CN113072326A - Anti-cracking flame-retardant semi-flexible asphalt pavement material applied to cold region tunnel and method for preparing semi-flexible pavement by using same - Google Patents

Anti-cracking flame-retardant semi-flexible asphalt pavement material applied to cold region tunnel and method for preparing semi-flexible pavement by using same Download PDF

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CN113072326A
CN113072326A CN202110456286.4A CN202110456286A CN113072326A CN 113072326 A CN113072326 A CN 113072326A CN 202110456286 A CN202110456286 A CN 202110456286A CN 113072326 A CN113072326 A CN 113072326A
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flame
retardant
asphalt
semi
flexible
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CN113072326B (en
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刘贤鹏
马立纲
刘玉君
刘涛
葛生深
谢君
宋茳铠
江琪
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Yanchong Expressway Management Center Of Hebei Province
Wuhan University of Technology WUT
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Yanchong Expressway Management Center Of Hebei Province
Wuhan University of Technology WUT
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    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B26/00—Compositions of mortars, concrete or artificial stone, containing only organic binders, e.g. polymer or resin concrete
    • C04B26/02—Macromolecular compounds
    • C04B26/26—Bituminous materials, e.g. tar, pitch
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
    • C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
    • C04B28/04—Portland cements
    • 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
    • C04B2111/0075—Uses not provided for elsewhere in C04B2111/00 for road construction
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/20—Resistance against chemical, physical or biological attack
    • C04B2111/28—Fire resistance, i.e. materials resistant to accidental fires or high temperatures
    • 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
    • C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
    • C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies
    • Y02W30/91—Use of waste materials as fillers for mortars or concrete

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  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Materials Engineering (AREA)
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  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Inorganic Chemistry (AREA)
  • Road Paving Structures (AREA)

Abstract

The invention discloses an anti-cracking flame-retardant semi-flexible asphalt pavement material applied to a tunnel in a cold region and a method for preparing a semi-flexible pavement. It comprises large-gap asphalt concrete and cement mortar; the large-gap asphalt concrete comprises aggregate, waste tire rubber particles, filler and flame-retardant modified asphalt, wherein the flame-retardant modified asphalt comprises a flame retardant and polymer modified asphalt, and the mixing amount of the flame retardant is 10-30 wt% of the polymer modified asphalt; the cement mortar comprises cement, fly ash, superfine sand, a high-efficiency water reducing agent, an expanding agent, anhydrous sodium sulfate and water. The flame-retardant anti-cracking semi-flexible pavement has the advantages of good flame-retardant property, capability of being applied to cold region tunnel pavements and the like, and can effectively reduce the cracking property of the pavement.

Description

Anti-cracking flame-retardant semi-flexible asphalt pavement material applied to cold region tunnel and method for preparing semi-flexible pavement by using same
Technical Field
The invention belongs to the technical field of building materials, and particularly relates to an anti-cracking flame-retardant semi-flexible asphalt pavement material applied to a tunnel in a cold region and a method for preparing a semi-flexible pavement.
Background
With the rapid development of highway traffic, asphalt pavement has become the main pavement form of highways and urban roads due to the characteristics of smooth surface, good noise reduction, short construction time, easy maintenance, good driving comfort and the like. However, asphalt is a high polymer material, is easy to age, has poor temperature stability and is inflammable, so that the use of the asphalt pavement undoubtedly increases the danger of the road in the case of fire and increases the duration of the fire; meanwhile, in some areas, the temperature is low in winter and spring, and the duration is long, so that the asphalt pavement can be cracked and damaged within 2-3 years.
The semi-flexible pavement is a rigid-flexible composite pavement material formed by pouring a grouting material with high fluidity and high strength into a large-gap asphalt mixture after rolling and forming. Because the asphalt of the traditional semi-flexible pavement is common modified asphalt, the temperature required to be heated is very high during construction, and the asphalt can release a large amount of heat during combustion and is accompanied with a large amount of toxic dense smoke; the cement-based grouting material has the advantages that the water evaporation is uneven due to temperature change at the early stage of cement hydration, and temperature shrinkage, self-shrinkage and the like are generated, so that the volume stability of the semi-flexible pavement material is reduced, and the internal bonding strength is reduced; with the increase of traffic volume, pavement cracks and pits are generated in 5-6 years, the pavement needs to be overhauled, and resources are seriously wasted.
Disclosure of Invention
The invention provides an anti-cracking flame-retardant semi-flexible asphalt pavement material applied to a tunnel in a cold region and a method for preparing a semi-flexible pavement by using the same. Due to the addition of the rubber particles, the volume stability of the whole semi-flexible pavement is improved, the toughness and elasticity of the asphalt concrete are enhanced, and the low-temperature cracking of the pavement is reduced. Meanwhile, due to the existence of surface cement paste, fire spreading can be prevented, the asphalt pavement is particularly suitable for cold region tunnel pavements, the problems that the existing tunnel asphalt surface layer is inflammable and surface cracks are easy to occur are solved, and the service life of the cold region tunnel pavements is prolonged.
