and uniformly mixing to obtain a third mixture;
s5, preparing a finished product: preheating 4kg of mineral powder at 140 ℃ for 5min, adding the mineral powder into a third mixture, uniformly mixing, adding 3kg of glass fiber, 10kg of ceramic micro powder and 1kg of silicon dioxide, and uniformly mixing to obtain the recycled asphalt concrete, wherein the length of the glass fiber is 3mm, the particle size of the ceramic micro powder is 0.2 mu m, and the particle size of the silicon dioxide is 5.5 mu m.
TABLE 4 raw material composition of heat-resistant recycled asphalt concrete in examples 1 to 5
Example 2: the preparation method of the heat-resistant recycled asphalt concrete comprises the following steps:
s1, collecting RAP materials: milling damaged old asphalt aggregates according to the proportion in the table 4, and carrying out classified screening to form 70kgRAP materials, wherein the RAP materials comprise 30% of RAP materials with the particle size of 5mm, 40% of RAP materials with the particle size of 12mm and 30% of RAP materials with the particle size of 20 mm; the oilstone ratio of RAP material with the particle size of 5mm is 3.5%, the oilstone ratio of RAP material with the particle size of 12mm is 3.8%, and the oilstone ratio of RAP material with the particle size of 20mm is 3.0%;
s2: preparing a first mixture: drying 13kg of new aggregate at 150 ℃ for 8min, and uniformly stirring with 42kg of No. 70 asphalt to obtain a first mixture; the new aggregate comprises 13kg of limestone with the grain diameter of 2mm, 25kg of limestone with the grain diameter of 4mm, 8kg of basalt with the grain diameter of 8kg and 8kg of basalt with the grain diameter of 14 mm;
s3, preparing a second mixture: preheating 3kg of regenerant at 120 ℃ for 13min, drying RAP material at 110 ℃ for 35min, heating 12kg of steel slag at 190 ℃ for 8min, mixing the preheated regenerant, RAP material and steel slag, adding the mixed regenerant, RAP material and steel slag into the first mixture, stirring and uniformly mixing to obtain a second mixture, wherein the regenerant is prepared by the preparation example 2;
s4, preparing a third mixture: adding the remaining 28kg of No. 70 asphalt into the second mixture, and uniformly mixing to obtain a third mixture;
s5, preparing a finished product: preheating 5kg of mineral powder at 150 ℃ for 8min, adding the mineral powder into a third mixture, uniformly mixing, adding 4kg of glass fiber, 12kg of ceramic micro powder and 3kg of silicon dioxide, and uniformly mixing to obtain the recycled asphalt concrete, wherein the length of the glass fiber is 6mm, the particle size of the ceramic micro powder is 0.3 mu m, and the particle size of the silicon dioxide is 5.5 mu m.
Example 3: the raw material formulation of the heat-resistant recycled asphalt concrete is shown in Table 4, and the preparation method of the heat-resistant recycled concrete comprises the following steps:
s1, collecting RAP materials: milling damaged old asphalt aggregates according to the proportion in the table 4, and carrying out classified screening to form 75kgRAP materials, wherein the RAP materials comprise 30% of RAP materials with the particle size of 8mm, 40% of RAP materials with the particle size of 15mm and 30% of RAP materials with the particle size of 25 mm; the oilstone ratio of an RAP material with the particle size of 8mm is 4%, the oilstone ratio of an RAP material with the particle size of 15mm is 4.1%, and the oilstone ratio of an RAP material with the particle size of 25mm is 3.2%;
s2: preparing a first mixture: drying 15kg of new aggregate at 160 ℃ for 10min, and uniformly stirring the new aggregate and 45kg of No. 70 asphalt to obtain a first mixture; the new aggregate comprises 15kg of limestone with the grain diameter of 3mm, 30kg of limestone with the grain diameter of 5mm, 10kg of basalt with the grain diameter of 10kg and 10kg of basalt with the grain diameter of 16 mm;
s3, preparing a second mixture: preheating 4kg of regenerant at 130 ℃ for 15min, drying RAP material at 120 ℃ for 40min, heating 15kg of steel slag at 210 ℃ for 10min, mixing the preheated regenerant, RAP material and steel slag, adding the mixed regenerant, RAP material and steel slag into the first mixture, stirring and uniformly mixing to obtain a second mixture, wherein the regenerant is prepared by the preparation example 3;
s4, preparing a third mixture: adding the rest 30kg of No. 70 asphalt into the second mixture, and uniformly mixing to obtain a third mixture;
s5, preparing a finished product: preheating 6kg of mineral powder at 160 ℃ for 10min, adding the mineral powder into a third mixture, uniformly mixing, adding 6kg of glass fiber, 15kg of ceramic micro powder and 3kg of silicon dioxide, and uniformly mixing to obtain the recycled asphalt concrete, wherein the length of the glass fiber is 9mm, the particle size of the ceramic micro powder is 0.4 mu m, and the particle size of the silicon dioxide is 5.5 mu m.
