CN115215585A - Resin asphalt mixture for ultra-long tunnel and preparation method thereof - Google Patents
Resin asphalt mixture for ultra-long tunnel and preparation method thereof Download PDFInfo
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- CN115215585A CN115215585A CN202210834264.1A CN202210834264A CN115215585A CN 115215585 A CN115215585 A CN 115215585A CN 202210834264 A CN202210834264 A CN 202210834264A CN 115215585 A CN115215585 A CN 115215585A
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B26/00—Compositions of mortars, concrete or artificial stone, containing only organic binders, e.g. polymer or resin concrete
- C04B26/02—Macromolecular compounds
- C04B26/26—Bituminous materials, e.g. tar, pitch
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/00724—Uses not provided for elsewhere in C04B2111/00 in mining operations, e.g. for backfilling; in making tunnels or galleries
Abstract
The invention relates to the technical field of materials for bridge and tunnel pavement, in particular to a resin asphalt mixture for an ultra-long tunnel and a preparation method thereof, wherein the resin asphalt mixture comprises the following components: the asphalt comprises graded mineral aggregate and resin biological asphalt, wherein the resin biological asphalt is at least prepared from a component A, a component B and a component C; wherein, the component A comprises: bisphenol A type epoxy resin and alkyl-terminated normal-temperature cured hyperbranched flame-retardant polyester; the component B comprises an amino-terminated polyaryletherketone curing agent, an organosilicon monomer and an accelerator; the resin asphalt mixture prepared by the invention has the advantages of high strength, good flexibility, long service life, good durability and the like, compared with the warm mix flame-retardant asphalt mixture for the tunnel, the fatigue life of the resin asphalt mixture is improved by more than 5 times, the production temperature is greatly reduced to the normal temperature of 15-25 ℃ from the original 150-155 ℃, the smoke hazard under the tunnel sealing construction environment is effectively solved, the service life of the tunnel pavement is prolonged, and the maintenance frequency of the ultra-long tunnel is reduced.
Description
Technical Field
The invention relates to the technical field of materials for bridge and tunnel pavement, in particular to a resin asphalt mixture for an ultra-long tunnel and a preparation method thereof.
Background
At present, under the background of the 'double-carbon' era in China, a tunnel is used as a semi-closed space, adverse conditions such as narrow space, low illumination, poor air circulation and the like exist in the internal construction of the tunnel, a 'low-carbon' or even 'zero-carbon' paving material is more needed for paving a large-volume ultra-long tunnel pavement, and the national 'double-carbon' target is practiced under the condition of improving the construction operation environment. On the other hand, the tunnel is used as a river-crossing channel of a common expressway, the traffic flow is large, the canalized traffic is remarkable, the construction space in the tunnel is narrow, the maintenance operation difficulty in the future is large, and the performance of the paving material needs to meet the requirement of long service life. The paving material adopting the conventional asphalt mixture has good driving comfort, high and low temperature performance and the like, but the fatigue durability of the paving material is hard to play the role of the long-life tunnel pavement paving material. Therefore, it is necessary to provide a resin asphalt mixture for an ultra-long tunnel and a preparation method thereof.
The information disclosed in this background section is only for enhancement of understanding of the general background of the disclosure and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art that is known to a person skilled in the art.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the resin asphalt mixture for the ultra-long tunnel and the preparation method thereof are provided, so that the smoke harm under the closed construction environment of the tunnel is effectively solved, and the service life of the tunnel pavement is prolonged.
In order to achieve the purpose, the invention adopts the following technical scheme to realize the purpose:
a resin asphalt mixture for an ultra-long tunnel comprises: the asphalt comprises a graded mineral aggregate and resin biological asphalt, wherein the resin biological asphalt is at least prepared from a component A, a component B and a component C; wherein, the component A comprises: bisphenol A epoxy resin and alkyl-terminated normal-temperature curing hyperbranched flame-retardant polyester; the component B comprises an amino-terminated polyaryletherketone curing agent, an organosilicon monomer and an accelerator; the component C comprises biological heavy oil and liquid asphalt.
