CN101602583B - Warm-mixed auxiliary agent for asphalt mixture and preparation method thereof - Google Patents
Warm-mixed auxiliary agent for asphalt mixture and preparation method thereof Download PDFInfo
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- CN101602583B CN101602583B CN2009100631277A CN200910063127A CN101602583B CN 101602583 B CN101602583 B CN 101602583B CN 2009100631277 A CN2009100631277 A CN 2009100631277A CN 200910063127 A CN200910063127 A CN 200910063127A CN 101602583 B CN101602583 B CN 101602583B
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Abstract
The invention relates to a warm-mixed auxiliary agent for asphalt mixture. The auxiliary agent is formed by uniformly mixing 93 to 97 percent of synthetic zeolite with 3 to 7 percent of granular sodium sulfate decahydrate by weight, wherein the synthetic zeolite includes 15 to 22 percent of crystal water, and the sodium sulfate decahydrate includes 55.9 percent of crystal water. Under normal temperature, the auxiliary agent is mixed with other raw materials according to the content of 0.3 to 0.5 percent of the total mass of the mixture, thereby preparing the product of the warm-mixed asphalt mixture; and other raw materials are 150 to 165 DEG C asphalt, 140 to 180 DEG C aggregate and mineral powder filling materials. During the blending of the mixture, the warm-mixed addition agent and the heated asphalt are added simultaneously, great amount of vapor generated by the moisture-containing auxiliary agent are released, which results in volumetric expansion of the asphalt, thereby forming foamed asphalt; meanwhile, the workability of the asphalt can be enhanced, the blending and mold temperature of the mixture can be reduced by 15 to 25 DEG C, exhaust emission can be effectively reduced, energy consumption is lowered, the aging of asphalt during blending is reduced, and the auxiliary agent has the advantages of simple preparation and low cost.
Description
Technical field
The invention belongs to the Materials Science and Engineering field, be specifically related to a kind of preparation method and Warm-Mix Bitumen Mixture of warm-mixed auxiliary agent for asphalt mixture.
Background technology
Current, energy shortage and topsoil are the human two big severe challenges that face jointly.For preserving the ecological environment, carbonic acid gas and other discharge of harmful gases are controlled in the countries in the world strictness, and energy-conservation and environmental protection has become the hot issue that the whole society pays close attention to, and the while is energy-conservation also to be to weigh a kind of utilisation technology maturation whether key index factor with environmental protection.The production of asphalt is energy consumption rich and influential family in the road engineering.Traditional hot-mix asphalt mixture is that a kind of heat is mixed thermopave, when mixing and stirring, paving and rolling, need higher temperature, thereby producing and the process of construction not only will consume a large amount of energy, and discharge a large amount of waste gas and dust, environmental quality around the influence and workmen's is healthy, and pitch also can produce thermal ageing and influence its pavement performance simultaneously.Particularly in the Long Tunnel Asphalt Pavement construction, high temperature that hot-mix asphalt mixture is caused in the tunnel and obnoxious flavour environment are just bigger to the harm of workmen and equipment.The cold-mix asphalt compound is although have certain advantage at environmental protection, aspect such as energy-conservation, because its pavement performance instability generally only is used for maintenance of surface.
In order to reduce energy consumption and exhaust gas emission, people begin to develop a kind of new energy saving and environment friendly asphalt, i.e. Warm-Mix Bitumen Mixture.Warm-Mix Bitumen Mixture is that a class is mixed and stirred temperature between hot-mix asphalt mixture (160 ℃～180 ℃) and cold-mix asphalt compound (10 ℃～40 ℃), and performance reaches the energy saving and environment friendly asphalt of (or approaching) hot-mix asphalt mixture.With regard to present state of the art, the temperature of mixing and stirring of Warm-Mix Bitumen Mixture generally remains on 120～135 ℃, pave and compacting temperature be 100～110 ℃, with respect to hot-mix asphalt mixture, temperature has reduced by 15～50 ℃.
The application of warm mix asphalt technologies with realizing the saving of energy cost in the Road construction, has also reduced the pollution to environment simultaneously, becomes another very promising emerging technology in asphalt pavement material field in recent years.
Summary of the invention
Technical problem to be solved by this invention is: a kind of auxiliary agent is provided, after this auxiliary agent joins conventional hot-mix asphalt mixture, can reduce mixing and stirring and compacting temperature of this asphalt, and the every technical indicator that has kept conventional hot-mix asphalt mixture, make it satisfy mechanical property and pavement performance, in engineering, use this Warm-Mix Bitumen Mixture can reduce energy consumption, reduce exhaust gas emission.
The present invention solves its technical problem and adopts following technical scheme:
Warm-mixed auxiliary agent for asphalt mixture provided by the invention, by mass, this auxiliary agent is formed by synthetic zeolite 93～97% and sal glauberi 3～7% mixings, and wherein, synthetic zeolite contains 15～22% crystal water, and sal glauberi contains 55.9% crystal water.
