CN112125577A - Multi-scale nano material composite modified asphalt mixture and preparation method thereof - Google Patents
Multi-scale nano material composite modified asphalt mixture and preparation method thereof Download PDFInfo
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- 239000010426 asphalt Substances 0.000 title claims abstract description 115
- 239000000203 mixture Substances 0.000 title claims abstract description 49
- 239000002131 composite material Substances 0.000 title claims abstract description 30
- 238000002360 preparation method Methods 0.000 title claims abstract description 22
- 239000002086 nanomaterial Substances 0.000 title claims description 32
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 15
- 239000002994 raw material Substances 0.000 claims abstract description 14
- 239000002114 nanocomposite Substances 0.000 claims abstract description 13
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 77
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims description 76
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 claims description 72
- 239000007822 coupling agent Substances 0.000 claims description 62
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 60
- 239000003607 modifier Substances 0.000 claims description 50
- 229910000019 calcium carbonate Inorganic materials 0.000 claims description 38
- 235000012239 silicon dioxide Nutrition 0.000 claims description 37
- 239000011787 zinc oxide Substances 0.000 claims description 36
- SOQBVABWOPYFQZ-UHFFFAOYSA-N oxygen(2-);titanium(4+) Chemical compound [O-2].[O-2].[Ti+4] SOQBVABWOPYFQZ-UHFFFAOYSA-N 0.000 claims description 33
- 239000005543 nano-size silicon particle Substances 0.000 claims description 32
- 238000003756 stirring Methods 0.000 claims description 29
- 229920003048 styrene butadiene rubber Polymers 0.000 claims description 20
- 238000001035 drying Methods 0.000 claims description 18
- 238000002156 mixing Methods 0.000 claims description 18
- 238000010438 heat treatment Methods 0.000 claims description 14
- 238000010008 shearing Methods 0.000 claims description 14
- 229910052500 inorganic mineral Inorganic materials 0.000 claims description 13
- 239000011707 mineral Substances 0.000 claims description 13
- 239000003381 stabilizer Substances 0.000 claims description 13
- 239000002174 Styrene-butadiene Substances 0.000 claims description 12
- 238000007865 diluting Methods 0.000 claims description 12
- 239000010455 vermiculite Substances 0.000 claims description 11
- 229910052902 vermiculite Inorganic materials 0.000 claims description 11
- 235000019354 vermiculite Nutrition 0.000 claims description 11
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims description 10
- 239000003795 chemical substances by application Substances 0.000 claims description 10
- 239000007800 oxidant agent Substances 0.000 claims description 10
- 150000004645 aluminates Chemical class 0.000 claims description 8
- 229920005549 butyl rubber Polymers 0.000 claims description 8
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 claims description 6
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 6
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims description 6
- 238000001816 cooling Methods 0.000 claims description 6
- 239000012153 distilled water Substances 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 6
- 230000001590 oxidative effect Effects 0.000 claims description 6
- 239000000377 silicon dioxide Substances 0.000 claims description 6
- 238000005406 washing Methods 0.000 claims description 6
- 239000000706 filtrate Substances 0.000 claims description 5
- 239000004408 titanium dioxide Substances 0.000 claims description 5
- 238000002844 melting Methods 0.000 claims description 4
- 230000008018 melting Effects 0.000 claims description 4
- CPELXLSAUQHCOX-UHFFFAOYSA-M Bromide Chemical compound [Br-] CPELXLSAUQHCOX-UHFFFAOYSA-M 0.000 claims description 3
- LZZYPRNAOMGNLH-UHFFFAOYSA-M Cetrimonium bromide Chemical compound [Br-].CCCCCCCCCCCCCCCC[N+](C)(C)C LZZYPRNAOMGNLH-UHFFFAOYSA-M 0.000 claims description 3
- 239000000835 fiber Substances 0.000 claims description 3
- 239000003208 petroleum Substances 0.000 claims description 3
- 239000011780 sodium chloride Substances 0.000 claims description 3
- 239000003245 coal Substances 0.000 claims description 2
- 238000007873 sieving Methods 0.000 claims description 2
- 230000006378 damage Effects 0.000 abstract description 6
- 230000004048 modification Effects 0.000 abstract description 6
- 238000012986 modification Methods 0.000 abstract description 6
- 239000000463 material Substances 0.000 abstract description 4
- 239000002105 nanoparticle Substances 0.000 abstract description 3
- 230000007547 defect Effects 0.000 abstract description 2
- 238000001179 sorption measurement Methods 0.000 abstract description 2
- 235000019441 ethanol Nutrition 0.000 description 14