It is emphasized that the alkyl-terminated normal temperature curing hyperbranched flame-retardant polyester adopted by the component A is a polymer with benzene rings, can form a stable conjugated system with unsaturated bonds in a bisphenol A epoxy resin structure, is beneficial to maintaining the stability of the compound, and meanwhile, the resin system containing the phosphorus hyperbranched polyester is introduced to endow the component A with better carbon forming capability, good flame-retardant performance and smoke emission inhibition. The component A is a first crosslinking reaction stage of the whole resin asphalt curing system, the hyperbranched flame-retardant polyester after the alkyl capping has low flow point and small viscosity change, an oxidation-reduction normal-temperature curing system at 15-25 ℃ is formed by chemically crosslinking the bisphenol A type epoxy resin by the long flexible chain segment of the hyperbranched flame-retardant polyester terminated by the alkyl capping, the special performances which are not possessed by a plurality of linear polymers such as low initiation activation energy, low initiation temperature, convenient use and the like are realized, the activation energy is small and easy to decompose to generate free radicals, so that the reaction which can be carried out at the original high temperature can be carried out at the lower temperature, and meanwhile, the hyperbranched flame-retardant polyester and the bisphenol A have physical interlocking, the occurrence of molecular phase separation is avoided, and the inherent brittleness of the epoxy resin is improved while the viscosity of the component A material is not changed.
Further, the component A comprises 100 parts by weight of bisphenol A epoxy resin and 5-10 parts by weight of alkyl-terminated normal-temperature cured hyperbranched flame-retardant polyester; the component B comprises: 50-100 parts of amino-terminated polyaryletherketone curing agent, 1-20 parts of organosilicon monomer and 0.5-1.5 parts of accelerator; the component C comprises: 20-30 parts of biological heavy oil and 70-80 parts of liquid asphalt.
Further, the bisphenol a type epoxy resin is a mixture of epoxy resins having an average epoxy value of 0.44, 0.51 and 0.55.
Based on the above knowledge, the invention mixes the normal temperature high viscosity liquid epoxy resin with the average epoxy value of 0.44, the normal temperature low viscosity liquid epoxy resin with the average epoxy value of 0.51 and the normal temperature low viscosity liquid epoxy resin with the average epoxy value of 0.55, and the bisphenol A type epoxy resin obtained by compounding the epoxy resins with different epoxy values has the 'fusion viscosity' of 12000-17000 mPas, and reduces the viscosity by 40% -57% compared with the single common epoxy resin, thereby having better construction operability. In addition, the sufficient fluidity can fill the gaps of the initial network of the cured material, so that the cured material forms better domain size, and the toughness of the cured material is greatly improved.
Further, the graded mineral aggregate comprises the following substances in percentage by weight: 57-61% of basalt aggregate with the grain diameter of 5-10 mm, 13-17% of basalt aggregate with the grain diameter of 3-5 mm, 16-20% of basalt aggregate with the grain diameter of 0-3 mm and the balance of mineral powder.
Further, the mass ratio of the resin biological asphalt to the graded mineral aggregate is 6.5-9.0: 100.
further, the alkyl-terminated normal-temperature-curing hyperbranched flame-retardant polyester is a polymer synthesized by taking aliphatic hyperbranched flame-retardant polyester, N-dimethylformamide, stearic acid, thionyl chloride, ethylenediamine, triethylamine, acetone and dichloromethane as raw materials.
The aliphatic hyperbranched flame-retardant polyester is a flame-retardant polymer containing phosphorus on the main chain, can react with a carbon source at high temperature to form a protective carbon layer when meeting open fire, isolates a fire source, prevents the polymer from degrading, avoids smoke emission, and has the characteristics of low viscosity, good physical properties, good flame-retardant performance and the like. At the initial stage of the curing reaction, because the viscosity of the system is low, molecules are easy to diffuse and contact with epoxy resin molecules, free radical copolymerization reaction is carried out between epoxy resin monomers and aliphatic hyperbranched flame-retardant polyester at normal temperature, the epoxy resin monomers and the aliphatic hyperbranched flame-retardant polyester enter a gel stage, when the curing reaction is carried out to a certain stage, the generation, growth and branching of chains in the system are then crosslinked, the viscosity of the system is increased, the molecular motion is hindered, and the molecular diffusion and hardening stage is carried out; the ethylene diamine is an amine chain extender, the average relative molecular mass of the aliphatic hyperbranched flame-retardant polyester is improved as much as possible by introducing and synthesizing the amine chain extender, and the flexibility of the aliphatic hyperbranched flame-retardant polyester chain segment is increased along with the increase of the relative molecular mass of the flexible chain segment; the triethylamine is an amine neutralizer, the viscosity of the aliphatic hyperbranched flame-retardant polyester is neutralized by introducing and synthesizing the neutralizer, the appearance and the stability are improved, and the alkyl-terminated normal-temperature curing hyperbranched flame-retardant polyester prepared by adopting the components is more beneficial to improving the performance of bisphenol A epoxy resin and improving the flame retardant performance of the whole resin curing system.
