CN104291737B - A kind of preparation method of composite modified asphalt - Google Patents
A kind of preparation method of composite modified asphalt Download PDFInfo
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- CN104291737B CN104291737B CN201410503257.9A CN201410503257A CN104291737B CN 104291737 B CN104291737 B CN 104291737B CN 201410503257 A CN201410503257 A CN 201410503257A CN 104291737 B CN104291737 B CN 104291737B
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Abstract
The invention provides a kind of preparation method of composite modified asphalt, comprise the following steps: one, take the sillimanite powder of certain mass percent, andaluzite powder and andesite powder, then the various breezes after taking are mixed, obtain mixed powder; Two, dispersion agent is joined in mixed powder mix, obtain the mixed powder after dispersion treatment; Three, tensio-active agent is joined in the mixed powder after dispersion treatment mix, obtain the mixed powder after solubilising process; Four, the mixed powder after solubilising process is soaked in dehydrated alcohol, after oven dry, obtains composite modified additive; Five, composite modified additive is joined in matrix pitch, carry out shearing treatment after intensification, obtain composite modified asphalt.The composite modified asphalt adopting the present invention to prepare while the good pavement performance of guarantee, can have satisfactory stability and weather resistance.
Description
Technical field
The invention belongs to technical field of road engineering materials, be specifically related to a kind of preparation method of composite modified asphalt.
Background technology
Along with the fast development that highway in China is built, bituminous pavement has the plurality of advantages such as surfacing, simple maintenance low without seam, noise and is widely used in Road construction because of it.But easily there is rut when summer high temperature in bituminous pavement, easily crack is there is in winter time cold, top course can also occur loose, peel off, the disease such as bellding, surface grinding, ageing of asphalt, pavement seepage, make the also corresponding shortening of the service performance of bituminous pavement and work-ing life, bring loss to national economy.And performance of modified bitumen prepared by existing properties-correcting agent single, add poor, the not resistance to migration of operability in man-hour, easily separate out material surface and water suction deliquescence, simultaneously most modifying asphalt all there is properties-correcting agent with the system stability that bitumen compatibility is bad, formed not by force, the problems such as execution conditions require strictly, curing time is long, expensive.Therefore, develop that a kind of cheap, preparation technology is simple, the composite modified asphalt of excellent property has important practical significance.
Summary of the invention
Technical problem to be solved by this invention is, for above-mentioned the deficiencies in the prior art, to provide a kind of preparation method of composite modified asphalt.The composite modified asphalt adopting the method to prepare can while the good pavement performance of guarantee, and have flame retardant properties concurrently, anti-acid and alkali substance corrodes, and has satisfactory stability, fundamentally can improve the difficult problem that bituminous pavement is inflammable when there is traffic accident.
For solving the problems of the technologies described above, the technical solution used in the present invention is: a kind of preparation method of composite modified asphalt, is characterized in that, the method comprises the following steps:
Step one, take the various breezes of following mass percent: sillimanite powder 23% ~ 77.7%, andaluzite powder 21% ~ 76.1%, andesite powder 0.9% ~ 1.6%; Then the various breezes after taking are mixed, obtain mixed powder;
Step 2, dispersion agent joined in mixed powder described in step one mix, obtain the mixed powder after dispersion treatment; Described dispersion agent is the aqueous isopropanol of stearylamide, and in the aqueous isopropanol of described stearylamide, the mass ratio of stearylamide and Virahol is 1: (1 ~ 1.5); The add-on of described dispersion agent is 0.3% ~ 0.8% of mixed powder quality;
Step 3, tensio-active agent joined in the mixed powder after dispersion treatment described in step 2 mix, obtain the mixed powder after solubilising process; Described tensio-active agent is stearic acid, and the add-on of described tensio-active agent is 0.5% ~ 1.5% of the mixed powder quality after dispersion treatment;
Step 4, be soaked in dehydrated alcohol by the mixed powder after the process of solubilising described in step 3, being then placed in temperature is that the baking oven of 200 DEG C ~ 400 DEG C is dried, and obtains composite modified additive after naturally cooling;
Step 5, be heating and melting under the condition of 120 DEG C ~ 140 DEG C in temperature by matrix pitch, then composite modified additive described in step 4 is joined in the matrix pitch after melting, 160 DEG C ~ 180 DEG C are warming up to after stirring, adopt high-speed shearing machine to carry out shearing treatment to the matrix pitch after intensification, after naturally cooling, obtain composite modified asphalt; The mass ratio of described composite modified additive and matrix pitch is 1: (15 ~ 20), the detailed process of described shearing treatment is: by the matrix pitch first low velocity shear 3min ~ 10min under shearing rate is the condition of 600rpm ~ 1200rpm after heating up, then in shearing rate be 3000rpm ~ 5000rpm condition under high speed shear 30min ~ 50min.