By mass, the chemical ingredients of described synthetic zeolite comprises: 26～35% SiO
2, 28～38% Al
2O
3, 15～20% Na
2O, the yellow-white powder, median size is 5～100 μ m, apparent density is 1.5～2.5g/cm
3
Described synthetic zeolite is made by following method, and its step comprises:
(1) flyash was pulverized 200 orders with top sieve after with sodium hydroxide by 1: 1.2～1: 1.5 thorough mixing of mass ratio, put then in the silver crucible in retort furnace at 600～800 ℃ of roasting temperature 1～3h, frit reaction obtains grog;
(2) with alkali grog is dissolved into solution, replenishes distilled water, sodium metaaluminate and sodium hydroxide and guarantee molar weight SiO in the solution
2/ Al
2O
3=1.4～2.0, Na
2O/SiO
2=1.6～3.0, H
2O/Na
2O=35～100 through mixing, stirring, get mixture then;
(3) mixture is put into there-necked flask, stir ageing 1～6h down at 40～80 ℃, stir speed (S.S.) is 100～600r/min, obtains reaction mixture;
(4) with reaction mixture in the electric heating constant temperature oil bath pan, 70～100 ℃ of following crystallization 3～24h filter simultaneously with distilled water flushing then to pH=10～11, in 80～85 ℃ of down dry 6～12h, obtain the synthetic zeolite product after the grinding.
Warm-mixed auxiliary agent for asphalt mixture provided by the invention, it mixes with other raw material according to 0.3～0.5% of total mass at normal temperatures, makes the product of Warm-Mix Bitumen Mixture; Other raw material is 150～165 ℃ pitch, 140～180 ℃ gather materials and mineral powder filling materials, and the proportioning of their quality is the proportioning of hot-mix asphalt mixture commonly used now.
Described Warm-Mix Bitumen Mixture can adopt following preparation process:
(1) after the hot pitch of temperature being mixed auxiliary agent and 150～165 ℃ joins simultaneously and 140～180 ℃ gather materials mixed and stirred for 90 seconds, adds mineral powder filling materials again and mixed and stirred for 90 seconds;
(2) hit real moulding, adopt Marshall compaction method, respectively hit real 75 times the warm-mixed asphalt concrete is two-sided, perhaps adopt the moulding of rolling method, come and go and roll 16～20 times, perhaps adopt the gyratory compaction method to select number of machine passes according to specific circumstances.
The proportioning of described hot-mix asphalt mixture commonly used can be: by mass, and pitch: gather materials: breeze=(3～6): (94～97): (0～6).
The pitch of warm-mixed auxiliary agent for asphalt mixture of the present invention and heating adds simultaneously, can make compound production mix and stir the relative conventional hot-mix asphalt mixture with mold temperature of temperature like this and reduce about 15～25 ℃.
The present invention compared with prior art mainly contains following advantage:
Warm-mixed auxiliary agent for asphalt mixture provided by the invention, after it adds pitch, the moisture that zeolite contains volatilizees gradually through some stages and is not to vapor away fully immediately, its moisture that discharges can expand in pitch and produce a kind of foam, this fine foam can make the pitch volumetric expansion, reduce asphalt viscosity, thereby improve the bituminous construction workability, this improvement can make pitch abundant parcel under lower temperature gather materials, realize that compound mixes and stirs and compacting under lower temperature, can be implemented under 125～140 ℃ of low temperatures and mix and stir moulding, and this point only could realize in the hot-mix asphalt mixture under 150～160 ℃ of high temperature in the past.
Its construction workability of this Warm-Mix Bitumen Mixture is improved, and is not acted upon by temperature changes.And segregation phenomenon does not appear in compound in the process of mixing and stirring, and illustrates that asphaltic binder is good with the bonding of gathering materials.
Warm-mixed auxiliary agent for asphalt mixture of the present invention can use with all common pitches and mix type, need not to prolong the mixing time, can not produce negative influence to the correlated performance of asphalt, its every technical indicator all near or be better than conventional asphalt, satisfy code requirement, be embodied in: the high temperature rut meets the demands, though introduced a spot of water, but anti-water damage property also can meet the demands, reduced asphalt and mixed and stirred temperature with compacting, can make compound production mix and stir temperature and reduce about 15～25 ℃.Save the energy, reduced exhaust gas discharging.
Description of drawings
Fig. 1 is a warm-mixed auxiliary agent for asphalt mixture synthetic schemes provided by the invention.
Fig. 2 is the synthesizer synoptic diagram that the present invention adopts.
Fig. 3 is the gradation curve of mineral aggregate synoptic diagram that the present invention adopts.
Among Fig. 2: 1. motor; 2. agitator arm; 3. thermometer; 4. there-necked flask; 5. electric mantle; 6. water-in; 7. water outlet; 8. prolong.
