CN114057427A - High-modulus asphalt concrete and asphalt concrete mold-increasing agent - Google Patents
High-modulus asphalt concrete and asphalt concrete mold-increasing agent Download PDFInfo
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- CN114057427A CN114057427A CN202111438876.0A CN202111438876A CN114057427A CN 114057427 A CN114057427 A CN 114057427A CN 202111438876 A CN202111438876 A CN 202111438876A CN 114057427 A CN114057427 A CN 114057427A
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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
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
- C04B40/0039—Premixtures of ingredients
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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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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C11/00—Details of pavings
- E01C11/005—Methods or materials for repairing pavings
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/72—Repairing or restoring existing buildings or building materials
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Abstract
The invention provides high-modulus asphalt concrete and an asphalt concrete mold-increasing agent, wherein the mold-increasing agent comprises the following raw materials in parts by weight: 300-600 parts of a swelling agent; 30-60 parts of polyethylene; 20-50 parts of polypropylene; 10-30 parts of polyethylene terephthalate; 10-15 parts of unsaturated carboxylic acid or unsaturated carboxylic acid derivative; 0.2-3 parts of a stabilizer; 0.5-1 part of an activating agent; 0.1-0.4 part of antioxidant, the high-modulus asphalt concrete and asphalt concrete mold-increasing agent can obviously improve the resilience modulus of asphalt concrete materials, reduce the strain generated by the asphalt concrete under the action of vehicle load, reduce the unrecoverable residual deformation of the asphalt concrete, and improve the high-temperature deformation resistance of asphalt pavements.
Description
Technical Field
The invention relates to the technical field of asphalt pavements, in particular to high-modulus asphalt concrete and an asphalt concrete mold-enlarging agent.
Background
With the increasing road traffic volume and the development of transportation towards heaviness, especially the operation of high-grade road canalization traffic, the permanent deformation of the asphalt pavement becomes a prominent problem. The traditional asphalt pavement is difficult to be applied to the development of modern traffic industry, and various diseases come with the traditional asphalt pavement after a plurality of highway asphalt pavements are built, so that the driving speed and the driving safety are seriously influenced, and the service life of the asphalt pavement is shortened. The common asphalt pavement diseases are shown in figures 1-3, wherein figure 1 shows the common form of tracks in the asphalt pavement, figure 2 shows the common form of a cuddle in the asphalt pavement, and figure 3 shows the common form of a push in the asphalt pavement.
In order to improve the service quality of the asphalt pavement in the service period, prolong the service life and adapt to the continuous development of road traffic, the effective method is to improve the pavement performance of the asphalt mixture. The modulus of the asphalt mixture can be improved by the aid of the mold-increasing modifier, so that deformation of the asphalt mixture under the action of vehicle load is reduced, high-temperature deformation resistance of a pavement is improved, bending tensile stress of the bottom of an asphalt surface layer is reduced, and the service life of the pavement is prolonged.
Under the action of actual driving load, the change of the elastic modulus of each structural layer material of the pavement can cause the change of the response of the asphalt surface layer to the load. For high modulus asphalt concrete, the modulus of the asphalt concrete is increased with the addition of the modulus increasing agent. Because the shear stress on the surface layer is the largest, the influence of the change of the modulus of the surface layer on each index is considered. From the numerical simulation results, the changes of the shear stress and the shear strain of the surface layer with the increase of the modulus are shown in fig. 4.
As can be seen from fig. 4, the change in modulus of the asphalt concrete surface layer has a large influence on the shear strain, and as the modulus of the surface layer increases, the change in the value of the shear stress in the surface layer is small, but the shear strain decreases sharply. Therefore, the modulus of the surface layer structure is improved, and the shear deformation and the compression deformation of the asphalt surface layer can be effectively controlled, so that the occurrence of asphalt pavement diseases is reduced.