In order to achieve the purpose, the invention adopts the technical scheme that:
an anti-cracking flame-retardant semi-flexible asphalt pavement material applied to a tunnel in a cold region comprises large-gap asphalt concrete and cement mortar; the large-gap asphalt concrete comprises aggregate, waste tire rubber particles, filler and flame-retardant modified asphalt, wherein the flame-retardant modified asphalt comprises a flame retardant and polymer modified asphalt, and the doping amount of the flame retardant is 10-30 wt% of the polymer modified asphalt; the cement mortar comprises cement, fly ash, superfine sand, a high-efficiency water reducing agent, an expanding agent, anhydrous sodium sulfate and water.
Preferably, the particle diameter of the waste tire rubber particles is 0.18 mm-0.6 mm, the black powder has the density of 0.65g/cm3。
Preferably, the large-gap asphalt concrete comprises the following components in percentage by weight: 30-38% of aggregate with the particle size of 9.5-16 mm, 40-50% of aggregate with the particle size of 4.75-9.5 mm, 2-5% of aggregate with the particle size of 2.36-4.75 mm, 5-8% of aggregate with the particle size of 0-2.36 mm, 3-5% of waste tire rubber particles and 1-4% of filler, wherein the sum of the components is 100%; the amount of the flame-retardant modified asphalt is 3.0-3.6 of oilstone ratio.
Preferably, the flame retardant is an inorganic composite hydroxide of aluminum hydroxide, magnesium hydroxide or a mixture of the two in any proportion.
Preferably, the cement mortar comprises the following components in parts by weight: 80-120 parts of cement, 30-50 parts of fly ash, 30-50 parts of extra fine sand, 5-15 parts of an expanding agent, 0.5-1.5 parts of anhydrous sodium sulfate, 5-10 parts of a high-efficiency water reducing agent, and the water-material ratio is 0.4-0.6.
Preferably, the cement in the cement mortar is ordinary portland cement, and P.O 42.5-52.5 can be selected.
Preferably, the fly ash is a secondary fly ash.
Preferably, the superfine sand is river sand II, and the fineness modulus is 1.5.
Preferably, the anhydrous sodium sulfate, Na2SO4The content is more than 99 percent. ,
preferably, the swelling agent is UEA swelling agent, off-white powder and natural bulk volume weight of 1 g/mL.
Preferably, the porosity of the large-void asphalt concrete is 22-30%.
Preferably, the purity of the flame retardant is more than or equal to 99.0%, the average particle size is 1.5-2 μm, and the flame retardant is white powder.
Preferably, the polymer modified asphalt is SBS (I-A, I-B, I-C, I-D) or high viscosity modified asphalt.
Preferably, the aggregate is basalt; the filler is one or a mixture of mineral powder and slaked lime, and the fineness modulus is 2.3.
Preferably, the high-efficiency water reducing agent is a polycarboxylate water reducing agent and light yellow powder, the solid content is not less than 95%, and the particle size is 15-45 μm.
The method for preparing the flame-retardant anti-cracking semi-flexible pavement from the semi-flexible asphalt pavement material comprises the following steps:
1) preparing flame-retardant modified asphalt: heating and melting polymer modified asphalt, stirring to dehydrate the asphalt, and then heating the asphalt and keeping the temperature to 140-150 ℃; adding a flame retardant into the polymer modified asphalt while stirring to obtain the flame-retardant modified asphalt;
2) forming the large-gap asphalt concrete: the method comprises the following steps of weighing aggregates with different particle sizes according to a proportion, heating the aggregates and waste tire rubber particles at the temperature of 170-190 ℃ for 2-4 hours, then uniformly mixing the aggregates and the waste tire rubber particles to obtain a mixture, sequentially adding flame-retardant modified asphalt with the temperature of 160-170 ℃ and a filler into the mixture, uniformly stirring the mixture, forming according to the requirements of asphalt mixture test piece manufacturing in road engineering asphalt and asphalt mixture test regulations, and obtaining macroporous asphalt concrete after forming;
3) preparing cement mortar: the cement, the fly ash, the extra fine sand and the expanding agent are mixed uniformly in a dry mixing way, and then the water, the anhydrous sodium sulfate and the high-efficiency water reducing agent are poured into the mixture after being uniformly stirred to prepare cement mortar;
4) and pouring the obtained cement mortar into macroporous asphalt concrete under a vibration condition, and curing to obtain the anti-cracking flame-retardant semi-flexible anti-cracking pavement.
Preferably, the curing conditions in the step 4) are that the temperature is 18-22 ℃, the relative humidity is more than 90%, and curing is carried out in a curing room for 3-7 days.