Embodiment
Warm-mixed auxiliary agent for asphalt mixture provided by the invention, its synthesis flow technology is as shown in Figure 1: more than flyash grinding and sieving 200 orders, get the lower part of screen branch, flyash ratio after NaOH and the processing is between 1.0～1.5, in 600～800 ℃ of fusion calcining 1～3h, obtain grog, grog is dissolved into solution, replenish distilled water, sodium metaaluminate and sodium hydroxide and guarantee molar weight SiO in the solution with alkali
2/ Al
2O
3=1.4～2.0, Na
2O/SiO
2=1.6～3.0, H
2O/Na
2O=35～100, through mixing, stirring, get mixture then, mixture is put into there-necked flask, stir ageing 1～6h down at 40～80 ℃, stir speed (S.S.) is 100～600r/min, obtains reaction mixture, with reaction mixture in the electric heating constant temperature oil bath pan, leave standstill crystallization 3～24h under 70～100 ℃, filter then simultaneously with distilled water flushing to pH=10～11,, obtain the synthetic zeolite product after the grinding in 80～85 ℃ of down dry 6～12h.
The present invention prepares in the warm-mixed auxiliary agent for asphalt mixture in the synthetic zeolite process, and used synthesizer is that chemical experiment is common.Its principle of work is: referring to Fig. 2, carry out thermostatically heating by the material in 5 pairs of there-necked flasks of electric mantle 4, this temperature is measured by thermometer 3, material reacts in there-necked flask, changes the rotating speed of motor 1 by the adjusting motor transmission, thereby controls the stir speed (S.S.) of 2 pairs of materials of agitator arm, the evaporation and the backflow of prolong 8 control reaction solns, water-in 6 cools off the steam in the prolong for running water inlet, and water outlet 7 is the outlet of tap water, and it is very convenient to operate.
In order to understand the present invention better, further illustrate content of the present invention below in conjunction with embodiment, but content of the present invention not only is confined to the following examples; Embodiment all is not a limitation of the present invention.
Embodiment 1:
Adopt the Superpave gradation design method to carry out the grating design, with Superpave12.5 is example, adopt the rotary compactor moulding, the forming pressure of rotary compactor is 600KPa, the design rotation times is N-Initial=9, N-Design=125 and N-Max=205 (add-on of warm-mixed auxiliary agent for asphalt mixture be the asphalt total mass 0.4%):
1. pitch: the SBS modifying asphalt that adopts Ezhou, Hubei Ke Shi bituminous material company limited to provide, its specification of quality meets " asphalt highway construction technique normalizing " (JTG F40-2004).
2. warm-mixed auxiliary agent for asphalt mixture:
The warm-mixed asphalt auxiliary agent is made up of synthetic zeolite and sal glauberi, and its ratio is 96: 4, and its mixture is 13.6% in the burst size of 125 ℃ of dry 2h water, is 21.5% in the burst size of 200 ℃ of successive drying 2h water.
The synthetic zeolite technical indicator is: yellow-white powder, SiO
2Content be 30.6%, Al
2O
3Content be 31.3%, Na
2The content of O is 17.7%, at 125 ℃ of dry 2h crystal water discharging amounts 11.8%, be 20.1% at 200 ℃ of continuous 2h crystal water discharging amounts.
The preparation technology of synthetic zeolite can be: with flyash pulverized 300 mesh sieves then with sodium hydroxide by 1: 1.4 thorough mixing of mass ratio, put in the silver crucible in retort furnace at 750 ℃ of roasting temperature 1.5h, frit reaction obtains grog.With the solution of grog preparation behind the alkali fusion, according to SiO
2/ Al
2O
3=1.8 (mol ratios), Na
2O/SiO
2=1.8 (mol ratios), H
2O/Na
2The proportioning of O=60 (mol ratio), replenishing an amount of distilled water, sodium metaaluminate and sodium hydroxide mixes, stir, add this mixture in the there-necked flask in right amount, stirring ageing 3h stir speed (S.S.)s at 70 ℃ is 550 commentariess on classics/min, obtains reaction mixture 95 ℃ of following crystallization 6h in the electric heating constant temperature oil bath pan, then filtration simultaneously with distilled water flushing to pH=10～11, dry 10h under 80 ℃ obtains product after the grinding.
3. mineral aggregate:
The coarse aggregate of this experiment is a high-quality basalt, and fine aggregate is a limestone mechanism sand, and breeze is a fat lime rock breeze, and the mineral aggregate performance meets " asphalt highway construction technique normalizing " (JTG F40-2004) regulation, and the mineral aggregate formate gradation composition sees Fig. 2 for details.