Further, the amino-terminated polyaryletherketone curing agent is any one or a mixture of two of amino-terminated polybisphenol A ether benzophenone and amino-terminated polymethylhydroquinone ether benzophenone.
The amino-terminated polyaryletherketone is a flexible macromolecular curing agent, a polyaryletherketone macromolecular chain simultaneously contains benzene rings, ether bonds and ketone bonds, and the existence of the ether bonds in a main chain structure can improve the flexibility and the flexibility of chain segments between crosslinking points of a cured product, so that the cured product has high toughness, the ketone bonds have carbonyl groups for improving intermolecular force, and the ether bonds and the ketone bonds are synthesized in different introduction modes, so that the fatigue resistance toughness of the cured product is greatly improved. The tail end of the molecular chain segment of the aromatic ether ketone is terminated by amino, the aromatic ether ketone is connected to a benzene ring to activate the benzene ring, an N atom in the amino has a pair of lone pair electrons to ensure that the amino has stronger nucleophilic attack capability, and the rigid benzene ring containing the amino ring ensures that a condensate has excellent high-temperature performance and fatigue performance.
Further, the organic silicon monomer is any one or a mixture of several of methyl chlorosilane, methyl phenyl dichlorosilane, vinyl trichlorosilane, methyl vinyl dichlorosilane, ethyl trichlorosilane and propyl trichlorosilane.
It is noted that the silicon-oxygen bond (-Si-O-) in the main chain of the introduced organosilicon monomer is stable, has no double bonds, is not easy to break and decompose under the ultraviolet illumination in the natural environment, and can effectively improve the weathering resistance of the cured product. Through the skeleton connection between two or more than two inorganic silicon oxygen bonds and organic branched chains, the component B structure has the characteristics of organic groups and inorganic structures, the bond energy is greatly improved, the chemical bond is firmer, the molecular structure of a cured product is more stable, the chemical property and the excellent temperature resistance property of the cured product are realized, the change along with the temperature is smaller, and the service life of the road material is effectively prolonged.
Further, the accelerant is imidazole derivative 2- (2-hydroxyphenyl) -1H-benzimidazole.
It is noted that at normal temperature, in a shear stress field in the material preparation process, intramolecular hydrogen bonds of the accelerator are broken, catalytic activity is released, and a blend of the component A and the component B is promoted to form a curing crosslinking network, namely, a two-phase continuous structure is formed on a microscopic form in a second crosslinking reaction stage of the whole resin asphalt curing system, and the two-phase systems are mutually penetrated to realize performance complementation between the components. At low temperature, the accelerator has intramolecular hydrogen bonds to block the activity of the curing agent, so that the component B has good room-temperature storage stability.
Furthermore, the biological heavy oil is heavy biological oil with higher molecular weight and more stable performance prepared by methods such as distillation, extraction, chemical condensation polymerization and the like.
The biological heavy oil as a biomass material has higher oxygen element content and lower carbon element content than the asphalt material, and the biological heavy oil is mixed into the petroleum asphalt by a blending method, and the biological carbon micro-particles contained in the biological heavy oil ensure that the biological asphalt has better high-temperature stability than the petroleum asphalt. For tunnel pavement, the temperature environment is relatively mild.
Further, the liquid asphalt is any one of 50# liquid asphalt, 70# liquid asphalt and 90# liquid asphalt, and the specific selection needs to be determined according to the climate characteristics of the area where the road section is located, wherein the high-temperature performance is 50# liquid asphalt > 70# liquid asphalt > 90# liquid asphalt, and the low-temperature performance is 50# liquid asphalt < 70# liquid asphalt < 90# liquid asphalt.