Compared with the prior art, the invention has the beneficial effects that:
1) the modified asphalt modified by adding the flame retardant into the asphalt has the advantages of reducing the penetration degree of the asphalt and improving the softening point of the asphalt to improve the high-temperature performance of the asphalt, and on the other hand, the flame-retardant modified asphalt is matched with high-quality aggregates to form large-gap asphalt concrete, wherein the inorganic hydroxide flame retardant realizes the flame-retardant effect by heat absorption decomposition, water vapor dilution and promotion of the formation of a stable carbon layer, and the flame-retardant effect of cement mortar is added, so that the whole pavement has the advantages of high temperature resistance and non-flammability.
2) Rubber particles are added into the asphalt mixture, and because the rubber particles are elastic materials, the deformation capacity of the materials is greatly increased under the same load; meanwhile, the expanding agent added into the cement mortar can restrain micro cracks generated by the cement mortar due to temperature shrinkage and self-shrinkage, so that the semi-flexible pavement has good low-temperature crack resistance.
Drawings
FIG. 1 is a composition grading curve of asphalt mixture.
FIG. 2 is a cross-sectional view of a flame-retardant anti-cracking semi-flexible pavement test piece.
FIG. 3 is a schematic view of a flame retardant property test.
Detailed Description
In order to better understand the present invention, the following examples are further provided to illustrate the content of the present invention, but the content of the present invention is not limited to the following examples.
In the following examples, the SBS I-C modified asphalt used has the performance specifications shown in Table 1.
In the following examples, the cement used was ordinary Portland 42.5#, and its performance index is shown in Table 2.
In the following examples, the swelling agent used was UEA swelling agent, off-white powder, natural bulk weight 1 g/mL.
TABLE 1 SBS I-C bitumen base Performance index
Test items Test results Technical requirements Test protocol
Penetration (25 ℃, 100g, 5s)/0.1mm 70 ≥60 T0604-2011
Softening point (Ring and ball method)/[ deg. ] C 65 ≥55 T0606-2011
Degree of extension(5cm/min、5℃)/cm 48 ≥30 T0605-2011
Brookfield rotational viscosity (135 ℃ C.)/pas 1.23 Measured in fact T0625-2011
Density (15 ℃ C.)/(g/cm)3) 1.039 Measured in fact T0603-2011
TABLE 2 basic performance indexes of Portland 42.5# cement
Figure BDA0003040633210000041
In the following examples, the flame retardant used was an inorganic composite hydroxide flame retardant comprising, as main components, 75% by weight of magnesium hydroxide and 25% by weight of aluminum hydroxide, having a purity of 99.5% and an average particle diameter of 1.8. mu.m.
In the following embodiment, the high-efficiency water reducing agent is a polycarboxylate water reducing agent, and is light yellow powder, the solid content is more than or equal to 95%, and the particle size is 15-45 μm.
Example 1
The flame-retardant modified asphalt is prepared by adding a flame retardant into SBS I-C modified asphalt and modifying, and the preparation method comprises the following steps:
1) weighing 300 parts of modified asphalt SBS (I-C) and 75 parts of flame retardant according to the mass parts.
2) Melting SBS modified asphalt: heating the polymer modified asphalt to 100 ℃ to reach a molten state, stirring for 20min to dehydrate the asphalt, and then heating and maintaining the temperature at 150 ℃;
3) and adding the flame retardant into the obtained SBS modified asphalt, stirring while adding, and stirring for about 30min, wherein the temperature of the SBS modified asphalt is controlled at 150 ℃ in the adding and stirring processes, and finally obtaining the flame-retardant modified asphalt.
Example 2
The flame-retardant modified asphalt is prepared by adding a flame retardant into high-viscosity modified asphalt and modifying, and the preparation method comprises the following steps:
1) weighing 300 parts of high-viscosity modified asphalt and 75 parts of flame retardant according to parts by weight.
2) Melting high-viscosity modified asphalt: heating the polymer modified asphalt to 100 ℃ to reach a molten state, stirring for 20min to dehydrate the asphalt, and then heating and maintaining the temperature at 150 ℃;
3) and adding the flame retardant into the obtained high-viscosity modified asphalt, stirring while adding, and stirring for about 30min, wherein the temperature of the high-viscosity modified asphalt is controlled at 150 ℃ in the adding and stirring processes, and finally obtaining the flame-retardant modified asphalt.
The high-viscosity modified asphalt is prepared by directly adding a direct vat type high-viscosity modifier HVA into matrix asphalt (70#, 90#) or SBS modified asphalt (I-A, I-B, I-C, I-D) at 170 ℃, and shearing for half an hour under the high-speed shearing of 2000-3000 r/mindui. This example was prepared by blending SBS modified asphalt I-C. The HVA of the high viscosity asphalt modifier of this example and other examples was obtained from Zebra Kogyo technologies, Inc. of Beijing.