In addition, the asphalt pavement diseases generated need to be repaired in time so as to avoid influencing the driving speed and the driving safety. The main problem in the repair process of asphalt pavement diseases is that the compactness and the deformation resistance of the existing pavement are poor, so that the phenomena of easy falling, cracking and the like of pits, cracks and the like after repair are caused, and repeated repair is needed.
The present application is proposed to solve the above technical problems.
Disclosure of Invention
The invention designs high-modulus asphalt concrete and an asphalt concrete mold-increasing agent, so as to achieve the purposes of improving the modulus of the asphalt concrete, reducing the occurrence of asphalt pavement diseases and repairing the generated asphalt pavement diseases.
In order to solve the problems, the invention discloses an asphalt concrete mold-enlarging agent which comprises the following raw materials in parts by weight:
further, the mold-increasing agent further comprises: 1-3 parts by weight of a coupling agent.
Further, the mold-increasing agent is prepared according to the following method:
s1, weighing the raw materials for preparing the die-increasing agent according to the parts by weight;
s2, swelling polyethylene, polypropylene and polyethylene terephthalate;
s3, adding unsaturated carboxylic acid or unsaturated carboxylic acid derivative, stabilizer, activator and antioxidant into the mixture system obtained in the step S2;
s4, evaporating to remove the swelling agent, and obtaining a swelling polymer system after evaporation treatment;
s5, introducing the swollen polymer system obtained in the step S4 into an extruder, extruding the swollen polymer system by the extruder, and granulating to obtain the die-increasing agent particles.
Further, the step S2 includes: adding the polyethylene, the polypropylene, the polyethylene terephthalate and the swelling agent into a swelling kettle, stirring at the speed of 500-700 r/min, heating to 60-80 ℃, keeping the temperature, stirring at the speed of 500-700 r/min for 2-3 hours, stirring at the speed of 500-700 r/min, heating to 110-120 ℃, keeping the temperature, and stirring at the speed of 100-200 r/min for 2-3 hours.
The high modulus asphalt concrete comprises the following raw materials in parts by weight:
wherein the mold-increasing agent is the mold-increasing agent.
Further, the aggregate is stone with a microporous structure.
Further, the asphalt concrete is prepared according to the following method:
t1, heating the aggregate to more than 180 ℃, preserving heat for 3-5 min, and adding the aggregate into mixing equipment for stirring;
t2, adding the phase change material into the mixing equipment, and mixing for 1-3 min;
t3, adding a mold extender into the mixing equipment, and mixing for 5-10 seconds;
t4, adding mineral powder into the mixing equipment, and mixing for 5-10 seconds;
t5, adding the matrix asphalt, the stabilizer and the curing agent into the mixing equipment, and mixing for 30 seconds at the temperature of over 160 ℃ to obtain the asphalt.
Further, the process for repairing the pavement diseases by adopting the high-modulus asphalt concrete comprises the following steps:
p1, recognizing and cleaning the asphalt pavement diseases to form pits or cracks to be repaired;
p2, heating the pit or the crack to be repaired;
p3, preparing asphalt concrete for repairing;
p4, spraying asphalt concrete for repairing into the pit or crack to be repaired;
and P5, performing rolling finishing on the repaired pavement.
Further, in the step P2, the inner surface of the pit or the crack to be repaired is heated to above 120 ℃, and the temperature is kept for 1-3 min.
Further, in the step P4, when the repair asphalt concrete is sprayed into the pit or crack to be repaired by using a high-pressure sprayer, the speed of spraying the repair asphalt concrete from the high-pressure sprayer should be not less than 100 m/s.
The high modulus asphalt concrete and the asphalt concrete mold-increasing agent have the following advantages: the mold-increasing agent can remarkably improve the resilience modulus of asphalt concrete materials, reduce the strain generated by asphalt concrete under the action of vehicle load, reduce the unrecoverable residual deformation of the asphalt concrete and improve the high-temperature deformation resistance of asphalt pavements by the interface modification effect, the reinforcement effect, the alloy lattice distortion strengthening matrix effect, the absorption effect of light oil in asphalt and the embedding and extruding effect.