The preparation method of the resin asphalt mixture for the ultra-long tunnel comprises the following steps:
s1: sequentially putting bisphenol A type epoxy resin and alkyl-terminated normal-temperature cured hyperbranched flame-retardant polyester into a reaction kettle, and mixing and stirring at the normal temperature of 30-40 min at the stirring speed of 80-100 r/min to obtain a component A;
s2: sequentially putting an amino-terminated polyaryletherketone curing agent, an organic silicon monomer and an accelerant into a reaction kettle, and mixing and stirring at the normal temperature of 30-40 min at the stirring speed of 80-100 r/min to obtain a component B;
s3: stirring the component A and the component B at normal temperature for 3-5 min at the stirring speed of 80-100 r/min to prepare a mixture A;
s4: shearing the biological heavy oil and the liquid asphalt at a high speed of 1000rpm at normal temperature for not less than 30min to prepare a component C;
s5: and (3) mixing and stirring the graded mineral aggregate and the mixture A at normal temperature at the stirring speed of 40-50 r/min, continuously stirring after uniformly stirring, and uniformly spraying the component C on the surface to obtain the resin asphalt mixture.
It should be noted that, in the present invention, the component C is added into the resin asphalt mixture by a spraying method, and when spraying, compressed air is not mixed in the pressurized high-pressure component C, and the component C is pressurized only by driving the high-pressure pump with the compressed air, but the compressed air does not directly contact with the component C. When the high-pressure component C leaves the nozzle and reaches the atmosphere, the high-pressure component C is immediately and violently expanded and atomized into extremely fine particles to the surface of the mixture B, so that the material scattering is reduced and the material consumption is saved compared with the conventional method.
Further, the biological heavy oil is kept for not less than 1h in an oven at the temperature of 160-165 ℃, and then is kept stand at normal temperature for removing water and low-boiling-point micromolecular substances generated by decomposition.
The invention has the beneficial effects that: the resin asphalt mixture prepared by the invention has the advantages of high strength, good flexibility, long service life, good durability and the like, and compared with a warm-mixed flame-retardant asphalt mixture for a tunnel, the fatigue life of the resin asphalt mixture is improved by more than 5 times, the production temperature is greatly reduced from the original 150-155 ℃ to the normal temperature of 15-25 ℃, the smoke harm under the closed construction environment of the tunnel is effectively solved, the service life of the tunnel pavement is prolonged, and the maintenance frequency of an ultra-long tunnel is reduced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments described in the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a graph comparing a bending tensile modulus-fatigue loading times curve of a four-point bending fatigue test of warm-mix flame-retardant asphalt mixtures of examples 1, 2 and 3 of the invention and a curve of a warm-mix flame-retardant asphalt mixture under test parameters of 800 micro strain (mu epsilon), 15 ℃ and 10 Hz.
FIG. 2 is a graph comparing the total smoke yield curves of the resin bio-asphalt of examples 1, 2 and 3 of the present invention and the SBS modified asphalt (flame retardant asphalt) added with the flame retardant in the comparative example within (0-5) min, and the smoke density grade of the material within (0-5) min is obtained by dividing the area enclosed by the curve and the coordinate axis below the curve by the total area of the graph and multiplying by 100.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
The raw material sources used in the examples of the present invention are:
bisphenol a type epoxy resin: DRE-732, dow chemical USA
Alkyl sealEnd normal temperature curing hyperbranched flame-retardant polyester: H102-C 18 Jiangsu Zhongyi passway New Material Co Ltd
Amino-terminated polyaryletherketone curing agent:
RM-B, middleway science and technology GmbH
Organosilicon monomer: XIAAMETER-OFS-6030, dow Corning, USA
Accelerator (b): SBEC, sulin New materials science and technology GmbH
Biological heavy oil: jiangsu Zhongyi passway New Material Co., ltd
Liquid asphalt: 70# liquid asphalt, jiangsu Zhongyi passway New Material Co., ltd
SBS modified asphalt:
PG76-22, warm mix of Jiangsu Zhongyi passway New materials Co., ltd.:
MW-I, zhonglu science and technology Co., ltd
Flame retardant:
flame retardant, zhonglu science and technology Co., ltd
Example 1:
the resin asphalt mixture for the ultra-long tunnel comprises graded mineral aggregate and resin biological asphalt, and is measured by mass:
wherein, the proportion of the graded mineral aggregate 4020 is as follows: basalt aggregate with the grain size of 5-10 mm: basalt aggregate with the grain size of 3-5 mm: basalt aggregate with the grain size of 0-3 mm: mineral powder =59:15:18:8 dry mixing to obtain;
the resin biological asphalt comprises a component A, a component B and a component C, wherein the component A comprises 100 parts of bisphenol A epoxy resin and 6 parts of alkyl-terminated normal-temperature curing hyperbranched flame-retardant polyester; the component B comprises: 50 parts of amino-terminated polyaryletherketone curing agent, 5 parts of organic silicon monomer and 0.5 part of accelerator; the component C comprises: 20 parts of biological heavy oil and 80 parts of No. 70 liquid asphalt.