- 238000012360 testing method Methods 0.000 description 9
- 238000010276 construction Methods 0.000 description 4
- 239000003085 diluting agent Substances 0.000 description 4
- 238000011161 development Methods 0.000 description 3
- 230000018109 developmental process Effects 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 239000004568 cement Substances 0.000 description 2
- 230000018044 dehydration Effects 0.000 description 2
- 238000006297 dehydration reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 238000000967 suction filtration Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 239000011300 coal pitch Substances 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 239000008367 deionised water Substances 0.000 description 1
- 229910021641 deionized water Inorganic materials 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 201000010099 disease Diseases 0.000 description 1
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 239000012065 filter cake Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 238000003303 reheating Methods 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
Classifications
-
- 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
- C04B22/00—Use of inorganic materials as active ingredients for mortars, concrete or artificial stone, e.g. accelerators, shrinkage compensating agents
- C04B22/06—Oxides, Hydroxides
-
- 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
- C04B22/00—Use of inorganic materials as active ingredients for mortars, concrete or artificial stone, e.g. accelerators, shrinkage compensating agents
- C04B22/08—Acids or salts thereof
- C04B22/10—Acids or salts thereof containing carbon in the anion
-
- 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
- C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
- C04B24/24—Macromolecular compounds
- C04B24/26—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
The invention discloses a multi-scale nano composite modified asphalt mixture and a preparation method thereof. According to the invention, the asphalt is subjected to composite modification treatment by adopting the multi-scale nano composite material and SBR, and the inorganic nanoparticles have the characteristics of few surface energy defects, many unpaired atoms, strong surface adsorption force and the like, so that the inorganic nanoparticles can be better combined with the base asphalt, and the modified asphalt has larger damage load; the raw materials used in the invention have wide sources and low price, and the prepared asphalt mixture has excellent road performance and has high-temperature, low-temperature and water stability which are obviously higher than those of the common asphalt mixture.
Description
Technical Field
The invention relates to the technical field of road engineering materials, in particular to a multi-scale nano composite modified asphalt mixture and a preparation method thereof.
Background
In recent years, due to the rapid development of national economy, the highway construction is more and more emphasized by our country, and the asphalt pavement has a plurality of advantages compared with the prior cement pavement. The asphalt pavement belongs to a flexible pavement and has the advantages of comfortable driving, low noise, high construction speed, no dust emission, easy repair and the like; the cement pavement is a rigid pavement and has high requirements on a roadbed, the pavement is extremely easy to damage after the roadbed deforms, and once local damage occurs, driving comfort is influenced, and the pavement is also greatly influenced.
Although asphalt pavement has many advantages, with the increasing complexity of road use environment, the increase of traffic volume and the deterioration of climate environment in recent years, the asphalt pavement is difficult to meet the use requirement; in addition, the asphalt pavement is aged by the action of temperature, light, water, ultraviolet rays and the like in the service process, so that the low-temperature crack resistance of the asphalt pavement is reduced, and the elasticity of the asphalt is reduced, thereby affecting the pavement performance of the asphalt.
The existing asphalt pavement can not simultaneously consider the damage of high temperature, low temperature and water stability to the pavement. Therefore, the development of the novel composite modified asphalt mixture can solve the problems of high and low temperature, water stability and the like of the pavement, and has important significance for the development of road engineering construction in the future.
Disclosure of Invention
The invention provides a multi-scale nano material modified asphalt mixture and a preparation method thereof, aiming at reducing high and low temperature diseases and water damage of an asphalt pavement while meeting the pavement performance of the asphalt mixture.