Drawings
FIG. 1 is a diagram of a common form of ruts in an asphalt pavement;
FIG. 2 is a common form of a hug in an asphalt pavement;
FIG. 3 is a common form of pushing in an asphalt pavement;
FIG. 4 is a graph of shear strain and shear stress as a function of elastic modulus;
FIG. 5 is a diagram of a physical embodiment of the molding compound of the present application;
FIG. 6 is a schematic diagram of the mechanism of action of the templating agent described herein;
FIG. 7 is a flow chart of a method of repairing a roadway surface according to the present application;
FIG. 8 is a diagram showing a sample of a test piece in comparative example 1 of the present application.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
The application provides an asphalt concrete mold-increasing agent, the raw materials are counted according to part by weight, mold-increasing agent includes:
preferably, the mold agent comprises the following raw materials in parts by weight:
more preferably, the mold agent comprises the following raw materials in parts by weight:
preferably, the swelling agent is one of cyclohexane, kerosene, diesel oil, gasoline and white oil.
Preferably, the unsaturated carboxylic acid derivative is an α, β -unsaturated carboxylic acid derivative having a cyclic structure, such as maleic anhydride or the like.
Preferably, the stabilizer is a fatty acid soap stabilizer or an organotin stabilizer.
Preferably, the activator is phenol or ethylenediamine.
Preferably, the antioxidant is an aromatic amine antioxidant.
In addition, the mold-enlarging agent further comprises: 1-3 parts by weight of a coupling agent.
Preferably, the coupling agent is a silane coupling agent, and the stability and the adhesion of the mold-expanding agent can be improved by adding the coupling agent.
Further, the mold-increasing agent is prepared according to the following method:
s1, weighing the raw materials for preparing the die-increasing agent according to the parts by weight;
s2, swelling polyethylene, polypropylene and polyethylene terephthalate;
s3, adding unsaturated carboxylic acid or unsaturated carboxylic acid derivative, stabilizer, activator and antioxidant into the mixture system obtained in the step S2;
s4, evaporating to remove the swelling agent, and obtaining a swelling polymer system after evaporation treatment;
s5, introducing the swollen polymer system obtained in the step S4 into an extruder, extruding the swollen polymer system by the extruder, and granulating to obtain the die-increasing agent particles.
Specifically, the step S2 includes: adding the polyethylene, the polypropylene, the polyethylene terephthalate and the swelling agent into a swelling kettle, stirring at the speed of 500-700 r/min, heating to 60-80 ℃, keeping the temperature, stirring at the speed of 500-700 r/min for 2-3 hours, stirring at the speed of 500-700 r/min, heating to 110-120 ℃, keeping the temperature, and stirring at the speed of 100-200 r/min for 2-3 hours.
In the swelling treatment process of the polyethylene, the polypropylene and the polyethylene terephthalate, the swelling treatment process is divided into two stages, in the first stage, molecular chains of the polymer are fully unwound through low-temperature pre-swelling and high-speed stirring, the interaction force among the macromolecular chains is reduced, and a foundation is provided for the swelling agent to fully permeate and diffuse into the polymer in the swelling process of the second stage; in the second stage, the swelling agent is promoted to rapidly permeate and diffuse into the polymer through high-temperature swelling, and simultaneously, the macromolecular chains of the polymer are prevented from being excessively cut through low-speed stirring, so that the modulus and the adhesion of the mold-increasing agent are reduced.
Further, the step S3 includes: and (3) adding unsaturated carboxylic acid or unsaturated carboxylic acid derivative, stabilizer, activator and antioxidant into the mixture system obtained in the step S2, preserving the temperature at 110-120 ℃, and stirring at the speed of 100-200 r/min for 0.2-0.5 h.