The preparation method of above-mentioned a kind of composite modified asphalt, is characterized in that, the mass percent of the various breezes taken in step one is respectively: sillimanite powder 30% ~ 66.5%, andaluzite powder 31.9% ~ 68.6%, andesite powder 1% ~ 1.6%.
The preparation method of above-mentioned a kind of composite modified asphalt, is characterized in that, the mass percent of the various breezes taken in step one is respectively: sillimanite powder 59.4%, andaluzite powder 39.2%, andesite powder 1.4%.
The preparation method of above-mentioned a kind of composite modified asphalt, is characterized in that, the particle diameter of the powder of sillimanite described in step one, andaluzite powder and andesite powder is 37 μm ~ 212 μm.
The preparation method of above-mentioned a kind of composite modified asphalt, is characterized in that, in the aqueous isopropanol of stearylamide described in step 2, the mass ratio of stearylamide and Virahol is 1: 1.2.
The preparation method of above-mentioned a kind of composite modified asphalt, is characterized in that, the time of soaking described in step 4 is 40min ~ 60min.
The present invention compared with prior art has the following advantages:
1, composite modified asphalt of the present invention is formed through composite modified additive modification by matrix pitch, the main component of composite modified additive is sillimanite, andaluzite and andesite, wherein sillimanite and andaluzite have good flame retardant properties and resistance to elevated temperatures, the anti-alkaline matter corrodes of sillimanite is strong, andesite can strengthen the affinity of sillimanite and andaluzite and it can acid-resistance matter corrodes, adopt dispersion agent and tensio-active agent can improve the oleophylic of each breeze, wetting, adhesion property, therefore composite modified asphalt of the present invention has good dispersiveness, cementability and pavement performance, the corrosion of anti-acid and alkali substance can be reached in use, the effect of energy-conserving fire retardant.
2, the composite modified additive adopting the present invention to prepare has the effect of excellent flame-retardant smoke inhibition, acidproof anti-alkaline matter corrosion, can while the good pavement performance of guarantee through this additive agent modified composite modified asphalt, have flame retardant properties concurrently, anti-acid and alkali substance corrodes, there is satisfactory stability, fundamentally can improving the difficult problem that bituminous pavement is inflammable when there is traffic accident.
3, composite modified asphalt of the present invention adopts matrix pitch, sillimanite, andaluzite and andesite to be that starting material are made, and has anti acid alkali performance matter corrodes, satisfactory stability.
4, raw material sources of the present invention is extensive, and production process is pollution-free and cheap.
5, preparation technology of the present invention is simple, and cost is low, has good economic benefit.
Below in conjunction with embodiment, the present invention is described in further detail.