Example 3
The flame-retardant anti-cracking semi-flexible pavement material is composed of large-gap asphalt concrete and cement mortar filled into gaps of the large-gap asphalt concrete, the gap filling rate is more than 90%, and the method for preparing the flame-retardant anti-cracking semi-flexible pavement material by utilizing the large-gap asphalt concrete material comprises the following steps:
1) weighing raw materials; the mass percentage of each solid aggregate in the large-gap asphalt concrete is as follows: 38% of basalt aggregate with the particle size of 9.5-16 mm, 50% of basalt aggregate with the particle size of 4.75-9.5 mm, 2% of basalt aggregate with the particle size of 2.36-4.75 mm, 5% of basalt aggregate with the particle size of 0-2.36 mm, 4% of waste tire rubber particles, 1% of limestone mineral powder filler and 3.3% of oilstone ratio of flame-retardant SBS modified asphalt; in the cement mortar, 100 parts of cement, 40 parts of fly ash, 30 parts of extra fine sand, 10 parts of an expanding agent, 0.5 part of anhydrous sodium sulfate, 8 parts of a high-efficiency water reducing agent and the water-material ratio of 0.5 are adopted.
The waste tire rubber used in this example had an average particle diameter of 0.3mm, black powder and a density of 0.65g/cm3。
The adopted aggregate is basalt; according to the requirements of highway asphalt pavement design Specification (JTG D50-2006), OGFC-13 continuous dense-graded asphalt mixture is selected to carry out grading synthesis on aggregate, waste tire rubber particles and filler, the synthetic grading is shown in the following table 3, and fig. 1 is a synthetic grading curve.
TABLE 3 basalt OGFC-13 synthetic grading
Figure BDA0003040633210000051
2) Heating the SBS I-C modified asphalt to 100 ℃ to reach a molten state, stirring for 20min to dehydrate the SBS I-C modified asphalt, and then heating and maintaining the temperature at 150 ℃; and adding 25 wt% of flame retardant into SBS modified asphalt by adopting an external doping method, stirring while adding, stirring for about 30min, and controlling the temperature of the modified asphalt at 150 ℃ in the adding and stirring processes to finally obtain the flame-retardant modified asphalt.
3) Weighing the weighed aggregate and the waste tire rubber particles, putting the weighed aggregate and the waste tire rubber particles into a tray, uniformly stirring, then putting the tray into a heating device for heating, keeping the temperature at 180 ℃ and drying for 3 hours, and then adding the mineral powder filler and the flame-retardant modified asphalt for stirring; the method comprises the specific steps of putting dried aggregates and waste tire rubber particles into a mixing pot with the temperature of 175 ℃ reached in advance, mixing for 90s, adding heated modified asphalt after the aggregates and the waste tire rubber particles are uniformly mixed, mixing for 90s, adding weighed filler, mixing for 90s, and respectively molding the prepared large-gap asphalt concrete to prepare a 300mm multiplied by 3000mm multiplied by 50mm rut plate and a standard Marshall test piece, wherein the void ratio is 23%.
4) Dry-mixing the weighed cement, fly ash, extra-fine sand and expanding agent for 180s, then uniformly stirring water, anhydrous sodium sulfate and a high-efficiency water reducing agent, and pouring the mixture into the mixture for wet mixing for 90s to obtain cement mortar;
5) pouring the obtained cement mortar into macroporous asphalt concrete in a vibration mode, and curing and preserving for 7 days in a curing room with the temperature of 20 ℃ and the relative humidity of more than 90 percent to obtain the flame-retardant anti-cracking semi-flexible pavement; the calculated void fill for the large void asphalt concrete was 96.6%.
Example 4
The method for preparing the flame-retardant anti-cracking semi-flexible pavement material comprises the following steps:
1) weighing raw materials; the mass percentage of each solid aggregate in the large-gap asphalt concrete is as follows: 38% of basalt aggregate with the particle size of 9.5-16 mm, 50% of basalt aggregate with the particle size of 4.75-9.5 mm, 2% of basalt aggregate with the particle size of 2.36-4.75 mm, 5% of basalt aggregate with the particle size of 0-2.36 mm, 4% of waste tire rubber particles, 1% of limestone mineral powder filler and 3.0% of oilstone ratio of the flame-retardant high-viscosity modified asphalt; in the cement mortar, 100 parts of cement, 40 parts of fly ash, 30 parts of extra fine sand, 10 parts of an expanding agent, 0.5 part of anhydrous sodium sulfate, 8 parts of a high-efficiency water reducing agent and the water-material ratio of 0.5 are adopted. Aggregate and filler grading requirements were the same as in example 3.
The waste tire rubber used in this example had an average particle diameter of 0.3mm, black powder and a density of 0.65g/cm3。
2) Heating the high-viscosity modified asphalt to 100 ℃ to reach a molten state, stirring for 20min to dehydrate the high-viscosity modified asphalt, and then heating and maintaining the high-viscosity modified asphalt at 150 ℃; and adding 25 wt% of flame retardant into the high-viscosity modified asphalt, stirring while adding, and stirring for about 30min, wherein the temperature of the modified asphalt is controlled at 150 ℃ in the adding and stirring processes, and finally obtaining the flame-retardant modified asphalt.