Further, the step S4 includes: heating and evaporating at 60-90 ℃ to remove the swelling agent, and obtaining a swelling polymer system after evaporation treatment.
Further, the step S5 includes: and (4) extruding the swollen polymer system obtained in the step S4 through a double-screw extruder, removing heat from the material extruded by the double-screw extruder, and extruding through a granulation die head to obtain the die-increasing agent particles.
Further, in the step S5, the gap width between the screws in the twin-screw extruder should be controlled to control the crystallinity of the polymer in the die-casting agent.
Preferably, in the step S5, the gap width between the screws in the twin-screw extruder should be controlled to be 0.75 to 1 times the thickness of the extrudate, so that the crystallinity of the polymer in the die-casting agent can be controlled to be more than 20%. According to the application, in the process of extruding and granulating a polymer system through a double-screw extruder, the double-screw extruder is utilized to give a certain compression force to the polymer system, and the crystallization process of the polymer is promoted and controlled through the compression force, so that the modulus of the die-increasing agent is improved.
The mold-enlarging agent is an asphalt concrete modifier compounded by various high molecular polymers, is dark black solid particles, and has the particle size range of 4.80mm-1.80 mm. FIG. 5 of the present application shows a physical representation of the molding compound (prepared according to the specific process described in example 1). The modulus enhancer is doped into asphalt, so that the modulus of resilience of an asphalt concrete material can be obviously improved, the strain generated by the asphalt concrete under the action of vehicle load is reduced, the unrecoverable residual deformation of the asphalt concrete is reduced, the high-temperature deformation resistance of an asphalt pavement is improved, the obvious bearing performance can be embodied on a road section with large traffic volume, high overload and heavy load proportion and slow vehicle speed, the generation of pavement diseases such as rutting, cuddling and the like is delayed, and the maintenance period and the service life of the pavement are prolonged.
In addition, this application still provides a high modulus asphalt concrete, raw materials by weight portion, asphalt concrete includes:
wherein the mold-increasing agent is the mold-increasing agent.
Preferably, the asphalt concrete comprises the following raw materials in parts by weight:
preferably, the aggregate is stone with a microporous structure.
As some examples herein, the aggregate is zeolite, limonite tailings, or the like.
Preferably, the stabilizer is one or more of ethylene propylene diene monomer, nitrile rubber, sulfur, rubber powder and barium stearate.
Preferably, the curing agent is a polyurethane curing agent, and the addition of the polyurethane curing agent can enable the asphalt mixture to simultaneously realize the advantages of high drying speed, good leveling property, hardness, adhesive force and thermal stability improvement, extinction effect, poor light reflection of the mixture, matte effect, and contribution to improvement of driving safety and road surface appearance after repair.
Preferably, the phase change material is a solid-solid phase change material, such as a solid-solid phase change material of polyether, polyester and epoxy polymer composition or polyol.
More preferably, the particle size of the phase change material should be < 10 nm.
Further, the high modulus asphalt concrete is prepared according to the following method:
t1, heating the aggregate to more than 180 ℃, preserving heat for 3-5 min, and adding the aggregate into mixing equipment for stirring;
t2, adding the phase change material into the mixing equipment, and mixing for 1-3 min;
t3, adding a mold extender into the mixing equipment, and mixing for 5-10 seconds;
t4, adding mineral powder into the mixing equipment, and mixing for 5-10 seconds;
t5, adding the matrix asphalt, the stabilizer and the curing agent into the mixing equipment, and mixing for 30 seconds at the temperature of over 160 ℃ to obtain the asphalt.