4. Warm-Mix Bitumen Mixture is mixed and stirred the primary election with mold temperature:
According to " asphalt highway construction technique normalizing " JTGF40-2004, the best that has of conventional hot-mix asphalt mixture is mixed and stirred temperature, mold temperature.With the best mix and stir temperature, mold temperature is that mixing and stirring of compound and compaction moulding are carried out in the per 10 ℃ temperature interval of benchmark, measure that the compound difference is mixed and stirred and mold temperature under density, the variation of voidage.If under lower temperature, can reach the indexs such as voidage, Marshall residual stability, cleavage strength and dynamic stability of the asphalt of code requirement, then can determine the amplitude that it has cooling-down effect and can determine its cooling.
According to " asphalt highway construction technique normalizing " JTGF40-2004, the Heating temperature of SBS modifying asphalt is 165 ℃, and hydrous zeolite is adding simultaneously with pitch when mixing and stirring.The mold temperature that test is adopted is as shown in table 1, be incubated 2h before the moulding at a certain temperature, to guarantee the stability of mold temperature, asphalt compacting compacting and bulk properties see Table 2, wherein lower the temperature 10 ℃, lower the temperature 20 ℃, lower the temperature 30 ℃ respectively representative the best of mixing and stirring the relative conventional asphalt for preparing by the SBS modifying asphalt of having added the compound of auxiliary agent preparation with compacting temperature mix and stir and mold temperature reduces by 10 ℃, 20 ℃, 30 ℃.
5. Warm-Mix Bitumen Mixture is mixed and stirred and the determining of mold temperature:
Lower the temperature formed mixed material under best asphalt content condition by hot-mix asphalt mixture and adding auxiliary agent that the SBS modifying asphalt prepares, soak Marshall Test, freeze thawing cleavage strength respectively than test and wheel tracking test, its test-results is respectively as table 3,4 and 5.Immersion Marshall Test, the freeze thawing cleavage strength of the asphalt that mixes and stirs moulding of lowering the temperature as can be seen from the table 20 ℃ all satisfies code requirement than test and wheel tracking test, and immersion Marshall Test, the freeze thawing cleavage strength of the asphalt that mixes and stirs moulding of lowering the temperature 30 ℃ are not all to satisfy code requirement than test and wheel tracking test.So decidable synthetic warm-mixed auxiliary agent for asphalt mixture cooling extent is 20 ℃.
Embodiment 2:
With dense-graded asphalt concrete compound AC-13 is example (add-on of warm-mixed auxiliary agent for asphalt mixture be asphalt total mass 0.5%):
1. pitch: No. 90 bi tumenf orr oads that adopt the Panjin north, Liaoning pitch limited-liability company to provide, its specification of quality meets " asphalt highway construction technique normalizing " (JTG F40-2004).
2. warm-mixed auxiliary agent for asphalt mixture:
The warm-mixed asphalt auxiliary agent is made up of synthetic zeolite and sal glauberi, and its mass ratio is 95: 5, and its mixture is 13.8% in the burst size of 125 ℃ of dry 2h water, is 19.7% in the burst size of 200 ℃ of successive drying 2h water.
The synthetic zeolite technical indicator is: yellow-white powder, SiO
2Content be 30.6%, Al
2O
3Content be 29.2%, Na
2The content of O is 16.1%, at 125 ℃ of dry 2h crystal water discharging amounts 11.6%, be 17.8% at 200 ℃ of continuous 2h crystal water discharging amounts.
The preparation technology of synthetic zeolite can be: with flyash pulverized 300 mesh sieves then with sodium hydroxide by 1: 1.5 thorough mixing of mass ratio, put in the silver crucible in retort furnace at 700 ℃ of roasting temperature 2h, frit reaction obtains grog.With the solution of grog preparation behind the alkali fusion, according to SiO
2/ Al
2O
3=1.68 (mol ratios), Na
2O/SiO
2=2.1 (mol ratios), H
2O/Na
2The proportioning of O=50.3 (mol ratio), replenishing an amount of distilled water, sodium metaaluminate and sodium hydroxide mixes, stir, add this mixture in the there-necked flask in right amount, stirring ageing 4h stir speed (S.S.)s at 70 ℃ is 550 commentariess on classics/min, obtains reaction mixture 95 ℃ of following crystallization 8h in the electric heating constant temperature oil bath pan, then filtration simultaneously with distilled water flushing to pH=10～11, dry 10h under 80 ℃ obtains product after the grinding.
3. mineral aggregate: the coarse aggregate of this experiment is a high-quality basalt, and fine aggregate is a limestone mechanism sand, and breeze is a fat lime rock breeze, and the mineral aggregate performance meets " asphalt highway construction technique normalizing " (JTG F40-2004) regulation, and its formate gradation composition sees Table 6.