Embodiment
Embodiment 1
The preparation method of the present embodiment composite modified asphalt comprises the following steps:
Step one, take the various breezes of following mass percent: sillimanite powder 59.4%, andaluzite powder 39.2%, andesite powder 1.4%; Then the various breezes after taking are mixed, obtain mixed powder; The particle diameter of described sillimanite powder, andaluzite powder and andesite powder is 37 μm ~ 74 μm;
Step 2, dispersion agent joined in mixed powder described in step one mix, obtain the mixed powder after dispersion treatment; Described dispersion agent is the aqueous isopropanol of stearylamide, and in the aqueous isopropanol of described stearylamide, the mass ratio of stearylamide and Virahol is 1: 1.2; The add-on of described dispersion agent is 0.5% of mixed powder quality;
Step 3, tensio-active agent joined in the mixed powder after dispersion treatment described in step 2 mix, obtain the mixed powder after solubilising process; Described tensio-active agent is stearic acid, and the add-on of described tensio-active agent is 1.2% of the mixed powder quality after dispersion treatment;
Step 4, the mixed powder after the process of solubilising described in step 3 is soaked in 50min in dehydrated alcohol, being then placed in temperature is that the baking oven of 200 DEG C is dried, and obtains composite modified additive after naturally cooling;
Step 5, be heating and melting under the condition of 120 DEG C in temperature by matrix pitch, then composite modified additive described in step 4 is joined in the matrix pitch after melting, 160 DEG C are warming up to after stirring, adopt high-speed shearing machine to carry out shearing treatment to the matrix pitch after intensification, after naturally cooling, obtain composite modified asphalt; The mass ratio of described composite modified additive and matrix pitch is 1: 17, the detailed process of described shearing treatment is: by the matrix pitch first low velocity shear 7min under shearing rate is the condition of 800rpm after heating up, then in shearing rate be 4000rpm condition under high speed shear 40min.
Embodiment 2
The preparation method of the present embodiment composite modified asphalt comprises the following steps:
Step one, take the various breezes of following mass percent: sillimanite powder 23%, andaluzite powder 76.1%, andesite powder 0.9%; Then the various breezes after taking are mixed, obtain mixed powder; The particle diameter of described sillimanite powder, andaluzite powder and andesite powder is 61 μm ~ 165 μm;
Step 2, dispersion agent joined in mixed powder described in step one mix, obtain the mixed powder after dispersion treatment; Described dispersion agent is the aqueous isopropanol of stearylamide, and in the aqueous isopropanol of described stearylamide, the mass ratio of stearylamide and Virahol is 1: 1; The add-on of described dispersion agent is 0.8% of mixed powder quality;
Step 3, tensio-active agent joined in the mixed powder after dispersion treatment described in step 2 mix, obtain the mixed powder after solubilising process; Described tensio-active agent is stearic acid, and the add-on of described tensio-active agent is 0.5% of the mixed powder quality after dispersion treatment;
Step 4, the mixed powder after the process of solubilising described in step 3 is soaked in 60min in dehydrated alcohol, being then placed in temperature is that the baking oven of 300 DEG C is dried, and obtains composite modified additive after naturally cooling;
Step 5, be heating and melting under the condition of 130 DEG C in temperature by matrix pitch, then composite modified additive described in step 4 is joined in the matrix pitch after melting, 170 DEG C are warming up to after stirring, adopt high-speed shearing machine to carry out shearing treatment to the matrix pitch after intensification, after naturally cooling, obtain composite modified asphalt; The mass ratio of described composite modified additive and matrix pitch is 1: 15, the detailed process of described shearing treatment is: by the matrix pitch first low velocity shear 10min under shearing rate is the condition of 600rpm after heating up, then in shearing rate be 5000rpm condition under high speed shear 30min.
Embodiment 3
The preparation method of the present embodiment composite modified asphalt comprises the following steps:
Step one, take the various breezes of following mass percent: sillimanite powder 43%, andaluzite powder 56%, andesite powder 1%; Then the various breezes after taking are mixed, obtain mixed powder; The particle diameter of described sillimanite powder, andaluzite powder and andesite powder is 150 μm ~ 212 μm;
Step 2, dispersion agent joined in mixed powder described in step one mix, obtain the mixed powder after dispersion treatment; Described dispersion agent is the aqueous isopropanol of stearylamide, and in the aqueous isopropanol of described stearylamide, the mass ratio of stearylamide and Virahol is 1: 1.5; The add-on of described dispersion agent is 0.6% of mixed powder quality;
Step 3, tensio-active agent joined in the mixed powder after dispersion treatment described in step 2 mix, obtain the mixed powder after solubilising process; Described tensio-active agent is stearic acid, and the add-on of described tensio-active agent is 0.5% of the mixed powder quality after dispersion treatment;
Step 4, the mixed powder after the process of solubilising described in step 3 is soaked in 60min in dehydrated alcohol, being then placed in temperature is that the baking oven of 300 DEG C is dried, and obtains composite modified additive after naturally cooling;
Step 5, be heating and melting under the condition of 120 DEG C in temperature by matrix pitch, then composite modified additive described in step 4 is joined in the matrix pitch after melting, 160 DEG C are warming up to after stirring, adopt high-speed shearing machine to carry out shearing treatment to the matrix pitch after intensification, after naturally cooling, obtain composite modified asphalt; The mass ratio of described composite modified additive and matrix pitch is 1: 16, the detailed process of described shearing treatment is: by the matrix pitch first low velocity shear 10min under shearing rate is the condition of 1000rpm after heating up, then in shearing rate be 4000rpm condition under high speed shear 50min.