3) Weighing the weighed aggregate and the waste tire rubber particles, putting the weighed aggregate and the waste tire rubber particles into a tray, uniformly stirring, then putting the tray into a heating device for heating, keeping the temperature at 180 ℃ and drying for 3 hours, and then adding the mineral powder filler and the flame-retardant modified asphalt for stirring; the method comprises the following steps of putting dried aggregates and waste tire rubber particles into a mixing pot with the temperature of 175 ℃ reached in advance, mixing for 90s, adding heated modified asphalt after the aggregates and the waste tire rubber particles are uniformly mixed, mixing for 90s, adding weighed filler, mixing for 90s, and respectively molding the prepared large-gap asphalt concrete to prepare a 300mm multiplied by 3000mm multiplied by 50mm rut plate and a standard Marshall test piece with the porosity of 23%;
3) dry-mixing the weighed cement, fly ash, extra-fine sand and expanding agent for 180s, uniformly stirring water, anhydrous sodium sulfate and a high-efficiency water reducing agent, and pouring the mixture into the mixture for wet mixing for 90s to obtain cement mortar;
4) pouring the obtained cement mortar into macroporous asphalt concrete in a vibration mode, and curing and preserving for 7 days in a curing room with the temperature of 20 ℃ and the relative humidity of more than 90 percent to obtain the semi-flexible pavement with the flame-retardant and crack-resistant performances; the calculated void fill for the large void asphalt concrete was 97.8%.
Example 5
This example is substantially the same as example 1, except that in the raw material weighing step:
1) the mass percentage of each solid aggregate in the large-gap asphalt concrete is as follows: 30% of basalt aggregate with the grain size of 9.5-16 mm, 40% of basalt aggregate with the grain size of 4.75-9.5 mm, 5% of basalt aggregate with the grain size of 2.36-4.75 mm, 8% of basalt aggregate with the grain size of 0-2.36 mm, 3% of waste tire rubber particles, 4% of limestone mineral powder filler and 3.6% of oilstone ratio of flame-retardant SBS modified asphalt; in the cement mortar, 120 parts of cement, 50 parts of fly ash, 30 parts of extra fine sand, 5 parts of an expanding agent, 1.5 parts of anhydrous sodium sulfate, 10 parts of a high-efficiency water reducing agent, and the water-material ratio is 0.6.
Example 6
This example is the same as example 3 except that the average particle diameter of the rubber particles of the waste tires used was 0.4 mm.
Example 7
This example is the same as example 3 except that the average particle diameter of the rubber particles of the waste tires used was 0.5 mm.
Example 8
This example is the same as example 3 except that the average particle diameter of the rubber particles of the waste tires used was 0.6 mm.
Comparative example 1
The biggest difference between the comparative example and the example 3 is that the modified asphalt is only SBS modified asphalt and no flame retardant is added. The method comprises the following specific steps:
the preparation method of the semi-flexible asphalt concrete comprises the following steps:
1) weighing raw materials; the mass percentage of each solid aggregate in the large-gap asphalt concrete is as follows: 38% of basalt aggregate with the grain size of 9.5-16 mm, 50% of basalt aggregate with the grain size of 4.75-9.5 mm, 2% of basalt aggregate with the grain size of 2.36-4.75 mm, 5% of basalt aggregate with the grain size of 0-2.36 mm, 4% of waste tire rubber particles, 1% of limestone mineral powder filler and the SBS modified asphalt adopting the oil-stone ratio of 3.5; in the cement mortar, 100 parts of cement, 40 parts of fly ash, 30 parts of extra fine sand, 10 parts of an expanding agent, 0.5 part of anhydrous sodium sulfate, 8 parts of a high-efficiency water reducing agent and the water-material ratio of 0.5 are adopted. Aggregate and filler grading requirements were the same as in example 3.
2) Weighing the aggregate in the step 1), putting the aggregate into a tray, uniformly stirring, then putting the tray into a heating device for heating at 180 ℃, preserving heat for 4 hours, and putting the mineral powder filler and the modified asphalt into the heating device for heating;
3) putting the dried aggregate into a mixing pot which is advanced to reach 175 ℃ for mixing for 90s, adding the heated modified asphalt into the coarse and fine aggregate for mixing uniformly for mixing for 90s, adding the weighed filler, mixing for 90s in the same way, and putting the prepared asphalt mixture into a mold of 300mm multiplied by 3000mm multiplied by 50mm to form a rutting plate; the porosity thereof is 23%;
4) dry-mixing the weighed cement, fly ash, extra-fine sand and expanding agent for 180s, uniformly stirring water, anhydrous sodium sulfate and a high-efficiency water reducing agent, and pouring the mixture into the mixture for wet mixing for 90s to obtain cement mortar;
5) pouring cement mortar into the macroporous asphalt concrete rut plate in a vibration mode, and curing for 7 days in a cement curing chamber to finally form the traditional semi-flexible asphalt concrete; the calculated void fill for the large void asphalt concrete was 94.6%.