4. Warm-Mix Bitumen Mixture is mixed and stirred the primary election with mold temperature:
According to " asphalt highway construction technique normalizing " JTGF40-2004, the Heating temperature of No. 90 bi tumenf orr oads is 155 ℃, and hydrous zeolite is adding simultaneously with pitch when mixing and stirring.The mold temperature that test is adopted is as shown in table 7, be incubated 2h before the moulding at a certain temperature, to guarantee the stability of mold temperature, the Marshall volume performance sees Table 8 under the best asphalt content, wherein lower the temperature 15 ℃, lower the temperature 25 ℃, lower the temperature 35 ℃ respectively representative the best of mixing and stirring the conventional hot-mix asphalt mixture that relative No. 90 bi tumenf orr oads with compacting temperature prepare of having added the compound of auxiliary agent preparation mix and stir and mold temperature reduces by 15 ℃, 25 ℃, 35 ℃.
5. Warm-Mix Bitumen Mixture is mixed and stirred and the determining of mold temperature:
Conventional asphalt that is prepared by No. 90 bi tumenf orr oads and the asphalt that adds auxiliary agent cooling moulding are under best asphalt content condition, soak Marshall Test, freeze thawing cleavage strength respectively than test and wheel tracking test, its test-results is respectively as table 9, and 10 and 11.Immersion Marshall Test, the freeze thawing cleavage strength of the asphalt that mixes and stirs moulding of lowering the temperature as can be seen from the table 25 ℃ all satisfies code requirement than test and wheel tracking test, and immersion Marshall Test, the freeze thawing cleavage strength of the asphalt that mixes and stirs moulding of lowering the temperature 35 ℃ are not all to satisfy code requirement than test and wheel tracking test.So decidable synthetic warm-mixed auxiliary agent for asphalt mixture cooling extent is 25 ℃.
Embodiment 3:
With grating bituminous concrete mixture AC-20 is example (add-on of warm-mixed auxiliary agent for asphalt mixture be asphalt total mass 0.3%):
1. pitch: No. 70 bi tumenf orr oads that adopt Ezhou, Hubei Ke Shi bituminous material company limited to provide, its specification of quality meets " asphalt highway construction technique normalizing " (JTG F40-2004).
2. warm-mixed auxiliary agent for asphalt mixture:
The warm-mixed asphalt auxiliary agent is made up of synthetic zeolite and sal glauberi, and its mass ratio is 94: 6, and its mixture is 13.0% in the burst size of 125 ℃ of dry 2h water, is 18.7% in the burst size of 200 ℃ of successive drying 2h water.
The technical indicator of synthetic zeolite is: yellow-white powder, SiO
2Content be 26.28%, Al
2O
3Content be 28.32%, Na
2The content of O is 17.36%, at 125 ℃ of dry 2h crystal water discharging amounts 10.3%, be 16.3% at 200 ℃ of continuous 2h crystal water discharging amounts.
The preparation technology of synthetic zeolite is as follows:
With flyash pulverized 300 mesh sieves then with sodium hydroxide by 1: 1.2 thorough mixing of mass ratio, put in the silver crucible in retort furnace at 650 ℃ of roasting temperature 60min, frit reaction obtains grog.With the solution of grog preparation behind the alkali fusion, according to SiO
2/ Al
2O
3=1.56 (mol ratios), Na
2O/SiO
2=2.63 (mol ratios), H
2O/Na
2The proportioning of O=46.25 (mol ratio), replenishing an amount of distilled water, sodium metaaluminate and sodium hydroxide mixes, stir, add this mixture in the there-necked flask in right amount, stirring ageing 2h stir speed (S.S.)s at 65 ℃ is 400r/min, obtains reaction mixture 90 ℃ of following crystallization 8h in the electric heating constant temperature oil bath pan, filters then simultaneously with distilled water flushing to pH=10～11, dry 12h under 80 ℃ obtains product after the grinding.
3. mineral aggregate:
The coarse aggregate of this experiment is a high-quality basalt, and fine aggregate is a limestone mechanism sand, and breeze is a fat lime rock breeze, and the mineral aggregate performance meets " asphalt highway construction technique normalizing " (JTG F40-2004) regulation, and its formate gradation composition sees table 12 for details.
4. Warm-Mix Bitumen Mixture is mixed and stirred the primary election with mold temperature:
According to " asphalt highway construction technique normalizing " JTGF40-2004, the Heating temperature of No. 70 bi tumenf orr oads is 155 ℃, and hydrous zeolite is adding simultaneously with pitch when mixing and stirring.The mold temperature that test is adopted is as shown in table 13, be incubated 2h before the moulding at a certain temperature, to guarantee the stability of mold temperature, the Marshall volume performance sees Table 14 under the best asphalt content, wherein lower the temperature 15 ℃, lower the temperature 25 ℃, representative the best of mixing and stirring the conventional hot-mix asphalt mixture that relative No. 70 bi tumenf orr oads with compacting temperature prepare of having added the compound of auxiliary agent preparation is mixed and stirred and mold temperature reduces by 15 ℃, 25 ℃ respectively.