In order to solve the technical problems, the invention adopts the following technical scheme:
the multi-scale nano-material composite modified asphalt mixture is designed and prepared from the following raw materials in parts by weight:
90-110 parts of mineral aggregate, 3-9 parts of base asphalt, 0.12-0.28 part of stabilizer, 0.12-0.28 part of Styrene Butadiene Rubber (SBR) and 0.15-0.45 part of multi-scale nano material;
the multi-scale nano material comprises:
0.15-0.30 part of nano calcium carbonate modifier, 0.15-0.38 part of nano zinc oxide, 0.09-0.25 part of nano titanium dioxide modifier and 0.06-0.20 part of nano silicon dioxide modifier.
The preparation method of the nano calcium carbonate modifier comprises the following steps:
firstly, diluting a coupling agent with ethanol, then adding nano calcium carbonate and an improver into the coupling agent, then stirring for 15-25 min at 45-55 ℃, and finally drying at 105 ℃ to remove ethanol to obtain a nano calcium carbonate modifier, wherein the mass ratio of the nano calcium carbonate to the coupling agent to the improver is 1: 0.050 to 0.07: 0.01 to 0.02.
The preparation method of the nano zinc oxide modifier comprises the following steps:
firstly, diluting a coupling agent with ethanol, then adding nano zinc oxide and an improver into the coupling agent, then stirring for 35-45 min at the temperature of 60-80 ℃, and finally drying at the temperature of 105 ℃ to remove ethanol to obtain a nano zinc oxide modifier, wherein the mass ratio of the nano zinc oxide to the coupling agent to the improver is 1: 0.050 to 0.07: 0.01 to 0.02.
The preparation method of the nano titanium dioxide modifier comprises the following steps:
firstly, diluting a coupling agent with ethanol, then adding nano titanium dioxide and an improver into the coupling agent, then stirring for 15-25 min at 45-55 ℃, and finally drying at 105 ℃ to remove ethanol to obtain a nano titanium dioxide modifier, wherein the mass ratio of the nano titanium dioxide to the coupling agent to the improver is 1: 0.010-0.015: 0.01 to 0.02.
The preparation method of the nano silicon dioxide modifier comprises the following steps:
firstly, diluting a coupling agent with ethanol, then adding nano silicon dioxide and an improver into the coupling agent, then stirring for 15-25 min at 45-55 ℃, and finally drying at 105 ℃ to remove ethanol to obtain the nano silicon dioxide modifier, wherein the mass ratio of the nano silicon dioxide to the coupling agent to the improver is 1: 0.003 to 0.005: 0.01 to 0.02.
The coupling agent is at least one of KH-550, aluminate and KH-570.
Mixing vermiculite, distilled water, sodium chloride and hydrochloric acid in a ratio of 1: 2-4: 0.04-0.06: 0.02-0.04, stirring at a constant temperature of 50-60 ℃ for 2.5-3.5 h, and washing until the filtrate does not contain chloride ions; the treated vermiculite was then mixed with distilled water, cetyltrimethylammonium bromide in a 1: 0.8-1.2: 0.04-0.06, stirring at a constant speed for 1.5-2.5 h at 70-80 ℃, cooling, washing until the filtrate is free of chloride ions or/and bromide ions, drying, and sieving with a 250-350 mesh sieve to obtain the organic vermiculite.
The stabilizer is butyl rubber.
The basic asphalt is road petroleum asphalt, coal asphalt, SBS modified asphalt, PE modified asphalt or fiber modified asphalt.