The preparation method of the resin asphalt mixture for the ultra-long tunnel provided by the embodiment specifically comprises the following steps of:
(1) Preparation of component A
According to the mass, 100 parts of bisphenol A epoxy resin and 6 parts of alkyl terminated normal temperature curing hyperbranched flame-retardant polyester are sequentially put into a reaction kettle to be mixed and stirred for 30min at normal temperature, and the stirring speed is 80r/min, so that a component A is prepared;
(2) Preparation of component B
Sequentially putting 50 parts of amino-terminated polyaryletherketone curing agent, 5 parts of organic silicon monomer and 0.5 part of accelerator into a reaction kettle by mass, and mixing and stirring at normal temperature for 30min at the stirring speed of 80r/min to prepare a component B;
(3) Preparation of component C
Keeping the biological heavy oil in an oven at 160-165 ℃ for not less than 1h, and standing at normal temperature for later use; according to the mass, 20 parts of biological heavy oil and 80 parts of liquid asphalt are sheared at a high speed of 1000rpm for 40min at normal temperature to prepare a component C;
(4) Preparation of a graded mineral aggregate
Basalt aggregate with the grain diameter of 5-10 mm according to the mass ratio: basalt aggregate with the grain size of 3-5 mm: basalt aggregate with the grain size of 0-3 mm: mineral powder =59:15:18:8, dry mixing to obtain 4020 parts of graded mineral aggregate;
(5) Preparation of resin asphalt mixture
Stirring the prepared component A and the component B for 3min at normal temperature at the stirring speed of 80r/min to prepare a mixture A; and (3) mixing and stirring the prepared mixture A and the graded mineral aggregate at normal temperature for 1min at the stirring speed of 40r/min, uniformly stirring to obtain a mixture B, continuously stirring, and uniformly coating the component C on the inner surface and the outer surface of the prepared mixture B by adopting a spraying method to obtain a resin asphalt mixture.
Example 2:
the resin asphalt mixture for the ultra-long tunnel comprises graded mineral aggregate and resin biological asphalt, and is measured by mass:
wherein, the graded mineral aggregate 3612 parts by mass ratio: basalt aggregate with the grain size of 5-10 mm: basalt aggregate with the grain size of 3-5 mm: basalt aggregate with the grain size of 0-3 mm: mineral powder =59:15:18:8 dry mixing to obtain;
the resin biological asphalt comprises a component A, a component B and a component C, wherein the component A comprises 100 parts of bisphenol A epoxy resin and 8 parts of alkyl-terminated normal-temperature curing hyperbranched flame-retardant polyester; the component B comprises: 70 parts of amino-terminated polyaryletherketone curing agent, 10 parts of organosilicon monomer and 1.0 part of accelerator; the component C comprises: 20 parts of biological heavy oil and 80 parts of No. 70 liquid asphalt.
The preparation method of the resin asphalt mixture for the ultra-long tunnel comprises the following steps:
(1) Preparation of component A
Sequentially putting 100 parts of bisphenol A type epoxy resin and 8 parts of alkyl-terminated normal-temperature cured hyperbranched flame-retardant polyester into a reaction kettle by mass for normal-temperature mixing and stirring for 30min at the stirring speed of 80r/min to prepare a component A;
(2) Preparation of component B
According to the mass, 70 parts of amino-terminated polyaryletherketone curing agent, 10 parts of organic silicon monomer and 1.0 part of accelerator are sequentially put into a reaction kettle to be mixed and stirred at normal temperature for 30min, and the stirring speed is 80r/min, so that a component B is prepared;
(3) Preparation of component C
Keeping the biological heavy oil in an oven at 160-165 ℃ for not less than 1h, and standing at normal temperature for later use; according to the mass, 20 parts of biological heavy oil and 80 parts of liquid asphalt are subjected to high-speed shearing at a shearing rate of 1000rpm for 40min at normal temperature to prepare a component C;
(4) Preparation of graded mineral aggregates
Basalt aggregate with the grain diameter of 5-10 mm according to the mass ratio: basalt aggregate with the grain size of 3-5 mm: basalt aggregate with the grain size of 0-3 mm: mineral powder =59:15:18:8, dry-mixing to obtain 3612 parts of graded mineral aggregate;
(5) Preparation of resin asphalt mixture
Stirring the prepared component A and the component B for 3min at normal temperature at the stirring speed of 80r/min to prepare a mixture A; and (3) mixing and stirring the prepared mixture A and the graded mineral aggregate at normal temperature for 1min at the stirring speed of 40r/min, uniformly stirring to obtain a mixture B, continuously stirring, and uniformly coating the component C on the inner surface and the outer surface of the prepared mixture B by adopting a spraying method to obtain a resin asphalt mixture.