Embodiment 4
The preparation method of the present embodiment composite modified asphalt comprises the following steps:
Step one, take the various breezes of following mass percent: sillimanite powder 66.5%, andaluzite powder 31.9%, andesite powder 1.6%; Then the various breezes after taking are mixed, obtain mixed powder; The particle diameter of described sillimanite powder, andaluzite powder and andesite powder is 37 μm ~ 53 μm;
Step 2, dispersion agent joined in mixed powder described in step one mix, obtain the mixed powder after dispersion treatment; Described dispersion agent is the aqueous isopropanol of stearylamide, and in the aqueous isopropanol of described stearylamide, the mass ratio of stearylamide and Virahol is 1: 1.5; The add-on of described dispersion agent is 0.8% of mixed powder quality;
Step 3, tensio-active agent joined in the mixed powder after dispersion treatment described in step 2 mix, obtain the mixed powder after solubilising process; Described tensio-active agent is stearic acid, and the add-on of described tensio-active agent is 0.5% of the mixed powder quality after dispersion treatment;
Step 4, the mixed powder after the process of solubilising described in step 3 is soaked in 40min in dehydrated alcohol, being then placed in temperature is that the baking oven of 400 DEG C is dried, and obtains composite modified additive after naturally cooling;
Step 5, be heating and melting under the condition of 120 DEG C in temperature by matrix pitch, then composite modified additive described in step 4 is joined in the matrix pitch after melting, 180 DEG C are warming up to after stirring, adopt high-speed shearing machine to carry out shearing treatment to the matrix pitch after intensification, after naturally cooling, obtain composite modified asphalt; The mass ratio of described composite modified additive and matrix pitch is 1: 20, the detailed process of described shearing treatment is: by the matrix pitch first low velocity shear 3min under shearing rate is the condition of 1200rpm after heating up, then in shearing rate be 3000rpm condition under high speed shear 50min.
Embodiment 5
The preparation method of the present embodiment composite modified asphalt comprises the following steps:
Step one, take the various breezes of following mass percent: sillimanite powder 30%, andaluzite powder 68.6%, andesite powder 1.4%; Then the various breezes after taking are mixed, obtain mixed powder; The particle diameter of described sillimanite powder, andaluzite powder and andesite powder is 165 μm ~ 212 μm;
Step 2, dispersion agent joined in mixed powder described in step one mix, obtain the mixed powder after dispersion treatment; Described dispersion agent is the aqueous isopropanol of stearylamide, and in the aqueous isopropanol of described stearylamide, the mass ratio of stearylamide and Virahol is 1: 1.3; The add-on of described dispersion agent is 0.3% of mixed powder quality;
Step 3, tensio-active agent joined in the mixed powder after dispersion treatment described in step 2 mix, obtain the mixed powder after solubilising process; Described tensio-active agent is stearic acid, and the add-on of described tensio-active agent is 0.5% of the mixed powder quality after dispersion treatment;
Step 4, the mixed powder after the process of solubilising described in step 3 is soaked in 40min in dehydrated alcohol, being then placed in temperature is that the baking oven of 300 DEG C is dried, and obtains composite modified additive after naturally cooling;
Step 5, be heating and melting under the condition of 140 DEG C in temperature by matrix pitch, then composite modified additive described in step 4 is joined in the matrix pitch after melting, 180 DEG C are warming up to after stirring, adopt high-speed shearing machine to carry out shearing treatment to the matrix pitch after intensification, after naturally cooling, obtain composite modified asphalt; The mass ratio of described composite modified additive and matrix pitch is 1: 17, the detailed process of described shearing treatment is: by the matrix pitch first low velocity shear 10min under shearing rate is the condition of 600rpm after heating up, then in shearing rate be 5000rpm condition under high speed shear 30min.