The preparation method of the multi-scale nano-material composite modified asphalt mixture comprises the following steps:
(1) preparing a multi-scale nano material:
taking nano calcium carbonate, a coupling agent and an improving agent in a proportion of 1: 0.050 to 0.07: uniformly mixing the components in a mass ratio of 0.01-0.02 to obtain a nano calcium carbonate modifier;
taking nano zinc oxide, a coupling agent and an improving agent in a proportion of 1: 0.050 to 0.07: uniformly mixing the components in a mass ratio of 0.01-0.02 to obtain a nano zinc oxide modifier;
taking nano titanium dioxide, a coupling agent and an improving agent in a proportion of 1: 0.010-0.015: uniformly mixing the components in a mass ratio of 0.01-0.02 to obtain a nano titanium dioxide modifier;
taking nano silicon dioxide, a coupling agent and an improving agent, mixing the components in a proportion of 1: 0.003 to 0.005: uniformly mixing the raw materials in a mass ratio of 0.01-0.02 to obtain a nano silicon dioxide modifier;
(2) preparing multi-scale modified asphalt:
heating the base asphalt to 75-85 ℃ for melting and dewatering, heating to 130-140 ℃, adding the stabilizer and the nano zinc oxide modifier and the nano calcium carbonate modifier obtained in the step (1) according to the mixture ratio, mixing uniformly, naturally cooling, and standing for 20-30 h;
(3) preparation of multi-scale nano composite modified asphalt
Heating the modified asphalt obtained in the step (2) to 130-140 ℃, adding a titanium dioxide oxidant and a silicon dioxide oxidant, adding SBR after the titanium dioxide oxidant and the silicon dioxide oxidant are melted into the asphalt, and further melting the SBR and the asphalt under low-speed shearing stirring after the SBR is completely melted into the asphalt to finally obtain the multi-scale nano composite modified asphalt;
(4) preparing a mixture:
and (4) heating the mineral aggregate to 175-180 ℃, and then mixing the mineral aggregate with the modified asphalt obtained in the step (3) according to the corresponding proportion and uniformly stirring to obtain the modified asphalt.
In the step (2), a high-speed shearing machine is adopted for shearing, wherein the high-speed shearing is carried out for 20-30 min at a high speed of 3500-4500 r/min, and then the low-speed shearing is carried out for 5-15 min at a low speed of 4000-5000 r/min.
Compared with the prior art, the invention has the main beneficial technical effects that:
1. according to the invention, nano calcium carbonate, nano zinc oxide, nano titanium dioxide, nano silicon dioxide and SBR are adopted to carry out composite modification treatment on the asphalt, and the characteristics of less surface energy defects, more unpaired atoms, strong surface adsorption force and the like of inorganic nano particle nano calcium carbonate, nano zinc oxide, nano titanium dioxide and nano silicon dioxide are utilized, so that the asphalt can be better combined with the base asphalt, and the modified asphalt has larger destruction load.
2. After the nano composite modifier prepared by the invention is fused with the matrix asphalt, a net structure formed by nano calcium carbonate, nano zinc oxide, nano titanium dioxide and nano silicon dioxide is combined with the filling of SBR particles, so that the structural stability of the nano composite modifier becomes better, the connection between the modifier and the matrix asphalt becomes smoother, and the integral performance of the composite modified asphalt is improved (the high-temperature stability, the low-temperature crack resistance and the water stability are improved).
3. The nano calcium carbonate, nano zinc oxide, nano titanium dioxide, nano silicon dioxide and SBR composite modifier with excellent performance and good combination effect are obtained by screening, so that the nano composite asphalt mixture under the high-temperature condition has high binding power and viscosity and excellent high-temperature shear resistance.
4. The raw materials used in the invention have wide sources and low price, and the prepared asphalt mixture has excellent road performance and has high-temperature, low-temperature and water stability which are obviously higher than those of the common asphalt mixture.
Detailed Description
The following examples are given to illustrate specific embodiments of the present invention, but are not intended to limit the scope of the present invention in any way.
The instruments and devices referred to in the following examples are conventional instruments and devices unless otherwise specified; the industrial raw materials are all conventional industrial raw materials which are sold on the market, if not specifically mentioned.
Example 1: a multi-scale nano composite modified asphalt mixture is prepared from the following raw materials:
100 parts of AC-13 type mineral aggregate, 3 parts of SBS asphalt, 0.12 part of nano calcium carbonate, 0.15 part of nano zinc oxide, 0.09 part of nano titanium dioxide, 0.06 part of nano silicon dioxide, 0.12 part of Styrene Butadiene Rubber (SBR), 0.03 part of improver, 0.12 part of stabilizer (butyl rubber), 0.007 part of coupling agent (KH-550), 0.009 part of coupling agent, 0.001 part of coupling agent and 0.00024 part of coupling agent, which respectively correspond to the modification of nano calcium carbonate, nano zinc oxide, nano titanium dioxide and nano silicon dioxide.