5. Warm-Mix Bitumen Mixture is mixed and stirred and the determining of mold temperature:
Conventional asphalt that is prepared by No. 70 bi tumenf orr oads and the asphalt that adds auxiliary agent cooling moulding are under best asphalt content condition, soak Marshall Test, freeze thawing cleavage strength respectively than test and wheel tracking test, its test-results is respectively as table 15,16 and 17.Immersion Marshall Test, the freeze thawing cleavage strength of the asphalt that mixes and stirs moulding of lowering the temperature as can be seen from the table 15 ℃ all satisfies code requirement than test and wheel tracking test, and immersion Marshall Test, the freeze thawing cleavage strength of the asphalt that mixes and stirs moulding of lowering the temperature 25 ℃ are not all to satisfy code requirement than test and wheel tracking test.So decidable synthetic warm-mixed auxiliary agent for asphalt mixture cooling extent is 15 ℃.
Subordinate list
The temperature parameter of table 1 asphalt
| The asphalt type | The zeolite addition accounts for compound (%) | Aggregate temperature (℃) | Asphalt temperature (℃) | Mix and stir temperature (℃) | Mold temperature (℃) |
| Hot-mix asphalt mixture | Do not have | 190 | 165 | 165 | 155 |
| Lower the temperature 10 ℃ | 0.4 | 180 | 165 | 155 | 145 |
| Lower the |
0.4 | 170 | 165 | 145 | 135 |
| Lower the temperature 30 ℃ | 0.4 | 160 | 165 | 135 | 125 |
Compacting compacting of table 2 asphalt and bulk properties
Table 3 immersion Marshall Test result
| The asphalt type | Asphalt content (%) | Maximum theory density Gmm (g/cm 3) | Test specimen density Gmb (two-sided 75 times, g/cm 3) | Voidage (%) | Marshall stability (KN) | Immersion Marshall stability (KN) | Residual stability is than (%) |
| Hot-mix asphalt mixture | 4.67 | 2.654 | 2.537 | 4.4 | 12.8 | 11.4 | 89.0 |
| Lower the temperature 10 ℃ | 4.58 | 2.653 | 2.548 | 4.3 | 12.2 | 10.5 | 86.0 |
| Lower the |
4.67 | 2.650 | 2.540 | 4.5 | 11.8 | 10.6 | 90.0 |
| Lower the temperature 30 ℃ | 4.76 | 2.647 | 2.522 | 4.7 | 11.9 | 9..0 | 75.6 |
| Technical requirements | - | - | - | 4～7 | ＞8 | - | ＞85 |
Table 4 freeze thawing cleavage strength is than the test result
| Asphalt content (%) | Maximum theory density Gmm (g/cm 3) | Test specimen density Gmb (two-sided each 50 times, g/cm 3) | Voidage (%) | Non-freeze thawing cleavage strength (25 ℃, MPa) | The freeze thawing cleavage strength (25 ℃, MPa) | Cleavage strength is than (%) | |
| Hot-mix asphalt mixture | 4.67 | 2.654 | 2.489 | 6.2 | 1.09 | 0.97 | 89.0 |
| Lower the temperature 10 ℃ | 4.58 | 2.653 | 2.485 | 6.4 | 1.02 | 0.85 | 83.3 |
| Lower the |
4.67 | 2.650 | 2.482 | 6.3 | 0.97 | 0.83 | 85.6 |
| Lower the temperature 30 ℃ | 4.76 | 2.647 | 2.470 | 6.7 | 0.93 | 0.70 | 75.3 |
| Technical requirements | - | - | - | 6～8 | - | - | ＞80 |
Table 5 wheel tracking test result
Annotate: 60 ℃ of test temperatures, tire pressure 0.7MPa.