In the preparation process of the high-modulus asphalt concrete, attention needs to be paid to firstly heating the aggregate to more than 180 ℃, preserving heat for 3-5 min to fully remove moisture in the aggregate, then mixing the aggregate with the phase-change material to avoid the moisture brought by the aggregate from influencing the performance of the asphalt mixture, and secondly, adding the phase-change material into the heated and dried aggregate and fully stirring the mixture to enable the mixture to be fully mixed with the aggregate, enter micropores in the aggregate and be loaded in the aggregate; then, firstly adding a mold-increasing agent, so that the mold-increasing agent is melted and softened to wrap the surface of the stone in the process of dry mixing with hot aggregate; then adding mineral powder, hot asphalt and other assistants for stirring, wherein the asphalt film is directly in close contact with the softening film of the mold increasing agent on the surface of the aggregate during stirring, the asphalt and the softened mold increasing agent mutually permeate between the aggregate and the asphalt interface, the asphalt film is locally strengthened and strong interfacial force is formed, and the aggregate and the phase change material coated inside the mold increasing agent are prevented from moving between the interfaces under the action of external force, so that the aim of modifying the interface is fulfilled.
Further, when the high modulus asphalt concrete is used for new road pavement, the following steps can be continuously performed after the step T5:
t6, material conveying by a material conveying vehicle;
t7, spreading by a paver;
t8, performing primary pressing on a steel-wheel road roller, wherein the temperature of asphalt concrete in the primary pressing process is more than or equal to 160 ℃;
t9, re-pressing the vibratory roller;
t10, final pressing, wherein the temperature of the asphalt concrete in the final pressing process is more than or equal to 90 ℃.
The modification mechanism of the mold-increasing agent in the asphalt concrete is described in detail below with reference to the attached figure 6 of the present application:
first, interface modification: during the dry mixing process with hot aggregate, the mold-increasing agent is melted and becomes soft to cover the surface of the aggregate. Then adding hot asphalt to stir, wherein the asphalt film is directly contacted with the softening film of the mold increasing agent on the surface of the aggregate during stirring, and the asphalt and the softened mold increasing agent are mutually permeated between the interface of the aggregate and the asphalt, so that the asphalt film is locally strengthened, strong interfacial force is formed, the aggregate is prevented from moving between the interfaces under the action of external force, and the aim of modifying the interfaces is fulfilled.
Secondly, reinforcement: in the process of mixing and transporting asphalt concrete, the mold increasing agent which is partially dissolved or swelled in the asphalt can be fully fermented and fused with the asphalt within limited time to form a cementing effect, so that the asphalt modification effects of improving the softening point temperature, increasing the viscosity, reducing the heat sensitivity and the like are achieved; in addition, the micro-crystallization area formed by the polymer in the mold-increasing agent has equivalent stiffness, is partially drawn into a plastic fiber shape during construction, and is bridged and crosslinked in the aggregate framework to form fiber reinforcement.
Thirdly, the alloy lattice distortion strengthens the matrix: usually, the high molecular polymer is in a crystal state in a free state below the melting temperature, and the dispersed polymer crystals reinforce the matrix asphalt in the mixture to realize the function of strengthening the matrix by distorting alloy lattices.
Fourthly, absorbing light oil in asphalt: this application the die-filling agent belongs to macromolecular material, can absorb the light oil content in the pitch to increase the viscosity of pitch, improve bituminous mixture's high temperature stiffness modulus, be favorable to improving the ability of asphalt concrete high temperature deformation resistance.
Fifthly, the embedding and extruding function: this application the mold-increasing agent softens when the mixture is mixed, then these granules are at rolling in-process thermoforming, and the space in the aggregate skeleton has been filled to the single particle size fine aggregate that has high adhesion in other words, has increased the skeleton effect of bituminous mixture structure, has reduced the permeability on shaping road surface simultaneously. In addition, the addition of the phase change material can further fill the gap in the aggregate framework, improve the strength of the aggregate, absorb the heat in the aggregate and reduce the thermal deformation degree of the aggregate.