Embodiment 6
The preparation method of the present embodiment composite modified asphalt comprises the following steps:
Step one, take the various breezes of following mass percent: sillimanite powder 55%, andaluzite powder 43.8%, andesite powder 1.2%; Then the various breezes after taking are mixed, obtain mixed powder; The particle diameter of described sillimanite powder, andaluzite powder and andesite powder is 83 μm ~ 198 μm;
Step 2, dispersion agent joined in mixed powder described in step one mix, obtain the mixed powder after dispersion treatment; Described dispersion agent is the aqueous isopropanol of stearylamide, and in the aqueous isopropanol of described stearylamide, the mass ratio of stearylamide and Virahol is 1: 1.5; The add-on of described dispersion agent is 0.8% of mixed powder quality;
Step 3, tensio-active agent joined in the mixed powder after dispersion treatment described in step 2 mix, obtain the mixed powder after solubilising process; Described tensio-active agent is stearic acid, and the add-on of described tensio-active agent is 0.8% of the mixed powder quality after dispersion treatment;
Step 4, the mixed powder after the process of solubilising described in step 3 is soaked in 45min in dehydrated alcohol, being then placed in temperature is that the baking oven of 400 DEG C is dried, and obtains composite modified additive after naturally cooling;
Step 5, be heating and melting under the condition of 140 DEG C in temperature by matrix pitch, then composite modified additive described in step 4 is joined in the matrix pitch after melting, 180 DEG C are warming up to after stirring, adopt high-speed shearing machine to carry out shearing treatment to the matrix pitch after intensification, after naturally cooling, obtain composite modified asphalt; The mass ratio of described composite modified additive and matrix pitch is 1: 18, the detailed process of described shearing treatment is: by the matrix pitch first low velocity shear 10min under shearing rate is the condition of 600rpm after heating up, then in shearing rate be 3000rpm condition under high speed shear 50min.
Embodiment 7
The preparation method of the present embodiment composite modified asphalt comprises the following steps:
Step one, take the various breezes of following mass percent: sillimanite powder 77.7%, andaluzite powder 21%, andesite powder 1.3%; Then the various breezes after taking are mixed, obtain mixed powder; The particle diameter of described sillimanite powder, andaluzite powder and andesite powder is 37 μm ~ 212 μm;
Step 2, dispersion agent joined in mixed powder described in step one mix, obtain the mixed powder after dispersion treatment; Described dispersion agent is the aqueous isopropanol of stearylamide, and in the aqueous isopropanol of described stearylamide, the mass ratio of stearylamide and Virahol is 1: 1.5; The add-on of described dispersion agent is 0.7% of mixed powder quality;
Step 3, tensio-active agent joined in the mixed powder after dispersion treatment described in step 2 mix, obtain the mixed powder after solubilising process; Described tensio-active agent is stearic acid, and the add-on of described tensio-active agent is 1.5% of the mixed powder quality after dispersion treatment;
Step 4, the mixed powder after the process of solubilising described in step 3 is soaked in 45min in dehydrated alcohol, being then placed in temperature is that the baking oven of 400 DEG C is dried, and obtains composite modified additive after naturally cooling;
Step 5, be heating and melting under the condition of 140 DEG C in temperature by matrix pitch, then composite modified additive described in step 4 is joined in the matrix pitch after melting, 170 DEG C are warming up to after stirring, adopt high-speed shearing machine to carry out shearing treatment to the matrix pitch after intensification, after naturally cooling, obtain composite modified asphalt; The mass ratio of described composite modified additive and matrix pitch is 1: 17.5, the detailed process of described shearing treatment is: by the matrix pitch first low velocity shear 9min under shearing rate is the condition of 900rpm after heating up, then in shearing rate be 4500rpm condition under high speed shear 35min.