Examples 4 to 5: a heat-resistant recycled asphalt concrete, which is different from example 1 in that the raw material formulation is shown in table 4, and the preparation method of the heat-resistant recycled asphalt concrete is the same as example 1.
Example 6: the heat-resistant recycled asphalt concrete is different from the example 1 in that the new asphalt is SBS modified asphalt, and the preparation method of the heat-resistant recycled asphalt concrete is the same as the example 1.
Comparative example
Comparative example 1: the difference between the heat-resistant recycled asphalt concrete and the recycled asphalt concrete in example 1 is that steel slag is not added in the raw materials.
Comparative example 2: the difference between the heat-resistant recycled asphalt concrete and the example 1 is that the ceramic micropowder is not added in the raw materials.
Comparative example 3: the heat-resistant recycled asphalt concrete is different from the recycled asphalt concrete in example 1 in that hollow glass beads are not added into the recycling agent.
Comparative example 4: the heat-resistant recycled asphalt concrete is different from the recycled asphalt concrete in example 1 in that no dichloromethane is added into the recycling agent.
Comparative examples 5 to 10: a heat-resistant reclaimed asphalt concrete which is different from that of example 1 in that the mass ratio of tung oil, turpentine and naphthenic rubber oil in the base oil as the raw material of the reclaiming agent is shown in Table 5 (in the table, "/" indicates that no such substance is contained).
TABLE 5 Mass ratios of tung oil, turpentine oil and naphthenic rubber oil in comparative examples 5-10
Performance test
Recycled asphalt concretes were prepared according to the methods of examples 1 to 6 and comparative examples 1 to 10, and the properties of the recycled asphalt concretes were tested according to the following criteria, the test results of the recycled asphalt concretes prepared in examples 1 to 6 are shown in Table 6, and the test results of the recycled asphalt concretes prepared in comparative examples 1 to 10 are shown in Table 6:
1. penetration degree: testing according to GB/T4509-2010 asphalt penetration testing method;
2. measuring according to GB/T4507-2010 asphalt softening point measuring method;
3. ductility: the measurement is carried out according to GB/T4508-2010 asphalt ductility determination method, and the detection results are shown in Table 6;
4. freeze-thaw split residual strength ratio: measuring according to a method of T0729-2000 in JTJ052-2000 test procedures for road engineering asphalt and asphalt mixtures;
5. immersion marshall residual stability: measuring according to T0709-2000 Marshall stability test for asphalt mixture;
6. dynamic stability: measuring according to T0719-2011 in JTGE20-2011 road engineering asphalt and asphalt mixture test procedures;
7. and (3) fatigue test: according to NFP98-261-1, determination of fatigue resistance of asphalt mixture part I: the measurement was carried out by the constant-winding bending variation test.
TABLE 6 Performance test results of the heat-resistant recycled asphalt concrete prepared in each example and each comparative example
As can be seen from the data in Table 6, the heat-resistant recycled asphalt concrete prepared by the method in the embodiments 1 to 6 has high softening point which is more than 94 ℃, penetration which is less than 27mm, ductility which is more than 56/cm at 10 ℃, better freeze-thaw cleavage strength ratio, better water-soaked Marshall residual stability, better dynamic stability and better fatigue resistance, and the heat-resistant recycled asphalt concrete prepared by the method in the invention has good heat resistance, rutting deformation resistance, aging resistance and durability.
Comparative example 1 because no steel slag is added to the heat-resistant recycled asphalt concrete, the penetration of the heat-resistant recycled asphalt concrete is obviously increased compared with that of example 1, the softening point is reduced to 68 ℃, the ductility at 10 ℃, the freeze-thaw splitting strength ratio, the water immersion marshall residual stability and other performance detection results are obviously worse compared with example 1, and the fatigue test value is reduced, which shows that the incorporation of the steel slag can obviously improve the heat resistance, the rutting deformation resistance and the aging resistance of the heat-resistant recycled asphalt concrete, so that the pavement performance of the heat-resistant recycled asphalt concrete is better.