Example 2: a multi-scale nano-material composite modified asphalt mixture is prepared from the following raw materials:
100 parts of AC-13 type mineral aggregate, 4 parts of coal pitch, 0.16 part of nano calcium carbonate, 0.20 part of nano zinc oxide, 0.12 part of nano titanium dioxide, 0.08 part of nano silicon dioxide, 0.16 part of Styrene Butadiene Rubber (SBR), 0.04 part of improver, 0.16 part of stabilizer (butyl rubber), 0.010 part of coupling agent (aluminate), KH-5700.012 parts, 0.00144 parts of aluminate and 0.0032 parts of aluminate, which respectively correspond to the modification of nano calcium carbonate, nano zinc oxide, nano titanium dioxide and nano silicon dioxide.
Example 3: a multi-scale nano-material composite modified asphalt mixture is prepared from the following raw materials:
100 parts of AC-13 type mineral aggregate, 4.5 parts of road petroleum asphalt, 0.18 part of nano calcium carbonate, 0.225 part of nano zinc oxide, 0.135 part of nano titanium dioxide, 0.09 part of nano silicon dioxide, 0.18 part of Styrene Butadiene Rubber (SBR), 0.045 part of improver, 0.18 part of stabilizer (butyl rubber), 0.0108 part of coupling agent (aluminate), 0.0135 part of coupling agent, 0.00162 part of coupling agent and 0.00036 part of nano calcium carbonate, nano zinc oxide, nano titanium dioxide and nano silicon dioxide are respectively modified.
Example 4: a multi-scale nano-material composite modified asphalt mixture is prepared from the following raw materials:
100 parts of AC-13 type mineral aggregate, 5 parts of road stone oil asphalt, 0.20 part of nano calcium carbonate, 0.25 part of nano zinc oxide, 0.15 part of nano titanium dioxide, 0.10 part of nano silicon dioxide, 0.20 part of Styrene Butadiene Rubber (SBR), 0.05 part of improver, 0.20 part of stabilizer (butyl rubber), 0.012 part of coupling agent (KH-550), 0.015 part of 0.0018 part of coupling agent and 0.0004 part of coupling agent, which respectively correspond to the modification of nano calcium carbonate, nano zinc oxide, nano titanium dioxide and nano silicon dioxide.
Example 5: a multi-scale nano-material composite modified asphalt mixture is prepared from the following raw materials:
100 parts of AC-13 type mineral aggregate, 6 parts of PE modified asphalt, 0.24 part of nano calcium carbonate, 0.30 part of nano zinc oxide, 0.18 part of nano titanium dioxide, 0.12 part of nano silicon dioxide, 0.24 part of Styrene Butadiene Rubber (SBR), 0.06 part of improver, 0.24 part of stabilizer (butyl rubber), 0.0144 part of coupling agent (KH-570), 0.018 part of aluminate, KH-5500.00216 parts and 0.00048 parts, which respectively correspond to the modification of nano calcium carbonate, nano zinc oxide, nano titanium dioxide and nano silicon dioxide.
Example 6: a multi-scale nano-material composite modified asphalt mixture is prepared from the following raw materials:
100 parts of AC-13 type mineral aggregate, 7 parts of fiber modified asphalt, 0.28 part of nano calcium carbonate, 0.35 part of nano zinc oxide, 0.21 part of nano titanium dioxide, 0.14 part of nano silicon dioxide, 0.28 part of Styrene Butadiene Rubber (SBR), 0.07 part of improver, 0.28 part of stabilizer (butyl rubber), 0.016 part of coupling agent, 0.021 part of coupling agent, 0.00252 part of coupling agent and 0.00056 part of coupling agent.
The preparation method of the multi-scale nano-material composite modified asphalt mixture in the above examples 1-6 comprises the following steps:
(1) the materials were prepared separately in the parts by weight described in examples 1-6.