Example 3:
the resin asphalt mixture, the graded mineral aggregate and the resin biological asphalt for the ultra-long tunnel according to the embodiment are as follows by mass:
wherein the weight ratio of the graded mineral aggregate is 3737: basalt aggregate with the grain size of 5-10 mm: basalt aggregate with the grain size of 3-5 mm: basalt aggregate with the grain size of 0-3 mm: mineral powder =59:15:18:8 dry mixing to obtain;
the resin biological asphalt comprises a component A, a component B and a component C, wherein the component A comprises 100 parts of bisphenol A epoxy resin and 8 parts of alkyl-terminated normal-temperature curing hyperbranched flame-retardant polyester; the component B comprises: 70 parts of amino-terminated polyaryletherketone curing agent, 10 parts of organosilicon monomer and 1.0 part of accelerator; the component C comprises: 30 parts of biological heavy oil and 80 parts of No. 70 liquid asphalt.
The preparation method of the resin asphalt mixture for the ultra-long tunnel comprises the following steps:
(1) Preparation of component A
Sequentially putting 100 parts of bisphenol A type epoxy resin and 8 parts of alkyl-terminated normal-temperature cured hyperbranched flame-retardant polyester into a reaction kettle by mass for normal-temperature mixing and stirring for 30min at the stirring speed of 80r/min to prepare a component A;
(2) Preparation of component B
According to the mass, 70 parts of amino-terminated polyaryletherketone curing agent, 10 parts of organic silicon monomer and 1.0 part of accelerator are sequentially added into a reaction kettle to be mixed and stirred at normal temperature for 30min, and the stirring speed is 80r/min, so that a component B is prepared;
(3) Preparation of component C
Keeping the biological heavy oil in an oven at 160-165 ℃ for not less than 1h, and standing at normal temperature for later use; according to the mass, 30 parts of biological heavy oil and 80 parts of liquid asphalt are sheared at a high speed of 1000rpm for 40min at normal temperature to prepare a component C;
(4) Preparation of graded mineral aggregates
Basalt aggregate with the grain diameter of 5-10 mm according to the mass ratio: basalt aggregate with the grain size of 3-5 mm: basalt aggregate with the grain size of 0-3 mm: mineral powder =59:15:18:8, dry mixing to obtain 3737 parts of graded mineral aggregate;
(5) Preparation of resin asphalt mixture
Stirring the prepared component A and the component B for 3min at normal temperature at the stirring speed of 80r/min to prepare a mixture A; and (3) mixing and stirring the prepared mixture A and the graded mineral aggregate at normal temperature for 1min at the stirring speed of 40r/min, uniformly stirring to obtain a mixture B, continuously stirring, and uniformly coating the component C on the inner surface and the outer surface of the prepared mixture B by adopting a spraying method to obtain a resin asphalt mixture.
Comparative example 1:
the warm mix flame-retardant asphalt mixture disclosed in the embodiment comprises: by mass, 100 parts of graded mineral aggregate, 6 parts of SBS modified asphalt, 3 parts of warm mixing agent and 1.5 parts of flame retardant.
(1) Preparation of a graded mineral aggregate
According to the mass ratio (0-3.5 mm): (3.5-7 mm): (7-11 mm): (11-18 mm): mineral powder =14:6:33:37:10, dry mixing for 20s to obtain 100 parts of graded mineral aggregate;
(2) Preparation of warm-mixed flame-retardant asphalt mixture
The warm-mix agent, the flame retardant, the SBS modified asphalt at the constant temperature of 170 ℃ and the graded mineral aggregate are mixed for 60s in a wet mode, and the mixing temperature is 155 ℃, so that the warm-mix flame-retardant asphalt mixture is obtained.