Furthermore, as shown in fig. 7, when the high modulus asphalt concrete is used for repairing road surface diseases, the application also provides a road surface repairing method, which comprises the following steps:
p1, recognizing and cleaning the asphalt pavement diseases to form pits or cracks to be repaired;
p2, heating the pit or the crack to be repaired;
p3, preparing asphalt concrete for repairing;
p4, spraying asphalt concrete for repairing into the pit or crack to be repaired;
and P5, performing rolling finishing on the repaired pavement.
Further, the pavement patching method comprises the following steps:
p1, firstly, identifying the asphalt pavement diseases, and then digging out the disease parts to form pits or cracks to be repaired;
p2, heating the pit or crack to be repaired, heating the inner surface of the pit or crack to be repaired to be above 120 ℃, and preserving heat for 1-3 min;
p3, preparing asphalt concrete for repairing according to the preparation method of the high modulus asphalt concrete;
p4, filling the asphalt concrete for repairing prepared in the step P3 into a high-pressure sprayer, and spraying the asphalt concrete for repairing into the pit slot or crack to be repaired by using the high-pressure sprayer;
and P5, performing rolling finishing on the repaired pavement.
Specifically, in the step P2, the inner surface of the pit or crack to be repaired may be heated to 120 ℃ or higher by induction heating, microwave heating, infrared heating, electric heating, and the like, and the temperature is maintained for 1 to 3 min.
Further, in the step P4, when the repair asphalt concrete is sprayed into the pit or crack to be repaired by using the high-pressure sprayer, the repair asphalt concrete should be uniformly sprayed at the wound site by adjusting the spraying angle.
Preferably, in the step P4, the speed of the repair asphalt concrete sprayed from the high-pressure sprayer should be not less than 100 m/s.
More preferably, during the process of implementing the step P4, a protective cover or the like may be provided on the pit or the crack to be repaired to prevent the asphalt concrete particles sprayed at a high speed from sputtering and injuring people.
In the pavement repairing method, the pit or the crack to be repaired is heated in the step P2, so that the original asphalt concrete at the wound can be preheated and softened, and the bonding capacity of the original asphalt concrete and the newly added asphalt concrete for repairing is improved; in addition, a basis can be provided for the subsequent step P4, so that the effect of the step P4 is enhanced.
Specifically, in the step P4, the asphalt concrete for repair is sprayed at a high speed to the wound through the high-pressure sprayer, so that on one hand, unstable particles and dust adhered to the wound can be removed by impacting and rubbing the wound with the asphalt concrete particles flowing at a high speed, so that the wound is more stable, and the adhesion force at the wound is stronger; on the other hand, certain compressive stress can be applied to the wound by the asphalt concrete particles flowing at high speed, so that impact hardening is realized on the wound, the strength of the wound surface is improved, and the fatigue life is prolonged; in the third aspect, under the combined action of the speed of the asphalt concrete particles and high-pressure air sprayed by the high-pressure sprayer, the filling capacity of the asphalt concrete particles can be improved, so that the asphalt concrete particles can better enter a narrow space, and the pavement repairing method can be simultaneously suitable for repairing the openings of the crater-shaped or crack-shaped pavement and has a wider application range; in the fourth aspect, under the impact of the asphalt concrete particles flowing at a high speed, pits distributed widely can be formed on the wound surface, and the bonding capability of the wound surface and the newly added asphalt concrete for repair is further improved. On the basis, the original asphalt concrete at the wound can be preheated and softened by the high-temperature preheating in the step P2, and the technical effect brought by the impact of asphalt concrete particles on the wound surface is further improved.