(2) The preparation method of the improver organic vermiculite comprises the following steps:
sequentially adding vermiculite, distilled water, hydrochloric acid and sodium chloride with certain mass into a three-neck flask, controlling the temperature at 55 ℃, stirring at constant temperature for 3 hours, and setting the rotating speed at 300 r/m; then repeatedly carrying out suction filtration and washing until the liquid does not contain chloride ions; mixing the obtained vermiculite with distilled water again, adding cetyl trimethyl ammonium bromide, controlling the temperature at 75 ℃, stirring at a constant temperature and a constant speed for 2 hours, setting the rotating speed at 300 r/m, cooling to room temperature, performing suction filtration, repeatedly washing with deionized water until no chloride ions or bromide ions exist in the filtrate, drying the filter cake (the drying temperature is 105 ℃, the duration is 5 hours), and finally obtaining the organic vermiculite for later use
(3) Preparing a multi-scale nano material:
the nano calcium carbonate, the coupling agent and the improving agent are mixed in a ratio of 1: 0.06: preparing a nano calcium carbonate modifier according to the proportion of 0.01:
diluting absolute ethanol according to a certain proportion, adding KH-550 coupling agent into ethanol diluent, stirring for 5min, adding nano calcium carbonate and improver into the coupling agent diluent, and stirring at 50 deg.C at 300 rpm for 20 min; and finally, drying the mixture in a drying box at the temperature of 105 ℃ to prepare the nano calcium carbonate modifier.
The nano zinc oxide, the coupling agent and the improving agent are mixed in a ratio of 1: 0.06: preparing a nano zinc oxide modifier according to the proportion of 0.01: diluting absolute ethyl alcohol according to a certain proportion, adding the aluminate coupling agent into an ethanol diluent, stirring for 5 minutes, adding the nano calcium carbonate and the improver into the coupling agent diluent, and stirring at the rotating speed of 300 revolutions per minute for 40 minutes at 70 ℃; and finally, drying the mixture in a drying box at the temperature of 105 ℃ to prepare the nano zinc oxide modifier.
The preparation method of the nano titanium dioxide comprises the following steps:
firstly, diluting a coupling agent with ethanol, then adding nano titanium dioxide and an improver into the coupling agent, then stirring (300 revolutions per minute) for 20min at 50 ℃, and finally drying at 105 ℃ to remove ethanol to obtain the nano titanium dioxide modifier, wherein the mass ratio of the nano titanium dioxide to the coupling agent to the improver is 1: 0.013: 0.015.
the preparation method of the nano silicon dioxide modifier comprises the following steps:
firstly, diluting a coupling agent with ethanol, then adding nano silicon dioxide and an improver into the coupling agent, stirring the mixture for 20min at the rotating speed of 300 r/min at the temperature of 50 ℃, and finally drying the mixture at the temperature of 105 ℃ to remove the ethanol to obtain the nano silicon dioxide modifier, wherein the mass ratio of the nano silicon dioxide to the coupling agent to the improver is 1: 0.004: 0.015.
(2) preparing modified asphalt:
placing the basic asphalt into an oven, heating the asphalt at the temperature of 80 ℃ until the asphalt is completely melted for dehydration, weighing a certain amount of the basic asphalt after dehydration, placing the basic asphalt on a heating base of a high-speed shearing machine, setting the temperature to be 135 ℃ for heating, wherein the heating time is not more than 30min, and stirring the basic asphalt by using a glass rod in the heating process to prevent the asphalt from aging due to local heating. Adding a stabilizing agent and the obtained nano zinc oxide modifier during the stirring process, adding the obtained nano calcium carbonate modifier after the stabilizing agent and the obtained nano zinc oxide modifier are blended into the asphalt, naturally cooling the sample after the nano calcium carbonate modifier is completely blended into the asphalt, and standing for about 24 hours.
(3) Preparation of composite modified asphalt
And (3) reheating the sample to about 135 ℃ by the next day, adding a titanium dioxide oxidizing agent and a silicon dioxide oxidizing agent, adding SBR after the titanium dioxide oxidizing agent and the silicon dioxide oxidizing agent are melted into the asphalt, and further thinning the SBR under low-speed shearing stirring after the SBR is completely melted into the asphalt to finally prepare the multi-scale nano composite modified asphalt.