Table 1 shows the test properties of each example and comparative example
As can be seen from the comparison of various performance indexes of the resin asphalt mixture and the warm-mixed flame-retardant asphalt mixture on the upper surface, the performance of the resin asphalt mixture completely meets the technical requirement of tunnel pavement. Compared with the embodiment 1, under the same conditions of the component C and the mixing process, the dosage of the alkyl-terminated normal-temperature-cured hyperbranched flame-retardant polyester is increased in the component A, the dosage of the amino-terminated polyaryletherketone curing agent, the organosilicon monomer and the accelerator are increased in the component B, the low-temperature bending strain is improved by 6%, the bending fatigue is improved from 97 ten thousand times to more than 100 ten thousand times, and the fatigue toughness is obviously improved; compared with the embodiment 2, the embodiment 3 has the advantages that under the conditions of the same resin biological asphalt mixing amount, the same components of the component A and the component B and the same mixing process, the using amount of the component C is increased, the asphalt coating amount is increased, the bending fatigue performance is not obviously influenced and still reaches more than 100 million times, and the low-temperature bending tensile strain is further increased by 9%; in general, the low-temperature deformability of the resin asphalt mixture is about 25% higher than that of the warm-mixed flame-retardant asphalt mixture, and the fatigue life under large strain is about 3 times of that of the warm-mixed flame-retardant asphalt mixture.
Table 2 shows the resin bio-bitumen in each example and the flame retarded bitumen smoke density grade in the comparative example
| Detecting items | Unit | Example 1 | Example 2 | Example 3 | Flame-retardant asphalt | Technical requirements |
| Smoke density rating SDR | ％ | 21.8 | 16.3 | 20.7 | 71.3 | ≤75 |
As can be seen from the comparison of the smoke density grades of the above resin bio-asphalt and the flame-retardant asphalt, the resin bio-asphalt completely meets the technical requirements. Compared with the embodiment 1, under the condition of the same component C, the component A is added with the dosage of the alkyl-terminated normal-temperature-cured hyperbranched flame-retardant polyester, and the component B is added with the dosage of the amino-terminated polyaryletherketone curing agent, the organosilicon monomer and the accelerator, so that the smoke density grade of the resin biological asphalt is reduced, and the resin biological asphalt is safer and more environment-friendly; example 3 the smoke density grade is relatively higher with an increased amount of C-component compared to example 2 for the same a-component and B-component ingredients, and the smoke density grade of the pitch is increased with an increased amount of pitch. Generally, compared with the flame-retardant asphalt, the smoke density grade of the resin biological asphalt is reduced by about 69 percent, and the resin biological asphalt is a good low-smoke tunnel road surface material.
It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (10)
1. A resin asphalt mixture for an ultra-long tunnel is characterized by comprising: the asphalt comprises a graded mineral aggregate and resin biological asphalt, wherein the resin biological asphalt is at least prepared from a component A, a component B and a component C; wherein, the component A comprises: bisphenol A epoxy resin and alkyl-terminated normal-temperature curing hyperbranched flame-retardant polyester; the component B comprises an amino-terminated polyaryletherketone curing agent, an organosilicon monomer and an accelerator; the component C comprises biological heavy oil and liquid asphalt.
2. The resin asphalt mixture for the ultra-long tunnel according to claim 1, wherein the component A comprises 100 parts by weight of bisphenol A epoxy resin and 5-10 parts by weight of alkyl terminated normal temperature curing hyperbranched flame-retardant polyester; the component B comprises: 50-100 parts of amino-terminated polyaryletherketone curing agent, 1-20 parts of organosilicon monomer and 0.5-1.5 parts of accelerator; the component C comprises: 20-30 parts of biological heavy oil and 70-80 parts of liquid asphalt.
3. The resin asphalt mixture for an ultra-long tunnel according to claim 2, wherein said bisphenol a type epoxy resin is a mixture of epoxy resins having average epoxy values of 0.44, 0.51 and 0.55.