Comparative example 2 because ceramic micro powder is not added to the heat-resistant recycled asphalt concrete, the softening point and the 10 ℃ ductility of the heat-resistant recycled asphalt concrete prepared by the comparative example 2 are obviously reduced, the penetration is increased, and the freeze-thaw splitting strength ratio, the fatigue test and other performances are all deteriorated, which shows that the addition of the ceramic micro powder can improve the rutting deformation resistance, the fatigue resistance and the high temperature resistance of the heat-resistant recycled asphalt concrete.
Comparative example 3 since the hollow glass microspheres are not added to the recycling agent, the heat-resistant recycled asphalt concrete prepared in comparative example 3 has increased penetration, decreased softening point and 10 ℃ ductility, obviously decreased freeze-thaw cleavage strength ratio and water-soaked marshall residual stability, compared with the heat-resistant recycled asphalt concrete prepared in the examples, so that the hollow glass microspheres can improve the softening point of the heat-resistant recycled asphalt concrete, reduce penetration, and increase the heat resistance, rutting deformation resistance and durability of the recycled asphalt concrete.
Comparative example 4 since dichloromethane was not added during the regeneration, the penetration and 10 ℃ ductility test results of the heat-resistant recycled asphalt concrete prepared in comparative example 4 were inferior to those of example 1, indicating that dichloromethane can improve the high temperature resistance, durability and rutting deformation resistance of the heat-resistant recycled asphalt concrete.
Comparative example 5 because the naphthenic base rubber oil is not added to the base oil, comparative example 6 because the turpentine oil is not added to the base oil, the performances of the heat-resistant recycled asphalt concrete prepared in comparative example 5 and comparative example 6 are inferior to those of example 1, which shows that the naphthenic base rubber oil and the turpentine oil can improve the high temperature resistance and the anti-rutting deformation capability of the heat-resistant recycled asphalt concrete, and can enable the heat-resistant recycled asphalt concrete to have stronger crack resistance and durability, comparative example 3 because the naphthenic base rubber oil and the turpentine oil are not added to the base oil at the same time, the performance test result of the heat-resistant recycled asphalt concrete prepared in comparative example 3 is inferior to that of the heat-resistant recycled asphalt concrete prepared in comparative example 1 and comparative example 2, which shows that the naphthenic base rubber oil and the turpentine oil have good compounding effect, and the naphthenic base rubber oil and the turpentine oil are used, can obviously improve the high temperature resistance, the rutting deformation resistance, the durability and the crack resistance of the heat-resistant recycled asphalt concrete.
In comparative example 8, the base oil is not added with the tung oil, the heat-resistant recycled asphalt concrete prepared in comparative example 8 is poorer in various performances than that in example 1, and in comparative example 9, the base oil is not added with the tung oil and the turpentine, and the test results of the heat-resistant recycled asphalt concrete prepared in comparative example 9 are poorer than those of the heat-resistant recycled asphalt concrete prepared in comparative example 8 and comparative example 6, so that the mutual cooperation of the tung oil and the turpentine is proved, and the heat resistance, the rutting deformation resistance and the durability of the heat-resistant recycled asphalt concrete can be obviously improved.
Comparative example 10 because tung oil and naphthenic base rubber oil are not added to the base oil at the same time, the heat-resistant recycled asphalt concrete prepared by the comparative example 10 has poorer performance test results than the heat-resistant recycled asphalt concrete prepared by the comparative examples 5 and 8, which shows that the tung oil and the naphthenic base rubber oil have synergistic effect, and can improve the heat resistance, the anti-rutting deformation capability and the anti-aging performance of the heat-resistant recycled 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 (10)
1. The heat-resistant recycled asphalt concrete is characterized by comprising the following components in parts by weight: 60-90 parts of new asphalt, 50-70 parts of RAP material, 2-6 parts of regenerant, 10-20 parts of steel slag, 10-20 parts of ceramic micro powder, 4-9 parts of mineral powder, 10-20 parts of new aggregate, 1-5 parts of silicon dioxide and 3-8 parts of glass fiber;
the regenerant comprises the following components in parts by weight: 80-100 parts of base oil, 10-20 parts of dispersing agent, 1-5 parts of alkylated diphenylamine antioxidant, 0.5-2 parts of dichloromethane, 10-30 parts of ultraviolet absorbent, 0.1-0.5 part of dicumyl peroxide, 10-15 parts of surfactant, 0.5-1.5 parts of SBS modifier, 10-20 parts of absolute ethyl alcohol, 10-20 parts of styrene butadiene rubber powder and 5-10 parts of hollow glass beads.