The shearing treatment process comprises the following steps: stabilizing the high-speed shearing machine at 4000 rpm, stirring for 25min, adjusting the high-speed shearing machine to 1500 rpm, and continuously shearing for 10 min.
(4) Preparing a multi-scale nano composite modified asphalt mixture:
and (3) mixing and stirring the mineral aggregate heated to 170-180 ℃ and the composite modified asphalt obtained in the step (3) uniformly according to a conventional method to obtain the modified asphalt.
The road performance tests were performed on the multi-scale nano-material composite modified asphalt mixtures obtained in examples 1 to 6, wherein the test items include a rutting test, a low-temperature trabecular bending test (-10 ℃), a freeze-thaw splitting test and a water-immersion marshall test, and the test results are shown in table 1 below, wherein the test items are used for testing the road performance of the ceramic fiber-doped multi-scale nano-material composite diatomite drainage asphalt mixture of the present invention, and are compared with the common asphalt mixture without the nano-material and with the SBR.
TABLE 1 results of tests on road performances of asphalt mixtures of examples 1 to 6 and comparative example
As can be seen from Table 1, the drainage asphalt mixture of the invention meets the relevant requirements of JTGF40-2004 technical Specification for construction of road asphalt pavement issued by Ministry of communications, and the indexes of high-temperature performance, low-temperature performance, water stability and the like of the drainage asphalt mixture are obviously higher than those of the common asphalt mixture, which shows that the pavement performance of the drainage asphalt mixture of the invention is superior.
The present invention is described in detail with reference to the examples above; however, those skilled in the art will understand that various changes in the above embodiments, or equivalent substitutions of related technical means (such as materials, steps and methods) can be made without departing from the technical idea of the invention, so as to form a plurality of specific embodiments, which are common variations of the invention and are not described in detail herein.
Claims (10)
1. The multi-scale nano-material composite modified asphalt mixture is characterized by being prepared from the following raw materials in parts by weight:
90-110 parts of mineral aggregate, 3-9 parts of base asphalt, 0.12-0.28 part of stabilizer butyl rubber, 0.12-0.28 part of styrene butadiene rubber and 0.15-0.45 part of multi-scale nano material;
the multi-scale nano material comprises:
0.15-0.30 part of nano calcium carbonate modifier, 0.15-0.38 part of nano zinc oxide, 0.09-0.25 part of nano titanium dioxide modifier and 0.06-0.20 part of nano silicon dioxide modifier.
2. The multi-scale nano-material composite modified asphalt mixture according to claim 1, wherein the nano calcium carbonate modifier is prepared by the following method:
firstly, diluting a coupling agent with ethanol, then adding nano calcium carbonate and an improver into the coupling agent, then stirring for 15-25 min at 45-55 ℃, and finally drying at 105 ℃ to remove ethanol to obtain a nano calcium carbonate modifier, wherein the mass ratio of the nano calcium carbonate to the coupling agent to the improver is 1: 0.050 to 0.07: 0.01 to 0.02.
3. The multi-scale nano-material composite modified asphalt mixture according to claim 1, wherein the preparation method of the nano zinc oxide modifier is as follows:
firstly, diluting a coupling agent with ethanol, then adding nano zinc oxide and an improver into the coupling agent, then stirring for 35-45 min at the temperature of 60-80 ℃, and finally drying at the temperature of 105 ℃ to remove ethanol to obtain a nano zinc oxide modifier, wherein the mass ratio of the nano zinc oxide to the coupling agent to the improver is 1: 0.050 to 0.07: 0.01 to 0.02.
4. The multi-scale nano-material composite modified asphalt mixture according to claim 1, wherein the preparation method of the nano titanium dioxide modifier is as follows:
firstly, diluting a coupling agent with ethanol, then adding nano titanium dioxide and an improver into the coupling agent, then stirring for 15-25 min at 45-55 ℃, and finally drying at 105 ℃ to remove ethanol to obtain a nano titanium dioxide modifier, wherein the mass ratio of the nano titanium dioxide to the coupling agent to the improver is 1: 0.010-0.015: 0.01 to 0.02.