Comparative example 1
The preparation method of this comparative example composite modified asphalt and the difference of embodiment 1 are only: without dispersion treatment and solubilising process.Concrete preparation technology is:
Step one, take the various breezes of following mass percent: sillimanite powder 77.7%, andaluzite powder 21%, andesite powder 1.3%; Then the various breezes after taking are mixed, obtain mixed powder; The particle diameter of described sillimanite powder, andaluzite powder and andesite powder is 37 μm ~ 74 μm;
Step 2, the mixed powder in step one is soaked in 50min in dehydrated alcohol, being then placed in temperature is that the baking oven of 200 DEG C is dried, and obtains composite modified additive after naturally cooling;
Step 3, be heating and melting under the condition of 120 DEG C in temperature by matrix pitch, then composite modified additive described in step 2 is joined in the matrix pitch after melting, 160 DEG C are warming up to after stirring, adopt high-speed shearing machine to carry out shearing treatment to the matrix pitch after intensification, after naturally cooling, obtain composite modified asphalt; The mass ratio of described composite modified additive and matrix pitch is 1: 17, the detailed process of described shearing treatment is: by the matrix pitch first low velocity shear 7min under shearing rate is the condition of 800rpm after heating up, then in shearing rate be 4000rpm condition under high speed shear 40min.
Comparative example 2
The preparation method of this comparative example composite modified asphalt and the difference of embodiment 1 are only: described additive is made up of traditional magnesium hydroxide powder, aluminium hydrate powder and silica powder.Concrete preparation technology is:
Step one, take the various breezes of following mass percent: magnesium hydroxide powder 77.7%, aluminium hydrate powder 21%, silica powder 1.3%; Then the various breezes after taking are mixed, obtain mixed powder; The particle diameter of described magnesium hydroxide powder, aluminium hydrate powder and silica powder is 37 μm ~ 74 μm;
Step 2, dispersion agent joined in mixed powder described in step one mix, obtain the mixed powder after dispersion treatment; Described dispersion agent is the aqueous isopropanol of stearylamide, and in the aqueous isopropanol of described stearylamide, the mass ratio of stearylamide and Virahol is 1: 1.2; The add-on of described dispersion agent is 0.5% of mixed powder quality;
Step 3, tensio-active agent joined in the mixed powder after dispersion treatment described in step 2 mix, obtain the mixed powder after solubilising process; Described tensio-active agent is stearic acid, and the add-on of described tensio-active agent is 1.2% of the mixed powder quality after dispersion treatment;
Step 4, the mixed powder after the process of solubilising described in step 3 is soaked in 50min in dehydrated alcohol, being then placed in temperature is that the baking oven of 200 DEG C is dried, and obtains composite modified additive after naturally cooling;
Step 5, be heating and melting under the condition of 120 DEG C in temperature by matrix pitch, then composite modified additive described in step 4 is joined in the matrix pitch after melting, 160 DEG C are warming up to after stirring, adopt high-speed shearing machine to carry out shearing treatment to the matrix pitch after intensification, after naturally cooling, obtain composite modified asphalt; The mass ratio of described composite modified additive and matrix pitch is 1: 17, the detailed process of described shearing treatment is: by the matrix pitch first low velocity shear 7min under shearing rate is the condition of 800rpm after heating up, then in shearing rate be 4000rpm condition under high speed shear 40min.
According to the relevant regulations of " highway engineering pitch and Asphalt Mixture Experiment code " (JTGE20-2011), respectively basic performance tests is carried out to embodiment of the present invention 1-7 and comparative example 1-2 composite modified asphalt.Regulation with reference to " Plastics Combustion method for testing performance-oxygen index method " (GB/T2408-2008) carries out oxygen index test, relevant regulations according to " material of construction burning or the smoke density grade test method of decomposing " (GB/T8627) carries out smoke density test, and the regulation with reference to " the fire scenario flue gas preparation method of material " (GA/T505) carries out flue gas toxity test.The concrete test-results of embodiment of the present invention 1-7 and comparative example 1-2 composite modified asphalt is as shown in table 1.
The experimental test result of table 1 composite modified asphalt
As shown in Table 1, embodiment of the present invention 1-7 is by carrying out component screening and dosage optimization to breeze, and by carrying out the dispersion treatment that is suitable for and solubilising process, the indexs such as the penetration degree of prepared composite modified asphalt, ductility, softening temperature are made all to meet the requirement of " People's Republic of China's petroleum chemical industry standard " (NB/SH/T0820-2010) and composite modified asphalt pavement performance, and oxygen index is greater than 23%, smoke density is less than 75, flue gas toxity grade is as the criterion safe one-level (ZA1), reaches the associated specifications of country to flame-retardant pitch material.