2. The heat-resistant recycled asphalt concrete according to claim 1, wherein the recycling agent is prepared by the following method: (1) adding base oil, a surfactant and a dispersant into a reactor, heating to 150-;
(2) stirring styrene-butadiene rubber powder and hollow glass beads for 30-40min at the rotating speed of 800r/min of 500-.
3. The heat-resistant recycled asphalt concrete according to claim 2, wherein the base oil is a mixture of tung oil, turpentine and rubber oil in a mass ratio of (2-4) to (1-1.5) to (3-5), and the rubber oil is naphthenic rubber oil.
4. The heat-resistant recycled asphalt concrete according to claim 2, wherein the dispersant is formed by mixing (0.5-1): 15-20) by mass of stearamide and a higher alcohol, and the higher alcohol is one of n-butanol, isobutanol, isoamyl alcohol and n-propanol.
5. The heat-resistant recycled asphalt concrete according to claim 2, wherein the surfactant is one or a mixture of two of cetyltrimethylammonium chloride and octadecyltrimethylammonium chloride.
6. The heat resistant recycled asphalt concrete according to claim 1, wherein the RAP material comprises 30% RAP material with particle size of 1-8mm, 40% RAP material with particle size of 8-15mm and 30% RAP material with particle size of 15-25 mm.
7. The heat-resistant recycled asphalt concrete according to claim 6, wherein the oilstone ratio of 1-8mmRAP is 3-4%, the oilstone ratio of 8-15mmRAP is 3.5-4.1%, and the oilstone ratio of 15-25mmRAP is 2.8-3.2%.
8. The heat-resistant recycled asphalt concrete according to claim 1, wherein the new asphalt is one of No. 70 asphalt and SBS modified asphalt.
9. The heat-resistant recycled asphalt concrete according to claim 1, wherein the new aggregate comprises 10-15 parts of 1-3mm limestone, 20-30 parts of 3-5mm limestone, 5-10 parts of 5-10mm basalt and 5-10 parts of 10-16mm basalt.
10. A method for preparing a heat-resistant recycled asphalt concrete according to any one of claims 1 to 9, comprising the steps of:
s1, collecting RAP materials: milling damaged old asphalt aggregate, and performing grading screening to form RAP material;
s2: preparing a first mixture: drying the new aggregate at the temperature of 140-160 ℃ for 5-10min, and uniformly stirring the new aggregate and 60% of new asphalt to prepare a first mixture;
s3, preparing a second mixture: preheating the regenerant at the temperature of 110-;
s4, preparing a third mixture: adding the residual 40% of the fresh asphalt into the second mixture, and uniformly mixing to obtain a third mixture;
s5, preparing a finished product: and (3) preheating the mineral powder at the temperature of 140 ℃ and 160 ℃ for 5-10min, adding the mineral powder into the third mixture, uniformly mixing, adding glass fiber, ceramic micro powder and silicon dioxide, and uniformly mixing to obtain the recycled asphalt concrete.
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| TWI710539B (en) * | 2019-06-05 | 2020-11-21 | 輔英科技大學 | Insulation bricks made from inorganic slag and sludge |
| CN110700033A (en) * | 2019-09-06 | 2020-01-17 | 北京中天路业科技有限公司 | Method for preparing durable asphalt concrete old material regeneration additive by utilizing waste tire rubber powder |
| CN110922098B (en) * | 2019-11-21 | 2021-08-31 | 宏辉建材有限公司 | Regenerated asphalt mixture and preparation method thereof |
| CN110790535B (en) * | 2019-12-05 | 2021-07-06 | 广东高翔建设有限公司 | Maintenance method of asphalt road |
| CN111505253A (en) * | 2020-03-25 | 2020-08-07 | 东南大学 | Evaluation method for distribution uniformity of regenerant in aged asphalt |
| CN112321201B (en) * | 2020-11-25 | 2021-08-20 | 宁波东兴沥青制品有限公司 | High-density asphalt concrete and preparation method thereof |
| CN112960940B (en) * | 2021-02-07 | 2023-04-07 | 枣阳市锦烨节能建材有限公司 | Recycled asphalt concrete and preparation method thereof |
| CN113372041A (en) * | 2021-07-13 | 2021-09-10 | 上海繁荣道路建设工程有限公司 | Asphalt mixture and preparation method thereof |
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