5. The multi-scale nano-material composite modified asphalt mixture according to claim 1, wherein the preparation method of the nano silica modifier is as follows:
firstly, diluting a coupling agent with ethanol, then adding nano silicon dioxide and an improver into the coupling agent, then stirring for 15-25 min at 45-55 ℃, and finally drying at 105 ℃ to remove ethanol to obtain the nano silicon dioxide modifier, wherein the mass ratio of the nano silicon dioxide to the coupling agent to the improver is 1: 0.003 to 0.005: 0.01 to 0.02.
6. The multi-scale nanomaterial composite modified bituminous mixture of claim 4 or 5, wherein said coupling agent is at least one of KH-550, aluminate, and KH-570.
7. The multi-scale nano-material composite modified asphalt mixture according to claim 1, wherein the modifier is organic vermiculite, and the preparation method is as follows:
mixing vermiculite, distilled water, sodium chloride and hydrochloric acid in a ratio of 1: 2-4: 0.04-0.06: 0.02-0.04, stirring at a constant temperature of 50-60 ℃ for 2.5-3.5 h, and washing until the filtrate does not contain chloride ions; the treated vermiculite was then mixed with distilled water, cetyltrimethylammonium bromide in a 1: 0.8-1.2: 0.04-0.06, stirring at a constant speed for 1.5-2.5 h at 70-80 ℃, cooling, washing until the filtrate is free of chloride ions or/and bromide ions, drying, and sieving with a 250-350 mesh sieve to obtain the organic vermiculite.
8. The multi-scale nano-material composite modified asphalt mixture according to claim 1, wherein the base asphalt is road petroleum asphalt, coal asphalt, SBS modified asphalt, PE modified asphalt or fiber modified asphalt.
9. The method for preparing the multi-scale nano-material composite modified asphalt mixture according to claim 1, which is characterized by comprising the following steps:
(1) preparing a multi-scale nano material:
taking nano calcium carbonate, a coupling agent and an improving agent in a proportion of 1: 0.050 to 0.07: uniformly mixing the components in a mass ratio of 0.01-0.02 to obtain a nano calcium carbonate modifier;
taking nano zinc oxide, a coupling agent and an improving agent in a proportion of 1: 0.050 to 0.07: uniformly mixing the components in a mass ratio of 0.01-0.02 to obtain a nano zinc oxide modifier;
taking nano titanium dioxide, a coupling agent and an improving agent in a proportion of 1: 0.010-0.015: uniformly mixing the components in a mass ratio of 0.01-0.02 to obtain a nano titanium dioxide modifier;
taking nano silicon dioxide, a coupling agent and an improving agent, mixing the components in a proportion of 1: 0.003 to 0.005: uniformly mixing the raw materials in a mass ratio of 0.01-0.02 to obtain a nano silicon dioxide modifier;
(2) preparing multi-scale modified asphalt:
heating the base asphalt to 75-85 ℃ for melting and dewatering, heating to 130-140 ℃, adding the stabilizer and the nano zinc oxide modifier and the nano calcium carbonate modifier obtained in the step (1) according to the mixture ratio, mixing uniformly, naturally cooling, and standing for 20-30 h;
(3) preparation of multi-scale nano composite modified asphalt
Heating the modified asphalt obtained in the step (2) to 130-140 ℃, adding a titanium dioxide oxidant and a silicon dioxide oxidant, adding SBR after the modified asphalt is completely melted into the asphalt, and further melting the SBR under low-speed shearing stirring to obtain multi-scale nano composite modified asphalt;
(4) preparing a mixture:
and (4) heating the mineral aggregate to 175-180 ℃, and then mixing the mineral aggregate with the modified asphalt obtained in the step (3) according to the corresponding proportion and uniformly stirring to obtain the modified asphalt.
10. The preparation method of the multi-scale nano-material composite modified asphalt mixture according to claim 9, wherein in the step (2), a high-speed shearing machine is adopted for shearing, and the multi-scale nano-material composite modified asphalt mixture is firstly sheared at a high speed of 3500-4500 r/min for 20-30 min and then sheared at a low speed of 4000-5000 r/min for 5-15 min.
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