Comparative example 2
The comparative example differs from example 4 most greatly in that no scrap tire rubber particles are added to the large void asphalt concrete.
The method comprises the following specific steps:
the preparation method of the semi-flexible asphalt concrete comprises the following steps:
1)1) weighing raw materials; the mass percentage of each solid aggregate in the large-gap asphalt concrete is as follows: 38% of basalt aggregate with the grain size of 9.5-16 mm, 50% of basalt aggregate with the grain size of 4.75-9.5 mm, 2% of basalt aggregate with the grain size of 2.36-4.75 mm, 9% of basalt aggregate with the grain size of 0-2.36 mm, 1% of limestone mineral powder filler and 3.0% of oilstone ratio of flame-retardant SBS modified asphalt; in the cement mortar, 100 parts of cement, 40 parts of fly ash, 30 parts of extra fine sand, 10 parts of an expanding agent, 0.5 part of anhydrous sodium sulfate, 8 parts of a high-efficiency water reducing agent and the water-material ratio of 0.5 are adopted. Aggregate and filler grading requirements were the same as in example 1;
2) heating the SBS pitch to 100 ℃ to reach a molten state, stirring for 20min to dehydrate the SBS pitch, and then heating and maintaining the temperature at 150 ℃; and adding 25 wt% of flame retardant into SBS modified asphalt, stirring while adding, stirring for about 30min, and controlling the temperature of the modified asphalt at 150 ℃ in the adding and stirring processes to obtain the flame-retardant modified asphalt.
3) Weighing the weighed aggregate, putting the weighed aggregate into a tray, uniformly stirring, then putting the tray into a heating device for heating, keeping the temperature at 180 ℃ and drying for 4 hours, and then adding mineral powder filler and flame-retardant modified asphalt for mixing; the method comprises the following steps of putting dried aggregates into a mixing pot with the temperature reaching 175 ℃ in advance for mixing, wherein the mixing time is 90s, adding heated modified asphalt after the coarse and fine aggregates are uniformly mixed, mixing for 90s, adding weighed filler, mixing for 90s in the same way, and respectively molding the prepared large-gap asphalt concrete to prepare a rutting plate with the size of 300mm multiplied by 3000mm multiplied by 50mm and a standard Marshall test piece with the void ratio of 23%;
4) dry-mixing the weighed cement, fly ash, extra-fine sand and expanding agent for 180s, uniformly stirring water, anhydrous sodium sulfate and a high-efficiency water reducing agent, and pouring the mixture into the mixture for wet mixing for 90s to obtain cement mortar;
5) pouring the obtained cement mortar into macroporous asphalt concrete in a vibration mode, and curing and preserving for 7 days in a curing room with the temperature of 20 ℃ and the relative humidity of more than 90 percent to obtain the semi-flexible pavement with the flame-retardant and crack-resistant performances; the calculated void fill for the large void asphalt concrete was 95.8%.
Comparative example 3
This comparative example is substantially the same as example 3 except that the average particle diameter of the rubber particles of the waste tires used is 0.2 mm.
Comparative example 4
This comparative example is substantially the same as example 3 except that the average particle diameter of the rubber particles of the waste tires used is 0.7 mm.
The performances of the examples 1-2 of the invention are compared with those of common polymer modified asphalt, and the specific results are shown in Table 4; the semi-flexible asphalt pavement materials obtained in examples 3-5 and comparative examples 1-2 are respectively subjected to pavement performance tests, the specific results are shown in table 5, and the flame retardant performance test schematic diagram and the test results are shown in tables 3 and 6.
FIG. 2 is a cross-sectional view of the flame-retardant, crack-resistant, semi-flexible pavement structure obtained in example 1; the figure shows that the rubber particles in the semi-flexible anti-cracking pavement are uniformly distributed, and the low-temperature anti-cracking performance of the pavement is favorably improved.
Table 4 comparison of performances of examples 1 to 2 with conventional polymer-modified asphalt
Index (I) Example 1 Example 2 Ordinary polymer modified asphalt Specification requirements
Penetration 25 deg.C (0.1mm) 63 56 70 ≥60
Softening Point (. degree. C.) 78 93 65 ≥55
Yandu 5 deg.C (cm) 31 24 48 ≥30
Oxygen index (%) 32 35 25 ≥23
Density of smoke 57 59 78 ≤75
Fire point/. degree.C 275 286 245 /
Flash point/. degree.C 269 275 237 ≥230
Smoke toxicity rating Quasi-safety class one Quasi-safety class one Quasi-safety three-level /
TABLE 5 results of tests on road Performance of semi-flexible asphalt road materials obtained in examples 3 to 5 and comparative examples
Figure BDA0003040633210000091
Figure BDA0003040633210000101
Table 6 results of testing flame retardancy of semi-flexible asphalt pavement materials obtained in examples 3-4 and comparative examples
Index (I) Example 3 Example 4 Comparative example 1
Temperature at which the asphalt mixture starts to burn/. degree.C 315 320 295
Highest temperature/DEG C of asphalt mixture when burning 343 337 384
Time/s required for surface combustion to end 58 74 25
The above results show that: compared with common polymer modified asphalt, the flash point and the fire point of the flame-retardant modified asphalt prepared by the invention are both improved by 20-30 ℃; under the flame of 1300 ℃, the temperature of the flame-retardant modified asphalt mixture is 20-35 ℃ higher than that of the common polymer modified asphalt mixture when the flame-retardant modified asphalt mixture starts to burn, the temperature of the flame-retardant modified asphalt mixture when the flame-retardant modified asphalt mixture burns is 30-40 ℃ lower than that of the common polymer modified asphalt mixture, and the time required by the asphalt mixture from the beginning to the completion of the combustion is 30-50 seconds; the semi-flexible pavement material has the advantages that the asphalt mixture is wrapped by the cement paste, so that the time of fire disaster is greatly prolonged, and the road rescue time is prolonged.