Example 1
A preparation method of an asphalt concrete mold-enlarging agent specifically comprises the following steps:
s1, respectively weighing various raw materials for preparing the die-increasing agent according to the parts by weight, and specifically comprises the following components: 400 parts of swelling agent, 45 parts of polyethylene, 38 parts of polypropylene, 16 parts of terephthalic acid dihexyl ester, 12 parts of unsaturated carboxylic acid or unsaturated carboxylic acid derivative, 1 part of stabilizer, 0.6 part of activating agent, 0.1 part of antioxidant and 1 part of coupling agent;
s2, swelling polyethylene, polypropylene and polyethylene terephthalate: adding the polyethylene, the polypropylene, the polyethylene terephthalate and the swelling agent into a swelling kettle, stirring at the speed of 500r/min, heating to 80 ℃, keeping the temperature, stirring at the speed of 500r/mi for 2 hours, continuing stirring at the speed of 500r/min, heating to 110 ℃, keeping the temperature, and stirring at the speed of 100r/min for 2 hours;
s3, adding unsaturated carboxylic acid or unsaturated carboxylic acid derivative, stabilizer, activator and antioxidant into the mixture system obtained in the step S2, preserving heat at 110 ℃ and stirring at the speed of 100r/min for 0.3 h;
s4, heating and evaporating at 70 ℃ to remove the swelling agent, and obtaining a swelling polymer system after evaporation treatment;
s5, introducing the swollen polymer system obtained in the step S4 into a double-screw extruder, controlling the width of a gap between screws in the double-screw extruder to be 0.8 times of the thickness of an extrudate, extruding the extrudate through the extruder, and then granulating to obtain the die-increasing agent granules shown in the attached figure 5.
Example 2
A preparation method of high modulus asphalt concrete comprises the following steps:
t1, heating 85 parts by weight of aggregate to over 180 ℃, preserving heat for 3min, and adding into mixing equipment for stirring;
t2, adding 4 parts by weight of phase change material into the mixing equipment, and mixing for 2 min;
t3, adding 0.4 weight part of a die-increasing agent into the mixing equipment, and mixing for 10 seconds, wherein the die-increasing agent is the die-increasing agent described in the embodiment 1;
t4, adding 8 parts by weight of mineral powder into the mixing equipment, and mixing for 5 seconds;
t5, adding 4 parts by weight of base asphalt, 1 part by weight of stabilizer and 3 parts by weight of curing agent into a mixing device, and mixing at the temperature of above 160 ℃ for 30 seconds.
Example 3
A method of repairing a roadway surface, the method comprising the steps of:
p1, recognizing the asphalt pavement diseases, and digging out the disease parts to form pits and cracks to be repaired;
p2, heating the pit and the crack to be repaired, heating the inner surface of the pit and the crack to be repaired to be more than 120 ℃, and preserving heat for 1 min;
p3, preparing asphalt concrete for repair according to the preparation method of asphalt concrete described in the above example 2;
p4, filling the asphalt concrete for repairing prepared in the step P3 into a high-pressure sprayer, and spraying the asphalt concrete for repairing into the pit and the crack to be repaired by using the high-pressure sprayer, wherein the spraying speed of the asphalt concrete for repairing from the high-pressure sprayer is not less than 100 m/s;
and P5, performing rolling finishing on the repaired pavement.
Test example 1
The mold increasing agent shown in the attached figure 5 of the application is added into asphalt concrete in different doping amounts to prepare test pieces shown in figure 8, 3 test pieces are prepared according to the doping amount of each mold increasing agent, the average value of the 3 test pieces is used as a final detection result, the performance of the obtained test pieces is detected, and the following table 1 is obtained: (wherein the asphalt concrete for test pieces comprises 90 parts by weight of aggregate, 5 parts by weight of mineral powder and 5 parts by weight of matrix asphalt.)
TABLE 1 comparison of the results of the performance tests of asphalt concretes with different amounts of mold-enlarging agent
Although the present invention is disclosed above, the present invention is not limited thereto. In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (10)
1. The asphalt concrete mold-enlarging agent is characterized by comprising the following raw materials in parts by weight:
2. the mold augmentation agent of claim 1, further comprising: 1-3 parts by weight of a coupling agent.