The above is only preferred embodiment of the present invention, not imposes any restrictions the present invention.Every above embodiment is done according to invention technical spirit any simple modification, change and equivalence change, all still belong in the protection domain of technical solution of the present invention.
Claims (5)
1. a preparation method for composite modified asphalt, is characterized in that, the method comprises the following steps:
Step one, take the various breezes of following mass percent: sillimanite powder 23% ~ 77.7%, andaluzite powder 21% ~ 76.1%, andesite powder 0.9% ~ 1.6%; Then the various breezes after taking are mixed, obtain mixed powder;
Step 2, dispersion agent joined in mixed powder described in step one mix, obtain the mixed powder after dispersion treatment; Described dispersion agent is the aqueous isopropanol of stearylamide, and in the aqueous isopropanol of described stearylamide, the mass ratio of stearylamide and Virahol is 1: (1 ~ 1.5); The add-on of described dispersion agent is 0.3% ~ 0.8% of mixed powder quality;
Step 3, tensio-active agent joined in the mixed powder after dispersion treatment described in step 2 mix, obtain the mixed powder after solubilising process; Described tensio-active agent is stearic acid, and the add-on of described tensio-active agent is 0.5% ~ 1.5% of the mixed powder quality after dispersion treatment;
Step 4, be soaked in dehydrated alcohol by the mixed powder after the process of solubilising described in step 3, being then placed in temperature is that the baking oven of 200 DEG C ~ 400 DEG C is dried, and obtains composite modified additive after naturally cooling;
Step 5, be heating and melting under the condition of 120 DEG C ~ 140 DEG C in temperature by matrix pitch, then composite modified additive described in step 4 is joined in the matrix pitch after melting, 160 DEG C ~ 180 DEG C are warming up to after stirring, adopt high-speed shearing machine to carry out shearing treatment to the matrix pitch after intensification, after naturally cooling, obtain composite modified asphalt; The mass ratio of described composite modified additive and matrix pitch is 1: (15 ~ 20), the detailed process of described shearing treatment is: by the matrix pitch first low velocity shear 3min ~ 10min under shearing rate is the condition of 600rpm ~ 1200rpm after heating up, then in shearing rate be 3000rpm ~ 5000rpm condition under high speed shear 30min ~ 50min.
2. the preparation method of a kind of composite modified asphalt according to claim 1, it is characterized in that, the mass percent of the various breezes taken in step one is respectively: sillimanite powder 30% ~ 66.5%, andaluzite powder 31.9% ~ 68.6%, andesite powder 1% ~ 1.6%.
3. the preparation method of a kind of composite modified asphalt according to claim 2, is characterized in that, the mass percent of the various breezes taken in step one is respectively: sillimanite powder 59.4%, andaluzite powder 39.2%, andesite powder 1.4%.
4. the preparation method of a kind of composite modified asphalt according to claim 1,2 or 3, is characterized in that, the particle diameter of the powder of sillimanite described in step one, andaluzite powder and andesite powder is 37 μm ~ 212 μm.
5. the preparation method of a kind of composite modified asphalt according to claim 1,2 or 3, is characterized in that, in the aqueous isopropanol of stearylamide described in step 2, the mass ratio of stearylamide and Virahol is 1: 1.2.
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| CN103044937A (en) * | 2013-01-12 | 2013-04-17 | 天津市市政工程设计研究院 | Flame-retardant smoke-suspension asphalt for environment-friendly road and preparation method of asphalt |
| CN103554931A (en) * | 2013-10-17 | 2014-02-05 | 王朝辉 | Modified asphalt with hot-mix emission reduction and flame-retardant smoke suppression functions |
| CN103819911A (en) * | 2014-01-23 | 2014-05-28 | 长安大学 | Composite asphalt modification additive, preparation method for same and additive-based asphalt modification method |
| CN103740121A (en) * | 2014-01-24 | 2014-04-23 | 长安大学 | Road modified asphalt |
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| CN104291737A (en) | 2015-01-21 |
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