4. The resin asphalt mixture for the ultra-long tunnel according to any one of claims 1 to 3, wherein the graded mineral aggregate is composed of the following substances by weight percent: 57-61% of basalt aggregate with the grain diameter of 5-10 mm, 13-17% of basalt aggregate with the grain diameter of 3-5 mm, 16-20% of basalt aggregate with the grain diameter of 0-3 mm and the balance of mineral powder.
5. The resin asphalt mixture for the ultra-long tunnel according to any one of claims 1 to 3, wherein the amino-terminated polyaryletherketone curing agent is any one or a mixture of two of amino-terminated poly bisphenol A ether benzophenone and amino-terminated poly hydroquinone ether benzophenone.
6. The resin asphalt mixture for the ultra-long tunnel according to any one of claims 1 to 3, wherein the organosilicon monomer is any one or a mixture of methyl chlorosilane, methyl phenyl dichlorosilane, vinyl trichlorosilane, methyl vinyl dichlorosilane, ethyl trichlorosilane and propyl trichlorosilane.
7. The resin asphalt mixture for an ultra-long tunnel according to any one of claims 1 to 3, wherein the accelerator is imidazole derivative 2- (2-hydroxyphenyl) -1H-benzimidazole.
8. The resin asphalt mixture for an ultra-long tunnel according to any one of claims 1 to 3, wherein the liquid asphalt is any one of 50# liquid asphalt, 70# liquid asphalt and 90# liquid asphalt.
9. The preparation method of the resin asphalt mixture for the ultra-long tunnel is characterized by being used for preparing the resin asphalt mixture for the ultra-long tunnel according to any one of claims 1 to 8, and comprising the following steps of:
s1: sequentially putting bisphenol A type epoxy resin and alkyl-terminated normal-temperature cured hyperbranched flame-retardant polyester into a reaction kettle, and mixing and stirring at normal temperature for 30-40 min at the stirring speed of 80-100 r/min to obtain a component A;
s2: sequentially putting an amino-terminated polyaryletherketone curing agent, an organic silicon monomer and an accelerant into a reaction kettle, and mixing and stirring at the normal temperature of 30-40 min at the stirring speed of 80-100 r/min to obtain a component B;
s3: stirring the component A and the component B at normal temperature for 3-5 min at the stirring speed of 80-100 r/min to prepare a mixture A;
s4: shearing the biological heavy oil and the liquid asphalt at a high speed of 1000rpm for not less than 30min at normal temperature to prepare a component C;
s5: and (3) mixing and stirring the graded mineral aggregate and the mixture A at normal temperature at the stirring speed of 40-50 r/min, continuously stirring after uniformly stirring, and uniformly spraying the component C on the surface to obtain the resin asphalt mixture.
10. The method for preparing the resin asphalt mixture for the ultra-long tunnel according to claim 9, wherein the biological heavy oil is kept still at normal temperature after being kept warm for not less than 1 hour in an oven at 160-165 ℃.
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| CN102585528A (en) * | 2012-02-23 | 2012-07-18 | 南京大学 | High-performance epoxy bitumen mixture easy to construct and maintain and preparation method thereof |
| CN104987735A (en) * | 2015-07-06 | 2015-10-21 | 交通运输部公路科学研究所 | Organosilicone modification epoxy asphalt and mixture |
| CN112724698A (en) * | 2021-01-18 | 2021-04-30 | 湖南腾达岩土工程技术有限公司 | High-temperature secondary curing epoxy modified asphalt pavement paving material and preparation and use method thereof |
| CN115159897A (en) * | 2022-06-09 | 2022-10-11 | 长安大学 | Warm-mix high-brightness paving layer material used in tunnel and preparation method thereof |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102585528A (en) * | 2012-02-23 | 2012-07-18 | 南京大学 | High-performance epoxy bitumen mixture easy to construct and maintain and preparation method thereof |
| CN104987735A (en) * | 2015-07-06 | 2015-10-21 | 交通运输部公路科学研究所 | Organosilicone modification epoxy asphalt and mixture |
| CN112724698A (en) * | 2021-01-18 | 2021-04-30 | 湖南腾达岩土工程技术有限公司 | High-temperature secondary curing epoxy modified asphalt pavement paving material and preparation and use method thereof |
| CN115159897A (en) * | 2022-06-09 | 2022-10-11 | 长安大学 | Warm-mix high-brightness paving layer material used in tunnel and preparation method thereof |
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