3. The mold-building agent according to claim 1, wherein the mold-building agent is prepared by the following method:
s1, weighing the raw materials for preparing the die-increasing agent according to the parts by weight;
s2, swelling polyethylene, polypropylene and polyethylene terephthalate;
s3, adding unsaturated carboxylic acid or unsaturated carboxylic acid derivative, stabilizer, activator and antioxidant into the mixture system obtained in the step S2;
s4, evaporating to remove the swelling agent, and obtaining a swelling polymer system after evaporation treatment;
s5, introducing the swollen polymer system obtained in the step S4 into an extruder, extruding the swollen polymer system by the extruder, and granulating to obtain the die-increasing agent particles.
4. The mold-extender of claim 3, wherein said step S2 includes: adding the polyethylene, the polypropylene, the polyethylene terephthalate and the swelling agent into a swelling kettle, stirring at the speed of 500-700 r/min, heating to 60-80 ℃, keeping the temperature, stirring at the speed of 500-700 r/min for 2-3 hours, stirring at the speed of 500-700 r/min, heating to 110-120 ℃, keeping the temperature, and stirring at the speed of 100-200 r/min for 2-3 hours.
5. The high-modulus asphalt concrete is characterized by comprising the following raw materials in parts by weight:
wherein the mold-increasing agent is the mold-increasing agent of any one of the claims 1 to 4.
6. The asphalt concrete according to claim 5, wherein the aggregate is stone having a cellular structure.
7. The asphalt concrete according to claim 5, wherein the asphalt concrete is prepared according to the following method:
t1, heating the aggregate to more than 180 ℃, preserving heat for 3-5 min, and adding the aggregate into mixing equipment for stirring;
t2, adding the phase change material into the mixing equipment, and mixing for 1-3 min;
t3, adding a mold extender into the mixing equipment, and mixing for 5-10 seconds;
t4, adding mineral powder into the mixing equipment, and mixing for 5-10 seconds;
t5, adding the matrix asphalt, the stabilizer and the curing agent into the mixing equipment, and mixing for 30 seconds at the temperature of over 160 ℃ to obtain the asphalt.
8. The asphalt concrete according to claim 5, wherein the process of repairing the pavement damage using the asphalt concrete comprises the steps of:
p1, recognizing and cleaning the asphalt pavement diseases to form pits or cracks to be repaired;
p2, heating the pit or the crack to be repaired;
p3, preparing asphalt concrete for repairing;
p4, spraying asphalt concrete for repairing into the pit or crack to be repaired;
and P5, performing rolling finishing on the repaired pavement.
9. The asphalt concrete according to claim 8, wherein in step P2, the inner surface of the pit or crack to be repaired is heated to 120 ℃ or higher and is kept warm for 1-3 min.
10. The asphalt concrete according to claim 8, wherein in the step P4, when the repair asphalt concrete is sprayed into the pit or crack to be repaired by using a high-pressure sprayer, the speed of spraying the repair asphalt concrete from the high-pressure sprayer is not less than 100 m/s.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114804726A (en) * | 2022-05-12 | 2022-07-29 | 徐州市公路工程总公司 | EME-14 high-modulus asphalt concrete and preparation method thereof |
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| KR101732718B1 (en) * | 2016-01-06 | 2017-05-24 | 황익현 | Agents for Asphalt mixture and thereof manufacturing method and Asphalt mixture using the Agents and thereof manufacturing method |
| CN110684362A (en) * | 2019-11-18 | 2020-01-14 | 山东建筑大学 | Bio-based asphalt modifier and preparation method thereof |
| CN112830712A (en) * | 2021-01-19 | 2021-05-25 | 山东交通学院 | Modified asphalt mixture and preparation method thereof |
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| CN103073219A (en) * | 2013-01-09 | 2013-05-01 | 辽宁省交通科学研究院 | High-modulus bituminous concrete additive |
| KR101732718B1 (en) * | 2016-01-06 | 2017-05-24 | 황익현 | Agents for Asphalt mixture and thereof manufacturing method and Asphalt mixture using the Agents and thereof manufacturing method |
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