Compared with the comparative example, the residual stability, the freeze-thaw splitting strength ratio, the dynamic stability and the like of the Marshall test piece and the rut plate test piece are improved to a certain extent, and the road performance can be effectively improved; meanwhile, the asphalt mixture contains rubber particles, the rubber is an elastic material, the rigidity of the asphalt mixture is reduced, and simultaneously, the toughness and the impermeability of cement mortar doped with the expanding agent are improved compared with those of common cement mortar, and the deformation resistance of a road surface is greatly improved under the same load, so that the asphalt mixture has higher bending tensile strength, maximum bending tensile stress and smaller bending tensile stiffness modulus under the severe cold condition. The smaller the bending stiffness modulus is, the smaller the rigidity of the material is, the problem of pavement cracking caused by self-contraction and temperature contraction of the pavement can be effectively reduced, and the life cycle of the whole road is prolonged.
Meanwhile, the applicant compared the average particle size of the rubber particles of the waste tires, and the specific results are shown in table 7. As can be seen from examples 3, 6-8 and comparative examples 3 and 4, under the condition of keeping other conditions unchanged, the particle size of the waste tire rubber particles can affect the void ratio of the asphalt mixture and the filling ratio of the cement mortar, the particle size is too small, the void ratio of the asphalt concrete is too small, the filling ratio of the cement mortar is also small, and even the requirement is not met (as in comparative example 3), the pavement performance of the whole semi-flexible pavement can be reduced; the particle size is too big, and the clearance of asphalt concrete can grow, means that matrix asphalt mixture's bonding property reduces, and the filling rate of cement mortar becomes high simultaneously, and the cement low temperature is from the shrinkage deformation degree grow, and the combined action of both makes the low temperature fracture probability grow of semi-flexible road surface. Therefore, selection of an appropriate particle size is critical to road performance.
TABLE 7 results of tests for pavement properties of semi-flexible asphalt pavement materials obtained in examples 3, 6, 7 and 8 and comparative examples 3 and 4
Index (I) Example 3 Example 6 Example 7 Example 8 Comparative example 3 Comparative example 4
Void ratio (%) 23 24 25 25 20 27
Cement mortar filling Rate (%) 96.6 96.8 97.1 97.2 88.9 98.2
Dynamic stability after grouting (time/mm) 23960 23120 22780 21590 17682 18250
Freeze-thaw split strength ratio (%) 96.5 96.4 96.0 95.8 92.5 90％
Residual stability (%) 95.4 93.5 92.7 91.2 89.5 88％
Coefficient of linear shrinkage at low temperature (10)-6/℃) 6.5 7.0 7.2 7.4 6.6 11.2
Fatigue life/time at 0.4 stress ratio 20165 19587 19020 18646 14652 17985
Flexural tensile Strength at-10 ℃ (MPa) 10.67 10.48 10.37 10.28 9.26 8.95
Maximum bending strain at-10 ℃ (mu epsilon) 1662 1604 1584 1575 1026 1354
Flexural tensile modulus (MPa) at-10 ℃ 6552 6606 6628 6673 9956 6640
The above-mentioned embodiments only express the specific embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention.

Claims (10)

1. An anti-cracking flame-retardant semi-flexible asphalt pavement material applied to a tunnel in a cold region is characterized by comprising large-gap asphalt concrete and cement mortar; the large-gap asphalt concrete comprises aggregate, waste tire rubber particles, filler and flame-retardant modified asphalt, wherein the flame-retardant modified asphalt comprises a flame retardant and polymer modified asphalt, and the mixing amount of the flame retardant is 10-30 wt% of the polymer modified asphalt; the cement mortar comprises cement, fly ash, superfine sand, a high-efficiency water reducing agent, an expanding agent, anhydrous sodium sulfate and water.
2. The crack-resistant flame-retardant semi-flexible asphalt pavement material according to claim 1, wherein the particle size of the waste tire rubber particles is 0.18 mm-0.6 mm.