Table 6 synthesizes mineral aggregate gradation
| Size of mesh (mm) | 16 | 13.2 | 9.5 | 4.75 | 2.36 | 1.18 | 0.6 | 0.3 | 0.15 | 0.075 |
| The grating upper limit (%) | 100.0 | 100.0 | 85.0 | 68.0 | 50.0 | 38.0 | 28.0 | 20.0 | 15.0 | 8.0 |
| Grating lower limit (%) | 100.0 | 90.0 | 68.0 | 38.0 | 24.0 | 15.0 | 10.0 | 7.0 | 5.0 | 4.0 |
| Grating intermediate value (%) | 100.0 | 95.0 | 76.5 | 53.0 | 37.0 | 26.5 | 19.0 | 13.5 | 10.0 | 6.0 |
| Formate gradation composition (%) | 100.0 | 96.2 | 77.2 | 55.3 | 38.2 | 21.1 | 18.2 | 12.6 | 8.5 | 5.6 |
The temperature parameter of table 7 asphalt
| The asphalt type | The zeolite addition accounts for compound (%) | Aggregate temperature (℃) | Asphalt temperature (℃) | Mix and stir temperature (℃) | Mold temperature (℃) |
| Hot-mix asphalt mixture | Do not have | 170 | 155 | 150 | 140 |
| Lower the temperature 15 ℃ | 0.5 | 155 | 155 | 135 | 125 |
| Lower the temperature 25 ℃ | 0.5 | 145 | 155 | 125 | 115 |
| Lower the temperature 35 ℃ | 0.5 | 135 | 155 | 115 | 105 |
Marshall volume performance under the best asphalt content of table 8
| The asphalt type | Best asphalt content (%) | Maximum theory density Gmm (g/cm 3) | Test specimen density Gmb (two-sided each 75 times, g/cm 3) | Voidage (%) | Void in mineral aggregate (%) | Pitch saturation ratio (%) |
| Hot-mix asphalt mixture | 5.12 | 2.692 | 2.557 | 5.0 | 17.8 | 71.8 |
| Lower the temperature 15 ℃ | 4.94 | 2.695 | 2.554 | 5.2 | 17.5 | 70.1 |
| Lower the temperature 25 ℃ | 5.12 | 2.69 | 2.558 | 4.9 | 17.7 | 72.2 |
| Lower the temperature 35 ℃ | 5.30 | 2.683 | 2.534 | 5.6 | 18.7 | 70.2 |
| Technical requirements | - | - | 3～6 | ≥15 | 65～75 |
Table 9 immersion Marshall Test result
| The asphalt type | Marshall stability (KN) | Immersion Marshall stability (KN) | Residual stability is than (%) |
| Hot-mix asphalt mixture | 12.8 | 10.9 | 85.2 |
| Lower the temperature 15 ℃ | 12.2 | 10 | 82.0 |
| Lower the temperature 25 ℃ | 11.8 | 9.7 | 82.2 |
| Lower the temperature 35 ℃ | 11.9 | 9..0 | 75.6 |
| Technical requirements | ＞8 | - | ＞80 |
Table 10 freeze thawing cleavage strength is than the test result
| Asphalt content (%) | Maximum theory density Gmm (g/cm 3) | Test specimen density Gmb (two-sided each 50 times, g/cm 3) | Voidage (%) | Non-freeze thawing cleavage strength (25 ℃, MPa) | The freeze thawing cleavage strength (25 ℃, MPa) | Cleavage strength is than (%) | |
| Hot-mix asphalt mixture | 5.12 | 2.692 | 2.522 | 6.3 | 0.92 | 0.75 | 81.5 |
| Lower the temperature 15 ℃ | 4.94 | 2.695 | 2.514 | 6.7 | 0.88 | 0.68 | 77.2 |
| Lower the temperature 25 ℃ | 5.12 | 2.69 | 2.521 | 6.3 | 0.97 | 0.78 | 80.4 |
| Lower the temperature 35 ℃ | 5.30 | 2.683 | 2.500 | 6.8 | 0.85 | 0.60 | 70.6 |
| Technical requirements | - | - | - | 6～8 | - | - | ＞75 |
Table 11 wheel tracking test result
Annotate: 60 ℃ of test temperatures, tire pressure 0.7MPa.
Table 12 synthesizes mineral aggregate gradation
| Size of mesh (mm) | 26.5 | 19 | 16 | 13.2 | 9.5 | 4.75 | 2.36 | 1.18 | 0.6 | 0.3 | 0.15 | 0.075 |
| The grating upper limit (%) | 100 | 100 | 92 | 80 | 72 | 56 | 44 | 33 | 24 | 17 | 13 | 7 |
| Grating lower limit (%) | 100 | 90 | 78 | 62 | 50 | 26 | 16 | 12 | 8 | 5 | 4 | 3 |
| Grating intermediate value (%) | 100 | 95 | 85 | 71 | 61 | 41 | 30 | 22.5 | 16 | 11 | 8.5 | 5 |
| Formate gradation composition (%) | 100 | 96.2 | 86.1 | 72.3 | 65.3 | 45.3 | 36.4 | 20.1 | 15.6 | 10.7 | 7.3 | 5.6 |
The temperature parameter of table 13 asphalt
| The asphalt type | The zeolite addition accounts for compound (%) | Aggregate temperature (℃) | Asphalt temperature (℃) | Mix and stir temperature (℃) | Mold temperature (℃) |
| Hot-mix asphalt mixture | Do not have | 175 | 160 | 160 | 150 |
| Lower the temperature 15 ℃ | 0.3 | 160 | 160 | 145 | 135 |
| Lower the temperature 25 ℃ | 0.3 | 150 | 160 | 135 | 125 |
Marshall volume performance under the best asphalt content of table 14
| The asphalt type | Best asphalt content (%) | Maximum theory density Gmm (g/cm 3) | Test specimen density Gmb (two-sided each 75 times, g/cm 3) | Voidage (%) | Void in mineral aggregate (%) | Pitch saturation ratio (%) |
| Hot-mix asphalt mixture | 4.3 | 2.608 | 2.490 | 4.5 | 15.0 | 69.8 |
| Lower the temperature 15 ℃ | 4.3 | 2.599 | 2.471 | 5.0 | 15.3 | 67.8 |
| Lower the temperature 25 ℃ | 4.5 | 2.591 | 2.462 | 5.0 | 15.8 | 68.4 |
| Technical requirements | - | - | - | 3～6 | ≥14 | 65～75 |
Table 15 immersion Marshall Test result
| The asphalt type | Marshall stability (KN) | Immersion Marshall stability (KN) | Residual stability is than (%) |
| Hot-mix asphalt mixture | 13.5 | 11.9 | 88.1 |
| Lower the temperature 15 ℃ | 12.9 | 11.6 | 90.0 |
| Lower the temperature 25 ℃ | 11.6 | 8.3 | 71.6 |
| Technical requirements | ＞8 | - | ＞80 |
Table 16 freeze thawing cleavage strength is than the test result
| Asphalt content (%) | Maximum theory density Gmm (g/cm 3) | Test specimen density Gmb (two-sided each 50 times, g/cm 3) | Voidage (%) | Non-freeze thawing cleavage strength (25 ℃, MPa) | The freeze thawing cleavage strength (25 ℃, MPa) | Cleavage strength is than (%) | |
| Hot-mix asphalt mixture | 4.3 | 2.608 | 2.439 | 6.5 | 0.92 | 0.75 | 81.5 |
| Lower the temperature 15 ℃ | 4.3 | 2.599 | 2.436 | 6.3 | 0.88 | 0.71 | 80.7 |
| Lower the temperature 25 ℃ | 4.5 | 2.591 | 2.417 | 6.7 | 0.81 | 0.56 | 69.1 |
| Technical requirements | - | - | - | 6～8 | - | - | ＞75 |
Table 17 wheel tracking test result
Annotate: 60 ℃ of test temperatures, tire pressure 0.7MPa.
Claims (4)
1. warm-mixed auxiliary agent for asphalt mixture, it is characterized in that: by mass, this auxiliary agent is formed by synthetic zeolite 93～97% and granulous sal glauberi 3～7% mixings, wherein, synthetic zeolite contains 15～22% crystal water, and sal glauberi contains 55.9% crystal water; The chemical ingredients of described synthetic zeolite comprises: by mass, and 26～35% SiO
2, 28～38% Al
2O
3, 15～20% Na
2O, the yellow-white powder, median size is 5～100 μ m, apparent density is 1.5～2.5g/cm
3
2. warm-mixed auxiliary agent for asphalt mixture as claimed in claim 1 is characterized in that making synthetic zeolite by following method, and its step comprises:
(1) flyash was pulverized 200 orders with top sieve after with sodium hydroxide by 1: 1.2～1: 1.5 thorough mixing of mass ratio, put then in the silver crucible in retort furnace at 600～800 ℃ of roasting temperature 1～3h, frit reaction obtains grog;
(2) with alkali grog is dissolved into solution, replenishes distilled water, sodium metaaluminate and sodium hydroxide and guarantee molar weight SiO in the solution
2/ Al
2O
3=1.4～2.0, Na
2O/SiO
2=1.6～3.0, H
2O/Na
2O=35～100 through mixing, stirring, get mixture then;
(3) mixture is put into there-necked flask, stir ageing 1～6h down at 40～80 ℃, stir speed (S.S.) is 100～600r/min, obtains reaction mixture;
(4) with reaction mixture in the electric heating constant temperature oil bath pan, 70～100 ℃ of following crystallization 3～24h filter simultaneously with distilled water flushing then to pH=10～11, in 80～85 ℃ of down dry 6～12h, obtain the synthetic zeolite product after the grinding.
3. as the purposes of warm-mixed auxiliary agent for asphalt mixture as described in arbitrary claim in the claim 1 to 2, it is characterized in that at normal temperatures, warm-mixed auxiliary agent for asphalt mixture mixes with other raw material according to 0.3～0.5% of compound total mass, makes the product of Warm-Mix Bitumen Mixture; Other raw material is 150～165 ℃ pitch, 140～180 ℃ gather materials and mineral powder filling materials, and the proportioning of their quality is the proportioning of hot-mix asphalt mixture commonly used now.
4. purposes as claimed in claim 3 is characterized in that: the pitch of warm-mixed auxiliary agent for asphalt mixture and heating adds simultaneously.
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| CN111978012A (en) * | 2020-07-10 | 2020-11-24 | 苏州中恒通路桥股份有限公司 | Preparation method of novel warm-mixed asphalt mixture |
| CN115418107B (en) * | 2022-08-30 | 2023-03-10 | 福州大学 | Regenerated asphalt and preparation method thereof |
| CN115636981B (en) * | 2022-11-01 | 2023-05-23 | 重庆交通大学 | Hydrogenation reducing agent for repairing aged asphalt structure and preparation method thereof |
| CN116903297B (en) * | 2023-07-20 | 2024-03-22 | 聊城市交通发展有限公司 | Warm mix asphalt mixture containing reclaimed materials and preparation method thereof |
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