3. The crack-resistant flame-retardant semi-flexible asphalt pavement material according to claim 1, wherein the large-void asphalt concrete comprises the following components in percentage by weight: 30-38% of aggregate with the particle size of 9.5-16 mm, 40-50% of aggregate with the particle size of 4.75-9.5 mm, 2-5% of aggregate with the particle size of 2.36-4.75 mm, 5-8% of aggregate with the particle size of 0-2.36 mm, 3-5% of waste tire rubber particles and 1-4% of filler, wherein the sum of the components is 100%; the amount of the flame-retardant modified asphalt is 3.0-3.6 of oilstone ratio.
4. The crack-resistant flame-retardant semi-flexible asphalt pavement material according to claim 1, wherein the flame retardant is an inorganic composite hydroxide of aluminum hydroxide, magnesium hydroxide or a mixture of the aluminum hydroxide and the magnesium hydroxide in any proportion.
5. The anti-cracking flame-retardant semi-flexible asphalt pavement material according to claim 1, wherein the cement mortar comprises the following components in parts by weight: 80-120 parts of cement, 30-50 parts of fly ash, 30-50 parts of extra fine sand, 5-15 parts of an expanding agent, 0.5-1.5 parts of anhydrous sodium sulfate, 5-10 parts of a high-efficiency water reducing agent, and the water-material ratio is 0.4-0.6.
6. The crack-resistant flame-retardant semi-flexible asphalt pavement material according to claim 1, wherein the expanding agent is a UEA expanding agent.
7. The crack-resistant flame-retardant semi-flexible asphalt pavement material according to claim 1, wherein the large-void asphalt concrete has a void ratio of 22-30%.
8. The anti-cracking flame-retardant semi-flexible asphalt pavement material according to claim 1, wherein the purity of the flame retardant is more than or equal to 99.0%, and the average particle size is 1.5-2 μm.
9. The method for preparing the flame-retardant anti-cracking semi-flexible pavement by using the semi-flexible asphalt pavement material as claimed in claim 1, which is characterized by comprising the following steps:
1) preparing flame-retardant modified asphalt: heating and melting polymer modified asphalt, stirring to dehydrate the asphalt, and then heating the asphalt and keeping the temperature to 140-150 ℃; adding a flame retardant into the polymer modified asphalt while stirring to obtain the flame-retardant modified asphalt;
2) forming the large-gap asphalt concrete: the method comprises the following steps of weighing aggregates with different particle sizes and waste tire rubber particles according to a certain proportion, heating for 2-4 hours at the temperature of 170-190 ℃, then uniformly mixing the aggregates and the waste tire rubber particles to obtain a mixture, sequentially adding 160-170 ℃ flame-retardant modified asphalt and a filler into the mixture, uniformly stirring, and forming to obtain macroporous asphalt concrete;
3) preparing cement mortar: the cement, the fly ash, the extra fine sand and the expanding agent are mixed uniformly in a dry mixing way, and then the water, the anhydrous sodium sulfate and the high-efficiency water reducing agent are poured into the mixture after being uniformly stirred to prepare cement mortar;
4) and pouring the obtained cement mortar into macroporous asphalt concrete under a vibration condition, and curing to obtain the anti-cracking flame-retardant semi-flexible anti-cracking pavement.
10. The method as claimed in claim 9, wherein the curing conditions in the step 4) are 18-22 ℃ and the relative humidity is more than 90%, and the curing is carried out in a curing chamber for 3-7 days.
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101693611A (en) * 2009-09-30 2010-04-14 长安大学 Semi-flexible pavement injection grout
CN101700970A (en) * 2009-11-17 2010-05-05 武汉理工大学 Rubber-cement grouting material applied to semi-flexible pavement
CN101857401A (en) * 2010-05-13 2010-10-13 广东龙湖科技有限公司 Self-inflow type semi-flexible composite pavement and construction method thereof
CN104863032A (en) * 2015-05-12 2015-08-26 上海市政工程设计研究总院（集团）有限公司 Durable tunnel paving structure
CN206245161U (en) * 2016-10-25 2017-06-13 长安大学 One kind is applied to the fire-retardant SBS pitches composite pavement structure in tunnel
JP2019019544A (en) * 2017-07-14 2019-02-07 大成ロテック株式会社 Pavement and pavement construction method

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101693611A (en) * 2009-09-30 2010-04-14 长安大学 Semi-flexible pavement injection grout
CN101700970A (en) * 2009-11-17 2010-05-05 武汉理工大学 Rubber-cement grouting material applied to semi-flexible pavement
CN101857401A (en) * 2010-05-13 2010-10-13 广东龙湖科技有限公司 Self-inflow type semi-flexible composite pavement and construction method thereof
CN104863032A (en) * 2015-05-12 2015-08-26 上海市政工程设计研究总院（集团）有限公司 Durable tunnel paving structure
CN206245161U (en) * 2016-10-25 2017-06-13 长安大学 One kind is applied to the fire-retardant SBS pitches composite pavement structure in tunnel
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